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author | Julian Oes <julian@oes.ch> | 2014-06-09 07:48:50 +0200 |
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committer | Julian Oes <julian@oes.ch> | 2014-06-09 07:48:50 +0200 |
commit | d8f77a2b396b651410c7f28cfad84c6f8288925c (patch) | |
tree | b5fff2eff1b1522a7757ef33ca405640e70f3e4c /src/modules/position_estimator_inav/position_estimator_inav_main.c | |
parent | 13b6dffb2e719219ffccccd6681d36e695165aa5 (diff) | |
parent | 497b89165972b7c4836fcb8bc0da681d8e67fb32 (diff) | |
download | px4-firmware-d8f77a2b396b651410c7f28cfad84c6f8288925c.tar.gz px4-firmware-d8f77a2b396b651410c7f28cfad84c6f8288925c.tar.bz2 px4-firmware-d8f77a2b396b651410c7f28cfad84c6f8288925c.zip |
Merge remote-tracking branch 'px4/master' into navigator_rewrite
Conflicts:
src/modules/position_estimator_inav/position_estimator_inav_main.c
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 | 128 |
1 files changed, 102 insertions, 26 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 62845494e..62cee145e 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); @@ -199,8 +210,21 @@ int position_estimator_inav_thread_main(int argc, char *argv[]) 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; + + 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)); @@ -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) @@ -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 > max_eph_epv * 1.5f || gps.epv > max_eph_epv * 1.5f || gps.fix_type < 3) { + if (gps.eph > max_eph_epv || gps.epv > max_eph_epv || gps.fix_type < 3) { gps_valid = false; mavlink_log_info(mavlink_fd, "[inav] GPS signal lost"); } } else { - if (gps.eph < max_eph_epv && gps.epv < max_eph_epv && gps.fix_type >= 3) { + if (gps.eph < max_eph_epv * 0.7f && gps.epv < max_eph_epv * 0.7f && gps.fix_type >= 3) { gps_valid = true; reset_est = true; mavlink_log_info(mavlink_fd, "[inav] GPS signal found"); @@ -657,16 +679,22 @@ int position_estimator_inav_thread_main(int argc, char *argv[]) y_est[1] = gps.vel_e_m_s; } + /* 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; @@ -674,8 +702,8 @@ int position_estimator_inav_thread_main(int argc, char *argv[]) corr_gps[2][1] = 0.0f; } - eph = fminf(eph, gps.eph); - epv = fminf(epv, gps.epv); + /* 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); w_gps_z = min_eph_epv / fmaxf(min_eph_epv, gps.epv); @@ -717,8 +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; @@ -731,7 +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); @@ -763,7 +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) { @@ -777,6 +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; @@ -807,7 +857,12 @@ int position_estimator_inav_thread_main(int argc, char *argv[]) /* 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); + + if (use_gps_z) { + epv = fminf(epv, gps.epv); + + 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); @@ -832,11 +887,15 @@ int position_estimator_inav_thread_main(int argc, char *argv[]) /* inertial filter correction for position */ 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); + 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); @@ -910,8 +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; |