44852276da
AHRS: added ahrs.yaw_initialised()
...
this allows the high level code to know if the AHRS driver has a
reliable yaw estimate
2012-08-15 12:39:34 +10:00
562069cbd7
AHRS: avoid a compiler bug in quaternion code
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Having _wind in the AP_AHRS class causes a register allocation error
when building the Quaternion code with some versions of avr-gcc. Quite
bizarre.
2012-08-13 11:08:10 +10:00
fa1b72adc5
AHRS: use airspeed for wind in forward flight
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when not turning we can use the airspeed sensor directly to calculate
the wind speed.
2012-08-12 10:54:25 +10:00
3a92509b18
AHRS: added AHRS_GPS_USE parameter
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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
2c7ab7c659
AHRS: added wind estimation code
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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
708280511c
AHRS: added long-term dead-reckoning
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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
e48b0f8558
AHRS: make airspeed sensor available to AHRS
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this will be used for long term dead-reckoning
2012-08-11 08:57:32 +10:00
d3cc6e5fab
ACM: fixed HIL build
2012-08-11 08:34:16 +10:00
4e001286a6
AHRS DCM: FOrmatting
2012-08-09 16:59:43 -07:00
7be604cffd
AP_Param: update AHRS for new constructor syntax
2012-08-08 12:11:57 +10:00
9a558be53e
AP_AHRS_MPU6000: cleaning up compiler warning due to unused yaw_deltat variable
2012-07-28 16:23:25 +09:00
a49454e905
AP_AHRS: updated test sketch to allow use of MPU6000's DMP
2012-07-28 14:27:26 +09:00
0820ebddb9
AP_AHRS_MPU6000: first draft implementation of class that uses MPU6000's DMP to calculate attitude
2012-07-28 14:17:38 +09:00
5a9211c278
AP_AHRS: removed var_info from AP_AHRS class (moved to AP_AHRS_DCM)
2012-07-28 14:16:56 +09:00
c2b47d2bf9
AP_AHRS_DCM: moved var_info to belong to AP_AHRS_DCM instead of AP_AHRS
2012-07-28 14:16:15 +09:00
21f0ed00b3
AHRS: normalise GA_b before computing error vector only if too large
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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
5f5c884a6d
AHRS: if we don't have gps correction enabled, zero the yaw correction
2012-07-20 17:21:04 +10:00
4f41b876b1
AHRS: allow the gps/accelerometers to control yaw when rolled
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this solves a problem with yaw estimation when at high roll angles,
when the compass code becomes ineffective
2012-07-20 11:50:04 +10:00
804898c2a5
fix param config names
2012-07-14 15:34:15 +08:00
15133b1105
AHRS: fixed HIL build
2012-07-10 18:02:05 +10:00
9b6acf168e
AHRS: added AHRS_GPS_GAIN parameter
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this allows control of how much GPS velocity information is used in
doing centripetal correction in DCM
2012-07-10 16:22:48 +10:00
9845a55cb1
AHRS: make the yaw independent drift correction optional and disable
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the new correction algorithm copes poorly with gyro drift, leading to
signification attitude errors in the face of drift
2012-07-06 15:11:30 +10:00
e33554a1f9
AHRS: only enable barometer for AHRS if it is smooth enough
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if we used less than 5 samples to compute the pressure then don't use
it for climb rate
2012-07-05 16:29:21 +10:00
9d7ed30023
AHRS: only use GPS for yaw when compass is not being used
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this avoids having two competing controllers
2012-07-05 13:00:46 +10:00
6653c0b874
AHRS: enable barometer for vertical velocity
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this re-enables the barometer for vertical velocity information
for drift correction, now that we have a better filter
on the climb rate
2012-07-05 13:00:46 +10:00
cac0757c2e
AP_AHRS: removed DCM_test example sketch
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No longer required because it doesn't compile and is redundant anyway because the AP_AHRS_DCM class is tested in the AHRS_Test example sketch.
2012-07-04 18:22:51 +09:00
03516b7dfa
AHRS: make DCM drift correction not rely on accurate yaw
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this uses a new formulation of the GPS based drift correction from
Bill Premerlani that rotates the error vector to avoid relying on
accurate yaw. This means we should get accurate roll/pitch correction
even with lots of magnetometer interference
It also makes it possible to fly a multicopter with no compass. It can
even navigate and correct yaw (slowly!)
2012-07-04 17:00:40 +10:00
e0685f4408
AHRS: make P gain on PI roll/pitch controller tunable
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this is to make it easier for Craig and Alan to tune
2012-07-04 12:42:46 +10:00
b5aa821071
AHRS: include the P terms in get_gyro()
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this makes it more useful for navigation controllers
2012-06-29 21:54:09 +10:00
37494dda2b
AHRS: don't add the P terms in _omega
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this can lead feedback via the _P_gain()
2012-06-29 15:10:51 +10:00
21ae2957fb
AHRS: disable barometer for vertical acceleration
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this seems to have been the cause of the 'flips' seen by Marco and
others. Testing by Craig and Alan shows that the flips are gone when
the barometric acceleration is removed.
It looks like a 5 point average filter is not enough to keep the
vertical acceleteration noise low. With high noise in the z axes, the
x and y axes are scaled back when the ge vector is normalised.
2012-06-28 11:12:49 +10:00
e531061caa
AHRS: re-instate new DCM drift correction code
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This reverts commit 078489638d47fbaffde7c51249e36b5a8fc4ef9d.
2012-06-28 11:09:22 +10:00
8600ad8d7f
AHRS: revert to the old drift correction algorithm
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we need to work out why Craigs quad flipped today before we enable
this new drift correction
2012-06-27 18:16:41 +10:00
ce016b5ae8
AHRS: include P term in omega
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thanks to Jon for suggesting this
2012-06-27 16:01:50 +10:00
0fa1f29cf3
AHRS: implement spin rate limits
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this follows the method that Bill developed in his fastRotations
paper. We've demonstrated that this is indeed needed in APM, as we
were able to produce the 'dizzy' effects in both the ArduPlane and
ArduCopter simulator
2012-06-27 16:01:50 +10:00
3ffecc18d8
AHRS: cope with copters with no compass
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if a copter doesn't have a compass, we can't use the GPS for gyro
drift correction
2012-06-27 16:01:50 +10:00
5370f9c411
AHRS: normalize the ge vector in drift correction, and use barometer
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The normalisation ensures the error term scales uniformly with
different accelerations.
The barometer is used for vertical acceleration estimation
2012-06-27 16:01:50 +10:00
1ff9461bfb
AHRS: brought DCM more inline with Bill's implementation
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omega_I applied continuously. _ki larger. Stop integrating when _omega.length()>20
The key change was the scaling of ge to ensure the error is not
quadratic
2012-06-27 16:01:49 +10:00
73faaddc1b
AHRS: first successful version of Bills new drift correction system
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This makes 3 major changes:
1) fixes the scaling of the yaw drift correction term to fix the time
constant
2) don't integrate the mag vector over multiple readings
3) accumulate omega_I changes over 15 seconds before applying, to try
to prevent omega_I picking up short term responses
2012-06-27 16:01:49 +10:00
0399aa9480
AHRS: update for new _fly_forward flag
2012-06-27 16:01:49 +10:00
2600afe18a
AHRS: implement Bills new drift correction algorithm
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this is an initial implementation of this paper:
http://gentlenav.googlecode.com/files/RollPitchDriftCompensation.pdf
2012-06-27 16:01:49 +10:00
5316a45c20
AHRS: added GPS support to AHRS test
2012-06-27 16:01:49 +10:00
8f27297896
DCM: fixed a bug when using GPS for yaw correction
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When using GPS for yaw correction we need to apply the x and y omegaI
corrections from the _omega_I_sum in the period before we get to the
minimum ground speed for GPS yaw correction. Otherwise we get a large
sudden omega_I change on takeoff.
2012-05-21 12:15:06 +10:00
3b2d203f0f
AP_AHRS: updated default AHRS_YAW_P to 0.2 (was 0.4)
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This reduces the compass's default authority over the yaw direction by half
2012-04-30 17:29:45 +09:00
b1f19dbb01
AP_AHRS_DCM.cpp: Added comments that follow the new parse structure
2012-04-25 12:00:42 -05:00
6d837891b0
DCM: buffer omega_I changes over 10 seconds
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this buffers up _omega_I changes in _omega_I_sum over a period of 10
seconds, applying the slope limit only when _omega_I_sum is
transferred to _omega_I.
The result is a huge improvement in the ability of _omega_I to track
gyro drift over the long term.
2012-04-23 12:13:25 +10:00
398a608b83
DCM: drop the 'drop z' method
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the 'drop z' method reduced the impact of noise on omegaI, but it also
made us more sensitive to errors in accelerometer calibration and
scaling, as demonstated by the logs from Gabor here:
http://diydrones.com/xn/detail/705844:Comment:834373
Simulation testing shows that the other noise suppression methods
applied in the DCM code, in particular the slope limiting on omegaI
the removal of the weighting and the upcoming use of a _omega_I_sum
buffer have reduced the impact of noise enough that we can now safely
include z in the acceleration calculation.
2012-04-23 12:13:24 +10:00
2c8cd0b07b
AP_AHRS_HIL.h: Fixed HIL build by adding missing public property.
2012-04-16 10:26:14 -05:00
a9de75156b
AHRS: added AHRS_YAW_P parameter
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this allows users to change the yaw gain in DCM
2012-04-16 20:55:13 +10:00
4dac4c4c11
AP_AHRS - changed parameter order to remove compiler warning
2012-04-09 17:37:11 +09:00
Andrew Tridgell
Jason Short
rmackay9
Jonathan Challinger
Michael Oborne
Adam M Rivera