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Added gyro scale estimation (but param is NOT written)

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Lorenz Meier 2013-07-19 13:07:51 +02:00
parent 1575da4390
commit da1bf69ce2
1 changed files with 80 additions and 0 deletions
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80
src/modules/commander/gyro_calibration.c
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@ -104,6 +104,86 @@ void do_gyro_calibration(int mavlink_fd)
gyro_offset[1] = gyro_offset[1] / calibration_count;
gyro_offset[2] = gyro_offset[2] / calibration_count;
/*** --- SCALING --- ***/
mavlink_log_info(mavlink_fd, "offset calibration finished. Rotate for scale 130x");
mavlink_log_info(mavlink_fd, "or do not rotate and wait for 5 seconds to skip.");
warnx("offset calibration finished. Rotate for scale 30x, or do not rotate and wait for 5 seconds to skip.");
unsigned rotations_count = 30;
float gyro_integral = 0.0f;
float baseline_integral = 0.0f;
// XXX change to mag topic
orb_copy(ORB_ID(sensor_combined), sub_sensor_combined, &raw);
float mag_last = -atan2f(raw.magnetometer_ga[1],raw.magnetometer_ga[0]);
if (mag_last > M_PI_F) mag_last -= 2*M_PI_F;
if (mag_last < -M_PI_F) mag_last += 2*M_PI_F;
uint64_t last_time = hrt_absolute_time();
uint64_t start_time = hrt_absolute_time();
while ((int)fabsf(baseline_integral / (2.0f * M_PI_F)) < rotations_count) {
/* abort this loop if not rotated more than 180 degrees within 5 seconds */
if ((fabsf(baseline_integral / (2.0f * M_PI_F)) < 0.6f)
&& (hrt_absolute_time() - start_time > 5 * 1e6))
break;
/* wait blocking for new data */
struct pollfd fds[1] = { { .fd = sub_sensor_combined, .events = POLLIN } };
int poll_ret = poll(fds, 1, 1000);
if (poll_ret) {
float dt_ms = (hrt_absolute_time() - last_time) / 1e3f;
last_time = hrt_absolute_time();
orb_copy(ORB_ID(sensor_combined), sub_sensor_combined, &raw);
// XXX this is just a proof of concept and needs world / body
// transformation and more
//math::Vector2f magNav(raw.magnetometer_ga);
// calculate error between estimate and measurement
// apply declination correction for true heading as well.
//float mag = -atan2f(magNav(1),magNav(0));
float mag = -atan2f(raw.magnetometer_ga[1],raw.magnetometer_ga[0]);
if (mag > M_PI_F) mag -= 2*M_PI_F;
if (mag < -M_PI_F) mag += 2*M_PI_F;
float diff = mag - mag_last;
if (diff > M_PI_F) diff -= 2*M_PI_F;
if (diff < -M_PI_F) diff += 2*M_PI_F;
baseline_integral += diff;
mag_last = mag;
// Jump through some timing scale hoops to avoid
// operating near the 1e6/1e8 max sane resolution of float.
gyro_integral += (raw.gyro_rad_s[2] * dt_ms) / 1e3f;
warnx("dbg: b: %6.4f, g: %6.4f", baseline_integral, gyro_integral);
// } else if (poll_ret == 0) {
// /* any poll failure for 1s is a reason to abort */
// mavlink_log_info(mavlink_fd, "gyro calibration aborted, retry");
// return;
}
}
float gyro_scale = baseline_integral / gyro_integral;
warnx("gyro scale: yaw (z): %6.4f", gyro_scale);
mavlink_log_info(mavlink_fd, "gyro scale: yaw (z): %6.4f", gyro_scale);
if (isfinite(gyro_offset[0]) && isfinite(gyro_offset[1]) && isfinite(gyro_offset[2])) {
if (param_set(param_find("SENS_GYRO_XOFF"), &(gyro_offset[0]))