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ekf2: reset manual position update through fusion

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This provides a position reset-like behavior while still updating the
correlated states through fusion of position information.
This commit is contained in:
bresch
2025-07-29 14:04:31 +02:00
committed by Mathieu Bresciani
parent 582b8f0a2b
commit b740a43b3d
1 changed files with 23 additions and 7 deletions
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src/modules/ekf2/EKF/ekf.cpp
+23 -7
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@@ -336,7 +336,7 @@ bool Ekf::resetGlobalPosToExternalObservation(const double latitude, const doubl
const bool innov_rejected = (test_ratio > 1.f);
if (!_control_status.flags.in_air || (eph > 0.f && eph < 1.f) || innov_rejected) {
// when on ground or accuracy chosen to be very low, we hard reset position
// When on ground or accuracy chosen to be very low, we hard reset position
// this allows the user to still send hard resets at any time
ECL_INFO("reset position to external observation");
_information_events.flags.reset_pos_to_ext_obs = true;
@@ -346,13 +346,29 @@ bool Ekf::resetGlobalPosToExternalObservation(const double latitude, const doubl
} else {
ECL_INFO("fuse external observation as position measurement");
fuseDirectStateMeasurement(innov(0), innov_var(0), obs_var, State::pos.idx + 0);
fuseDirectStateMeasurement(innov(1), innov_var(1), obs_var, State::pos.idx + 1);
// Use the reset counters to inform the controllers about a potential large position jump
// TODO: compute the actual position change
_state_reset_status.reset_count.posNE++;
_state_reset_status.posNE_change.zero();
VectorState H;
VectorState K;
for (unsigned index = 0; index < 2; index++) {
K = VectorState(P.row(State::pos.idx + index)) / innov_var(index);
H(State::pos.idx + index) = 1.f;
// Artificially set the position Kalman gain to 1 in order to force a reset
// of the position through fusion. This allows the EKF to use part of the information
// to continue learning the correlated states (e.g.: velocity, heading, wind) while
// performing a position reset.
K(State::pos.idx + index) = 1.f;
measurementUpdate(K, H, obs_var, innov(index));
H(State::pos.idx + index) = 0.f; // Reset the whole vector to 0
}
// Use the reset counters to inform the controllers about a position jump
updateHorizontalPositionResetStatus(-innov);
// Reset the positon of the output predictor to avoid a transient that would disturb the
// position controller
_output_predictor.resetLatLonTo(_gpos.latitude_deg(), _gpos.longitude_deg());
_time_last_hor_pos_fuse = _time_delayed_us;
_last_known_gpos.setLatLon(gpos_corrected);