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/***********************************************/
/**
* @file observationMiscPodVariational.cpp
*
* @brief Precise Orbit data (variational equations).
*
* @author Torsten Mayer-Guerr
* @date 2015-06-02
*
*/
/***********************************************/
#include "base/import.h"
#include "base/polynomial.h"
#include "files/fileInstrument.h"
#include "misc/observation/variationalEquationFromFile.h"
#include "observationMiscPodVariational.h"
/***********************************************/
ObservationMiscPodVariational::ObservationMiscPodVariational(Config &config)
{
try
{
FileName fileNamePod;
FileName fileNameVariational;
UInt integrationDegree;
renameDeprecatedConfig(config, "representation", "parametrizationGravity", date2time(2020, 6, 3));
renameDeprecatedConfig(config, "parameter", "parametrizationAcceleration", date2time(2020, 6, 3));
if(readConfigSequence(config, "rightHandSide", Config::MUSTSET, "", "input for observation vectors"))
{
readConfig(config, "inputfileOrbit", fileNamePod, Config::MUSTSET, "", "kinematic positions as observations");
endSequence(config);
}
readConfig(config, "inputfileVariational", fileNameVariational, Config::MUSTSET, "", "approximate position and integrated state matrix");
readConfig(config, "ephemerides", ephemerides, Config::OPTIONAL, "jpl", "");
readConfig(config, "parametrizationGravity", parameterGravity, Config::DEFAULT, "", "gravity field parametrization");
readConfig(config, "parametrizationAcceleration", parameterAcceleration, Config::DEFAULT, "", "orbit force parameters");
readConfig(config, "integrationDegree", integrationDegree, Config::DEFAULT, "7", "integration of forces by polynomial approximation of degree n");
readConfig(config, "interpolationDegree", interpolationDegree, Config::DEFAULT, "7", "orbit interpolation by polynomial approximation of degree n");
readConfig(config, "accelerateComputation", accelerateComputation, Config::DEFAULT, "0", "acceleration of computation by transforming the observations");
if(isCreateSchema(config)) return;
// =======================
// init
// ----
podFile.open(fileNamePod);
countArc = podFile.arcCount();
variationalEquation.open(fileNameVariational, parameterGravity, parameterAcceleration, std::vector<Time>(), ephemerides, integrationDegree);
// =======================
// count parameters
// ----------------
countAParameter = variationalEquation.parameterCount();
gravityCount = variationalEquation.parameterCountGravity();
idxGravity = 0;
idxState = gravityCount;
}
catch(std::exception &e)
{
GROOPS_RETHROW(e)
}
}
/***********************************************/
Bool ObservationMiscPodVariational::setInterval(const Time &timeStart, const Time &timeEnd)
{
try
{
Bool change = FALSE;
change = parameterGravity->setInterval(timeStart, timeEnd) || change;
change = parameterAcceleration->setInterval(timeStart, timeEnd) || change;
if(!change)
return FALSE;
variationalEquation.computeIndices();
// count parameters
// ----------------
countAParameter = variationalEquation.parameterCount();
gravityCount = variationalEquation.parameterCountGravity();
idxGravity = 0;
idxState = gravityCount;
return change;
}
catch(std::exception &e)
{
GROOPS_RETHROW(e)
}
}
/***********************************************/
void ObservationMiscPodVariational::parameterName(std::vector<ParameterName> &name) const
{
try
{
variationalEquation.parameterName(name);
}
catch(std::exception &e)
{
GROOPS_RETHROW(e)
}
}
/***********************************************/
ObservationMiscPod::Arc ObservationMiscPodVariational::computeArc(UInt arcNo, CovariancePodPtr covPod)
{
try
{
// read POD observations
// ---------------------
OrbitArc pod = podFile.readArc(arcNo);
const UInt obsCount = 3*pod.size();
if(obsCount == 0)
return Arc();
const std::vector<Time> timePod = pod.times();
VariationalEquationFromFile::ObservationEquation eqn = variationalEquation.integrateArc(timePod.at(0), timePod.back(), TRUE/*position*/, FALSE/*velocity*/);
Polynomial polynomial(eqn.times, interpolationDegree);
// kinematic orbit observations
// ----------------------------
Matrix l(obsCount, 1);
for(UInt k=0; k<obsCount/3; k++)
{
l(3*k+0,0) = pod.at(k).position.x();
l(3*k+1,0) = pod.at(k).position.y();
l(3*k+2,0) = pod.at(k).position.z();
}
l -= polynomial.interpolate(timePod, eqn.pos0, 3);
// =============================================
Matrix A;
if(!accelerateComputation || (l.rows() <= eqn.PosDesign.rows()))
{
// design matrix
// -------------
A = polynomial.interpolate(timePod, eqn.PosDesign, 3);
// decorrelation
// -------------
if(covPod)
covPod->decorrelate(arcNo, pod, {l, A});
}
else
{
A = eqn.PosDesign;
Matrix B = polynomial.interpolate(timePod, identityMatrix(A.rows()), 3);
if(covPod)
covPod->decorrelate(arcNo, pod, {l, B});
const Vector tau = QR_decomposition(B);
QTransMult(B, tau, l);
triangularMult(1., B.row(0, B.columns()), A);
}
// =============================================
Arc observationArc;
observationArc.l = l;
observationArc.A = A;
observationArc.times = timePod;
observationArc.pod = pod;
return observationArc;
}
catch(std::exception &e)
{
GROOPS_RETHROW(e)
}
}
/***********************************************/
|
