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/***********************************************/
/**
* @file graceSstSpecialEvents.cpp
*
* @brief Detect GRACE events (eclipse, sun intrusion into star camera box).
*
* @author Saniya Behzadpour
* @date 2018-08-08
*
*/
/***********************************************/
// Latex documentation
#define DOCSTRING docstring
static const char *docstring = R"(
Time-indexing deterministic signals in the GRACE K-Band measurements caused by Sun intrusions
into the star camera baffles of GRACE-A and eclipse transits of the satellites.
The events are determined by satellites' position (\configFile{inputfileOrbit1/2}{instrument})
and orientation (\configFile{inputfileStarCamera1/2}{instrument}). Each type of event is represented
by its mid-interval point per orbit revolution and is reported in \configFile{outputfileEvents}{instrument}.
The waveform of each event is nearly constant within one month and can be approximated by a polynomial.
For the purpose of gravity field recovery, each waveform is parameterized by a polynomial and the coefficients
of this polynomial are estimated as additional instrument calibration parameters in a common adjustment
with all other instrument, satellite, and gravity field parameters,
see \configClass{parametrizationSatelliteTracking:specialEffect}{parametrizationSatelliteTrackingType:specialEffect}.
)";
/***********************************************/
#include "programs/program.h"
#include "files/fileInstrument.h"
#include "files/fileMatrix.h"
#include "classes/ephemerides/ephemerides.h"
#include "classes/eclipse/eclipse.h"
/***** CLASS ***********************************/
/** @brief Detect GRACE events (eclipse, sun intrusion into star camera box).
* @ingroup programsGroup */
class GraceSstSpecialEvents
{
public:
void run(Config &config, Parallel::CommunicatorPtr comm);
};
GROOPS_REGISTER_PROGRAM(GraceSstSpecialEvents, SINGLEPROCESS, "Detect GRACE events (eclipse, sun intrusion into star camera box).", Grace)
/***********************************************/
void GraceSstSpecialEvents::run(Config &config, Parallel::CommunicatorPtr /*comm*/)
{
try
{
FileName fileNameOut, fileNameOutInterval;
FileName fileNameOrbit1, fileNameOrbit2;
FileName fileNameStarCamera1, fileNameStarCamera2;
EphemeridesPtr ephemerides;
EclipsePtr eclipse;
Double marginBefore, marginAfter;
readConfig(config, "outputfileEvents", fileNameOut, Config::MUSTSET, "", "");
readConfig(config, "outputfileIntervals", fileNameOutInterval, Config::OPTIONAL, "", "");
readConfig(config, "inputfileOrbit1", fileNameOrbit1, Config::MUSTSET, "", "");
readConfig(config, "inputfileOrbit2", fileNameOrbit2, Config::MUSTSET, "", "");
readConfig(config, "inputfileStarCamera1", fileNameStarCamera1, Config::MUSTSET, "", "");
readConfig(config, "inputfileStarCamera2", fileNameStarCamera2, Config::MUSTSET, "", "");
readConfig(config, "ephemerides", ephemerides, Config::MUSTSET, "", "");
readConfig(config, "eclipse", eclipse, Config::MUSTSET, "", "");
readConfig(config, "marginLeft", marginBefore, Config::DEFAULT, "100", "margin size (on both sides) [seconds]");
readConfig(config, "marginRight", marginAfter, Config::DEFAULT, "100", "margin size (on both sides) [seconds]");
if(isCreateSchema(config)) return;
// =============================================
logStatus<<"read star camera and orbit data"<<Log::endl;
OrbitArc orbit1 = InstrumentFile::read(fileNameOrbit1);
OrbitArc orbit2 = InstrumentFile::read(fileNameOrbit2);
StarCameraArc starCamera1 = InstrumentFile::read(fileNameStarCamera1);
Arc::checkSynchronized({orbit1, orbit2, starCamera1});
MiscValueArc arc;
for(UInt i=0; i<orbit1.size(); i++)
{
// eclipse transit
// ---------------
const Double delta = eclipse->factor(orbit2.at(i).time, orbit2.at(i).position, ephemerides)
- eclipse->factor(orbit1.at(i).time, orbit1.at(i).position, ephemerides);
if(fabs(delta) > 1e-10)
{
MiscValueEpoch epoch;
epoch.time = orbit1.at(i).time;
epoch.value = (delta>0) ? 1 : 2;
arc.push_back(epoch);
continue;
}
// star camera box
// ----------------
const Vector3d direction = normalize(orbit1.at(i).position - ephemerides->position(orbit1.at(i).time, Ephemerides::SUN)); // from sun to satellite
const Vector3d normP = rotaryZ(Angle(180*DEG2RAD)).rotate(rotaryX(Angle(+135*DEG2RAD)).rotate(starCamera1.at(i).rotary.inverseRotate(direction))); // Primary
const Vector3d normS = rotaryZ(Angle(180*DEG2RAD)).rotate(rotaryX(Angle(-135*DEG2RAD)).rotate(starCamera1.at(i).rotary.inverseRotate(direction))); // Secondary
const Vector3d norm = (normP.z() < normS.z()) ? normP : normS;
const Double foreAft = RAD2DEG * std::atan(norm.x()/norm.z());
const Double upDown = RAD2DEG * std::atan(norm.y()/norm.z());
const Double width = 0.6;
if((std::fabs(foreAft) < 10+width) && (std::fabs(upDown) < 8.5+width) && ((std::fabs(std::fabs(foreAft)-10) < width) || (std::fabs(std::fabs(upDown)-8.5) < width)))
{
MiscValueEpoch epoch;
epoch.time = orbit1.at(i).time;
if (std::fabs(std::fabs(upDown)-8.5) < width)
{
if (upDown>0)
epoch.value = ((foreAft>0) ? 5 : 6);
else
epoch.value = ((foreAft>0) ? 7 : 8);
}
else
epoch.value = ((foreAft>0) ? 3 : 4);
arc.push_back(epoch);
}
}
// =============================================
// Replace by mid epoch
// --------------------
MiscValueArc arcNew;
Double type = -1;
Time timeStart;
for(UInt i=0; i<arc.size(); i++)
{
if((arc.at(i).value != type) || (arc.at(i).time > arc.at(i-1).time+seconds2time(10*60)))
{
arcNew.push_back(arc.at(i));
timeStart = arc.at(i).time;
type = arc.at(i).value;
}
if(arc.at(i).value == type)
arcNew.at(arcNew.size()-1).time = timeStart + 0.5*(arc.at(i).time-timeStart);
}
logStatus<<"write events to file<"<<fileNameOut<<">"<<Log::endl;
InstrumentFile::write(fileNameOut, arcNew);
Arc::printStatistics(arcNew);
// =============================================
MiscValueArc arcInterval;
std::vector<Time> time = orbit1.times();
UInt idx = 0;
for(UInt idEpoch=0; idEpoch<time.size(); idEpoch++)
{
// find event
while((idx < arcNew.size()) && (arcNew.at(idx).time+seconds2time(marginAfter) < time.at(idEpoch)))
idx++;
if(idx >= arcNew.size())
break;
if(time.at(idEpoch) < arcNew.at(idx).time-seconds2time(marginBefore))
continue;
MiscValueEpoch epoch;
epoch.time = time.at(idEpoch);
epoch.value = arcNew.at(idx).value;
arcInterval.push_back(epoch);
}//for
logStatus<<"write intervals to file<"<<fileNameOutInterval<<">"<<Log::endl;
InstrumentFile::write(fileNameOutInterval, arcInterval);
Arc::printStatistics(arcInterval);
// =============================================
}
catch(std::exception &e)
{
GROOPS_RETHROW(e)
}
}
/***********************************************/
|
