this changes yaw handling in a few ways:
- GPS yaw now has a timestamp associated with the yaw separate from
the timestamp associated with the GPS fix
- we no longer force the primary to change to the UBLOX MB rover when
it has a GPS yaw. This means we don't change GPS primary due to GPS
loss, which keeps the GPS more stable. It also increases accuracy
as the rover is always less accurate in position and velocity than
the base
- now we force the primary to be the MB base if the other GPS is a
rover and the base has GPS lock
this changes the use of longitude_scale() to use the average latitude
instead of the lattitude at one end of the line when calculating
positions and distances. It means we obey the basic geometry rule
that:
pos1 + offs = pos2
pos2 - offs == pos1
The 100Hz update rate means there is a significant chance of an arming
failure after mission upload if you try to arm shortly after the
update.
Each mission item is 15 bytes, so with a 1200 item mission we need to
write 18000 bytes to storage. At 100Hz, with 8 bytes per storage line,
that takes over 22 seconds.
this processes GPS yaw with its own timestamp and as a separated step
from fusing position and velocity. This makes the yaw time handling
more accurate as yaw for moving baseline GPS comes in as a separate
piece of data from the position and velocity
this shifts EKF_origin to the current location at 1Hz, while leaving
public_origin alone. All output APIs and logging are relative to
public_origin.
The effect of this change is to remove the distortion caused by a
spherical earth, which allows the EKF to operate without errors at
very long distances from the public_origin.
Leonard Hall
Randy Mackay
Andy Piper
Hwurzburg
Andrew Tridgell
Peter Barker