Tom Pittenger
6 years ago
committed by
Tom Pittenger
6 changed files with 710 additions and 55 deletions
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/*
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This program is free software: you can redistribute it and/or modify |
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it under the terms of the GNU General Public License as published by |
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the Free Software Foundation, either version 3 of the License, or |
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(at your option) any later version. |
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This program is distributed in the hope that it will be useful, |
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but WITHOUT ANY WARRANTY; without even the implied warranty of |
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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GNU General Public License for more details. |
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You should have received a copy of the GNU General Public License |
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along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/ |
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#include "AP_OADatabase.h" |
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#if !HAL_MINIMIZE_FEATURES |
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#include <AP_AHRS/AP_AHRS.h> |
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#include <GCS_MAVLink/GCS.h> |
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#include <AP_Math/AP_Math.h> |
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extern const AP_HAL::HAL& hal; |
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#ifndef AP_OADATABASE_TIMEOUT_SECONDS_DEFAULT |
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#define AP_OADATABASE_TIMEOUT_SECONDS_DEFAULT 10 |
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#endif |
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#ifndef AP_OADATABASE_SIZE_DEFAULT |
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#define AP_OADATABASE_SIZE_DEFAULT 100 |
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#endif |
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#ifndef AP_OADATABASE_QUEUE_SIZE_DEFAULT |
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#define AP_OADATABASE_QUEUE_SIZE_DEFAULT 80 |
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#endif |
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const AP_Param::GroupInfo AP_OADatabase::var_info[] = { |
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// @Param: SIZE
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// @DisplayName: OADatabase maximum number of points
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// @Description: OADatabase maximum number of points. Set to 0 to disable the OA Database. Larger means more points but is more cpu intensive to process
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// @Range: 0 10000
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// @User: Advanced
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// @RebootRequired: True
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AP_GROUPINFO("SIZE", 1, AP_OADatabase, _database_size_param, AP_OADATABASE_SIZE_DEFAULT), |
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// @Param: EXPIRE
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// @DisplayName: OADatabase item timeout
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// @Description: OADatabase item timeout. The time an item will linger without any updates before it expires. Zero means never expires which is useful for a sent-once static environment but terrible for dynamic ones.
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// @Units: s
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// @Range: 0 127
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// @Increment: 1
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// @User: Advanced
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AP_GROUPINFO("EXPIRE", 2, AP_OADatabase, _database_expiry_seconds, AP_OADATABASE_TIMEOUT_SECONDS_DEFAULT), |
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// @Param: QUEUE_SIZE
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// @DisplayName: OADatabase queue maximum number of points
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// @Description: OADatabase queue maximum number of points. This in an input buffer size. Larger means it can handle larger bursts of incoming data points to filter into the database. No impact on cpu, only RAM. Recommend larger for faster datalinks or for sensors that generate a lot of data.
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// @Range: 1 200
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// @User: Advanced
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// @RebootRequired: True
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AP_GROUPINFO("QUEUE_SIZE", 3, AP_OADatabase, _queue_size_param, AP_OADATABASE_QUEUE_SIZE_DEFAULT), |
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// @Param: OUTPUT
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// @DisplayName: OADatabase output level
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// @Description: OADatabase output level to configure which database objects are sent to the ground station. All data is always available internally for avoidance algorithms.
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// @Values: 0:Disabled,1:Send only HIGH importance items,2:Send HIGH and NORMAL importance items,3:Send all items
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// @User: Advanced
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AP_GROUPINFO("OUTPUT", 4, AP_OADatabase, _output_level, (float)OA_DbOutputLevel::OUTPUT_LEVEL_SEND_HIGH), |
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AP_GROUPEND |
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}; |
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AP_OADatabase::AP_OADatabase() |
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{ |
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if (_singleton != nullptr) { |
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AP_HAL::panic("AP_OADatabase must be singleton"); |
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} |
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_singleton = this; |
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AP_Param::setup_object_defaults(this, var_info); |
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} |
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void AP_OADatabase::init() |
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{ |
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init_database(); |
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init_queue(); |
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if (!healthy()) { |
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gcs().send_text(MAV_SEVERITY_INFO, "DB init failed . Sizes queue:%u, db:%u", (unsigned int)_queue.size, (unsigned int)_database.size); |
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delete _queue.items; |
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delete[] _database.items; |
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return; |
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} |
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} |
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void AP_OADatabase::update() |
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{ |
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if (!healthy()) { |
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return; |
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} |
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process_queue(); |
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optimize_db_filter(); |
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database_items_remove_all_expired(); |
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} |
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// push a location into the database
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void AP_OADatabase::queue_push(const Location &loc, const uint32_t timestamp_ms, const float distance, const float angle) |
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{ |
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if (!healthy()) { |
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return; |
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} |
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AP_OADatabase::OA_DbItemImportance importance = AP_OADatabase::OA_DbItemImportance::Normal; |
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if (distance <= 0 || angle < 0 || angle > 360) { |
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// sanity check
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importance = AP_OADatabase::OA_DbItemImportance::Normal; |
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} else if (distance < 10 && (angle > (360-10) || angle < 10)) { |
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// far and directly in front +/- 10deg
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importance = AP_OADatabase::OA_DbItemImportance::High; |
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} else if (distance < 5 && (angle > (360-30) || angle < 30)) { |
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// kinda far and forward of us +/- 30deg
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importance = AP_OADatabase::OA_DbItemImportance::High; |
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} else if (distance < 3 && (angle > (360-90) || angle < 90)) { |
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// near and ahead +/- 90deg
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importance = AP_OADatabase::OA_DbItemImportance::High; |
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} else if (distance < 1.5) { |
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// very close anywhere
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importance = AP_OADatabase::OA_DbItemImportance::High; |
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} else if (distance >= 10) { |
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// really far away
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importance = AP_OADatabase::OA_DbItemImportance::Low; |
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} else if (distance < 5 && (angle <= (360-90) || angle >= 90)) { |
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// kinda far and behind us
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importance = AP_OADatabase::OA_DbItemImportance::Low; |
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} |
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const OA_DbItem item = {loc, timestamp_ms, 0, 0, importance}; |
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{ |
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WITH_SEMAPHORE(_queue.sem); |
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_queue.items->push(item); |
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} |
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} |
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void AP_OADatabase::init_queue() |
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{ |
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_queue.size = _queue_size_param; |
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if (_queue.size == 0) { |
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return; |
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} |
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_queue.items = new ObjectBuffer<OA_DbItem>(_queue.size); |
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} |
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void AP_OADatabase::init_database() |
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{ |
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_database.size = _database_size_param; |
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if (_database_size_param == 0) { |
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return; |
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} |
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_database.items = new OA_DbItem[_database.size]; |
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} |
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void AP_OADatabase::optimize_db_filter() |
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{ |
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// TODO: check database size and if we're getting full
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// we should grow the database size and/or increase
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// _database_filter_m so less objects go into it and let
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// the existing ones timeout naturally
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const float filter_m_backup = _database.filter_m; |
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if (_database.count > (_database.size * 0.90f)) { |
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// we're almost full, lets increase the filter size by requiring more
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// spacing between points so less things get put into the database
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_database.filter_m = MIN(_database.filter_m*_database.filter_grow_rate, _database.filter_max_m); |
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} else if (_database.count < (_database.size * 0.85f)) { |
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// we have some room, lets loosen the filter requirement (smaller object points) to allow more samples
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_database.filter_m = MAX(_database.filter_m*_database.filter_shrink_rate,_database.filter_min_m); |
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} |
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// recompute the the radius filters
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if (!is_equal(filter_m_backup,_database.filter_m)) { |
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_radius_importance_low = MIN(_database.filter_m*4,_database.filter_max_m); |
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_radius_importance_normal = _database.filter_m; |
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_radius_importance_high = MAX(_database.filter_m*0.25,_database.filter_min_m); |
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} |
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} |
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// get bitmask of gcs channels item should be sent to based on its importance
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// returns 0xFF (send to all channels) if should be sent, 0 if it should not be sent
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uint8_t AP_OADatabase::get_send_to_gcs_flags(const OA_DbItemImportance importance) |
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{ |
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switch (importance) { |
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case OA_DbItemImportance::Low: |
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if (_output_level.get() >= (int8_t)OA_DbOutputLevel::OUTPUT_LEVEL_SEND_ALL) { |
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return 0xFF; |
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} |
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break; |
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case OA_DbItemImportance::Normal: |
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if (_output_level.get() >= (int8_t)OA_DbOutputLevel::OUTPUT_LEVEL_SEND_HIGH_AND_NORMAL) { |
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return 0xFF; |
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} |
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break; |
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case OA_DbItemImportance::High: |
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if (_output_level.get() >= (int8_t)OA_DbOutputLevel::OUTPUT_LEVEL_SEND_HIGH) { |
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return 0xFF; |
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} |
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break; |
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} |
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return 0x0; |
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} |
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float AP_OADatabase::get_radius(const OA_DbItemImportance importance) |
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{ |
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switch (importance) { |
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case OA_DbItemImportance::Low: |
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return _radius_importance_low; |
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default: |
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case OA_DbItemImportance::Normal: |
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return _radius_importance_normal; |
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case OA_DbItemImportance::High: |
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return _radius_importance_high; |
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} |
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} |
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// returns true when there's more work inthe queue to do
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bool AP_OADatabase::process_queue() |
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{ |
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if (!healthy()) { |
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return false; |
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} |
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// processing queue by moving those entries into the database
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// Using a for with fixed size is better than while(!empty) because the
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// while could get us stuck here longer than expected if we're getting
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// a lot of values pushing into it while we're trying to empty it. With
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// the for we know we will exit at an expected time
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const uint16_t queue_available = MIN(_queue.items->available(), 100U); |
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if (queue_available == 0) { |
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return false; |
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} |
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for (uint16_t queue_index=0; queue_index<queue_available; queue_index++) { |
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OA_DbItem item; |
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bool pop_success; |
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{ |
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WITH_SEMAPHORE(_queue.sem); |
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pop_success = _queue.items->pop(item); |
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} |
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if (!pop_success) { |
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return false; |
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} |
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item.radius = get_radius(item.importance); |
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item.send_to_gcs = get_send_to_gcs_flags(item.importance); |
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// compare item to all items in database. If found a similar item, update the existing, else add it as a new one
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bool found = false; |
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for (uint16_t i=0; i<_database.count; i++) { |
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if (is_close_to_item_in_database(i, item)) { |
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database_item_refresh(i, item.timestamp_ms, item.radius); |
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found = true; |
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break; |
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} |
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} |
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if (!found) { |
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database_item_add(item); |
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} |
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} |
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return (_queue.items->available() > 0); |
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} |
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void AP_OADatabase::database_item_add(const OA_DbItem &item) |
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{ |
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if (_database.count >= _database.size) { |
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return; |
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} |
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_database.items[_database.count] = item; |
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_database.items[_database.count].send_to_gcs = get_send_to_gcs_flags(_database.items[_database.count].importance); |
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_database.count++; |
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} |
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void AP_OADatabase::database_item_remove(const uint16_t index) |
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{ |
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if (index >= _database.count || _database.count == 0) { |
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// index out of range
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return; |
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} |
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// radius of 0 tells the GCS we don't care about it any more (aka it expired)
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_database.items[index].radius = 0; |
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_database.items[index].send_to_gcs = get_send_to_gcs_flags(_database.items[index].importance); |
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_database.count--; |
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if (_database.count == 0) { |
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return; |
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} |
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if (index != _database.count) { |
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// copy last object in array over expired object
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_database.items[index] = _database.items[_database.count]; |
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_database.items[index].send_to_gcs = get_send_to_gcs_flags(_database.items[index].importance); |
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} |
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} |
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void AP_OADatabase::database_item_refresh(const uint16_t index, const uint32_t timestamp_ms, const float radius) |
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{ |
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if (index >= _database.count) { |
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// index out of range
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return; |
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} |
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const bool is_different = |
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(!is_equal(_database.items[index].radius, radius)) || |
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(timestamp_ms - _database.items[index].timestamp_ms >= 500); |
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if (is_different) { |
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// update timestamp and radius on close object so it stays around longer
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// and trigger resending to GCS
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_database.items[index].timestamp_ms = timestamp_ms; |
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_database.items[index].radius = radius; |
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_database.items[index].send_to_gcs = get_send_to_gcs_flags(_database.items[index].importance); |
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} |
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} |
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void AP_OADatabase::database_items_remove_all_expired() |
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{ |
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// calculate age of all items in the _database
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if (_database_expiry_seconds <= 0) { |
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// zero means never expire. This is not normal behavior but perhaps you could send a static
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// environment once that you don't want to have to constantly update
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return; |
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} |
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const uint32_t now_ms = AP_HAL::millis(); |
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const uint32_t expiry_ms = (uint32_t)_database_expiry_seconds * 1000; |
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uint16_t index = 0; |
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while (index < _database.count) { |
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if (now_ms - _database.items[index].timestamp_ms > expiry_ms) { |
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database_item_remove(index); |
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} else { |
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// overtime, the item radius will grow in size. If too big, remove it before the timer
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_database.items[index].radius *= _database.radius_grow_rate; |
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if (_database.items[index].radius >= _database.filter_max_m) { |
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database_item_remove(index); |
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} else { |
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index++; |
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} |
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} |
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} |
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} |
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// returns true if a similar object already exists in database. When true, the object timer is also reset
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bool AP_OADatabase::is_close_to_item_in_database(const uint16_t index, const OA_DbItem &item) const |
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{ |
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if (index >= _database.count) { |
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// index out of range
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return false; |
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} |
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return (_database.items[index].loc.get_distance(item.loc) < item.radius); |
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} |
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// send ADSB_VEHICLE mavlink messages
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void AP_OADatabase::send_adsb_vehicle(mavlink_channel_t chan, uint16_t interval_ms) |
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{ |
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// ensure database's send_to_gcs field is large enough
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static_assert(MAVLINK_COMM_NUM_BUFFERS <= sizeof(OA_DbItem::send_to_gcs) * 8, |
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"AP_OADatabase's OA_DBItem.send_to_gcs bitmask must be large enough to hold MAVLINK_COMM_NUM_BUFFERS"); |
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if ((_output_level.get() <= (int8_t)OA_DbOutputLevel::OUTPUT_LEVEL_DISABLED) || !healthy() || (chan >= MAVLINK_COMM_NUM_BUFFERS)) { |
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return; |
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} |
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const uint8_t chan_as_bitmask = 1 << chan; |
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const char callsign[9] = "OA_DB"; |
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// calculate how many messages we should send
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const uint32_t now_ms = AP_HAL::millis(); |
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uint16_t num_to_send = 1; |
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uint16_t num_sent = 0; |
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if ((_last_send_to_gcs_ms[chan] != 0) && (interval_ms > 0)) { |
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uint32_t diff_ms = now_ms - _last_send_to_gcs_ms[chan]; |
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num_to_send = MAX(diff_ms / interval_ms, 1U); |
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} |
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_last_send_to_gcs_ms[chan] = now_ms; |
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// send unsent objects until output buffer is full or have sent enough
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for (uint16_t i=0; i < _database.count; i++) { |
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if (!HAVE_PAYLOAD_SPACE(chan, ADSB_VEHICLE) || (num_sent >= num_to_send)) { |
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// all done for now
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return; |
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} |
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const uint16_t idx = _next_index_to_send[chan]; |
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// prepare to send next object
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_next_index_to_send[chan]++; |
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if (_next_index_to_send[chan] >= _database.count) { |
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_next_index_to_send[chan] = 0; |
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} |
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if ((_database.items[idx].send_to_gcs & chan_as_bitmask) == 0) { |
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continue; |
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} |
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mavlink_msg_adsb_vehicle_send(chan, |
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idx, |
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_database.items[idx].loc.lat, |
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_database.items[idx].loc.lng, |
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0, // altitude_type
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_database.items[idx].loc.alt, |
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0, // heading
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0, // hor_velocity
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0, // ver_velocity
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callsign, // callsign
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255, // emitter_type
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0, // tslc
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0, // flags
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(uint16_t)(_database.items[idx].radius * 100.f)); // squawk
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// unmark item for sending to gcs
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_database.items[idx].send_to_gcs &= ~chan_as_bitmask; |
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// update highest index sent to GCS
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_highest_index_sent[chan] = MAX(idx, _highest_index_sent[chan]); |
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// update count sent
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num_sent++; |
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} |
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// clear expired items in case the database size shrank
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while (_highest_index_sent[chan] > _database.count) { |
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if (!HAVE_PAYLOAD_SPACE(chan, ADSB_VEHICLE) || (num_sent >= num_to_send)) { |
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// all done for now
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return; |
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} |
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const uint16_t idx = _highest_index_sent[chan]; |
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_highest_index_sent[chan]--; |
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if (_database.items[idx].importance != OA_DbItemImportance::High) { |
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continue; |
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} |
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mavlink_msg_adsb_vehicle_send(chan, |
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idx, // id
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0, // latitude
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0, // longitude
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0, // altitude_type
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0, // altitude
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0, // heading
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0, // hor_velocity
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0, // ver_velocity
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callsign, // callsign
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255, // emitter_type
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0, // tslc
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0, // flags
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0); // squawk
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// update count sent
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num_sent++; |
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} |
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} |
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// singleton instance
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AP_OADatabase *AP_OADatabase::_singleton; |
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#endif //!HAL_MINIMIZE_FEATURES
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namespace AP { |
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AP_OADatabase *oadatabase() |
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{ |
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return AP_OADatabase::get_singleton(); |
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} |
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} |
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@ -0,0 +1,144 @@
@@ -0,0 +1,144 @@
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#pragma once |
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#include <AP_HAL/AP_HAL.h> |
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#include <AP_Common/Location.h> |
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#include <GCS_MAVLink/GCS_MAVLink.h> |
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|
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#if !HAL_MINIMIZE_FEATURES |
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#include <AP_Param/AP_Param.h> |
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|
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class AP_OADatabase { |
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public: |
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|
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AP_OADatabase(); |
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|
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/* Do not allow copies */ |
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AP_OADatabase(const AP_OADatabase &other) = delete; |
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AP_OADatabase &operator=(const AP_OADatabase&) = delete; |
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|
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// get singleton instance
|
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static AP_OADatabase *get_singleton() { |
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return _singleton; |
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} |
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|
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enum OA_DbItemImportance { |
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Low, Normal, High |
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}; |
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|
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struct OA_DbItem { |
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Location loc; // location of object. TODO: turn this into Vector2Int to save memory
|
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uint32_t timestamp_ms; // system time that object was last updated
|
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float radius; // objects radius in meters
|
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uint8_t send_to_gcs; // bitmask of mavlink comports to which details of this object should be sent
|
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OA_DbItemImportance importance; |
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}; |
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|
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void init(); |
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void update(); |
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|
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// push a location into the database
|
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void queue_push(const Location &loc, const uint32_t timestamp_ms, const float distance, const float angle); |
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|
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// returns true if database is healthy
|
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bool healthy() const { return (_queue.items != nullptr) && (_database.items != nullptr); } |
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|
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// fetch an item in database. Undefined result when i >= _database.count.
|
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const OA_DbItem& get_item(uint32_t i) const { return _database.items[i]; } |
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|
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// get radius (in meters) of objects in database
|
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float get_accuracy() const { return _database.filter_m; } |
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|
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// get number of items in the database
|
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uint16_t database_count() const { return _database.count; } |
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|
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// empty queue and try and put into database. Return true if there's more work to do
|
||||
bool process_queue(); |
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|
||||
// send ADSB_VEHICLE mavlink messages
|
||||
void send_adsb_vehicle(mavlink_channel_t chan, uint16_t interval_ms); |
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|
||||
static const struct AP_Param::GroupInfo var_info[]; |
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|
||||
private: |
||||
|
||||
// initialise
|
||||
void init_queue(); |
||||
void init_database(); |
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|
||||
// check queue and database sizes and adjust filter criteria to optimize use
|
||||
void optimize_db_filter(); |
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|
||||
// database item management
|
||||
void database_item_add(const OA_DbItem &item); |
||||
void database_item_refresh(const uint16_t index, const uint32_t timestamp_ms, const float radius); |
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void database_item_remove(const uint16_t index); |
||||
void database_items_remove_all_expired(); |
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|
||||
// get bitmask of gcs channels item should be sent to based on its importance
|
||||
// returns 0xFF (send to all channels) if should be sent or 0 if it should not be sent
|
||||
uint8_t get_send_to_gcs_flags(const OA_DbItemImportance importance); |
||||
|
||||
// used to determine the filter radius
|
||||
float get_radius(const OA_DbItemImportance importance); |
||||
|
||||
// returns true if database item "index" is close to "item"
|
||||
bool is_close_to_item_in_database(const uint16_t index, const OA_DbItem &item) const; |
||||
|
||||
// enum for use with _OUTPUT parameter
|
||||
enum class OA_DbOutputLevel { |
||||
OUTPUT_LEVEL_DISABLED = 0, |
||||
OUTPUT_LEVEL_SEND_HIGH = 1, |
||||
OUTPUT_LEVEL_SEND_HIGH_AND_NORMAL = 2, |
||||
OUTPUT_LEVEL_SEND_ALL = 3 |
||||
}; |
||||
|
||||
// parameters
|
||||
AP_Int16 _queue_size_param; // queue size
|
||||
AP_Int16 _database_size_param; // db size
|
||||
AP_Int8 _database_expiry_seconds; // objects expire after this timeout
|
||||
AP_Int8 _output_level; // controls which items should be sent to GCS
|
||||
|
||||
struct { |
||||
ObjectBuffer<OA_DbItem> *items; // thread safe incoming queue of points from proximity sensor to be put into database
|
||||
uint16_t size; // cached value of _queue_size_param.
|
||||
HAL_Semaphore sem; // semaphore for multi-thread use of queue
|
||||
} _queue; |
||||
|
||||
struct { |
||||
OA_DbItem *items; // array of objects in the database
|
||||
float filter_m = 0.2f; // object avoidance database optimization level radius. Min distance between each fence point. Larger means lower resolution
|
||||
const float filter_max_m = 10.0f; // filter value max size allowed to grow to
|
||||
const float filter_min_m = 0.011f; // worst case resolution of int32 lat/lng value at equator is 1.1cm;
|
||||
const float filter_grow_rate = 1.03f; // db filter how fast you grow to reduce items getting into dB
|
||||
const float filter_shrink_rate = 0.99f; // db filter how fast you shrink to increase items getting into dB
|
||||
const float radius_grow_rate = 1.10f; // db item radius growth over time. Resets if refreshed, otherwise decaying items grow
|
||||
uint16_t count; // number of objects in the items array
|
||||
uint16_t size; // cached value of _database_size_param that sticks after initialized
|
||||
} _database; |
||||
|
||||
uint16_t _next_index_to_send[MAVLINK_COMM_NUM_BUFFERS]; // index of next object in _database to send to GCS
|
||||
uint16_t _highest_index_sent[MAVLINK_COMM_NUM_BUFFERS]; // highest index in _database sent to GCS
|
||||
uint32_t _last_send_to_gcs_ms[MAVLINK_COMM_NUM_BUFFERS];// system time that send_adsb_vehicle was last called
|
||||
|
||||
float _radius_importance_low = _database.filter_m; |
||||
float _radius_importance_normal = _database.filter_m; |
||||
float _radius_importance_high = _database.filter_m; |
||||
|
||||
static AP_OADatabase *_singleton; |
||||
}; |
||||
#else |
||||
class AP_OADatabase { |
||||
public: |
||||
static AP_OADatabase *get_singleton() { return nullptr; } |
||||
void init() {}; |
||||
void queue_push(const Location &loc, const uint32_t timestamp_ms, const float distance, const float angle) {}; |
||||
bool healthy() const { return false; } |
||||
void send_adsb_vehicle(mavlink_channel_t chan, uint16_t interval_ms) {}; |
||||
}; |
||||
#endif // #if !HAL_MINIMIZE_FEATURES
|
||||
|
||||
namespace AP { |
||||
AP_OADatabase *oadatabase(); |
||||
}; |
||||
|
||||
|
||||
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Reference in new issue