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AP_Compass: allow learning of all compasses

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slave secondary compasses to primary
This commit is contained in:
Andrew Tridgell 2018-10-19 16:20:18 +11:00
parent 5ac6309848
commit 0a7170774a
2 changed files with 28 additions and 7 deletions
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34
libraries/AP_Compass/Compass_learn.cpp
View File

@ -39,6 +39,9 @@ void CompassLearn::update(void)
return;
}
// remember primary mag
primary_mag = compass.get_primary();
// setup the expected earth field at this location
float declination_deg=0, inclination_deg=0, intensity_gauss=0;
AP_Declination::get_mag_field_ef(loc.lat*1.0e-7, loc.lng*1.0e-7, intensity_gauss, declination_deg, inclination_deg);
@ -55,8 +58,8 @@ void CompassLearn::update(void)
// form eliptical correction matrix and invert it. This is
// needed to remove the effects of the eliptical correction
// when calculating new offsets
const Vector3f &diagonals = compass.get_diagonals(0);
const Vector3f &offdiagonals = compass.get_offdiagonals(0);
const Vector3f &diagonals = compass.get_diagonals(primary_mag);
const Vector3f &offdiagonals = compass.get_offdiagonals(primary_mag);
mat = Matrix3f(
diagonals.x, offdiagonals.x, offdiagonals.y,
offdiagonals.x, diagonals.y, offdiagonals.z,
@ -81,7 +84,7 @@ void CompassLearn::update(void)
return;
}
Vector3f field = compass.get_field(0);
Vector3f field = compass.get_field(primary_mag);
Vector3f field_change = field - last_field;
if (field_change.length() < min_field_change) {
return;
@ -91,7 +94,7 @@ void CompassLearn::update(void)
WITH_SEMAPHORE(sem);
// give a sample to the backend to process
new_sample.field = field;
new_sample.offsets = compass.get_offsets(0);
new_sample.offsets = compass.get_offsets(primary_mag);
new_sample.attitude = Vector3f(ahrs.roll, ahrs.pitch, ahrs.yaw);
sample_available = true;
last_field = field;
@ -113,13 +116,30 @@ void CompassLearn::update(void)
if (!converged) {
WITH_SEMAPHORE(sem);
// set offsets to current best guess
compass.set_offsets(primary_mag, best_offsets);
// set non-primary offsets to match primary
Vector3f field_primary = compass.get_field(primary_mag);
for (uint8_t i=0; i<compass.get_count(); i++) {
if (i == primary_mag || !compass._state[i].use_for_yaw) {
continue;
}
Vector3f field2 = compass.get_field(i);
Vector3f new_offsets = compass.get_offsets(i) + (field_primary - field2);
compass.set_offsets(i, new_offsets);
}
// stop updating the offsets once converged
compass.set_offsets(0, best_offsets);
if (num_samples > 30 && best_error < 50 && worst_error > 65) {
// set the offsets and enable compass for EKF use. Let the
// EKF learn the remaining compass offset error
compass.save_offsets(0);
compass.set_use_for_yaw(0, true);
for (uint8_t i=0; i<compass.get_count(); i++) {
if (compass._state[i].use_for_yaw) {
compass.save_offsets(i);
compass.set_use_for_yaw(i, true);
}
}
compass.set_learn_type(Compass::LEARN_EKF, true);
converged = true;
gcs().send_text(MAV_SEVERITY_INFO, "CompassLearn: finished");

1
libraries/AP_Compass/Compass_learn.h
View File

@ -51,6 +51,7 @@ private:
float best_yaw_deg;
float worst_error;
bool converged;
uint8_t primary_mag;
void io_timer(void);
void process_sample(const struct sample &s);