eive-obsw/mission/controller/acs/SusConverter.cpp

/*
 * SusConverter.cpp
 *
 *  Created on: 17.01.2022
 *      Author: Timon Schwarz
 */

#include "SusConverter.h"

#include <fsfw/datapoollocal/LocalPoolVariable.h>
#include <fsfw/datapoollocal/LocalPoolVector.h>
#include <fsfw/globalfunctions/math/VectorOperations.h>
#include <math.h>  //for atan2

#include <iostream>

bool SusConverter::checkSunSensorData(const uint16_t susChannel[6]) {
  if (susChannel[0] <= susChannelValueCheckLow || susChannel[0] > susChannelValueCheckHigh ||
      susChannel[0] > susChannel[GNDREF]) {
    return false;
  }
  if (susChannel[1] <= susChannelValueCheckLow || susChannel[1] > susChannelValueCheckHigh ||
      susChannel[1] > susChannel[GNDREF]) {
    return false;
  };
  if (susChannel[2] <= susChannelValueCheckLow || susChannel[2] > susChannelValueCheckHigh ||
      susChannel[2] > susChannel[GNDREF]) {
    return false;
  };
  if (susChannel[3] <= susChannelValueCheckLow || susChannel[3] > susChannelValueCheckHigh ||
      susChannel[3] > susChannel[GNDREF]) {
    return false;
  };

  susChannelValueSum =
      4 * susChannel[GNDREF] - (susChannel[0] + susChannel[1] + susChannel[2] + susChannel[3]);
  if ((susChannelValueSum < susChannelValueSumHigh) &&
      (susChannelValueSum > susChannelValueSumLow)) {
    return false;
  };
  return true;
}

void SusConverter::calcAngle(const uint16_t susChannel[6]) {
  float xout, yout;
  float s = 0.03;  // s=[mm] gap between diodes
  uint8_t d = 5;   // d=[mm] edge length of the quadratic aperture
  uint8_t h = 1;   // h=[mm] distance between diodes and aperture
  int ch0, ch1, ch2, ch3;
  // Substract measurement values from GNDREF zero current threshold
  ch0 = susChannel[GNDREF] - susChannel[0];
  ch1 = susChannel[GNDREF] - susChannel[1];
  ch2 = susChannel[GNDREF] - susChannel[2];
  ch3 = susChannel[GNDREF] - susChannel[3];

  // Calculation of x and y
  xout = ((d - s) / 2) * (ch2 - ch3 - ch0 + ch1) / (ch0 + ch1 + ch2 + ch3);  //[mm]
  yout = ((d - s) / 2) * (ch2 + ch3 - ch0 - ch1) / (ch0 + ch1 + ch2 + ch3);  //[mm]

  // Calculation of the angles
  alphaBetaRaw[0] = atan2(xout, h) * (180 / M_PI);  //[°]
  alphaBetaRaw[1] = atan2(yout, h) * (180 / M_PI);  //[°]
}

void SusConverter::calibration(const float coeffAlpha[9][10], const float coeffBeta[9][10]) {
  uint8_t index, k, l;

  // while loop iterates above all calibration cells to use the different calibration functions in
  // each cell
  k = 0;
  while (k < 3) {
    k++;
    l = 0;
    while (l < 3) {
      l++;
      // if-condition to check in which cell the data point has to be
      if ((alphaBetaRaw[0] > ((completeCellWidth * ((k - 1) / 3.)) - halfCellWidth) &&
           alphaBetaRaw[0] < ((completeCellWidth * (k / 3.)) - halfCellWidth)) &&
          (alphaBetaRaw[1] > ((completeCellWidth * ((l - 1) / 3.)) - halfCellWidth) &&
           alphaBetaRaw[1] < ((completeCellWidth * (l / 3.)) - halfCellWidth))) {
        index = (3 * (k - 1) + l) - 1;  // calculate the index of the datapoint for the right cell
        alphaBetaCalibrated[0] =
            coeffAlpha[index][0] + coeffAlpha[index][1] * alphaBetaRaw[0] +
            coeffAlpha[index][2] * alphaBetaRaw[1] +
            coeffAlpha[index][3] * alphaBetaRaw[0] * alphaBetaRaw[0] +
            coeffAlpha[index][4] * alphaBetaRaw[0] * alphaBetaRaw[1] +
            coeffAlpha[index][5] * alphaBetaRaw[1] * alphaBetaRaw[1] +
            coeffAlpha[index][6] * alphaBetaRaw[0] * alphaBetaRaw[0] * alphaBetaRaw[0] +
            coeffAlpha[index][7] * alphaBetaRaw[0] * alphaBetaRaw[0] * alphaBetaRaw[1] +
            coeffAlpha[index][8] * alphaBetaRaw[0] * alphaBetaRaw[1] * alphaBetaRaw[1] +
            coeffAlpha[index][9] * alphaBetaRaw[1] * alphaBetaRaw[1] * alphaBetaRaw[1];  //[°]
        alphaBetaCalibrated[1] =
            coeffBeta[index][0] + coeffBeta[index][1] * alphaBetaRaw[0] +
            coeffBeta[index][2] * alphaBetaRaw[1] +
            coeffBeta[index][3] * alphaBetaRaw[0] * alphaBetaRaw[0] +
            coeffBeta[index][4] * alphaBetaRaw[0] * alphaBetaRaw[1] +
            coeffBeta[index][5] * alphaBetaRaw[1] * alphaBetaRaw[1] +
            coeffBeta[index][6] * alphaBetaRaw[0] * alphaBetaRaw[0] * alphaBetaRaw[0] +
            coeffBeta[index][7] * alphaBetaRaw[0] * alphaBetaRaw[0] * alphaBetaRaw[1] +
            coeffBeta[index][8] * alphaBetaRaw[0] * alphaBetaRaw[1] * alphaBetaRaw[1] +
            coeffBeta[index][9] * alphaBetaRaw[1] * alphaBetaRaw[1] * alphaBetaRaw[1];  //[°]
      }
    }
  }
}

float* SusConverter::calculateSunVector() {
  // Calculate the normalized Sun Vector
  sunVectorSensorFrame[0] = -(tan(alphaBetaCalibrated[0] * (M_PI / 180)) /
                              (sqrt((powf(tan(alphaBetaCalibrated[0] * (M_PI / 180)), 2)) +
                                    powf(tan((alphaBetaCalibrated[1] * (M_PI / 180))), 2) + (1))));
  sunVectorSensorFrame[1] = -(tan(alphaBetaCalibrated[1] * (M_PI / 180)) /
                              (sqrt(powf((tan(alphaBetaCalibrated[0] * (M_PI / 180))), 2) +
                                    powf(tan((alphaBetaCalibrated[1] * (M_PI / 180))), 2) + (1))));
  sunVectorSensorFrame[2] =
      -(-1 / (sqrt(powf((tan(alphaBetaCalibrated[0] * (M_PI / 180))), 2) +
                   powf((tan(alphaBetaCalibrated[1] * (M_PI / 180))), 2) + (1))));

  return sunVectorSensorFrame;
}

float* SusConverter::getSunVectorSensorFrame(const uint16_t susChannel[6],
                                             const float coeffAlpha[9][10],
                                             const float coeffBeta[9][10]) {
  calcAngle(susChannel);
  calibration(coeffAlpha, coeffBeta);
  return calculateSunVector();
}