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497 Commits

Author SHA1 Message Date
Andrew Tridgell 514c349060 AP_NavEKF: raise DCM error_rp threshold to 0.05 
it was failing on many boards with fixed wing
 2015-04-28 14:07:39 +10:00
Randy Mackay fdf226ebc1 AP_NavEKF: include AP_RangeFinder.h 2015-04-24 15:49:11 +09:00
Tom Pittenger a340d13d01 NavEKF: fix compile warning re member init order 2015-04-24 14:14:12 +09:00
Tom Pittenger d6b34209b5 NavEKF: fix compile warnings re float constants 2015-04-24 14:04:02 +09:00
Randy Mackay b05bdd657d AP_NavEKF: getHeightControlLimit modifies height on success 2015-04-24 10:58:05 +09:00
Paul Riseborough cf04600710 AP_NavEKF: Add public function to limit height control during OF nav 2015-04-24 10:57:56 +09:00
Paul Riseborough 68b225de4d AP_NavEKF: Prevent pre-arm baro drift affecting mag field reset height 2015-04-24 10:57:54 +09:00
Paul Riseborough c2e6fdb56c AP_NavEKF: Reduce effect of noisy baro data on baro height offset estimate 
This estimate is used to offset baro data if we need to switch across from range finder data due to sensor failure. The previous filter coefficients gave a 0.5 seconds time constant on the offset which was too susceptible to baro noise.
 2015-04-24 10:57:51 +09:00
Paul Riseborough fd7fdc1ad9 AP_NavEKF: Remove unnecessary state resets on arm and disarm 
Resetting states unnecessarily creates transients due to presence of bias errors
 2015-04-24 10:57:49 +09:00
Paul Riseborough 3e67080002 AP_NavEKF: Use GPS vertical velocity observations to estimate Z accel bias 2015-04-24 10:57:47 +09:00
Paul Riseborough e48171ab11 AP_NavEKF: Improve takeoff with optical flow and range data loss 
Range finder and optical flow data can drop-out and be reliable very close to ground. these patches enable the takeoff to be more relaibly detected and constrain optical flow navigation drift in the first part of takeoff.
 2015-04-24 10:57:45 +09:00
Paul Riseborough 3e061b174e AP_NavEKF: Report unhealthy for all filter faults 2015-04-24 10:57:43 +09:00
Paul Riseborough 6c4c54c2ba AP_NavEKF: Use default on ground range parameter from range finder object 2015-04-24 10:57:41 +09:00
Jonathan Challinger 10476333d8 AP_NavEKF: don't run when previously disarmed and time has slipped 2015-04-24 10:57:39 +09:00
Jonathan Challinger 085faaac6a AP_NavEKF: fix delay detection so that filter properly resets after a delay 2015-04-24 10:57:36 +09:00
Paul Riseborough 1c8e3f9444 AP_NavEKF: Allow EKF to pull data from range finder object 2015-04-24 10:57:01 +09:00
Paul Riseborough 4a5bf0a266 AP_NavEKF: Reduce EKF start time 
Makes EKF start conditional on DCM solution tilt error
 2015-04-23 20:35:48 +09:00
Arthur Benemann e59c6ddbae AP_SmallEKF: increase start-up time of the SmallEKF 2015-04-21 21:45:51 +09:00
Arthur Benemann 4ad3e786a5 AP_NavEKF: fix initialization of the SmallEKF 
The constructor 'states' variable was not being called. To make sure other variables where also zeroed now
 2015-04-21 21:45:36 +09:00
Arthur Benemann 1d9beed42f AP_SmallEKF: add function to report if the EKF is stable 2015-04-21 21:45:29 +09:00
Arthur Benemann 7b28bf7d44 AP_NavEKF: Remove small EKF dependency on navigation EKF 2015-04-21 21:45:28 +09:00
Andrew Tridgell 4586de6637 AP_NavEKF: enable optimisation in Linux build 
only really need debugging for SITL
 2015-04-16 08:36:16 +10:00
Paul Riseborough dffa2e19bf AP_NavEKF: Make copter glitch accel consistent with timeout and radius 2015-04-15 17:32:48 +09:00
Paul Riseborough 5d70854c08 AP_NavEKF: Fix minor bug in calculation of innovation variance 
the innovation variance for GPS should be the sum of squares of the state and measurement uncertainty.
 2015-04-15 17:32:46 +09:00
Paul Riseborough 1008c6390c AP_NavEKF: Fail absolute position status if GPS repeatedly rejected 2015-04-15 17:32:44 +09:00
Paul Riseborough 77d3798278 AP_NavEKF: Reduce recovery time after a GPS fusion timeout 2015-04-15 17:32:41 +09:00
Paul Riseborough 0852aeab6e AP_NavEKF: Allow raw innovations to be monitored during timeouts 2015-04-15 17:32:39 +09:00
Paul Riseborough d3f4b4a02b AP_NavEKF: Fix name consistency for data check time stamps 2015-04-15 17:32:36 +09:00
Paul Riseborough e79ccf1fcc AP_NavEKF: Fix bug allowing terrain to be above vehicle position 
The terrain state and vehicle state need to be compared at the same time horizon.
 2015-04-11 15:51:08 +09:00
Paul Riseborough 6d58c63c4c AP_NavEKF: Prevent potential divide by zeros in OF fusion 2015-04-11 15:51:03 +09:00
Paul Riseborough 89142f1c5f AP_NavEKF: Prevent inadvertent use of DCM roll and pitch estimates. 
the use of roll and pitch from the AHRS object is bad because that object could be returning estimates from the backup DCM algorithm.
 2015-04-11 15:19:05 +09:00
Paul Riseborough 9268024094 AP_NavEKF: Update default parameters for copter optical flow fusion 2015-04-10 11:08:11 +09:00
Paul Riseborough 4fbdab27ff AP_NavEKF: Use range finder for primary hgt ref in opt flow mode 
Falls back to baro if range finder is unavailable
Adds parameter enabling user to select which height source (baro or range finder) will be used during optical flow nav.
 2015-04-10 11:08:07 +09:00
Paul Riseborough d618c55e2f AP_NavEKF: Improved handling of noisy GPS speed accuracy data 2015-04-10 11:07:34 +09:00
Paul Riseborough e98edaa6cb AP_NavEKF: Return more accurate validity status for height above ground 2015-04-10 11:07:24 +09:00
Paul Riseborough 586e4a7d2b AP_NavEKF: Add Matlab derivations and simulations behind small EKF 2015-04-10 11:07:21 +09:00
Paul Riseborough c57e25142c AP_NavEKF: Update optical flow fusion maths to reduce height errors 2015-04-07 20:51:18 -07:00
myly10 55befdc345 AP_NavEKF: Typo correction for EAS_NOISE description 2015-04-06 15:52:29 -07:00
Paul Riseborough 9b3656e77c AP_NavEKF: Fix bug introduced in Y axis flow fusion 2015-04-05 21:17:20 -07:00
Andrew Tridgell baf292def1 AP_NavEKF: prevent float exception on startup 2015-04-05 09:16:14 -07:00
Paul Riseborough 7fc0f026d2 AP_NavEKF: Fix bug in optical flow innovation variance integrity check 
The check allowed negative innovation variances to pass. If this did occur, the filter would diverge.
 2015-04-04 17:03:06 -07:00
Andrew Tridgell c1a0375562 AP_NavEKF: prevent divide by zero in EKF logging 2015-04-04 07:09:02 -07:00
Paul Riseborough 10f050c53b AP_NavEKF: Prevent baro drift causing toilet bowling 
The magnetic field states are reset once at 1.5 metres and again at 5 metres. This height check was using the height at the first arm event as the reference. In the situation where there is baro drift and extgended time between the first arm event and flight, this can cause the magnetic field state to be reset when on the ground. If this happens when flying off a metallic surface, the resultant heading errors can cause sever toilet bowling.
 2015-04-03 15:18:42 -07:00
Paul Riseborough d4c60ca956 AP_NavEKF: Fix bug preventing reset of velocity after OF fusion timeout 2015-04-03 15:18:39 -07:00
Jonathan Challinger 95cd3480ec AP_NavEKF: review all uses of dtIMU and use dtIMUactual where necessary 
pair-programmed-with: Paul Riseborough <p_riseborough@live.com.au>
 2015-04-03 15:18:09 -07:00
Andrew Tridgell 79b44d3988 AP_NavEKF: initialise gndEffectMode 2015-04-03 15:15:11 -07:00
Andrew Tridgell 3165c43dfe AP_NavEKF: initialise gpsSpdAccuracy 2015-04-03 15:15:11 -07:00
Paul Riseborough 98c32012fa AP_NavEKF: remove accel bias rate limit when disarmed 2015-04-03 15:15:11 -07:00
Paul Riseborough fe76cb4c0b AP_NavEKF : Make initial height variance consistent with baro noise 
This makes sense to do because we initialise the state to the instantaneous baro reading
 2015-04-03 15:15:11 -07:00
Paul Riseborough a976e9dad2 AP_NavEKF : Fix bug in scaling of initial Z accel bias state variance 2015-04-03 15:15:11 -07:00