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71 Commits

Author SHA1 Message Date
priseborough 04036d7777 AP_NavEKF : Updated GPS glitch protection logic 
This adds new functionality to the detection and compensation of GPS
glitches:

1) A maximum allowable innovation is calculated using the GPS noise
parameter multiplied by the gate, with an additional component allowing
for growth in position uncertainty due to acceleration error since
the last valid measurement
2) Includes per vehicle type values for the acceleration error limit
3) If the innovation length exceeds the maximum allowable, no fusion occurs
4) If no fusion has occurred for long enough such that the position uncertainty
exceeds the maximum set by a per vehicle parameter or a maximum time, an offset
is applied to the GPS data to so that it matches the value predicted by the filter
5) The offset is never allowed to be bigger than 100m
6) The offset is decayed to zero at a rate of 1.0 m/s to allow GPS jumps to
be accommodated gradually
7) The default velocity innovation gate has been tightened up for copter and rover
8) The variance data logging output has been updated to make it more useful
 2014-04-01 21:22:14 +11:00
priseborough 17cdac7bc8 AP_NavEKF : Clean up angle and mag field initialisation 
This path reduces duplicated code, eliminates unused variables and
causes the earth magnetic field states to be reset when exiting static mode
which will occur every time copter is armed. This enables copters to be
powered on and initialised inside vehicles or houses, without bad earth
field values affecting flight.
 2014-03-24 19:54:48 +11:00
Paul Riseborough f7007569d1 AP_NavEKF : Fix bug that limits copter sensor delay compensation to 125 
msec
 2014-03-21 21:52:20 +11:00
Paul Riseborough 35811758d7 AP_NavEKF : Update comments and remove un-used function declarations 2014-03-14 06:07:57 +11:00
Paul Riseborough 7b3130cfcc AP_NaVEKF : Enable operation without airspeed and compass 2014-03-10 21:53:09 +11:00
Paul Riseborough 3a5acb9cea AP_NavEKF : improved on-ground, in-air check and GPS yaw alignment 2014-03-10 14:07:34 +11:00
Paul Riseborough b47a11edf6 AP_NavEKF : improved static and on-ground mode selection logic 2014-03-10 04:39:59 +11:00
Paul Riseborough 2019708056 AP_NavEKF : Make all compass use autodetect 2014-03-09 19:59:19 +11:00
Paul Riseborough e485b246e7 AP_NavEKF : update comments 2014-03-09 19:59:18 +11:00
Paul Riseborough c8bd415b00 AP_NavEKF : Add sideslip constraint to allow plane flight without magnetometer 2014-03-09 19:59:17 +11:00
Paul Riseborough 52fabc822f AP_NavEKF : Add low speed magnetometer calibration option 2014-03-09 19:59:16 +11:00
Andrew Tridgell 449d09051e AP_NavEKF: cope with compass going offline while in flight 2014-03-02 14:32:10 +11:00
Paul Riseborough bd152d332c AP_NavEKF : Add accel aliasing protection 2014-03-02 08:10:04 +11:00
Paul Riseborough 5db9a87d31 AP_NavEKF : fixed bug in velocity rate of change filter 
This bug meant the velocity rate of change used to scale the GPS measurement variances was noisy and too small
 2014-02-23 19:50:37 +11:00
Paul Riseborough 89e0b48320 AP_NavEKF : Bug fix for height drift due to timer wrap-around 2014-02-23 19:50:35 +11:00
Andrew Tridgell 4e56196655 AP_NavEKF: allow states to be accessed using names as well as a Vector22 2014-02-21 20:24:47 +11:00
Andrew Tridgell c9d0c1face AP_NavEKF: use ahrs->get_armed() for static mode demanded 2014-02-19 10:52:57 +11:00
Andrew Tridgell 536160a3fb AP_NavEKF: use AHRS get_correct_centrifugal() 2014-02-19 10:28:45 +11:00
Andrew Tridgell 869e41fd03 AP_NavEKF: fixed detection of airspeed sensor 
the get_airspeed() AHRS call can change as the user enables/disables
the airspeed sensor, plus it only gets enabled after the NavEKF
constructor runs.
 2014-02-19 09:22:45 +11:00
Paul Riseborough 1ade39977a AP_NavEKF : covariance prediction cleanup 2014-02-19 09:22:45 +11:00
Paul Riseborough 8daca145d0 AP_NavEKF : useAirspeed set automatically 2014-02-19 09:22:45 +11:00
Paul Riseborough 6fbada26d3 AP_NavEKF : Improvements to staticMode robustness 2014-02-19 09:22:45 +11:00
Paul Riseborough b22dc706b2 AP_NavEKF : staticMode bugfix and robustness improvements 2014-02-16 21:04:55 +11:00
Paul Riseborough b56c8211c9 AP_NavEKF: Reduced number of Mavlink tuneable parameters 2014-02-15 05:48:23 +11:00
Paul Riseborough c20fac1269 AP_NavEKF: Updated comments for private functions 2014-02-15 05:48:23 +11:00
Paul Riseborough deb64c4cbd AP_NavEKF: Pos Vel reset after long GPS timeout 2014-02-15 05:48:23 +11:00
Paul Riseborough 80f6dba694 AP_NavEKF: Improved control of fusion update intervals 2014-02-15 05:48:23 +11:00
Paul Riseborough 13b9daeff5 AP_NavEKF: Added constraints to Mavlink tuneable parameters 2014-02-15 05:48:23 +11:00
Paul Riseborough b123e1bb16 AP_NavEKF: Improved in-air reset behaviour 2014-02-15 05:48:22 +11:00
Paul Riseborough 1651980b9f AP_NavEKF: Improved behaviour following loss and regaining of GPS 2014-02-15 05:48:22 +11:00
Paul Riseborough 14eb63e7c9 AP_NavEKF: Made most tuning parameters Mavlink adustable 2014-02-15 05:48:22 +11:00
Andrew Tridgell f800f5592d AP_NavEKF: fixup parameter handling 2014-02-15 05:48:22 +11:00
Paul Riseborough f0f76920fa AP_NavEKF : Mavlink tunable parameter - first attempt 2014-02-15 05:48:22 +11:00
Paul Riseborough 128f71157d AP_NavEKF: Fixed bug in pre GPS fix updates 2014-02-15 05:48:22 +11:00
Paul Riseborough 5219869389 AP_NavEKF : Added Z accel bias state and bootstrap initialisation method 2014-02-15 05:48:21 +11:00
Randy Mackay 7c73020015 AP_NavEKF: make params public so they can be tuned 2014-02-15 05:48:20 +11:00
Paul Riseborough 5c3dea28dc AP_NavEKF : Enable staticMode to be set externally 2014-02-15 05:48:20 +11:00
Paul Riseborough 2f3b2a7111 AP_NavEKF: second attempt at higher rate baro fusion 2014-02-15 05:48:19 +11:00
Paul Riseborough da2c341914 Revert "AP_NavEKF: Modifed Vel Pos fusion to fuse height data whenever baro reading has changed" 
This reverts commit d1e1be192a0e7ab0771edc9f2c03547da25697cf.
 2014-02-15 05:48:19 +11:00
Paul Riseborough 32cc427ff4 AP_NavEKF: Modifed Vel Pos fusion to fuse height data whenever baro reading has changed 2014-02-15 05:48:19 +11:00
Paul Riseborough 2998aa1a6a AP_NavEKF: Amended tuning parameter list, and changed from variance to noise definitions 2014-02-15 05:48:19 +11:00
Paul Riseborough 619fffec3e AP_NavEKF: added static mode for pre-arm and bench testing 2014-02-15 05:48:18 +11:00
Paul Riseborough d0831c708d AP_NavEKF : Added position and height reset public method 2014-02-15 05:48:18 +11:00
Andrew Tridgell 4c42f53636 AP_NavEKF: use INS delta_time 2014-02-15 05:48:17 +11:00
Paul Riseborough 6e6e3d923e AP_NavEKF: improved covariance matrix numerical stability protection 2014-02-15 05:48:16 +11:00
Andrew Tridgell 66dbaa6657 AP_NavEKF: make health() API const 2014-02-15 05:48:16 +11:00
Paul Riseborough 4a56ea84b5 AP_NavEKF: Removed accel bias states 2014-02-15 05:48:15 +11:00
Andrew Tridgell 2acf1e7ce5 AP_NavEKF: allow filter to run as single or double precision 
useful for checking if there are numerical precision issues
 2014-02-15 05:29:48 +11:00
Paul Riseborough efd444b02e AP_NavEKF: covariance protection (not enabled) and tuning changes for stability 2014-02-15 05:29:48 +11:00
Andrew Tridgell ee774f69d0 AP_NavEKF: fixed some time handling bugs 
use get_delta_time() and removed broken time wrap code
 2014-02-15 05:29:48 +11:00