mirror of https://github.com/ArduPilot/ardupilot
117 lines
5.6 KiB
C++
117 lines
5.6 KiB
C++
#include "AP_Baro.h"
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#include <AP_AHRS/AP_AHRS.h>
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#if HAL_BARO_WIND_COMP_ENABLED
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// table of compensation coefficient parameters for one baro
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const AP_Param::GroupInfo AP_Baro::WindCoeff::var_info[] = {
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// @Param: ENABLE
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// @DisplayName: Wind coefficient enable
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// @Description: This enables the use of wind coefficients for barometer compensation
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// @Values: 0:Disabled, 1:Enabled
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// @User: Advanced
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AP_GROUPINFO_FLAGS("ENABLE", 1, WindCoeff, enable, 0, AP_PARAM_FLAG_ENABLE),
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// @Param: FWD
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// @DisplayName: Pressure error coefficient in positive X direction (forward)
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// @Description: This is the ratio of static pressure error to dynamic pressure generated by a positive wind relative velocity along the X body axis. If the baro height estimate rises during forwards flight, then this will be a negative number. Multirotors can use this feature only if using EKF3 and if the EK3_DRAG_BCOEF_X and EK3_DRAG_BCOEF_Y parameters have been tuned.
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// @Range: -1.0 1.0
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// @Increment: 0.05
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// @User: Advanced
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AP_GROUPINFO("FWD", 2, WindCoeff, xp, 0.0),
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// @Param: BCK
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// @DisplayName: Pressure error coefficient in negative X direction (backwards)
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// @Description: This is the ratio of static pressure error to dynamic pressure generated by a negative wind relative velocity along the X body axis. If the baro height estimate rises during backwards flight, then this will be a negative number. Multirotors can use this feature only if using EKF3 and if the EK3_DRAG_BCOEF_X and EK3_DRAG_BCOEF_Y parameters have been tuned.
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// @Range: -1.0 1.0
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// @Increment: 0.05
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// @User: Advanced
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AP_GROUPINFO("BCK", 3, WindCoeff, xn, 0.0),
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// @Param: RGT
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// @DisplayName: Pressure error coefficient in positive Y direction (right)
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// @Description: This is the ratio of static pressure error to dynamic pressure generated by a positive wind relative velocity along the Y body axis. If the baro height estimate rises during sideways flight to the right, then this should be a negative number. Multirotors can use this feature only if using EKF3 and if the EK3_DRAG_BCOEF_X and EK3_DRAG_BCOEF_Y parameters have been tuned.
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// @Range: -1.0 1.0
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// @Increment: 0.05
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// @User: Advanced
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AP_GROUPINFO("RGT", 4, WindCoeff, yp, 0.0),
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// @Param: LFT
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// @DisplayName: Pressure error coefficient in negative Y direction (left)
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// @Description: This is the ratio of static pressure error to dynamic pressure generated by a negative wind relative velocity along the Y body axis. If the baro height estimate rises during sideways flight to the left, then this should be a negative number. Multirotors can use this feature only if using EKF3 and if the EK3_DRAG_BCOEF_X and EK3_DRAG_BCOEF_Y parameters have been tuned.
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// @Range: -1.0 1.0
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// @Increment: 0.05
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// @User: Advanced
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AP_GROUPINFO("LFT", 5, WindCoeff, yn, 0.0),
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// @Param: UP
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// @DisplayName: Pressure error coefficient in positive Z direction (up)
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// @Description: This is the ratio of static pressure error to dynamic pressure generated by a positive wind relative velocity along the Z body axis. If the baro height estimate rises above truth height during climbing flight (or forward flight with a high forwards lean angle), then this should be a negative number. Multirotors can use this feature only if using EKF3 and if the EK3_DRAG_BCOEF_X and EK3_DRAG_BCOEF_Y parameters have been tuned.
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// @Range: -1.0 1.0
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// @Increment: 0.05
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// @User: Advanced
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AP_GROUPINFO("UP", 6, WindCoeff, zp, 0.0),
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// @Param: DN
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// @DisplayName: Pressure error coefficient in negative Z direction (down)
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// @Description: This is the ratio of static pressure error to dynamic pressure generated by a negative wind relative velocity along the Z body axis. If the baro height estimate rises above truth height during descending flight (or forward flight with a high backwards lean angle, eg braking manoeuvre), then this should be a negative number. Multirotors can use this feature only if using EKF3 and if the EK3_DRAG_BCOEF_X and EK3_DRAG_BCOEF_Y parameters have been tuned.
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// @Range: -1.0 1.0
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// @Increment: 0.05
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// @User: Advanced
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AP_GROUPINFO("DN", 7, WindCoeff, zn, 0.0),
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AP_GROUPEND
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};
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/*
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return pressure correction for wind based on GND_WCOEF parameters
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*/
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float AP_Baro::wind_pressure_correction(uint8_t instance)
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{
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const WindCoeff &wcoef = sensors[instance].wind_coeff;
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if (!wcoef.enable) {
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return 0;
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}
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// correct for static pressure position errors
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Vector3f airspeed_vec_bf;
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if (!AP::ahrs().airspeed_vector_true(airspeed_vec_bf)) {
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return 0;
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}
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float error = 0.0;
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const float kp = 0.5 * SSL_AIR_DENSITY * get_air_density_ratio();
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const float sqxp = sq(airspeed_vec_bf.x) * kp;
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const float sqyp = sq(airspeed_vec_bf.y) * kp;
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const float sqzp = sq(airspeed_vec_bf.z) * kp;
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if (is_positive(airspeed_vec_bf.x)) {
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sensors[instance].dynamic_pressure.x = sqxp;
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error += wcoef.xp * sqxp;
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} else {
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sensors[instance].dynamic_pressure.x = -sqxp;
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error += wcoef.xn * sqxp;
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}
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if (is_positive(airspeed_vec_bf.y)) {
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sensors[instance].dynamic_pressure.y = sqyp;
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error += wcoef.yp * sqyp;
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} else {
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sensors[instance].dynamic_pressure.y = -sqyp;
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error += wcoef.yn * sqyp;
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}
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if (is_positive(airspeed_vec_bf.z)) {
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sensors[instance].dynamic_pressure.z = sqzp;
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error += wcoef.zp * sqzp;
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} else {
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sensors[instance].dynamic_pressure.z = -sqzp;
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error += wcoef.zn * sqzp;
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}
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return error;
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}
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#endif // HAL_BARO_WIND_COMP_ENABLED
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