diff options
Diffstat (limited to 'src/modules/position_estimator_inav/position_estimator_inav_main.c')
-rw-r--r-- | src/modules/position_estimator_inav/position_estimator_inav_main.c | 196 |
1 files changed, 132 insertions, 64 deletions
diff --git a/src/modules/position_estimator_inav/position_estimator_inav_main.c b/src/modules/position_estimator_inav/position_estimator_inav_main.c index fdc3233e0..f908d7a3b 100644 --- a/src/modules/position_estimator_inav/position_estimator_inav_main.c +++ b/src/modules/position_estimator_inav/position_estimator_inav_main.c @@ -71,19 +71,20 @@ #include "inertial_filter.h" #define MIN_VALID_W 0.00001f +#define PUB_INTERVAL 10000 // limit publish rate to 100 Hz +#define EST_BUF_SIZE 250000 / PUB_INTERVAL // buffer size is 0.5s static bool thread_should_exit = false; /**< Deamon exit flag */ static bool thread_running = false; /**< Deamon status flag */ static int position_estimator_inav_task; /**< Handle of deamon task / thread */ static bool verbose_mode = false; -static const hrt_abstime gps_topic_timeout = 1000000; // GPS topic timeout = 1s +static const hrt_abstime gps_topic_timeout = 500000; // GPS topic timeout = 0.5s static const hrt_abstime flow_topic_timeout = 1000000; // optical flow topic timeout = 1s static const hrt_abstime sonar_timeout = 150000; // sonar timeout = 150ms static const hrt_abstime sonar_valid_timeout = 1000000; // estimate sonar distance during this time after sonar loss static const hrt_abstime xy_src_timeout = 2000000; // estimate position during this time after position sources loss static const uint32_t updates_counter_len = 1000000; -static const uint32_t pub_interval = 10000; // limit publish rate to 100 Hz static const float max_flow = 1.0f; // max flow value that can be used, rad/s __EXPORT int position_estimator_inav_main(int argc, char *argv[]); @@ -92,6 +93,16 @@ int position_estimator_inav_thread_main(int argc, char *argv[]); static void usage(const char *reason); +static inline int min(int val1, int val2) +{ + return (val1 < val2) ? val1 : val2; +} + +static inline int max(int val1, int val2) +{ + return (val1 > val2) ? val1 : val2; +} + /** * Print the correct usage. */ @@ -135,7 +146,7 @@ int position_estimator_inav_main(int argc, char *argv[]) thread_should_exit = false; position_estimator_inav_task = task_spawn_cmd("position_estimator_inav", - SCHED_DEFAULT, SCHED_PRIORITY_MAX - 5, 4000, + SCHED_DEFAULT, SCHED_PRIORITY_MAX - 5, 5000, position_estimator_inav_thread_main, (argv) ? (const char **) &argv[2] : (const char **) NULL); exit(0); @@ -168,15 +179,15 @@ int position_estimator_inav_main(int argc, char *argv[]) exit(1); } -void write_debug_log(const char *msg, float dt, float x_est[3], float y_est[3], float z_est[3], float x_est_prev[3], float y_est_prev[3], float z_est_prev[3], float corr_acc[3], float corr_gps[3][2], float w_xy_gps_p, float w_xy_gps_v) +void write_debug_log(const char *msg, float dt, float x_est[2], float y_est[2], float z_est[2], float x_est_prev[2], float y_est_prev[2], float z_est_prev[2], float acc[3], float corr_gps[3][2], float w_xy_gps_p, float w_xy_gps_v) { FILE *f = fopen("/fs/microsd/inav.log", "a"); if (f) { char *s = malloc(256); - unsigned n = snprintf(s, 256, "%llu %s\n\tdt=%.5f x_est=[%.5f %.5f %.5f] y_est=[%.5f %.5f %.5f] z_est=[%.5f %.5f %.5f] x_est_prev=[%.5f %.5f %.5f] y_est_prev=[%.5f %.5f %.5f] z_est_prev=[%.5f %.5f %.5f]\n", hrt_absolute_time(), msg, dt, x_est[0], x_est[1], x_est[2], y_est[0], y_est[1], y_est[2], z_est[0], z_est[1], z_est[2], x_est_prev[0], x_est_prev[1], x_est_prev[2], y_est_prev[0], y_est_prev[1], y_est_prev[2], z_est_prev[0], z_est_prev[1], z_est_prev[2]); + unsigned n = snprintf(s, 256, "%llu %s\n\tdt=%.5f x_est=[%.5f %.5f] y_est=[%.5f %.5f] z_est=[%.5f %.5f] x_est_prev=[%.5f %.5f] y_est_prev=[%.5f %.5f] z_est_prev=[%.5f %.5f]\n", hrt_absolute_time(), msg, dt, x_est[0], x_est[1], y_est[0], y_est[1], z_est[0], z_est[1], x_est_prev[0], x_est_prev[1], y_est_prev[0], y_est_prev[1], z_est_prev[0], z_est_prev[1]); fwrite(s, 1, n, f); - n = snprintf(s, 256, "\tacc_corr=[%.5f %.5f %.5f] gps_pos_corr=[%.5f %.5f %.5f] gps_vel_corr=[%.5f %.5f %.5f] w_xy_gps_p=%.5f w_xy_gps_v=%.5f\n", corr_acc[0], corr_acc[1], corr_acc[2], corr_gps[0][0], corr_gps[1][0], corr_gps[2][0], corr_gps[0][1], corr_gps[1][1], corr_gps[2][1], w_xy_gps_p, w_xy_gps_v); + n = snprintf(s, 256, "\tacc=[%.5f %.5f %.5f] gps_pos_corr=[%.5f %.5f %.5f] gps_vel_corr=[%.5f %.5f %.5f] w_xy_gps_p=%.5f w_xy_gps_v=%.5f\n", acc[0], acc[1], acc[2], corr_gps[0][0], corr_gps[1][0], corr_gps[2][0], corr_gps[0][1], corr_gps[1][1], corr_gps[2][1], w_xy_gps_p, w_xy_gps_v); fwrite(s, 1, n, f); free(s); } @@ -195,14 +206,27 @@ int position_estimator_inav_thread_main(int argc, char *argv[]) mavlink_fd = open(MAVLINK_LOG_DEVICE, 0); mavlink_log_info(mavlink_fd, "[inav] started"); - float x_est[3] = { 0.0f, 0.0f, 0.0f }; - float y_est[3] = { 0.0f, 0.0f, 0.0f }; - float z_est[3] = { 0.0f, 0.0f, 0.0f }; + float x_est[2] = { 0.0f, 0.0f }; // pos, vel + float y_est[2] = { 0.0f, 0.0f }; // pos, vel + float z_est[2] = { 0.0f, 0.0f }; // pos, vel - float eph = 1.0; - float epv = 1.0; + float est_buf[EST_BUF_SIZE][3][2]; // estimated position buffer + float R_buf[EST_BUF_SIZE][3][3]; // rotation matrix buffer + float R_gps[3][3]; // rotation matrix for GPS correction moment + memset(est_buf, 0, sizeof(est_buf)); + memset(R_buf, 0, sizeof(R_buf)); + memset(R_gps, 0, sizeof(R_gps)); + int buf_ptr = 0; - float x_est_prev[3], y_est_prev[3], z_est_prev[3]; + static const float min_eph_epv = 2.0f; // min EPH/EPV, used for weight calculation + static const float max_eph_epv = 20.0f; // max EPH/EPV acceptable for estimation + + float eph = max_eph_epv; + float epv = 1.0f; + + float eph_flow = 1.0f; + + float x_est_prev[2], y_est_prev[2], z_est_prev[2]; memset(x_est_prev, 0, sizeof(x_est_prev)); memset(y_est_prev, 0, sizeof(y_est_prev)); memset(z_est_prev, 0, sizeof(z_est_prev)); @@ -241,7 +265,7 @@ int position_estimator_inav_thread_main(int argc, char *argv[]) float accel_NED[3] = { 0.0f, 0.0f, -CONSTANTS_ONE_G }; /* store error when sensor updates, but correct on each time step to avoid jumps in estimated value */ - float corr_acc[] = { 0.0f, 0.0f, 0.0f }; // N E D + float acc[] = { 0.0f, 0.0f, 0.0f }; // N E D float acc_bias[] = { 0.0f, 0.0f, 0.0f }; // body frame float corr_baro = 0.0f; // D float corr_gps[3][2] = { @@ -257,9 +281,6 @@ int position_estimator_inav_thread_main(int argc, char *argv[]) float corr_flow[] = { 0.0f, 0.0f }; // N E float w_flow = 0.0f; - static float min_eph_epv = 2.0f; // min EPH/EPV, used for weight calculation - static float max_eph_epv = 10.0f; // max EPH/EPV acceptable for estimation - float sonar_prev = 0.0f; hrt_abstime flow_prev = 0; // time of last flow measurement hrt_abstime sonar_time = 0; // time of last sonar measurement (not filtered) @@ -341,8 +362,10 @@ int position_estimator_inav_thread_main(int argc, char *argv[]) /* mean calculation over several measurements */ if (baro_init_cnt < baro_init_num) { - baro_offset += sensor.baro_alt_meter; - baro_init_cnt++; + if (isfinite(sensor.baro_alt_meter)) { + baro_offset += sensor.baro_alt_meter; + baro_init_cnt++; + } } else { wait_baro = false; @@ -418,19 +441,17 @@ int position_estimator_inav_thread_main(int argc, char *argv[]) /* transform acceleration vector from body frame to NED frame */ for (int i = 0; i < 3; i++) { - accel_NED[i] = 0.0f; + acc[i] = 0.0f; for (int j = 0; j < 3; j++) { - accel_NED[i] += att.R[i][j] * sensor.accelerometer_m_s2[j]; + acc[i] += att.R[i][j] * sensor.accelerometer_m_s2[j]; } } - corr_acc[0] = accel_NED[0] - x_est[2]; - corr_acc[1] = accel_NED[1] - y_est[2]; - corr_acc[2] = accel_NED[2] + CONSTANTS_ONE_G - z_est[2]; + acc[2] += CONSTANTS_ONE_G; } else { - memset(corr_acc, 0, sizeof(corr_acc)); + memset(acc, 0, sizeof(acc)); } accel_timestamp = sensor.accelerometer_timestamp; @@ -536,9 +557,10 @@ int position_estimator_inav_thread_main(int argc, char *argv[]) w_flow *= 0.05f; } - flow_valid = true; + /* under ideal conditions, on 1m distance assume EPH = 10cm */ + eph_flow = 0.1 / w_flow; - eph = fminf(eph, 0.1 / att.R[2][2] / flow_q * fmaxf(1.0f, flow_dist)); // under ideal conditions, on 1m distance assume EPH = 10cm + flow_valid = true; } else { w_flow = 0.0f; @@ -597,13 +619,13 @@ int position_estimator_inav_thread_main(int argc, char *argv[]) /* hysteresis for GPS quality */ if (gps_valid) { - if (gps.eph_m > max_eph_epv * 1.5f || gps.epv_m > max_eph_epv * 1.5f || gps.fix_type < 3) { + if (gps.eph_m > max_eph_epv || gps.epv_m > max_eph_epv || gps.fix_type < 3) { gps_valid = false; mavlink_log_info(mavlink_fd, "[inav] GPS signal lost"); } } else { - if (gps.eph_m < max_eph_epv && gps.epv_m < max_eph_epv && gps.fix_type >= 3) { + if (gps.eph_m < max_eph_epv * 0.7f && gps.epv_m < max_eph_epv * 0.7f && gps.fix_type >= 3) { gps_valid = true; reset_est = true; mavlink_log_info(mavlink_fd, "[inav] GPS signal found"); @@ -628,11 +650,9 @@ int position_estimator_inav_thread_main(int argc, char *argv[]) /* set position estimate to (0, 0, 0), use GPS velocity for XY */ x_est[0] = 0.0f; x_est[1] = gps.vel_n_m_s; - x_est[2] = accel_NED[0]; y_est[0] = 0.0f; y_est[1] = gps.vel_e_m_s; z_est[0] = 0.0f; - y_est[2] = accel_NED[1]; local_pos.ref_lat = lat; local_pos.ref_lon = lon; @@ -655,22 +675,26 @@ int position_estimator_inav_thread_main(int argc, char *argv[]) if (reset_est) { x_est[0] = gps_proj[0]; x_est[1] = gps.vel_n_m_s; - x_est[2] = accel_NED[0]; y_est[0] = gps_proj[1]; y_est[1] = gps.vel_e_m_s; - y_est[2] = accel_NED[1]; + } + + /* calculate index of estimated values in buffer */ + int est_i = buf_ptr - 1 - min(EST_BUF_SIZE - 1, max(0, (int)(params.delay_gps * 1000000.0f / PUB_INTERVAL))); + if (est_i < 0) { + est_i += EST_BUF_SIZE; } /* calculate correction for position */ - corr_gps[0][0] = gps_proj[0] - x_est[0]; - corr_gps[1][0] = gps_proj[1] - y_est[0]; - corr_gps[2][0] = local_pos.ref_alt - alt - z_est[0]; + corr_gps[0][0] = gps_proj[0] - est_buf[est_i][0][0]; + corr_gps[1][0] = gps_proj[1] - est_buf[est_i][1][0]; + corr_gps[2][0] = local_pos.ref_alt - alt - est_buf[est_i][2][0]; /* calculate correction for velocity */ if (gps.vel_ned_valid) { - corr_gps[0][1] = gps.vel_n_m_s - x_est[1]; - corr_gps[1][1] = gps.vel_e_m_s - y_est[1]; - corr_gps[2][1] = gps.vel_d_m_s - z_est[1]; + corr_gps[0][1] = gps.vel_n_m_s - est_buf[est_i][0][1]; + corr_gps[1][1] = gps.vel_e_m_s - est_buf[est_i][1][1]; + corr_gps[2][1] = gps.vel_d_m_s - est_buf[est_i][2][1]; } else { corr_gps[0][1] = 0.0f; @@ -678,8 +702,8 @@ int position_estimator_inav_thread_main(int argc, char *argv[]) corr_gps[2][1] = 0.0f; } - eph = fminf(eph, gps.eph_m); - epv = fminf(epv, gps.epv_m); + /* save rotation matrix at this moment */ + memcpy(R_gps, R_buf[est_i], sizeof(R_gps)); w_gps_xy = min_eph_epv / fmaxf(min_eph_epv, gps.eph_m); w_gps_z = min_eph_epv / fmaxf(min_eph_epv, gps.epv_m); @@ -721,8 +745,12 @@ int position_estimator_inav_thread_main(int argc, char *argv[]) t_prev = t; /* increase EPH/EPV on each step */ - eph *= 1.0 + dt; - epv += 0.005 * dt; // add 1m to EPV each 200s (baro drift) + if (eph < max_eph_epv) { + eph *= 1.0 + dt; + } + if (epv < max_eph_epv) { + epv += 0.005 * dt; // add 1m to EPV each 200s (baro drift) + } /* use GPS if it's valid and reference position initialized */ bool use_gps_xy = ref_inited && gps_valid && params.w_xy_gps_p > MIN_VALID_W; @@ -735,7 +763,7 @@ int position_estimator_inav_thread_main(int argc, char *argv[]) xy_src_time = t; } - bool can_estimate_xy = eph < max_eph_epv * 1.5; + bool can_estimate_xy = (eph < max_eph_epv) || use_gps_xy || use_flow; bool dist_bottom_valid = (t < sonar_valid_time + sonar_valid_timeout); @@ -767,7 +795,7 @@ int position_estimator_inav_thread_main(int argc, char *argv[]) corr_baro += offs_corr; } - /* accelerometer bias correction */ + /* accelerometer bias correction for GPS (use buffered rotation matrix) */ float accel_bias_corr[3] = { 0.0f, 0.0f, 0.0f }; if (use_gps_xy) { @@ -781,6 +809,24 @@ int position_estimator_inav_thread_main(int argc, char *argv[]) accel_bias_corr[2] -= corr_gps[2][0] * w_z_gps_p * w_z_gps_p; } + /* transform error vector from NED frame to body frame */ + for (int i = 0; i < 3; i++) { + float c = 0.0f; + + for (int j = 0; j < 3; j++) { + c += R_gps[j][i] * accel_bias_corr[j]; + } + + if (isfinite(c)) { + acc_bias[i] += c * params.w_acc_bias * dt; + } + } + + /* accelerometer bias correction for flow and baro (assume that there is no delay) */ + accel_bias_corr[0] = 0.0f; + accel_bias_corr[1] = 0.0f; + accel_bias_corr[2] = 0.0f; + if (use_flow) { accel_bias_corr[0] -= corr_flow[0] * params.w_xy_flow; accel_bias_corr[1] -= corr_flow[1] * params.w_xy_flow; @@ -796,26 +842,31 @@ int position_estimator_inav_thread_main(int argc, char *argv[]) c += att.R[j][i] * accel_bias_corr[j]; } - acc_bias[i] += c * params.w_acc_bias * dt; + if (isfinite(c)) { + acc_bias[i] += c * params.w_acc_bias * dt; + } } /* inertial filter prediction for altitude */ - inertial_filter_predict(dt, z_est); + inertial_filter_predict(dt, z_est, acc[2]); - if (!(isfinite(z_est[0]) && isfinite(z_est[1]) && isfinite(z_est[2]))) { - write_debug_log("BAD ESTIMATE AFTER Z PREDICTION", dt, x_est, y_est, z_est, x_est_prev, y_est_prev, z_est_prev, corr_acc, corr_gps, w_xy_gps_p, w_xy_gps_v); + if (!(isfinite(z_est[0]) && isfinite(z_est[1]))) { + write_debug_log("BAD ESTIMATE AFTER Z PREDICTION", dt, x_est, y_est, z_est, x_est_prev, y_est_prev, z_est_prev, acc, corr_gps, w_xy_gps_p, w_xy_gps_v); memcpy(z_est, z_est_prev, sizeof(z_est)); } /* inertial filter correction for altitude */ inertial_filter_correct(corr_baro, dt, z_est, 0, params.w_z_baro); - inertial_filter_correct(corr_gps[2][0], dt, z_est, 0, w_z_gps_p); - inertial_filter_correct(corr_acc[2], dt, z_est, 2, params.w_z_acc); - if (!(isfinite(z_est[0]) && isfinite(z_est[1]) && isfinite(z_est[2]))) { - write_debug_log("BAD ESTIMATE AFTER Z CORRECTION", dt, x_est, y_est, z_est, x_est_prev, y_est_prev, z_est_prev, corr_acc, corr_gps, w_xy_gps_p, w_xy_gps_v); + if (use_gps_z) { + epv = fminf(epv, gps.epv_m); + + inertial_filter_correct(corr_gps[2][0], dt, z_est, 0, w_z_gps_p); + } + + if (!(isfinite(z_est[0]) && isfinite(z_est[1]))) { + write_debug_log("BAD ESTIMATE AFTER Z CORRECTION", dt, x_est, y_est, z_est, x_est_prev, y_est_prev, z_est_prev, acc, corr_gps, w_xy_gps_p, w_xy_gps_v); memcpy(z_est, z_est_prev, sizeof(z_est)); - memset(corr_acc, 0, sizeof(corr_acc)); memset(corr_gps, 0, sizeof(corr_gps)); corr_baro = 0; @@ -825,25 +876,26 @@ int position_estimator_inav_thread_main(int argc, char *argv[]) if (can_estimate_xy) { /* inertial filter prediction for position */ - inertial_filter_predict(dt, x_est); - inertial_filter_predict(dt, y_est); + inertial_filter_predict(dt, x_est, acc[0]); + inertial_filter_predict(dt, y_est, acc[1]); - if (!(isfinite(x_est[0]) && isfinite(x_est[1]) && isfinite(x_est[2]) && isfinite(y_est[0]) && isfinite(y_est[1]) && isfinite(y_est[2]))) { - write_debug_log("BAD ESTIMATE AFTER PREDICTION", dt, x_est, y_est, z_est, x_est_prev, y_est_prev, z_est_prev, corr_acc, corr_gps, w_xy_gps_p, w_xy_gps_v); + if (!(isfinite(x_est[0]) && isfinite(x_est[1]) && isfinite(y_est[0]) && isfinite(y_est[1]))) { + write_debug_log("BAD ESTIMATE AFTER PREDICTION", dt, x_est, y_est, z_est, x_est_prev, y_est_prev, z_est_prev, acc, corr_gps, w_xy_gps_p, w_xy_gps_v); memcpy(x_est, x_est_prev, sizeof(x_est)); memcpy(y_est, y_est_prev, sizeof(y_est)); } /* inertial filter correction for position */ - inertial_filter_correct(corr_acc[0], dt, x_est, 2, params.w_xy_acc); - inertial_filter_correct(corr_acc[1], dt, y_est, 2, params.w_xy_acc); - if (use_flow) { + eph = fminf(eph, eph_flow); + inertial_filter_correct(corr_flow[0], dt, x_est, 1, params.w_xy_flow * w_flow); inertial_filter_correct(corr_flow[1], dt, y_est, 1, params.w_xy_flow * w_flow); } if (use_gps_xy) { + eph = fminf(eph, gps.eph_m); + inertial_filter_correct(corr_gps[0][0], dt, x_est, 0, w_xy_gps_p); inertial_filter_correct(corr_gps[1][0], dt, y_est, 0, w_xy_gps_p); @@ -853,11 +905,10 @@ int position_estimator_inav_thread_main(int argc, char *argv[]) } } - if (!(isfinite(x_est[0]) && isfinite(x_est[1]) && isfinite(x_est[2]) && isfinite(y_est[0]) && isfinite(y_est[1]) && isfinite(y_est[2]))) { - write_debug_log("BAD ESTIMATE AFTER CORRECTION", dt, x_est, y_est, z_est, x_est_prev, y_est_prev, z_est_prev, corr_acc, corr_gps, w_xy_gps_p, w_xy_gps_v); + if (!(isfinite(x_est[0]) && isfinite(x_est[1]) && isfinite(y_est[0]) && isfinite(y_est[1]))) { + write_debug_log("BAD ESTIMATE AFTER CORRECTION", dt, x_est, y_est, z_est, x_est_prev, y_est_prev, z_est_prev, acc, corr_gps, w_xy_gps_p, w_xy_gps_v); memcpy(x_est, x_est_prev, sizeof(x_est)); memcpy(y_est, y_est_prev, sizeof(y_est)); - memset(corr_acc, 0, sizeof(corr_acc)); memset(corr_gps, 0, sizeof(corr_gps)); memset(corr_flow, 0, sizeof(corr_flow)); @@ -918,8 +969,25 @@ int position_estimator_inav_thread_main(int argc, char *argv[]) } } - if (t > pub_last + pub_interval) { + if (t > pub_last + PUB_INTERVAL) { pub_last = t; + + /* push current estimate to buffer */ + est_buf[buf_ptr][0][0] = x_est[0]; + est_buf[buf_ptr][0][1] = x_est[1]; + est_buf[buf_ptr][1][0] = y_est[0]; + est_buf[buf_ptr][1][1] = y_est[1]; + est_buf[buf_ptr][2][0] = z_est[0]; + est_buf[buf_ptr][2][1] = z_est[1]; + + /* push current rotation matrix to buffer */ + memcpy(R_buf[buf_ptr], att.R, sizeof(att.R)); + + buf_ptr++; + if (buf_ptr >= EST_BUF_SIZE) { + buf_ptr = 0; + } + /* publish local position */ local_pos.xy_valid = can_estimate_xy; local_pos.v_xy_valid = can_estimate_xy; |