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86 lines
3.3 KiB
86 lines
3.3 KiB
/**************************************************************************** |
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* |
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* Copyright (C) 2012-2013 PX4 Development Team. All rights reserved. |
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* Author: Lorenz Meier <lm@inf.ethz.ch> |
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* |
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* Redistribution and use in source and binary forms, with or without |
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* modification, are permitted provided that the following conditions |
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* are met: |
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* |
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* 1. Redistributions of source code must retain the above copyright |
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* notice, this list of conditions and the following disclaimer. |
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* 2. Redistributions in binary form must reproduce the above copyright |
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* notice, this list of conditions and the following disclaimer in |
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* the documentation and/or other materials provided with the |
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* distribution. |
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* 3. Neither the name PX4 nor the names of its contributors may be |
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* used to endorse or promote products derived from this software |
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* without specific prior written permission. |
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* |
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS |
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT |
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS |
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* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE |
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* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, |
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, |
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* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS |
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* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED |
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* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT |
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN |
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* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE |
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* POSSIBILITY OF SUCH DAMAGE. |
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* |
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****************************************************************************/ |
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/** |
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* @file airspeed.c |
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* Airspeed estimation |
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* |
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* @author Lorenz Meier <lm@inf.ethz.ch> |
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* |
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*/ |
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#include "math.h" |
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#include "conversions.h" |
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__BEGIN_DECLS |
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/** |
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* Calculate indicated airspeed. |
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* |
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* Note that the indicated airspeed is not the true airspeed because it |
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* lacks the air density compensation. Use the calc_true_airspeed functions to get |
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* the true airspeed. |
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* |
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* @param pressure_front pressure inside the pitot/prandl tube |
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* @param pressure_ambient pressure at the side of the tube/airplane |
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* @param temperature air temperature in degrees celcius |
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* @return indicated airspeed in m/s |
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*/ |
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__EXPORT float calc_indicated_airspeed(float pressure_front, float pressure_ambient, float temperature); |
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/** |
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* Calculate true airspeed from indicated airspeed. |
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* |
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* Note that the true airspeed is NOT the groundspeed, because of the effects of wind |
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* |
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* @param speed current indicated airspeed |
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* @param pressure_ambient pressure at the side of the tube/airplane |
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* @param temperature air temperature in degrees celcius |
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* @return true airspeed in m/s |
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*/ |
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__EXPORT float calc_true_airspeed_from_indicated(float speed, float pressure_ambient, float temperature); |
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/** |
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* Directly calculate true airspeed |
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* |
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* Note that the true airspeed is NOT the groundspeed, because of the effects of wind |
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* |
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* @param pressure_front pressure inside the pitot/prandl tube |
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* @param pressure_ambient pressure at the side of the tube/airplane |
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* @param temperature air temperature in degrees celcius |
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* @return true airspeed in m/s |
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*/ |
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__EXPORT float calc_true_airspeed(float pressure_front, float pressure_ambient, float temperature); |
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__END_DECLS |