diff options
Diffstat (limited to 'src/modules/att_pos_estimator_ekf/KalmanNav.cpp')
| -rw-r--r-- | src/modules/att_pos_estimator_ekf/KalmanNav.cpp | 825 |
1 files changed, 0 insertions, 825 deletions
diff --git a/src/modules/att_pos_estimator_ekf/KalmanNav.cpp b/src/modules/att_pos_estimator_ekf/KalmanNav.cpp deleted file mode 100644 index ecca04dd7..000000000 --- a/src/modules/att_pos_estimator_ekf/KalmanNav.cpp +++ /dev/null @@ -1,825 +0,0 @@ -/**************************************************************************** - * - * Copyright (c) 2012, 2013 PX4 Development Team. All rights reserved. - * - * Redistribution and use in source and binary forms, with or without - * modification, are permitted provided that the following conditions - * are met: - * - * 1. Redistributions of source code must retain the above copyright - * notice, this list of conditions and the following disclaimer. - * 2. Redistributions in binary form must reproduce the above copyright - * notice, this list of conditions and the following disclaimer in - * the documentation and/or other materials provided with the - * distribution. - * 3. Neither the name PX4 nor the names of its contributors may be - * used to endorse or promote products derived from this software - * without specific prior written permission. - * - * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS - * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT - * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS - * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE - * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, - * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, - * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS - * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED - * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT - * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN - * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE - * POSSIBILITY OF SUCH DAMAGE. - * - ****************************************************************************/ - -/** - * @file KalmanNav.cpp - * - * Kalman filter navigation code - */ - -#include <poll.h> - -#include "KalmanNav.hpp" -#include <systemlib/err.h> -#include <geo/geo.h> - -// constants -// Titterton pg. 52 -static const float omega = 7.2921150e-5f; // earth rotation rate, rad/s -static const float R0 = 6378137.0f; // earth radius, m -static const float g0 = 9.806f; // standard gravitational accel. m/s^2 -static const int8_t ret_ok = 0; // no error in function -static const int8_t ret_error = -1; // error occurred - -KalmanNav::KalmanNav(SuperBlock *parent, const char *name) : - SuperBlock(parent, name), - // ekf matrices - F(9, 9), - G(9, 6), - P(9, 9), - P0(9, 9), - V(6, 6), - // attitude measurement ekf matrices - HAtt(4, 9), - RAtt(4, 4), - // position measurement ekf matrices - HPos(6, 9), - RPos(6, 6), - // attitude representations - C_nb(), - q(), - // subscriptions - _sensors(&getSubscriptions(), ORB_ID(sensor_combined), 5), // limit to 200 Hz - _gps(&getSubscriptions(), ORB_ID(vehicle_gps_position), 100), // limit to 10 Hz - _param_update(&getSubscriptions(), ORB_ID(parameter_update), 1000), // limit to 1 Hz - // publications - _pos(&getPublications(), ORB_ID(vehicle_global_position)), - _localPos(&getPublications(), ORB_ID(vehicle_local_position)), - _att(&getPublications(), ORB_ID(vehicle_attitude)), - // timestamps - _pubTimeStamp(hrt_absolute_time()), - _predictTimeStamp(hrt_absolute_time()), - _attTimeStamp(hrt_absolute_time()), - _outTimeStamp(hrt_absolute_time()), - // frame count - _navFrames(0), - // miss counts - _miss(0), - // accelerations - fN(0), fE(0), fD(0), - // state - phi(0), theta(0), psi(0), - vN(0), vE(0), vD(0), - lat(0), lon(0), alt(0), - lat0(0), lon0(0), alt0(0), - // parameters for ground station - _vGyro(this, "V_GYRO"), - _vAccel(this, "V_ACCEL"), - _rMag(this, "R_MAG"), - _rGpsVel(this, "R_GPS_VEL"), - _rGpsPos(this, "R_GPS_POS"), - _rGpsAlt(this, "R_GPS_ALT"), - _rPressAlt(this, "R_PRESS_ALT"), - _rAccel(this, "R_ACCEL"), - _magDip(this, "ENV_MAG_DIP"), - _magDec(this, "ENV_MAG_DEC"), - _g(this, "ENV_G"), - _faultPos(this, "FAULT_POS"), - _faultAtt(this, "FAULT_ATT"), - _attitudeInitialized(false), - _positionInitialized(false), - _attitudeInitCounter(0) -{ - using namespace math; - - // initial state covariance matrix - P0 = Matrix::identity(9) * 0.01f; - P = P0; - - // initial state - phi = 0.0f; - theta = 0.0f; - psi = 0.0f; - vN = 0.0f; - vE = 0.0f; - vD = 0.0f; - lat = 0.0f; - lon = 0.0f; - alt = 0.0f; - - // initialize rotation quaternion with a single raw sensor measurement - _sensors.update(); - q = init( - _sensors.accelerometer_m_s2[0], - _sensors.accelerometer_m_s2[1], - _sensors.accelerometer_m_s2[2], - _sensors.magnetometer_ga[0], - _sensors.magnetometer_ga[1], - _sensors.magnetometer_ga[2]); - - // initialize dcm - C_nb = Dcm(q); - - // HPos is constant - HPos(0, 3) = 1.0f; - HPos(1, 4) = 1.0f; - HPos(2, 6) = 1.0e7f * M_RAD_TO_DEG_F; - HPos(3, 7) = 1.0e7f * M_RAD_TO_DEG_F; - HPos(4, 8) = 1.0f; - HPos(5, 8) = 1.0f; - - // initialize all parameters - updateParams(); -} - -math::Quaternion KalmanNav::init(float ax, float ay, float az, float mx, float my, float mz) -{ - float initialRoll, initialPitch; - float cosRoll, sinRoll, cosPitch, sinPitch; - float magX, magY; - float initialHdg, cosHeading, sinHeading; - - initialRoll = atan2(-ay, -az); - initialPitch = atan2(ax, -az); - - cosRoll = cosf(initialRoll); - sinRoll = sinf(initialRoll); - cosPitch = cosf(initialPitch); - sinPitch = sinf(initialPitch); - - magX = mx * cosPitch + my * sinRoll * sinPitch + mz * cosRoll * sinPitch; - - magY = my * cosRoll - mz * sinRoll; - - initialHdg = atan2f(-magY, magX); - - cosRoll = cosf(initialRoll * 0.5f); - sinRoll = sinf(initialRoll * 0.5f); - - cosPitch = cosf(initialPitch * 0.5f); - sinPitch = sinf(initialPitch * 0.5f); - - cosHeading = cosf(initialHdg * 0.5f); - sinHeading = sinf(initialHdg * 0.5f); - - float q0 = cosRoll * cosPitch * cosHeading + sinRoll * sinPitch * sinHeading; - float q1 = sinRoll * cosPitch * cosHeading - cosRoll * sinPitch * sinHeading; - float q2 = cosRoll * sinPitch * cosHeading + sinRoll * cosPitch * sinHeading; - float q3 = cosRoll * cosPitch * sinHeading - sinRoll * sinPitch * cosHeading; - - return math::Quaternion(q0, q1, q2, q3); - -} - -void KalmanNav::update() -{ - using namespace math; - - struct pollfd fds[1]; - fds[0].fd = _sensors.getHandle(); - fds[0].events = POLLIN; - - // poll for new data - int ret = poll(fds, 1, 1000); - - if (ret < 0) { - // XXX this is seriously bad - should be an emergency - return; - - } else if (ret == 0) { // timeout - return; - } - - // get new timestamp - uint64_t newTimeStamp = hrt_absolute_time(); - - // check updated subscriptions - if (_param_update.updated()) updateParams(); - - bool gpsUpdate = _gps.updated(); - bool sensorsUpdate = _sensors.updated(); - - // get new information from subscriptions - // this clears update flag - updateSubscriptions(); - - // initialize attitude when sensors online - if (!_attitudeInitialized && sensorsUpdate) { - if (correctAtt() == ret_ok) _attitudeInitCounter++; - - if (_attitudeInitCounter > 100) { - warnx("initialized EKF attitude\n"); - warnx("phi: %8.4f, theta: %8.4f, psi: %8.4f\n", - double(phi), double(theta), double(psi)); - _attitudeInitialized = true; - } - } - - // initialize position when gps received - if (!_positionInitialized && - _attitudeInitialized && // wait for attitude first - gpsUpdate && - _gps.fix_type > 2 - //&& _gps.counter_pos_valid > 10 - ) { - vN = _gps.vel_n_m_s; - vE = _gps.vel_e_m_s; - vD = _gps.vel_d_m_s; - setLatDegE7(_gps.lat); - setLonDegE7(_gps.lon); - setAltE3(_gps.alt); - // set reference position for - // local position - lat0 = lat; - lon0 = lon; - alt0 = alt; - // XXX map_projection has internal global - // states that multiple things could change, - // should make map_projection take reference - // lat/lon and not have init - map_projection_init(lat0, lon0); - _positionInitialized = true; - warnx("initialized EKF state with GPS\n"); - warnx("vN: %8.4f, vE: %8.4f, vD: %8.4f, lat: %8.4f, lon: %8.4f, alt: %8.4f\n", - double(vN), double(vE), double(vD), - lat, lon, double(alt)); - } - - // prediction step - // using sensors timestamp so we can account for packet lag - float dt = (_sensors.timestamp - _predictTimeStamp) / 1.0e6f; - //printf("dt: %15.10f\n", double(dt)); - _predictTimeStamp = _sensors.timestamp; - - // don't predict if time greater than a second - if (dt < 1.0f) { - predictState(dt); - predictStateCovariance(dt); - // count fast frames - _navFrames += 1; - } - - // count times 100 Hz rate isn't met - if (dt > 0.01f) _miss++; - - // gps correction step - if (_positionInitialized && gpsUpdate) { - correctPos(); - } - - // attitude correction step - if (_attitudeInitialized // initialized - && sensorsUpdate // new data - && _sensors.timestamp - _attTimeStamp > 1e6 / 50 // 50 Hz - ) { - _attTimeStamp = _sensors.timestamp; - correctAtt(); - } - - // publication - if (newTimeStamp - _pubTimeStamp > 1e6 / 50) { // 50 Hz - _pubTimeStamp = newTimeStamp; - - updatePublications(); - } - - // output - if (newTimeStamp - _outTimeStamp > 10e6) { // 0.1 Hz - _outTimeStamp = newTimeStamp; - //printf("nav: %4d Hz, miss #: %4d\n", - // _navFrames / 10, _miss / 10); - _navFrames = 0; - _miss = 0; - } -} - -void KalmanNav::updatePublications() -{ - using namespace math; - - // global position publication - _pos.timestamp = _pubTimeStamp; - _pos.time_gps_usec = _gps.timestamp_position; - _pos.valid = true; - _pos.lat = getLatDegE7(); - _pos.lon = getLonDegE7(); - _pos.alt = float(alt); - _pos.relative_alt = float(alt); // TODO, make relative - _pos.vx = vN; - _pos.vy = vE; - _pos.vz = vD; - _pos.yaw = psi; - - // local position publication - float x; - float y; - bool landed = alt < (alt0 + 0.1); // XXX improve? - map_projection_project(lat, lon, &x, &y); - _localPos.timestamp = _pubTimeStamp; - _localPos.xy_valid = true; - _localPos.z_valid = true; - _localPos.v_xy_valid = true; - _localPos.v_z_valid = true; - _localPos.x = x; - _localPos.y = y; - _localPos.z = alt0 - alt; - _localPos.vx = vN; - _localPos.vy = vE; - _localPos.vz = vD; - _localPos.yaw = psi; - _localPos.xy_global = true; - _localPos.z_global = true; - _localPos.ref_timestamp = _pubTimeStamp; - _localPos.ref_lat = getLatDegE7(); - _localPos.ref_lon = getLonDegE7(); - _localPos.ref_alt = 0; - _localPos.landed = landed; - - // attitude publication - _att.timestamp = _pubTimeStamp; - _att.roll = phi; - _att.pitch = theta; - _att.yaw = psi; - _att.rollspeed = _sensors.gyro_rad_s[0]; - _att.pitchspeed = _sensors.gyro_rad_s[1]; - _att.yawspeed = _sensors.gyro_rad_s[2]; - // TODO, add gyro offsets to filter - _att.rate_offsets[0] = 0.0f; - _att.rate_offsets[1] = 0.0f; - _att.rate_offsets[2] = 0.0f; - - for (int i = 0; i < 3; i++) for (int j = 0; j < 3; j++) - _att.R[i][j] = C_nb(i, j); - - for (int i = 0; i < 4; i++) _att.q[i] = q(i); - - _att.R_valid = true; - _att.q_valid = true; - - // selectively update publications, - // do NOT call superblock do-all method - if (_positionInitialized) { - _pos.update(); - _localPos.update(); - } - - if (_attitudeInitialized) - _att.update(); -} - -int KalmanNav::predictState(float dt) -{ - using namespace math; - - // trig - float sinL = sinf(lat); - float cosL = cosf(lat); - float cosLSing = cosf(lat); - - // prevent singularity - if (fabsf(cosLSing) < 0.01f) { - if (cosLSing > 0) cosLSing = 0.01; - else cosLSing = -0.01; - } - - // attitude prediction - if (_attitudeInitialized) { - Vector3 w(_sensors.gyro_rad_s); - - // attitude - q = q + q.derivative(w) * dt; - - // renormalize quaternion if needed - if (fabsf(q.norm() - 1.0f) > 1e-4f) { - q = q.unit(); - } - - // C_nb update - C_nb = Dcm(q); - - // euler update - EulerAngles euler(C_nb); - phi = euler.getPhi(); - theta = euler.getTheta(); - psi = euler.getPsi(); - - // specific acceleration in nav frame - Vector3 accelB(_sensors.accelerometer_m_s2); - Vector3 accelN = C_nb * accelB; - fN = accelN(0); - fE = accelN(1); - fD = accelN(2); - } - - // position prediction - if (_positionInitialized) { - // neglects angular deflections in local gravity - // see Titerton pg. 70 - float R = R0 + float(alt); - float LDot = vN / R; - float lDot = vE / (cosLSing * R); - float rotRate = 2 * omega + lDot; - - // XXX position prediction using speed - float vNDot = fN - vE * rotRate * sinL + - vD * LDot; - float vDDot = fD - vE * rotRate * cosL - - vN * LDot + _g.get(); - float vEDot = fE + vN * rotRate * sinL + - vDDot * rotRate * cosL; - - // rectangular integration - vN += vNDot * dt; - vE += vEDot * dt; - vD += vDDot * dt; - lat += double(LDot * dt); - lon += double(lDot * dt); - alt += double(-vD * dt); - } - - return ret_ok; -} - -int KalmanNav::predictStateCovariance(float dt) -{ - using namespace math; - - // trig - float sinL = sinf(lat); - float cosL = cosf(lat); - float cosLSq = cosL * cosL; - float tanL = tanf(lat); - - // prepare for matrix - float R = R0 + float(alt); - float RSq = R * R; - - // F Matrix - // Titterton pg. 291 - - F(0, 1) = -(omega * sinL + vE * tanL / R); - F(0, 2) = vN / R; - F(0, 4) = 1.0f / R; - F(0, 6) = -omega * sinL; - F(0, 8) = -vE / RSq; - - F(1, 0) = omega * sinL + vE * tanL / R; - F(1, 2) = omega * cosL + vE / R; - F(1, 3) = -1.0f / R; - F(1, 8) = vN / RSq; - - F(2, 0) = -vN / R; - F(2, 1) = -omega * cosL - vE / R; - F(2, 4) = -tanL / R; - F(2, 6) = -omega * cosL - vE / (R * cosLSq); - F(2, 8) = vE * tanL / RSq; - - F(3, 1) = -fD; - F(3, 2) = fE; - F(3, 3) = vD / R; - F(3, 4) = -2 * (omega * sinL + vE * tanL / R); - F(3, 5) = vN / R; - F(3, 6) = -vE * (2 * omega * cosL + vE / (R * cosLSq)); - F(3, 8) = (vE * vE * tanL - vN * vD) / RSq; - - F(4, 0) = fD; - F(4, 2) = -fN; - F(4, 3) = 2 * omega * sinL + vE * tanL / R; - F(4, 4) = (vN * tanL + vD) / R; - F(4, 5) = 2 * omega * cosL + vE / R; - F(4, 6) = 2 * omega * (vN * cosL - vD * sinL) + - vN * vE / (R * cosLSq); - F(4, 8) = -vE * (vN * tanL + vD) / RSq; - - F(5, 0) = -fE; - F(5, 1) = fN; - F(5, 3) = -2 * vN / R; - F(5, 4) = -2 * (omega * cosL + vE / R); - F(5, 6) = 2 * omega * vE * sinL; - F(5, 8) = (vN * vN + vE * vE) / RSq; - - F(6, 3) = 1 / R; - F(6, 8) = -vN / RSq; - - F(7, 4) = 1 / (R * cosL); - F(7, 6) = vE * tanL / (R * cosL); - F(7, 8) = -vE / (cosL * RSq); - - F(8, 5) = -1; - - // G Matrix - // Titterton pg. 291 - G(0, 0) = -C_nb(0, 0); - G(0, 1) = -C_nb(0, 1); - G(0, 2) = -C_nb(0, 2); - G(1, 0) = -C_nb(1, 0); - G(1, 1) = -C_nb(1, 1); - G(1, 2) = -C_nb(1, 2); - G(2, 0) = -C_nb(2, 0); - G(2, 1) = -C_nb(2, 1); - G(2, 2) = -C_nb(2, 2); - - G(3, 3) = C_nb(0, 0); - G(3, 4) = C_nb(0, 1); - G(3, 5) = C_nb(0, 2); - G(4, 3) = C_nb(1, 0); - G(4, 4) = C_nb(1, 1); - G(4, 5) = C_nb(1, 2); - G(5, 3) = C_nb(2, 0); - G(5, 4) = C_nb(2, 1); - G(5, 5) = C_nb(2, 2); - - // continuous predictioon equations - // for discrte time EKF - // http://en.wikipedia.org/wiki/Extended_Kalman_filter - P = P + (F * P + P * F.transpose() + G * V * G.transpose()) * dt; - - return ret_ok; -} - -int KalmanNav::correctAtt() -{ - using namespace math; - - // trig - float cosPhi = cosf(phi); - float cosTheta = cosf(theta); - // float cosPsi = cosf(psi); - float sinPhi = sinf(phi); - float sinTheta = sinf(theta); - // float sinPsi = sinf(psi); - - // mag predicted measurement - // choosing some typical magnetic field properties, - // TODO dip/dec depend on lat/ lon/ time - //float dip = _magDip.get() / M_RAD_TO_DEG_F; // dip, inclination with level - float dec = _magDec.get() / M_RAD_TO_DEG_F; // declination, clockwise rotation from north - - // compensate roll and pitch, but not yaw - // XXX take the vectors out of the C_nb matrix to avoid singularities - math::Dcm C_rp(math::EulerAngles(phi, theta, 0.0f));//C_nb.transpose(); - - // mag measurement - Vector3 magBody(_sensors.magnetometer_ga); - - // transform to earth frame - Vector3 magNav = C_rp * magBody; - - // calculate error between estimate and measurement - // apply declination correction for true heading as well. - float yMag = -atan2f(magNav(1),magNav(0)) - psi - dec; - if (yMag > M_PI_F) yMag -= 2*M_PI_F; - if (yMag < -M_PI_F) yMag += 2*M_PI_F; - - // accel measurement - Vector3 zAccel(_sensors.accelerometer_m_s2); - float accelMag = zAccel.norm(); - zAccel = zAccel.unit(); - - // ignore accel correction when accel mag not close to g - Matrix RAttAdjust = RAtt; - - bool ignoreAccel = fabsf(accelMag - _g.get()) > 1.1f; - - if (ignoreAccel) { - RAttAdjust(1, 1) = 1.0e10; - RAttAdjust(2, 2) = 1.0e10; - RAttAdjust(3, 3) = 1.0e10; - - } else { - //printf("correcting attitude with accel\n"); - } - - // accel predicted measurement - Vector3 zAccelHat = (C_nb.transpose() * Vector3(0, 0, -_g.get())).unit(); - - // calculate residual - Vector y(4); - y(0) = yMag; - y(1) = zAccel(0) - zAccelHat(0); - y(2) = zAccel(1) - zAccelHat(1); - y(3) = zAccel(2) - zAccelHat(2); - - // HMag - HAtt(0, 2) = 1; - - // HAccel - HAtt(1, 1) = cosTheta; - HAtt(2, 0) = -cosPhi * cosTheta; - HAtt(2, 1) = sinPhi * sinTheta; - HAtt(3, 0) = sinPhi * cosTheta; - HAtt(3, 1) = cosPhi * sinTheta; - - // compute correction - // http://en.wikipedia.org/wiki/Extended_Kalman_filter - Matrix S = HAtt * P * HAtt.transpose() + RAttAdjust; // residual covariance - Matrix K = P * HAtt.transpose() * S.inverse(); - Vector xCorrect = K * y; - - // check correciton is sane - for (size_t i = 0; i < xCorrect.getRows(); i++) { - float val = xCorrect(i); - - if (isnan(val) || isinf(val)) { - // abort correction and return - warnx("numerical failure in att correction\n"); - // reset P matrix to P0 - P = P0; - return ret_error; - } - } - - // correct state - if (!ignoreAccel) { - phi += xCorrect(PHI); - theta += xCorrect(THETA); - } - - psi += xCorrect(PSI); - - // attitude also affects nav velocities - if (_positionInitialized) { - vN += xCorrect(VN); - vE += xCorrect(VE); - vD += xCorrect(VD); - } - - // update state covariance - // http://en.wikipedia.org/wiki/Extended_Kalman_filter - P = P - K * HAtt * P; - - // fault detection - float beta = y.dot(S.inverse() * y); - - if (beta > _faultAtt.get()) { - warnx("fault in attitude: beta = %8.4f", (double)beta); - warnx("y:"); y.print(); - } - - // update quaternions from euler - // angle correction - q = Quaternion(EulerAngles(phi, theta, psi)); - - return ret_ok; -} - -int KalmanNav::correctPos() -{ - using namespace math; - - // residual - Vector y(6); - y(0) = _gps.vel_n_m_s - vN; - y(1) = _gps.vel_e_m_s - vE; - y(2) = double(_gps.lat) - double(lat) * 1.0e7 * M_RAD_TO_DEG; - y(3) = double(_gps.lon) - double(lon) * 1.0e7 * M_RAD_TO_DEG; - y(4) = _gps.alt / 1.0e3f - alt; - y(5) = _sensors.baro_alt_meter - alt; - - // compute correction - // http://en.wikipedia.org/wiki/Extended_Kalman_filter - Matrix S = HPos * P * HPos.transpose() + RPos; // residual covariance - Matrix K = P * HPos.transpose() * S.inverse(); - Vector xCorrect = K * y; - - // check correction is sane - for (size_t i = 0; i < xCorrect.getRows(); i++) { - float val = xCorrect(i); - - if (!isfinite(val)) { - // abort correction and return - warnx("numerical failure in gps correction\n"); - // fallback to GPS - vN = _gps.vel_n_m_s; - vE = _gps.vel_e_m_s; - vD = _gps.vel_d_m_s; - setLatDegE7(_gps.lat); - setLonDegE7(_gps.lon); - setAltE3(_gps.alt); - // reset P matrix to P0 - P = P0; - return ret_error; - } - } - - // correct state - vN += xCorrect(VN); - vE += xCorrect(VE); - vD += xCorrect(VD); - lat += double(xCorrect(LAT)); - lon += double(xCorrect(LON)); - alt += xCorrect(ALT); - - // update state covariance - // http://en.wikipedia.org/wiki/Extended_Kalman_filter - P = P - K * HPos * P; - - // fault detetcion - float beta = y.dot(S.inverse() * y); - - static int counter = 0; - if (beta > _faultPos.get() && (counter % 10 == 0)) { - warnx("fault in gps: beta = %8.4f", (double)beta); - warnx("Y/N: vN: %8.4f, vE: %8.4f, lat: %8.4f, lon: %8.4f, alt: %8.4f, baro: %8.4f", - double(y(0) / sqrtf(RPos(0, 0))), - double(y(1) / sqrtf(RPos(1, 1))), - double(y(2) / sqrtf(RPos(2, 2))), - double(y(3) / sqrtf(RPos(3, 3))), - double(y(4) / sqrtf(RPos(4, 4))), - double(y(5) / sqrtf(RPos(5, 5)))); - } - counter++; - - return ret_ok; -} - -void KalmanNav::updateParams() -{ - using namespace math; - using namespace control; - SuperBlock::updateParams(); - - // gyro noise - V(0, 0) = _vGyro.get(); // gyro x, rad/s - V(1, 1) = _vGyro.get(); // gyro y - V(2, 2) = _vGyro.get(); // gyro z - - // accel noise - V(3, 3) = _vAccel.get(); // accel x, m/s^2 - V(4, 4) = _vAccel.get(); // accel y - V(5, 5) = _vAccel.get(); // accel z - - // magnetometer noise - float noiseMin = 1e-6f; - float noiseMagSq = _rMag.get() * _rMag.get(); - - if (noiseMagSq < noiseMin) noiseMagSq = noiseMin; - - RAtt(0, 0) = noiseMagSq; // normalized direction - - // accelerometer noise - float noiseAccelSq = _rAccel.get() * _rAccel.get(); - - // bound noise to prevent singularities - if (noiseAccelSq < noiseMin) noiseAccelSq = noiseMin; - - RAtt(1, 1) = noiseAccelSq; // normalized direction - RAtt(2, 2) = noiseAccelSq; - RAtt(3, 3) = noiseAccelSq; - - // gps noise - float R = R0 + float(alt); - float cosLSing = cosf(lat); - - // prevent singularity - if (fabsf(cosLSing) < 0.01f) { - if (cosLSing > 0) cosLSing = 0.01; - else cosLSing = -0.01; - } - - float noiseVel = _rGpsVel.get(); - float noiseLatDegE7 = 1.0e7f * M_RAD_TO_DEG_F * _rGpsPos.get() / R; - float noiseLonDegE7 = noiseLatDegE7 / cosLSing; - float noiseGpsAlt = _rGpsAlt.get(); - float noisePressAlt = _rPressAlt.get(); - - // bound noise to prevent singularities - if (noiseVel < noiseMin) noiseVel = noiseMin; - - if (noiseLatDegE7 < noiseMin) noiseLatDegE7 = noiseMin; - - if (noiseLonDegE7 < noiseMin) noiseLonDegE7 = noiseMin; - - if (noiseGpsAlt < noiseMin) noiseGpsAlt = noiseMin; - - if (noisePressAlt < noiseMin) noisePressAlt = noiseMin; - - RPos(0, 0) = noiseVel * noiseVel; // vn - RPos(1, 1) = noiseVel * noiseVel; // ve - RPos(2, 2) = noiseLatDegE7 * noiseLatDegE7; // lat - RPos(3, 3) = noiseLonDegE7 * noiseLonDegE7; // lon - RPos(4, 4) = noiseGpsAlt * noiseGpsAlt; // h - RPos(5, 5) = noisePressAlt * noisePressAlt; // h - // XXX, note that RPos depends on lat, so updateParams should - // be called if lat changes significantly -} |