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fixed method which calculates validity of terrain estimate

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Signed-off-by: RomanBapst <bapstroman@gmail.com>
This commit is contained in:
RomanBapst
2019-05-24 12:17:21 -04:00
committed by Paul Riseborough
parent cd34ab802d
commit 0f49eb34a0
1 changed files with 11 additions and 1 deletions
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EKF/terrain_estimator.cpp
+11 -1
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@@ -242,6 +242,7 @@ void Ekf::fuseFlowForTerrain()
_terrain_vpos += Kx * _flow_innov[0];
// guard against negative variance
_terrain_var = fmaxf(_terrain_var - KxHxP, 0.0f);
_time_last_of_fuse = _time_last_imu;
}
// Calculate observation matrix for flow around the vehicle y axis
@@ -269,6 +270,7 @@ void Ekf::fuseFlowForTerrain()
_terrain_vpos += Ky * _flow_innov[1];
// guard against negative variance
_terrain_var = fmaxf(_terrain_var - KyHyP, 0.0f);
_time_last_of_fuse = _time_last_imu;
}
}
@@ -281,7 +283,15 @@ bool Ekf::get_terrain_valid()
// determine terrain validity
void Ekf::update_terrain_valid()
{
if (_terrain_initialised && ((_time_last_imu - _time_last_hagl_fuse) < (uint64_t)5e6)) {
// we have been fusing range finder measurements in the last 5 seconds
bool recent_range_fusion = (_time_last_imu - _time_last_hagl_fuse) < 5*1000*1000;
// we have been fusing optical flow measurements for terrain estimation within the last 5 seconds
// this can only be the case if the main filter does not fuse optical flow
bool recent_flow_for_terrain_fusion = ((_time_last_imu - _time_last_of_fuse) < 5*1000*1000) && !_control_status.flags.opt_flow;
if (_terrain_initialised && (recent_range_fusion || recent_flow_for_terrain_fusion)) {
_hagl_valid = true;