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LPE flow improvements.

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This commit is contained in:
James Goppert
2016-10-12 23:05:53 -05:00
committed by James Goppert
parent db44129ec0
commit cf658638f4
5 changed files with 52 additions and 52 deletions
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src/modules/local_position_estimator/sensors/flow.cpp
+36 -10
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@@ -8,7 +8,7 @@ extern orb_advert_t mavlink_log_pub;
// required number of samples for sensor
// to initialize
static const uint32_t REQ_FLOW_INIT_COUNT = 10;
static const uint32_t FLOW_TIMEOUT = 1000000; // 1 s
static const uint32_t FLOW_TIMEOUT = 1000000; // 1 s
// minimum flow altitude
static const float flow_min_agl = 0.05;
@@ -67,8 +67,9 @@ int BlockLocalPositionEstimator::flowMeasure(Vector<float, n_y_flow> &y)
float d = agl() * cosf(_sub_att.get().roll) * cosf(_sub_att.get().pitch);
// optical flow in x, y axis
float flow_x_rad = _sub_flow.get().pixel_flow_x_integral;
float flow_y_rad = _sub_flow.get().pixel_flow_y_integral;
// TODO consider making flow scale a states of the kalman filter
float flow_x_rad = _sub_flow.get().pixel_flow_x_integral * _flow_scale.get();
float flow_y_rad = _sub_flow.get().pixel_flow_y_integral * _flow_scale.get();
float dt_flow = _sub_flow.get().integration_timespan / 1.0e6f;
if (dt_flow > 0.5f || dt_flow < 1.0e-6f) {
@@ -127,13 +128,38 @@ void BlockLocalPositionEstimator::flowCorrect()
SquareMatrix<float, n_y_flow> R;
R.setZero();
float d = agl() * cosf(_sub_att.get().roll) * cosf(_sub_att.get().pitch);
float rot_rate_norm = sqrtf(_sub_att.get().rollspeed * _sub_att.get().rollspeed
+ _sub_att.get().pitchspeed * _sub_att.get().pitchspeed
+ _sub_att.get().yawspeed * _sub_att.get().yawspeed);
float flow_vxy_stddev = _flow_vxy_stddev.get()
+ _flow_vxy_d_stddev.get() * d
+ _flow_vxy_r_stddev.get() * rot_rate_norm;
// polynomial noise model, found using least squares fit
// h, h**2, v, v*h, v*h**2
const float p[5] = {0.04005232f, -0.00656446f, -0.26265873f, 0.13686658f, -0.00397357f};
// prevent extrapolation past end of polynomial fit by bounding independent variables
float h = agl();
float v = y.norm();
const float h_min = 2.0f;
const float h_max = 8.0f;
const float v_min = 0.5f;
const float v_max = 1.0f;
if (h > h_max) {
h = h_max;
}
if (h < h_min) {
h = h_min;
}
if (v > v_max) {
v = v_max;
}
if (v < v_min) {
v = v_min;
}
// compute polynomial value
float flow_vxy_stddev = p[0] * h + p[1] * h * h + p[2] * v + p[3] * v * h + p[4] * v * h * h;
R(Y_flow_vx, Y_flow_vx) = flow_vxy_stddev * flow_vxy_stddev;
R(Y_flow_vy, Y_flow_vy) = R(Y_flow_vx, Y_flow_vx);