| public static Vector_Scale ( float vectorOut, float vectorIn, float scale2 ) : void | ||
| vectorOut | float | |
| vectorIn | float | |
| scale2 | float | |
| return | void | |
/**************************************************/
public void Drift_correction()
{
//Compensation the Roll, Pitch and Yaw drift.
float mag_heading_x;
float mag_heading_y;
float[] Scaled_Omega_P = new float[3];
float[] Scaled_Omega_I = new float[3];
float Accel_magnitude;
float Accel_weight;
float Integrator_magnitude;
float tempfloat;
//*****Roll and Pitch***************
// Calculate the magnitude of the accelerometer vector
Accel_magnitude = (float)exMath.Sqrt(Accel_Vector[0] * Accel_Vector[0] + Accel_Vector[1] * Accel_Vector[1] + Accel_Vector[2] * Accel_Vector[2]);
Accel_magnitude = Accel_magnitude / GlobalVal.gravity; // Scale to gravity.
// Dynamic weighting of accelerometer info (reliability filter)
// Weight for accelerometer info (<0.5G = 0.0, 1G = 1.0 , >1.5G = 0.0)
Accel_weight = 1 - 2 * (float)exMath.Abs(1 - Accel_magnitude); //
if (Accel_weight > 1)
{
Accel_weight = 1;
}
if (Accel_weight < 0)
{
Accel_weight = 0;
}
//#if PERFORMANCE_REPORTING == 1
// tempfloat = ((Accel_weight - 0.5) * 256.0f); //amount added was determined to give imu_health a time constant about twice the time constant of the roll/pitch drift correction
// imu_health += tempfloat;
// imu_health = constrain(imu_health,129,65405);
//#endif
Vector.Vector_Cross_Product(errorRollPitch, Accel_Vector, DCM_Matrix[2]); //adjust the ground of reference
Vector.Vector_Scale(Omega_P, errorRollPitch, Kp_ROLLPITCH * Accel_weight);
Vector.Vector_Scale(Scaled_Omega_I, errorRollPitch, Ki_ROLLPITCH * Accel_weight);
Vector.Vector_Add(Omega_I, Omega_I, Scaled_Omega_I);
//*****YAW***************
//#if USE_MAGNETOMETER==1
double[] mag = adc.getMag();
//http://code.google.com/p/sf9domahrs/
float CMx = (float)(mag[0] * exMath.Cos(this.pitch) + mag[1] * exMath.Sin(this.roll) * exMath.Sin(this.pitch) + mag[2] * exMath.Cos(this.roll) * exMath.Sin(this.pitch));
float CMy = (float)(mag[1] * exMath.Cos(this.roll) - mag[2] * exMath.Sin(this.roll));
MAG_Heading = (float)exMath.Atan(CMy / CMx);
// // We make the gyro YAW drift correction based on compass magnetic heading
//errorCourse=(DCM_Matrix[0][0]*AP_Compass.Heading_Y) - (DCM_Matrix[1][0]*AP_Compass.Heading_X); //Calculating YAW error
//Vector_Scale(errorYaw,&DCM_Matrix[2][0],errorCourse); //Applys the yaw correction to the XYZ rotation of the aircraft, depeding the position.
//Vector_Scale(&Scaled_Omega_P[0],&errorYaw[0],Kp_YAW);
//Vector_Add(Omega_P,Omega_P,Scaled_Omega_P);//Adding Proportional.
//Vector_Scale(&Scaled_Omega_I[0],&errorYaw[0],Ki_YAW);
//Vector_Add(Omega_I,Omega_I,Scaled_Omega_I);//adding integrator to the Omega_I
//#else // Use GPS Ground course to correct yaw gyro drift
//if(GPS.ground_speed>=SPEEDFILT*100) // Ground speed from GPS is in m/s
//{
//COGX = exMath.Cos(ToRad(GPS.ground_course/100.0));
//COGY = exMath.Sin(ToRad(GPS.ground_course/100.0));
COGX = (float)exMath.Cos((float)MAG_Heading);
COGY = (float)exMath.Sin((float)MAG_Heading);
errorCourse = (DCM_Matrix[0][0] * COGY) - (DCM_Matrix[1][0] * COGX); //Calculating YAW error
Vector.Vector_Scale(errorYaw, DCM_Matrix[2], errorCourse); //Applys the yaw correction to the XYZ rotation of the aircraft, depeding the position.
Vector.Vector_Scale(Scaled_Omega_P, errorYaw, Kp_YAW);
Vector.Vector_Add(Omega_P, Omega_P, Scaled_Omega_P);//Adding Proportional.
Vector.Vector_Scale(Scaled_Omega_I, errorYaw, Ki_YAW);
Vector.Vector_Add(Omega_I, Omega_I, Scaled_Omega_I);//adding integrator to the Omega_I
//}
//#endif
//// Here we will place a limit on the integrator so that the integrator cannot ever exceed half the saturation limit of the gyros
Integrator_magnitude = (float)exMath.Sqrt(Vector.Vector_Dot_Product(Omega_I, Omega_I));
if (Integrator_magnitude > exMath.ToRad(300))
{
Vector.Vector_Scale(Omega_I, Omega_I, 0.5f * exMath.ToRad(300) / Integrator_magnitude);
//#if PRINT_DEBUG != 0
// Serial.print("!!!INT:1,MAG:");
// Serial.print (ToDeg(Integrator_magnitude));
// Serial.print (",TOW:");
// Serial.print (GPS.time);
// Serial.println("***");
//#endif
}
}
/**************************************************/
public void Normalize()
{
float error = 0;
float[][] temporary = new float[3][];
temporary[0] = new float[3]; // { 0, 0, 0 };
temporary[1] = new float[3]; //{ 0, 0, 0 };
temporary[2] = new float[3]; //{ 0, 0, 0 };
//for (int i = 0; i < 3; i++)
//{
// for (int j = 0; j < 3; j++)
// {
// temporary[i][j] = new float();
// temporary[i][j] = 0.1f;
// }
//}
////temporary[0][1] = 3.2f;
float renorm = 0;
bool problem = false;
error = -1 * Vector.Vector_Dot_Product(DCM_Matrix[0], DCM_Matrix[1]) * .5f; //eq.19
Vector.Vector_Scale(temporary[0], DCM_Matrix[1], error); //eq.19
Vector.Vector_Scale(temporary[1], DCM_Matrix[0], error); //eq.19
Vector.Vector_Add(temporary[0], temporary[0], DCM_Matrix[0]); //eq.19
Vector.Vector_Add(temporary[1], temporary[1], DCM_Matrix[1]); //eq.19
Vector.Vector_Cross_Product(temporary[2], temporary[0], temporary[1]); // c= a x b //eq.20
renorm = Vector.Vector_Dot_Product(temporary[0], temporary[0]);
if (renorm < 1.5625f && renorm > 0.64f)
{
renorm = .5f * (3 - renorm); //eq.21
}
else if (renorm < 100.0f && renorm > 0.01f)
{
renorm = 1.0f / (float)exMath.Sqrt(renorm);
//#if PERFORMANCE_REPORTING == 1
// renorm_sqrt_count++;
//#endif
//#if PRINT_DEBUG != 0
// Serial.print("???SQT:1,RNM:");
// Serial.print (renorm);
// Serial.print (",ERR:");
// Serial.print (error);
// Serial.print (",TOW:");
// Serial.print (GPS.time);
// Serial.println("***");
//#endif
}
else
{
problem = true;
//#if PERFORMANCE_REPORTING == 1
// renorm_blowup_count++;
//#endif
// #if PRINT_DEBUG != 0
// Serial.print("???PRB:1,RNM:");
// Serial.print (renorm);
// Serial.print (",ERR:");
// Serial.print (error);
// Serial.print (",TOW:");
// Serial.print (GPS.time);
// Serial.println("***");
//#endif
}
Vector.Vector_Scale(DCM_Matrix[0], temporary[0], renorm);
renorm = Vector.Vector_Dot_Product(temporary[1], temporary[1]);
if (renorm < 1.5625f && renorm > 0.64f)
{
renorm = .5f * (3 - renorm); //eq.21
}
else if (renorm < 100.0f && renorm > 0.01f)
{
renorm = 1.0f / (float)exMath.Sqrt(renorm);
//#if PERFORMANCE_REPORTING == 1
// renorm_sqrt_count++;
//#endif
//#if PRINT_DEBUG != 0
// Serial.print("???SQT:2,RNM:");
// Serial.print (renorm);
// Serial.print (",ERR:");
// Serial.print (error);
// Serial.print (",TOW:");
// Serial.print (GPS.time);
// Serial.println("***");
//#endif
}
else
{
problem = true;
//#if PERFORMANCE_REPORTING == 1
// renorm_blowup_count++;
//#endif
//#if PRINT_DEBUG != 0
// Serial.print("???PRB:2,RNM:");
// Serial.print (renorm);
// Serial.print (",ERR:");
// Serial.print (error);
// Serial.print (",TOW:");
// Serial.print (GPS.time);
// Serial.println("***");
//#endif
}
Vector.Vector_Scale(DCM_Matrix[1], temporary[1], renorm);
renorm = Vector.Vector_Dot_Product(temporary[2], temporary[2]);
if (renorm < 1.5625f && renorm > 0.64f)
{
renorm = .5f * (3 - renorm); //eq.21
}
else if (renorm < 100.0f && renorm > 0.01f)
{
renorm = 1.0f / (float)exMath.Sqrt(renorm);
//#if PERFORMANCE_REPORTING == 1
// renorm_sqrt_count++;
//#endif
//#if PRINT_DEBUG != 0
// Serial.print("???SQT:3,RNM:");
// Serial.print (renorm);
// Serial.print (",ERR:");
// Serial.print (error);
// Serial.print (",TOW:");
// Serial.print (GPS.time);
// Serial.println("***");
//#endif
}
else
{
problem = true;
//#if PERFORMANCE_REPORTING == 1
// renorm_blowup_count++;
//#endif
//#if PRINT_DEBUG != 0
// Serial.print("???PRB:3,RNM:");
// Serial.print (renorm);
// Serial.print (",TOW:");
// Serial.print (GPS.time);
// Serial.println("***");
//#endif
}
Vector.Vector_Scale(DCM_Matrix[2], temporary[2], renorm);
if (problem)
{ // Our solution is blowing up and we will force back to initial condition. Hope we are not upside down!
DCM_Matrix[0][0] = 1.0f;
DCM_Matrix[0][1] = 0.0f;
DCM_Matrix[0][2] = 0.0f;
DCM_Matrix[1][0] = 0.0f;
DCM_Matrix[1][1] = 1.0f;
DCM_Matrix[1][2] = 0.0f;
DCM_Matrix[2][0] = 0.0f;
DCM_Matrix[2][1] = 0.0f;
DCM_Matrix[2][2] = 1.0f;
problem = false;
}
}
