[5828] | 1 | /* -------------------------------------------------------------------------
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| 2 | * BKG NTRIP Client
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| 3 | * -------------------------------------------------------------------------
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| 4 | *
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| 5 | * Class: t_pppFilter
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| 6 | *
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| 7 | * Purpose: Filter Adjustment
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| 8 | *
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| 9 | * Author: L. Mervart
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| 10 | *
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| 11 | * Created: 29-Jul-2014
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| 12 | *
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| 13 | * Changes:
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| 14 | *
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| 15 | * -----------------------------------------------------------------------*/
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| 16 |
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[5743] | 17 | #include <iostream>
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| 18 | #include <iomanip>
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| 19 | #include <cmath>
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| 20 | #include <newmat.h>
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| 21 | #include <newmatio.h>
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[5748] | 22 | #include <newmatap.h>
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[5743] | 23 |
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[5810] | 24 | #include "pppFilter.h"
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[5808] | 25 | #include "bncutils.h"
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[5810] | 26 | #include "pppParlist.h"
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| 27 | #include "pppObsPool.h"
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| 28 | #include "pppStation.h"
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[5747] | 29 | #include "pppClient.h"
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[5743] | 30 |
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[5814] | 31 | using namespace BNC_PPP;
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[5743] | 32 | using namespace std;
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| 33 |
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| 34 | // Constructor
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| 35 | ////////////////////////////////////////////////////////////////////////////
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[5810] | 36 | t_pppFilter::t_pppFilter() {
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[5743] | 37 | _parlist = 0;
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| 38 | }
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| 39 |
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| 40 | // Destructor
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| 41 | ////////////////////////////////////////////////////////////////////////////
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[5810] | 42 | t_pppFilter::~t_pppFilter() {
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[5743] | 43 | delete _parlist;
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| 44 | }
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| 45 |
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| 46 | // Process Single Epoch
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| 47 | ////////////////////////////////////////////////////////////////////////////
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[5826] | 48 | t_irc t_pppFilter::processEpoch(t_pppObsPool* obsPool) {
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[5743] | 49 |
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| 50 | _numSat = 0;
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| 51 |
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| 52 | if (!_parlist) {
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[5810] | 53 | _parlist = new t_pppParlist();
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[5743] | 54 | }
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| 55 |
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| 56 | // Vector of all Observations
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| 57 | // --------------------------
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[5826] | 58 | t_pppObsPool::t_epoch* epoch = obsPool->lastEpoch();
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[5743] | 59 | if (!epoch) {
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[5747] | 60 | return failure;
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[5743] | 61 | }
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[5916] | 62 | vector<t_pppSatObs*>& allObs = epoch->obsVector();
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[5743] | 63 |
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| 64 | // Time of the Epoch
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| 65 | // -----------------
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| 66 | _epoTime = epoch->epoTime();
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[6011] | 67 |
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| 68 | if (!_firstEpoTime.valid()) {
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| 69 | _firstEpoTime = _epoTime;
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| 70 | }
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| 71 |
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[5743] | 72 | // Set Parameters
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| 73 | // --------------
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[5916] | 74 | _parlist->set(_epoTime, allObs);
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[5810] | 75 | const vector<t_pppParam*>& params = _parlist->params();
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[5743] | 76 |
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| 77 | // Status Vector, Variance-Covariance Matrix
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| 78 | // -----------------------------------------
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| 79 | ColumnVector xFltOld = _xFlt;
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| 80 | SymmetricMatrix QFltOld = _QFlt;
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| 81 |
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| 82 | _QFlt.ReSize(_parlist->nPar()); _QFlt = 0.0;
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| 83 | _xFlt.ReSize(_parlist->nPar()); _xFlt = 0.0;
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| 84 | _x0.ReSize(_parlist->nPar()); _x0 = 0.0;
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| 85 |
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[6005] | 86 | for (unsigned ii = 0; ii < params.size(); ii++) {
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[5810] | 87 | const t_pppParam* par1 = params[ii];
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[5743] | 88 |
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| 89 | _x0[ii] = par1->x0();
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| 90 |
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| 91 | int iOld = par1->indexOld();
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| 92 | if (iOld < 0) {
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[6008] | 93 | _QFlt[ii][ii] = par1->sigma0() * par1->sigma0(); // new parameter
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[5743] | 94 | }
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| 95 | else {
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[6008] | 96 | _QFlt[ii][ii] = QFltOld[iOld][iOld] + par1->noise() * par1->noise();
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| 97 | _xFlt[ii] = xFltOld[iOld];
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[6004] | 98 | for (unsigned jj = 0; jj < ii; jj++) {
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[5810] | 99 | const t_pppParam* par2 = params[jj];
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[6003] | 100 | int jOld = par2->indexOld();
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[5743] | 101 | if (jOld >= 0) {
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| 102 | _QFlt[ii][jj] = QFltOld(iOld+1,jOld+1);
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| 103 | }
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| 104 | }
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| 105 | }
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| 106 | }
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| 107 |
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[6008] | 108 | predictCovCrdPart(QFltOld);
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[6005] | 109 |
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[5916] | 110 | // Process Satellite Systems separately
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| 111 | // ------------------------------------
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| 112 | for (unsigned iSys = 0; iSys < OPT->systems().size(); iSys++) {
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| 113 | char system = OPT->systems()[iSys];
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| 114 | vector<t_pppSatObs*> obsVector;
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| 115 | for (unsigned jj = 0; jj < allObs.size(); jj++) {
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| 116 | if (allObs[jj]->prn().system() == system) {
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| 117 | obsVector.push_back(allObs[jj]);
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[5743] | 118 | }
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| 119 | }
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[5916] | 120 | if ( processSystem(OPT->LCs(system), obsVector) != success ) {
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| 121 | return failure;
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| 122 | }
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[5743] | 123 | }
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[5916] | 124 |
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| 125 | cmpDOP(allObs);
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[5743] | 126 |
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[5877] | 127 | _parlist->printResult(_epoTime, _QFlt, _xFlt);
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[5743] | 128 |
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[5747] | 129 | return success;
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[5743] | 130 | }
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| 131 |
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| 132 | // Process Selected LCs
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| 133 | ////////////////////////////////////////////////////////////////////////////
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[5916] | 134 | t_irc t_pppFilter::processSystem(const vector<t_lc::type>& LCs,
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| 135 | const vector<t_pppSatObs*>& obsVector) {
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[5743] | 136 |
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| 137 | LOG.setf(ios::fixed);
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| 138 |
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| 139 | // Detect Cycle Slips
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| 140 | // ------------------
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[5747] | 141 | if (detectCycleSlips(LCs, obsVector) != success) {
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| 142 | return failure;
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[5743] | 143 | }
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| 144 |
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| 145 | ColumnVector xSav = _xFlt;
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| 146 | SymmetricMatrix QSav = _QFlt;
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| 147 | string epoTimeStr = string(_epoTime);
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[5810] | 148 | const vector<t_pppParam*>& params = _parlist->params();
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[5743] | 149 | unsigned maxObs = obsVector.size() * LCs.size();
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| 150 |
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| 151 | // Outlier Detection Loop
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| 152 | // ----------------------
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| 153 | for (unsigned iOutlier = 0; iOutlier < maxObs; iOutlier++) {
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| 154 |
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| 155 | if (iOutlier > 0) {
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| 156 | _xFlt = xSav;
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| 157 | _QFlt = QSav;
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| 158 | }
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| 159 |
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| 160 | // First-Design Matrix, Terms Observed-Computed, Weight Matrix
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| 161 | // -----------------------------------------------------------
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| 162 | Matrix AA(maxObs, _parlist->nPar());
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| 163 | ColumnVector ll(maxObs);
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[5922] | 164 | DiagonalMatrix PP(maxObs); PP = 0.0;
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[5743] | 165 |
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| 166 | int iObs = -1;
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[5922] | 167 | vector<t_pppSatObs*> usedObs;
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| 168 | vector<t_lc::type> usedTypes;
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[5743] | 169 | for (unsigned ii = 0; ii < obsVector.size(); ii++) {
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[5819] | 170 | t_pppSatObs* obs = obsVector[ii];
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[5743] | 171 | if (!obs->outlier()) {
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| 172 | for (unsigned jj = 0; jj < LCs.size(); jj++) {
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| 173 | const t_lc::type tLC = LCs[jj];
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| 174 | ++iObs;
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| 175 | usedObs.push_back(obs);
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| 176 | usedTypes.push_back(tLC);
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| 177 | for (unsigned iPar = 0; iPar < params.size(); iPar++) {
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[5810] | 178 | const t_pppParam* par = params[iPar];
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[5743] | 179 | AA[iObs][iPar] = par->partial(_epoTime, obs, tLC);
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| 180 | }
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[5922] | 181 | ll[iObs] = obs->obsValue(tLC) - obs->cmpValue(tLC) - DotProduct(_x0, AA.Row(iObs+1));
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| 182 | PP[iObs] = 1.0 / (obs->sigma(tLC) * obs->sigma(tLC));
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[5743] | 183 | }
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| 184 | }
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| 185 | }
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| 186 |
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| 187 | // Check number of observations, truncate matrices
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| 188 | // -----------------------------------------------
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[6036] | 189 | if (iObs == -1) {
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[5747] | 190 | return failure;
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[5743] | 191 | }
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| 192 | AA = AA.Rows(1, iObs+1);
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| 193 | ll = ll.Rows(1, iObs+1);
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[5922] | 194 | PP = PP.SymSubMatrix(1, iObs+1);
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[5743] | 195 |
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| 196 | // Kalman update step
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| 197 | // ------------------
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[5866] | 198 | kalman(AA, ll, PP, _QFlt, _xFlt);
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[5743] | 199 |
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| 200 | // Check Residuals
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| 201 | // ---------------
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| 202 | ColumnVector vv = AA * _xFlt - ll;
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| 203 | double maxOutlier = 0.0;
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| 204 | int maxOutlierIndex = -1;
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[5916] | 205 | t_lc::type maxOutlierLC = t_lc::dummy;
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| 206 | for (unsigned ii = 0; ii < usedObs.size(); ii++) {
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| 207 | const t_lc::type tLC = usedTypes[ii];
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| 208 | double res = fabs(vv[ii]);
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| 209 | if (res > usedObs[ii]->maxRes(tLC)) {
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| 210 | if (res > fabs(maxOutlier)) {
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| 211 | maxOutlier = vv[ii];
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| 212 | maxOutlierIndex = ii;
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| 213 | maxOutlierLC = tLC;
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[5743] | 214 | }
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| 215 | }
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| 216 | }
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| 217 |
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| 218 | // Mark outlier or break outlier detection loop
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| 219 | // --------------------------------------------
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| 220 | if (maxOutlierIndex > -1) {
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[5819] | 221 | t_pppSatObs* obs = usedObs[maxOutlierIndex];
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[5810] | 222 | t_pppParam* par = 0;
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[5743] | 223 | LOG << epoTimeStr << " Outlier " << t_lc::toString(maxOutlierLC) << ' '
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| 224 | << obs->prn().toString() << ' '
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| 225 | << setw(8) << setprecision(4) << maxOutlier << endl;
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| 226 | for (unsigned iPar = 0; iPar < params.size(); iPar++) {
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[5810] | 227 | t_pppParam* hlp = params[iPar];
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| 228 | if (hlp->type() == t_pppParam::amb && hlp->prn() == obs->prn() &&
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[5743] | 229 | hlp->tLC() == usedTypes[maxOutlierIndex]) {
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| 230 | par = hlp;
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| 231 | }
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| 232 | }
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| 233 | if (par) {
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| 234 | if (par->ambResetCandidate()) {
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| 235 | resetAmb(par->prn(), obsVector, &QSav, &xSav);
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| 236 | }
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| 237 | else {
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| 238 | par->setAmbResetCandidate();
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| 239 | obs->setOutlier();
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| 240 | }
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| 241 | }
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| 242 | else {
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| 243 | obs->setOutlier();
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| 244 | }
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| 245 | }
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| 246 |
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| 247 | // Print Residuals
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| 248 | // ---------------
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| 249 | else {
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| 250 | for (unsigned jj = 0; jj < LCs.size(); jj++) {
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| 251 | for (unsigned ii = 0; ii < usedObs.size(); ii++) {
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| 252 | const t_lc::type tLC = usedTypes[ii];
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[5819] | 253 | t_pppSatObs* obs = usedObs[ii];
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[5743] | 254 | if (tLC == LCs[jj]) {
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| 255 | obs->setRes(tLC, vv[ii]);
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[5748] | 256 | LOG << epoTimeStr << " RES "
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| 257 | << left << setw(3) << t_lc::toString(tLC) << right << ' '
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| 258 | << obs->prn().toString() << ' '
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| 259 | << setw(8) << setprecision(4) << vv[ii] << endl;
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[5743] | 260 | }
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| 261 | }
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| 262 | }
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| 263 | break;
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| 264 | }
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| 265 | }
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| 266 |
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[5747] | 267 | return success;
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[5743] | 268 | }
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| 269 |
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| 270 | // Cycle-Slip Detection
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| 271 | ////////////////////////////////////////////////////////////////////////////
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[5810] | 272 | t_irc t_pppFilter::detectCycleSlips(const vector<t_lc::type>& LCs,
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[5916] | 273 | const vector<t_pppSatObs*>& obsVector) {
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[5743] | 274 |
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| 275 | const double SLIP = 20.0; // slip threshold
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| 276 | string epoTimeStr = string(_epoTime);
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[5810] | 277 | const vector<t_pppParam*>& params = _parlist->params();
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[5743] | 278 |
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| 279 | for (unsigned ii = 0; ii < LCs.size(); ii++) {
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| 280 | const t_lc::type& tLC = LCs[ii];
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| 281 | if (t_lc::includesPhase(tLC)) {
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| 282 | for (unsigned iObs = 0; iObs < obsVector.size(); iObs++) {
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[5819] | 283 | const t_pppSatObs* obs = obsVector[iObs];
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[5743] | 284 |
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| 285 | // Check set Slips and Jump Counters
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| 286 | // ---------------------------------
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| 287 | bool slip = false;
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| 288 |
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| 289 | if (obs->slip()) {
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| 290 | LOG << "cycle slip set (obs)" << endl;;
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| 291 | slip = true;
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| 292 | }
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| 293 |
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| 294 | if (_slips[obs->prn()]._obsSlipCounter != -1 &&
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| 295 | _slips[obs->prn()]._obsSlipCounter != obs->slipCounter()) {
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| 296 | LOG << "cycle slip set (obsSlipCounter)" << endl;
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| 297 | slip = true;
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| 298 | }
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| 299 | _slips[obs->prn()]._obsSlipCounter = obs->slipCounter();
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| 300 |
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| 301 | if (_slips[obs->prn()]._biasJumpCounter != -1 &&
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| 302 | _slips[obs->prn()]._biasJumpCounter != obs->biasJumpCounter()) {
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| 303 | LOG << "cycle slip set (biasJumpCounter)" << endl;
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| 304 | slip = true;
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| 305 | }
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| 306 | _slips[obs->prn()]._biasJumpCounter = obs->biasJumpCounter();
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| 307 |
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| 308 | // Slip Set
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| 309 | // --------
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| 310 | if (slip) {
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| 311 | resetAmb(obs->prn(), obsVector);
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| 312 | }
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| 313 |
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| 314 | // Check Pre-Fit Residuals
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| 315 | // -----------------------
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| 316 | else {
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| 317 | ColumnVector AA(params.size());
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| 318 | for (unsigned iPar = 0; iPar < params.size(); iPar++) {
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[5810] | 319 | const t_pppParam* par = params[iPar];
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[5743] | 320 | AA[iPar] = par->partial(_epoTime, obs, tLC);
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| 321 | }
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| 322 |
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| 323 | double ll = obs->obsValue(tLC) - obs->cmpValue(tLC) - DotProduct(_x0, AA);
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| 324 | double vv = DotProduct(AA, _xFlt) - ll;
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| 325 |
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| 326 | if (fabs(vv) > SLIP) {
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| 327 | LOG << epoTimeStr << " cycle slip detected " << t_lc::toString(tLC) << ' '
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| 328 | << obs->prn().toString() << ' ' << setw(8) << setprecision(4) << vv << endl;
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| 329 | resetAmb(obs->prn(), obsVector);
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| 330 | }
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| 331 | }
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| 332 | }
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| 333 | }
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| 334 | }
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| 335 |
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[5747] | 336 | return success;
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[5743] | 337 | }
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| 338 |
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| 339 | // Reset Ambiguity Parameter (cycle slip)
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| 340 | ////////////////////////////////////////////////////////////////////////////
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[5819] | 341 | t_irc t_pppFilter::resetAmb(t_prn prn, const vector<t_pppSatObs*>& obsVector,
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[5916] | 342 | SymmetricMatrix* QSav, ColumnVector* xSav) {
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[5747] | 343 | t_irc irc = failure;
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[5810] | 344 | vector<t_pppParam*>& params = _parlist->params();
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[5743] | 345 | for (unsigned iPar = 0; iPar < params.size(); iPar++) {
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[5810] | 346 | t_pppParam* par = params[iPar];
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| 347 | if (par->type() == t_pppParam::amb && par->prn() == prn) {
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[5743] | 348 | int ind = par->indexNew();
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| 349 | t_lc::type tLC = par->tLC();
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| 350 | LOG << string(_epoTime) << " RESET " << par->toString() << endl;
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[5810] | 351 | delete par; par = new t_pppParam(t_pppParam::amb, prn, tLC, &obsVector);
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[5743] | 352 | par->setIndex(ind);
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| 353 | params[iPar] = par;
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| 354 | for (unsigned ii = 1; ii <= params.size(); ii++) {
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| 355 | _QFlt(ii, ind+1) = 0.0;
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| 356 | if (QSav) {
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| 357 | (*QSav)(ii, ind+1) = 0.0;
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| 358 | }
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| 359 | }
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| 360 | _QFlt(ind+1,ind+1) = par->sigma0() * par->sigma0();
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| 361 | if (QSav) {
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| 362 | (*QSav)(ind+1,ind+1) = _QFlt(ind+1,ind+1);
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| 363 | }
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| 364 | _xFlt[ind] = 0.0;
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| 365 | if (xSav) {
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| 366 | (*xSav)[ind] = _xFlt[ind];
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| 367 | }
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| 368 | _x0[ind] = par->x0();
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[5747] | 369 | irc = success;
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[5743] | 370 | }
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| 371 | }
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| 372 |
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| 373 | return irc;
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| 374 | }
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| 375 |
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| 376 | // Compute various DOP Values
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| 377 | ////////////////////////////////////////////////////////////////////////////
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[5916] | 378 | void t_pppFilter::cmpDOP(const vector<t_pppSatObs*>& obsVector) {
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[5743] | 379 |
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| 380 | _dop.reset();
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[5916] | 381 |
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[5743] | 382 | try {
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[5916] | 383 | const unsigned numPar = 4;
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| 384 | Matrix AA(obsVector.size(), numPar);
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| 385 | _numSat = 0;
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| 386 | for (unsigned ii = 0; ii < obsVector.size(); ii++) {
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| 387 | t_pppSatObs* obs = obsVector[ii];
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| 388 | if (obs->isValid() && !obs->outlier()) {
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| 389 | ++_numSat;
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| 390 | for (unsigned iPar = 0; iPar < numPar; iPar++) {
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| 391 | const t_pppParam* par = _parlist->params()[iPar];
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| 392 | AA[_numSat-1][iPar] = par->partial(_epoTime, obs, t_lc::c1);
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| 393 | }
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| 394 | }
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| 395 | }
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[5743] | 396 | if (_numSat < 4) {
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| 397 | return;
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| 398 | }
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[5916] | 399 | AA = AA.Rows(1, _numSat);
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| 400 | SymmetricMatrix NN; NN << AA.t() * AA;
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[5743] | 401 | SymmetricMatrix QQ = NN.i();
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| 402 |
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| 403 | _dop.P = sqrt(QQ(1,1) + QQ(2,2) + QQ(3,3));
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| 404 | _dop.T = sqrt(QQ(4,4));
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| 405 | _dop.G = sqrt(QQ(1,1) + QQ(2,2) + QQ(3,3) + QQ(4,4));
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| 406 | }
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| 407 | catch (...) {
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| 408 | }
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| 409 | }
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[6003] | 410 |
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| 411 | // Compute various DOP Values
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| 412 | ////////////////////////////////////////////////////////////////////////////
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[6008] | 413 | void t_pppFilter::predictCovCrdPart(const SymmetricMatrix& QFltOld) {
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[6003] | 414 |
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| 415 | const vector<t_pppParam*>& params = _parlist->params();
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[6008] | 416 | if (params.size() < 3) {
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| 417 | return;
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| 418 | }
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[6003] | 419 |
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[6008] | 420 | bool first = (params[0]->indexOld() < 0);
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[6007] | 421 |
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[6009] | 422 | SymmetricMatrix Qneu(3); Qneu = 0.0;
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| 423 | for (unsigned ii = 0; ii < 3; ii++) {
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| 424 | const t_pppParam* par = params[ii];
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| 425 | if (first) {
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| 426 | Qneu[ii][ii] = par->sigma0() * par->sigma0();
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[6003] | 427 | }
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[6009] | 428 | else {
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| 429 | Qneu[ii][ii] = par->noise() * par->noise();
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| 430 | }
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[6008] | 431 | }
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[6009] | 432 |
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| 433 | const t_pppStation* sta = PPP_CLIENT->staRover();
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| 434 | SymmetricMatrix Qxyz(3);
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| 435 | covariNEU_XYZ(Qneu, sta->ellApr().data(), Qxyz);
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| 436 |
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| 437 | if (first) {
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| 438 | _QFlt.SymSubMatrix(1,3) = Qxyz;
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| 439 | }
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[6008] | 440 | else {
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[6012] | 441 | double dt = _epoTime - _firstEpoTime;
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| 442 | if (dt < OPT->_seedingTime) {
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| 443 | _QFlt.SymSubMatrix(1,3) = QFltOld.SymSubMatrix(1,3);
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| 444 | }
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| 445 | else {
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| 446 | _QFlt.SymSubMatrix(1,3) = QFltOld.SymSubMatrix(1,3) + Qxyz;
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| 447 | }
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[6003] | 448 | }
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| 449 | }
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