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EKF: Allow dead-reckoning using air data

This commit is contained in:
Paul Riseborough 2017-10-19 08:26:16 +11:00
parent f5fd90533a
commit 204a218ee6
1 changed files with 13 additions and 12 deletions
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21
EKF/control.cpp
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@ -394,7 +394,7 @@ void Ekf::controlOpticalFlowFusion()
_last_known_posNE(0) = _state.pos(0);
_last_known_posNE(1) = _state.pos(1);
_state.vel.setZero();
ECL_WARN("EKF Resetting states");
ECL_WARN("EKF stopping navigation");
}
}
@ -493,19 +493,20 @@ void Ekf::controlGpsFusion()
} else {
// handle the case where we do not have GPS and have not been using it for an extended period, but are still relying on it
if ((_time_last_imu - _time_last_gps > 10e6) && _control_status.flags.gps) {
// if we don't have a source of aiding to constrain attitude drift,
// then we need to switch to the non-aiding mode, zero the velocity states
// and set the synthetic GPS position to the current estimate
bool lost_gps = _control_status.flags.gps && (_time_last_imu - _time_last_gps > 10e6);
bool no_velpos_aiding = !_control_status.flags.opt_flow && !_control_status.flags.ev_pos;
bool no_airdata_aiding = (_time_last_imu - _time_last_arsp_fuse > 10e6) || (_time_last_imu - _time_last_beta_fuse > 10e6);
// If we don't have a source of aiding to constrain attitude drift, then we need to switch
// to the non-aiding mode, zero the velocity states and set the position to the current estimate.
// Air data aiding prevents loss of attitude reference, constrains velocity drift and can assist
// a FW vehicle to recover to the launch area.
if (lost_gps && no_velpos_aiding && no_airdata_aiding) {
_control_status.flags.gps = false;
ECL_INFO("EKF Stopping GPS Use");
if (!_control_status.flags.opt_flow && !_control_status.flags.ev_pos) {
_last_known_posNE(0) = _state.pos(0);
_last_known_posNE(1) = _state.pos(1);
_state.vel.setZero();
ECL_WARN("EKF Resetting states");
}
ECL_WARN("EKF stopping navigation");
}
}
}