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80 Commits

Author SHA1 Message Date
Andrew Tridgell 587fb58720 AP_AHRS: fixed license text 
APM is under GPL, not LGPL
 2013-08-30 13:01:32 +10:00
Andrew Tridgell 0d36832b82 AP_AHRS: use const reference not pointers for locations 
this makes life easier for the new AP_Mission library

Pair-Programmed-With: Brandon Jones <brnjones@gmail.com>
 2013-08-05 10:24:12 +10:00
Andrew Tridgell ec73fadc45 AP_AHRS: added true airspeed support in AHRS 
use true airspeed for wind calculations, and allow other drivers to
ask for the current ratio
 2013-07-22 12:50:01 +10:00
Randy Mackay 0325ad5d0d AP_AHRS: use rotateXY for speed 
Saves 0.1ms at 100hz
 2013-07-20 18:00:36 +09:00
Andrew Tridgell 086e8f80dc AP_AHRS: fixed spin rate gain conversion from degrees to radians 
fixes issue #433

Thanks Jurgen!
 2013-07-13 12:36:25 +10:00
Andrew Tridgell 279f6d00f0 AP_AHRS: changes for GPS field changes 2013-07-10 14:04:22 +10:00
tobias 1bf135b36f AP_AHRS: make some more functions const 2013-07-08 12:07:50 +10:00
Andrew Tridgell 7d42a0562d AP_AHRS: cope better with large GPS yaw changes 
this should cope better with bungee launches when using only GPS for
yaw.
 2013-06-25 12:44:26 +10:00
Andrew Tridgell 14628990e6 AP_AHRS: make wind estimation configurable 
rover doesn't want it
 2013-05-24 11:21:42 +10:00
Andrew Tridgell 6f1cee6406 AP_AHRS: fixed position estimate with 2D fix or low satellite count 
we should still use the GPS for position fixes when we have a low
number of satellites, but we should stop using it for velocity
estimates and attitude correction.
 2013-05-07 10:52:14 +10:00
Randy Mackay ceda7d26b0 AHRS: add correct_centrifugal and flags structure 2013-05-06 15:32:06 +09:00
Andrew Tridgell 38fc0e61c6 AP_AHRS: optimise yaw drift correction 
use new vector2 cross product, and factor out the z component of a dcm
mul_transpose() to reduce the number of floating point operations for
a yaw drift correction cycle
 2013-05-05 13:51:45 +10:00
Randy Mackay ee2daf25b6 AHRS: perf improvement by caching declination vector 2013-05-05 12:58:43 +10:00
Andrew Tridgell 943a1d8c8d AP_AHRS: added AHRS_GPS_MINSATS option 
if the number of visible satellites is below AHRS_GPS_MINSATS then
don't use the GPS for acceleration correction for attitude
 2013-05-05 12:48:01 +10:00
Andrew Tridgell ba83950fc4 libraries: replace constrain() with constrain_float() 
this makes the type much more obvious. Thanks to Tobias for the
suggestion.
 2013-05-02 10:25:40 +10:00
Andrew Tridgell f5d6fb6216 AP_AHRS: added _kp gain reduction for catapult launch 
this should reduce the tendency of aircraft to nose down hard on
initial launch at high g
 2013-04-28 14:47:59 +10:00
Andrew Tridgell fd2cd0d1c2 DCM: fixed formatting 2013-04-23 08:57:44 +10:00
jschall 610069e729 DCM: fixed airspeed bug 
we incorrectly went via the wind estimate when we had a working airspeed sensor
 2013-04-23 08:57:44 +10:00
Andrew Tridgell a4d25f5a82 AHRS: removed AHRS_BARO_USE option 
this option has caused users too much trouble. The vertical velocity
is too noisy from the baro
 2013-04-15 10:52:31 +10:00
Andrew Tridgell 8459da202c AP_AHRS: prevents compass flyaways for plane and rover 
this switches to the GPS for yaw if the compass has dragged us off by
more than 45 degrees from the GPS heading, and the wind speed is less
than 80% of the ground speed.
 2013-03-29 13:48:25 +11:00
Randy Mackay 24044dc0c4 AHRS: add support for GPS fix type 2D 2013-03-27 11:41:43 +09:00
James Bielman 5631f865b2 Update floating point calculations to use floats instead of doubles. 
- Allows use of hardware floating point on the Cortex-M4.
- Added "f" suffix to floating point literals.
- Call floating point versions of stdlib math functions.
 2013-01-16 13:52:01 +11:00
Andrew Tridgell 3ac3aeb1b1 AHRS: fixed build on ARM 2013-01-02 14:45:09 +11:00
rmackay9 1c08f176ea AP_AHRS: add get_accel_ef method to return earth frame accelerometer values for use in ArduCopter's inertial nav and accel based throttle 2013-01-02 09:11:25 +11:00
Andrew Tridgell ceb3f577d8 libraries: use new math functions 2012-12-20 14:53:22 +11:00
Andrew Tridgell 8b6ad6d559 SITL: removed SITL_debug() 
not needed any more
 2012-12-20 14:51:36 +11:00
Andrew Tridgell 5840ded767 AHRS: removed constrain() defines 2012-12-20 14:51:34 +11:00
Pat Hickey 9bf69d4e0d AP_AHRS: port to AP_HAL 2012-12-20 14:51:29 +11:00
Andrew Tridgell 8561f08b2f AP_AHRS: prevent a large delta_t from affecting DCM solution 
this should fix large changes in attitude directly after arming
ArduCopter
 2012-11-13 15:33:10 +11:00
rmackay9 83ae8e47be AP_AHRS: replace IMU with INS and add roll and pitch trim 2012-11-07 19:20:32 +09:00
Andrew Tridgell fe47990dab AP_AHRS: removed the 6 sats min 
this would put us into dead-reckoning mode
 2012-11-06 14:26:49 +11:00
Andrew Tridgell 6a24bdec05 AP_AHRS: require at least 6 satellites to use the GPS for velocity 
logs of a recent flight show the velocity estimate can be very poor if
the GPS can see 5 satellites or less
 2012-11-05 20:07:37 +11:00
Andrew Tridgell ea40432235 AP_AHRS: use GPS vertical velocity when available 2012-11-05 14:58:40 +11:00
Andrew Tridgell 00bf548f87 AHRS: limit wind speed estimate changes 
sudden yaw changes can cause bad wind estimates
 2012-10-11 11:51:24 +11:00
Andrew Tridgell ccf8ba3ce9 DCM: limit the contribution of the baro to vertical acceleration 
limit to a max of 0.5g
 2012-09-20 17:34:32 +10:00
Andrew Tridgell fba1692d69 AHRS: added AHRS_BARO_USE parameter 
allow disabling of the use of the barometer for vertical acceleration
compensation
 2012-09-12 14:42:04 +10:00
Andrew Tridgell de28cc8b28 AHRS: added AHRS_WIND_MAX option 
this allows APM to cope better with airspeed sensor failure, but
ensuring airspeed stays within AHRS_WIND_MAX of ground speed
 2012-09-08 11:37:07 +10:00
Andrew Tridgell 2be785899b AHRS: added airspeed_estimate() function 
this allows the APM code to use an airspeed estimate for navigation
 2012-08-25 17:49:26 +10:00
uncrustify 31a4442904 uncrustify libraries/AP_AHRS/AP_AHRS_DCM.cpp 2012-08-21 19:19:51 -07:00
Andrew Tridgell 134cd51d17 AHRS: moved var_info[] into top level AP_AHRS class 2012-08-21 15:58:09 +10:00
Andrew Tridgell ac72db8f00 AHRS: added set_fast_gains() method 
this will be used by arducopter on the ground
 2012-08-21 15:38:06 +10:00
Andrew Tridgell 14cdbd36cb AHRS: check for bad values in the error before they can affect DCM 
this should fix the DCM renorm errors in autotest, probably caused by
bad climb rates
 2012-08-18 13:54:11 +10:00
Andrew Tridgell d9cc967508 AHRS: force an extra read of the compass on startup 
the first read from the compass can be bad. This ensures we have a
good value when getting the initial AHRS yaw.

Thanks to Randy and Jason for the bug report!
 2012-08-17 17:57:39 +10:00
Andrew Tridgell 19a5d11669 AHRS: use airspeed for wind in forward flight 
when not turning we can use the airspeed sensor directly to calculate
the wind speed.
 2012-08-12 10:54:25 +10:00
Andrew Tridgell f5b7ae213c AHRS: added AHRS_GPS_USE parameter 
this allows for the GPS to be disables for position updates, which
allows for testing dead-reckoning
 2012-08-11 22:06:03 +10:00
Andrew Tridgell 779dacfd24 AHRS: added wind estimation code 
this allows us to estimate the wind while we have GPS lock, then use
that estimate in the long term dead reckoning
 2012-08-11 22:06:03 +10:00
Andrew Tridgell af4071894e AHRS: added long-term dead-reckoning 
this uses airspeed (if available) or last GPS ground speed to update
our position estimate in AHRS
 2012-08-11 12:00:31 +10:00
Andrew Tridgell 898a5af692 AP_Param: update AHRS for new constructor syntax 2012-08-08 12:11:57 +10:00
rmackay9 468170b589 AP_AHRS_DCM: moved var_info to belong to AP_AHRS_DCM instead of AP_AHRS 2012-07-28 14:16:15 +09:00
Jonathan Challinger 9cd98e79dd AHRS: normalise GA_b before computing error vector only if too large 
When GA_b is small the direction of the vector is unreliable, so
normalising can exacerbate the error in the direction
 2012-07-23 17:16:50 +10:00