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EKF: airspeed fusion cleanup

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This commit is contained in:
Paul Riseborough
2020-08-15 09:24:35 +10:00
committed by Paul Riseborough
parent a5a43dbc6c
commit ede6204f85
1 changed files with 12 additions and 15 deletions
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EKF/airspeed_fusion.cpp
+12 -15
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@@ -47,9 +47,6 @@
void Ekf::fuseAirspeed()
{
SparseVector24f<4,5,6,22,23> Hfusion; // Observation Jacobians
Vector24f Kfusion; // Kalman gain vector
const float &vn = _state.vel(0); // Velocity in north direction
const float &ve = _state.vel(1); // Velocity in east direction
const float &vd = _state.vel(2); // Velocity in downwards direction
@@ -67,12 +64,12 @@ void Ekf::fuseAirspeed()
const float HK0 = vn - vwn;
const float HK1 = ve - vwe;
const float HK2 = ecl::powf(HK0, 2) + ecl::powf(HK1, 2) + ecl::powf(vd, 2);
if (HK2 < 1.0f) {
const float v_tas_pred = sqrtf(HK2); // predicted airspeed
//const float HK3 = powf(HK2, -1.0F/2.0F);
if (v_tas_pred < 1.0f) {
// calculation can be badly conditioned for very low airspeed values so don't fuse this time
return;
}
const float v_tas_pred = sqrtf(HK2); // predicted airspeed
//const float HK3 = powf(HK2, -1.0F/2.0F);
const float HK3 = 1.0f / v_tas_pred;
const float HK4 = HK0*HK3;
const float HK5 = HK1*HK3;
@@ -87,17 +84,11 @@ void Ekf::fuseAirspeed()
const float HK14 = -HK0*P(22,23) + HK0*P(4,23) - HK1*P(23,23) + HK8 + P(6,23)*vd;
const float HK15 = -HK0*P(22,22) - HK1*P(22,23) + HK1*P(5,22) + HK11 + P(6,22)*vd;
//const float HK16 = HK3/(-HK10*HK14 + HK10*HK9 + HK12*HK13 - HK13*HK15 + HK6*HK7*vd + R_TAS);
float HK16;
// innovation variance
// innovation variance - check for badly conditioned calculation
_airspeed_innov_var = (-HK10*HK14 + HK10*HK9 + HK12*HK13 - HK13*HK15 + HK6*HK7*vd + R_TAS);
if (_airspeed_innov_var >= R_TAS) { // Check for badly conditioned calculation
HK16 = HK3 / _airspeed_innov_var;
_fault_status.flags.bad_airspeed = false;
} else { // Reset the estimator covariance matrix
_fault_status.flags.bad_airspeed = true;
if (_airspeed_innov_var < R_TAS) { //
// Reset the estimator covariance matrix
// if we are getting aiding from other sources, warn and reset the wind states and covariances only
const char* action_string = nullptr;
if (update_wind_only) {
@@ -112,16 +103,22 @@ void Ekf::fuseAirspeed()
}
ECL_ERR("airspeed badly conditioned - %s covariance reset", action_string);
_fault_status.flags.bad_airspeed = true;
return;
}
const float HK16 = HK3 / _airspeed_innov_var;
_fault_status.flags.bad_airspeed = false;
// Observation Jacobians
SparseVector24f<4,5,6,22,23> Hfusion;
Hfusion.at<4>() = HK4;
Hfusion.at<5>() = HK5;
Hfusion.at<6>() = HK3*vd;
Hfusion.at<22>() = -HK4;
Hfusion.at<23>() = -HK5;
Vector24f Kfusion; // Kalman gain vector
if (!update_wind_only) {
// we have no other source of aiding, so use airspeed measurements to correct states
for (unsigned row = 0; row <= 3; row++) {