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198 lines
8.8 KiB
C++
198 lines
8.8 KiB
C++
/*
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* PtgCtrl.cpp
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*
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* Created on: 17 Jul 2022
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* Author: Robin Marquardt
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*/
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#include "PtgCtrl.h"
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#include <fsfw/globalfunctions/constants.h>
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#include <fsfw/globalfunctions/math/MatrixOperations.h>
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#include <fsfw/globalfunctions/math/QuaternionOperations.h>
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#include <fsfw/globalfunctions/math/VectorOperations.h>
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#include <fsfw/globalfunctions/sign.h>
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#include <math.h>
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#include "../util/MathOperations.h"
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PtgCtrl::PtgCtrl(AcsParameters *acsParameters_) { loadAcsParameters(acsParameters_); }
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PtgCtrl::~PtgCtrl() {}
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void PtgCtrl::loadAcsParameters(AcsParameters *acsParameters_) {
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inertiaEIVE = &(acsParameters_->inertiaEIVE);
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rwHandlingParameters = &(acsParameters_->rwHandlingParameters);
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rwMatrices = &(acsParameters_->rwMatrices);
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}
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void PtgCtrl::ptgLaw(AcsParameters::PointingLawParameters *pointingLawParameters,
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const double *qError, const double *deltaRate, const double *rwPseudoInv,
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double *torqueRws) {
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//------------------------------------------------------------------------------------------------
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// Compute gain matrix K and P matrix
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//------------------------------------------------------------------------------------------------
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double om = pointingLawParameters->om;
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double zeta = pointingLawParameters->zeta;
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double qErrorMin = pointingLawParameters->qiMin;
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double omMax = pointingLawParameters->omMax;
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double cInt = 2 * om * zeta;
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double kInt = 2 * pow(om, 2);
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double qErrorLaw[3] = {0, 0, 0};
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for (int i = 0; i < 3; i++) {
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if (abs(qError[i]) < qErrorMin) {
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qErrorLaw[i] = qErrorMin;
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} else {
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qErrorLaw[i] = abs(qError[i]);
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}
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}
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double qErrorLawNorm = VectorOperations<double>::norm(qErrorLaw, 3);
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double gain1 = cInt * omMax / qErrorLawNorm;
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double gainVector[3] = {0, 0, 0};
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VectorOperations<double>::mulScalar(qErrorLaw, gain1, gainVector, 3);
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double gainMatrixDiagonal[3][3] = {{0, 0, 0}, {0, 0, 0}, {0, 0, 0}};
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double gainMatrix[3][3] = {{0, 0, 0}, {0, 0, 0}, {0, 0, 0}};
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gainMatrixDiagonal[0][0] = gainVector[0];
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gainMatrixDiagonal[1][1] = gainVector[1];
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gainMatrixDiagonal[2][2] = gainVector[2];
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MatrixOperations<double>::multiply(*gainMatrixDiagonal, *(inertiaEIVE->inertiaMatrix),
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*gainMatrix, 3, 3, 3);
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// Inverse of gainMatrix
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double gainMatrixInverse[3][3] = {{0, 0, 0}, {0, 0, 0}, {0, 0, 0}};
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gainMatrixInverse[0][0] = 1 / gainMatrix[0][0];
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gainMatrixInverse[1][1] = 1 / gainMatrix[1][1];
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gainMatrixInverse[2][2] = 1 / gainMatrix[2][2];
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double pMatrix[3][3] = {{0, 0, 0}, {0, 0, 0}, {0, 0, 0}};
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MatrixOperations<double>::multiply(*gainMatrixInverse, *(inertiaEIVE->inertiaMatrix), *pMatrix, 3,
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3, 3);
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MatrixOperations<double>::multiplyScalar(*pMatrix, kInt, *pMatrix, 3, 3);
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//------------------------------------------------------------------------------------------------
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// Torque Calculations for the reaction wheels
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//------------------------------------------------------------------------------------------------
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double pError[3] = {0, 0, 0};
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MatrixOperations<double>::multiply(*pMatrix, qError, pError, 3, 3, 1);
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double pErrorSign[3] = {0, 0, 0};
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for (int i = 0; i < 3; i++) {
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if (abs(pError[i]) > 1) {
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pErrorSign[i] = sign(pError[i]);
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} else {
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pErrorSign[i] = pError[i];
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}
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}
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// Torque for quaternion error
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double torqueQuat[3] = {0, 0, 0};
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MatrixOperations<double>::multiply(*gainMatrix, pErrorSign, torqueQuat, 3, 3, 1);
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VectorOperations<double>::mulScalar(torqueQuat, -1, torqueQuat, 3);
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// Torque for rate error
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double torqueRate[3] = {0, 0, 0};
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MatrixOperations<double>::multiply(*(inertiaEIVE->inertiaMatrix), deltaRate, torqueRate, 3, 3, 1);
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VectorOperations<double>::mulScalar(torqueRate, cInt, torqueRate, 3);
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VectorOperations<double>::mulScalar(torqueRate, -1, torqueRate, 3);
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// Final commanded Torque for every reaction wheel
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double torque[3] = {0, 0, 0};
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VectorOperations<double>::add(torqueRate, torqueQuat, torque, 3);
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MatrixOperations<double>::multiply(rwPseudoInv, torque, torqueRws, 4, 3, 1);
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VectorOperations<double>::mulScalar(torqueRws, -1, torqueRws, 4);
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}
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void PtgCtrl::ptgDesaturation(AcsParameters::PointingLawParameters *pointingLawParameters,
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double *magFieldEst, bool magFieldEstValid, double *satRate,
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int32_t *speedRw0, int32_t *speedRw1, int32_t *speedRw2,
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int32_t *speedRw3, double *mgtDpDes) {
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if (!(magFieldEstValid) || !(pointingLawParameters->desatOn)) {
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mgtDpDes[0] = 0;
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mgtDpDes[1] = 0;
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mgtDpDes[2] = 0;
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return;
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}
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// calculating momentum of satellite and momentum of reaction wheels
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double speedRws[4] = {(double)*speedRw0, (double)*speedRw1, (double)*speedRw2, (double)*speedRw3};
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double momentumRwU[4] = {0, 0, 0, 0}, momentumRw[3] = {0, 0, 0};
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VectorOperations<double>::mulScalar(speedRws, rwHandlingParameters->inertiaWheel, momentumRwU, 4);
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MatrixOperations<double>::multiply(*(rwMatrices->alignmentMatrix), momentumRwU, momentumRw, 3, 4,
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1);
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double momentumSat[3] = {0, 0, 0}, momentumTotal[3] = {0, 0, 0};
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MatrixOperations<double>::multiply(*(inertiaEIVE->inertiaMatrix), satRate, momentumSat, 3, 3, 1);
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VectorOperations<double>::add(momentumSat, momentumRw, momentumTotal, 3);
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// calculating momentum error
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double deltaMomentum[3] = {0, 0, 0};
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VectorOperations<double>::subtract(momentumTotal, pointingLawParameters->desatMomentumRef,
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deltaMomentum, 3);
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// resulting magnetic dipole command
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double crossMomentumMagField[3] = {0, 0, 0};
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VectorOperations<double>::cross(deltaMomentum, magFieldEst, crossMomentumMagField);
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double normMag = VectorOperations<double>::norm(magFieldEst, 3), factor = 0;
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factor = (pointingLawParameters->deSatGainFactor) / normMag;
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VectorOperations<double>::mulScalar(crossMomentumMagField, factor, mgtDpDes, 3);
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}
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void PtgCtrl::ptgNullspace(AcsParameters::PointingLawParameters *pointingLawParameters,
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const int32_t *speedRw0, const int32_t *speedRw1,
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const int32_t *speedRw2, const int32_t *speedRw3, double *rwTrqNs) {
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double speedRws[4] = {(double)*speedRw0, (double)*speedRw1, (double)*speedRw2, (double)*speedRw3};
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double wheelMomentum[4] = {0, 0, 0, 0};
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double rpmOffset[4] = {1, 1, 1, -1}, factor = 350 * 2 * Math::PI / 60;
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// Conversion to [rad/s] for further calculations
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VectorOperations<double>::mulScalar(rpmOffset, factor, rpmOffset, 4);
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VectorOperations<double>::mulScalar(speedRws, 2 * Math::PI / 60, speedRws, 4);
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double diffRwSpeed[4] = {0, 0, 0, 0};
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VectorOperations<double>::subtract(speedRws, rpmOffset, diffRwSpeed, 4);
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VectorOperations<double>::mulScalar(diffRwSpeed, rwHandlingParameters->inertiaWheel,
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wheelMomentum, 4);
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double gainNs = pointingLawParameters->gainNullspace;
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double nullSpaceMatrix[4][4] = {{0, 0, 0}, {0, 0, 0}, {0, 0, 0}, {0, 0, 0}};
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MathOperations<double>::vecTransposeVecMatrix(rwMatrices->nullspace, rwMatrices->nullspace,
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*nullSpaceMatrix, 4);
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MatrixOperations<double>::multiply(*nullSpaceMatrix, wheelMomentum, rwTrqNs, 4, 4, 1);
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VectorOperations<double>::mulScalar(rwTrqNs, gainNs, rwTrqNs, 4);
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VectorOperations<double>::mulScalar(rwTrqNs, -1, rwTrqNs, 4);
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}
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void PtgCtrl::rwAntistiction(ACS::SensorValues *sensorValues, double *torqueCommand) {
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bool rwAvailable[4] = {
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(sensorValues->rw1Set.state.value && sensorValues->rw1Set.state.isValid()),
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(sensorValues->rw2Set.state.value && sensorValues->rw2Set.state.isValid()),
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(sensorValues->rw3Set.state.value && sensorValues->rw3Set.state.isValid()),
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(sensorValues->rw4Set.state.value && sensorValues->rw4Set.state.isValid())};
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int32_t omegaRw[4] = {sensorValues->rw1Set.currSpeed.value, sensorValues->rw2Set.currSpeed.value,
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sensorValues->rw3Set.currSpeed.value, sensorValues->rw4Set.currSpeed.value};
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for (uint8_t i = 0; i < 4; i++) {
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if (rwAvailable[i]) {
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if (torqueMemory[i] != 0) {
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if ((omegaRw[i] * torqueMemory[i]) > rwHandlingParameters->stictionReleaseSpeed) {
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torqueMemory[i] = 0;
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} else {
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torqueCommand[i] = torqueMemory[i] * rwHandlingParameters->stictionTorque;
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}
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} else {
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if ((omegaRw[i] < rwHandlingParameters->stictionSpeed) &&
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(omegaRw[i] > -rwHandlingParameters->stictionSpeed)) {
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if (omegaRw[i] < omegaMemory[i]) {
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torqueMemory[i] = -1;
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} else {
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torqueMemory[i] = 1;
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}
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torqueCommand[i] = torqueMemory[i] * rwHandlingParameters->stictionTorque;
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}
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}
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} else {
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torqueMemory[i] = 0;
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}
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omegaMemory[i] = omegaRw[i];
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}
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}
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