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AP_NavEKF: catch covarience errors and reset filter

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this catches covariance values beyond a reasonable limit and resets
the filter is they happen
This commit is contained in:
Andrew Tridgell 2014-04-21 15:24:16 +10:00
parent 7e5a491f14
commit 610a930612
1 changed files with 20 additions and 2 deletions
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22
libraries/AP_NavEKF/AP_NavEKF.cpp
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@ -95,6 +95,9 @@ extern const AP_HAL::HAL& hal;
#define earthRate 0.000072921f // earth rotation rate (rad/sec)
// maximum value for any element in the covariance matrix
#define EKF_COVARIENCE_MAX 1.0e8f
// when the wind estimation first starts with no airspeed sensor,
// assume 3m/s to start
#define STARTUP_WIND_SPEED 3.0f
@ -2641,6 +2644,10 @@ bool NavEKF::getPosNED(Vector3f &pos) const
// return body axis gyro bias estimates in rad/sec
void NavEKF::getGyroBias(Vector3f &gyroBias) const
{
if (dtIMU == 0) {
gyroBias.zero();
return;
}
gyroBias.x = states[10] / dtIMU;
gyroBias.y = states[11] / dtIMU;
gyroBias.z = states[12] / dtIMU;
@ -2650,8 +2657,13 @@ void NavEKF::getGyroBias(Vector3f &gyroBias) const
void NavEKF::getAccelBias(Vector3f &accelBias) const
{
accelBias.x = IMU1_weighting;
accelBias.y = states[22] / dtIMU;
accelBias.z = states[13] / dtIMU;
if (dtIMU == 0) {
accelBias.y = 0;
accelBias.z = 0;
} else {
accelBias.y = states[22] / dtIMU;
accelBias.z = states[13] / dtIMU;
}
}
// return the NED wind speed estimates in m/s (positive is air moving in the direction of the axis)
@ -2778,6 +2790,12 @@ void NavEKF::ForceSymmetry()
{
for (uint8_t j=0; j<=i-1; j++)
{
if (fabsf(P[i][j]) > EKF_COVARIENCE_MAX ||
fabsf(P[j][i]) > EKF_COVARIENCE_MAX) {
// re-initialise the filter from scratch
InitialiseFilterDynamic();
return;
}
float temp = 0.5f*(P[i][j] + P[j][i]);
P[i][j] = temp;
P[j][i] = temp;