1 | // Part of BNC, a utility for retrieving decoding and
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2 | // converting GNSS data streams from NTRIP broadcasters.
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3 | //
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4 | // Copyright (C) 2007
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5 | // German Federal Agency for Cartography and Geodesy (BKG)
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6 | // http://www.bkg.bund.de
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7 | // Czech Technical University Prague, Department of Geodesy
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8 | // http://www.fsv.cvut.cz
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9 | //
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10 | // Email: euref-ip@bkg.bund.de
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11 | //
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12 | // This program is free software; you can redistribute it and/or
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13 | // modify it under the terms of the GNU General Public License
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14 | // as published by the Free Software Foundation, version 2.
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15 | //
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16 | // This program is distributed in the hope that it will be useful,
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17 | // but WITHOUT ANY WARRANTY; without even the implied warranty of
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18 | // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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19 | // GNU General Public License for more details.
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20 | //
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21 | // You should have received a copy of the GNU General Public License
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22 | // along with this program; if not, write to the Free Software
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23 | // Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
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24 |
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25 | /* -------------------------------------------------------------------------
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26 | * BKG NTRIP Client
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27 | * -------------------------------------------------------------------------
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28 | *
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29 | * Class: t_pppFilter
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30 | *
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31 | * Purpose: Filter Adjustment
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32 | *
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33 | * Author: L. Mervart
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34 | *
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35 | * Created: 29-Jul-2014
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36 | *
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37 | * Changes:
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38 | *
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39 | * -----------------------------------------------------------------------*/
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40 |
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41 | #include <iostream>
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42 | #include <iomanip>
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43 | #include <cmath>
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44 | #include <newmat.h>
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45 | #include <newmatio.h>
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46 | #include <newmatap.h>
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47 |
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48 | #include "pppFilter.h"
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49 | #include "bncutils.h"
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50 | #include "pppParlist.h"
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51 | #include "pppObsPool.h"
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52 | #include "pppStation.h"
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53 | #include "pppClient.h"
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54 |
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55 | using namespace BNC_PPP;
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56 | using namespace std;
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57 |
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58 | // Constructor
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59 | ////////////////////////////////////////////////////////////////////////////
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60 | t_pppFilter::t_pppFilter() {
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61 | _parlist = 0;
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62 | }
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63 |
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64 | // Destructor
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65 | ////////////////////////////////////////////////////////////////////////////
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66 | t_pppFilter::~t_pppFilter() {
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67 | delete _parlist;
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68 | }
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69 |
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70 | // Process Single Epoch
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71 | ////////////////////////////////////////////////////////////////////////////
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72 | t_irc t_pppFilter::processEpoch(t_pppObsPool* obsPool) {
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73 |
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74 | _numSat = 0;
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75 |
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76 | if (!_parlist) {
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77 | _parlist = new t_pppParlist();
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78 | }
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79 |
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80 | // Vector of all Observations
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81 | // --------------------------
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82 | t_pppObsPool::t_epoch* epoch = obsPool->lastEpoch();
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83 | if (!epoch) {
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84 | return failure;
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85 | }
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86 | vector<t_pppSatObs*>& allObs = epoch->obsVector();
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87 |
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88 | // Time of the Epoch
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89 | // -----------------
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90 | _epoTime = epoch->epoTime();
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91 |
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92 | // Set Parameters
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93 | // --------------
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94 | _parlist->set(_epoTime, allObs);
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95 | const vector<t_pppParam*>& params = _parlist->params();
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96 |
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97 | // Status Vector, Variance-Covariance Matrix
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98 | // -----------------------------------------
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99 | ColumnVector xFltOld = _xFlt;
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100 | SymmetricMatrix QFltOld = _QFlt;
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101 |
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102 | _QFlt.ReSize(_parlist->nPar()); _QFlt = 0.0;
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103 | _xFlt.ReSize(_parlist->nPar()); _xFlt = 0.0;
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104 | _x0.ReSize(_parlist->nPar()); _x0 = 0.0;
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105 |
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106 | for (unsigned ii = 0; ii < params.size(); ii++) {
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107 | const t_pppParam* par1 = params[ii];
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108 |
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109 | _x0[ii] = par1->x0();
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110 |
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111 | int iOld = par1->indexOld();
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112 | if (iOld < 0) {
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113 | _QFlt[ii][ii] = par1->sigma0() * par1->sigma0(); // new parameter
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114 | }
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115 | else {
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116 | _QFlt[ii][ii] = QFltOld[iOld][iOld] + par1->noise() * par1->noise();
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117 | _xFlt[ii] = xFltOld[iOld];
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118 | for (unsigned jj = 0; jj < ii; jj++) {
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119 | const t_pppParam* par2 = params[jj];
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120 | int jOld = par2->indexOld();
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121 | if (jOld >= 0) {
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122 | _QFlt[ii][jj] = QFltOld(iOld+1,jOld+1);
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123 | }
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124 | }
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125 | }
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126 | }
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127 |
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128 | // Process Satellite Systems separately
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129 | // ------------------------------------
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130 | for (unsigned iSys = 0; iSys < OPT->systems().size(); iSys++) {
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131 | char system = OPT->systems()[iSys];
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132 | vector<t_pppSatObs*> obsVector;
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133 | for (unsigned jj = 0; jj < allObs.size(); jj++) {
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134 | if (allObs[jj]->prn().system() == system) {
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135 | obsVector.push_back(allObs[jj]);
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136 | }
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137 | }
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138 | if ( processSystem(OPT->LCs(system), obsVector) != success ) {
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139 | return failure;
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140 | }
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141 | }
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142 |
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143 | cmpDOP(allObs);
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144 |
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145 | _parlist->printResult(_epoTime, _QFlt, _xFlt);
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146 |
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147 | return success;
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148 | }
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149 |
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150 | // Process Selected LCs
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151 | ////////////////////////////////////////////////////////////////////////////
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152 | t_irc t_pppFilter::processSystem(const vector<t_lc::type>& LCs,
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153 | const vector<t_pppSatObs*>& obsVector) {
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154 |
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155 | LOG.setf(ios::fixed);
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156 |
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157 | // Detect Cycle Slips
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158 | // ------------------
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159 | if (detectCycleSlips(LCs, obsVector) != success) {
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160 | return failure;
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161 | }
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162 |
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163 | ColumnVector xSav = _xFlt;
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164 | SymmetricMatrix QSav = _QFlt;
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165 | string epoTimeStr = string(_epoTime);
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166 | const vector<t_pppParam*>& params = _parlist->params();
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167 | unsigned maxObs = obsVector.size() * LCs.size();
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168 |
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169 | // Outlier Detection Loop
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170 | // ----------------------
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171 | for (unsigned iOutlier = 0; iOutlier < maxObs; iOutlier++) {
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172 |
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173 | if (iOutlier > 0) {
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174 | _xFlt = xSav;
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175 | _QFlt = QSav;
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176 | }
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177 |
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178 | // First-Design Matrix, Terms Observed-Computed, Weight Matrix
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179 | // -----------------------------------------------------------
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180 | Matrix AA(maxObs, _parlist->nPar());
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181 | ColumnVector ll(maxObs);
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182 | DiagonalMatrix PP(maxObs); PP = 0.0;
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183 |
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184 | int iObs = -1;
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185 | vector<t_pppSatObs*> usedObs;
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186 | vector<t_lc::type> usedTypes;
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187 | for (unsigned ii = 0; ii < obsVector.size(); ii++) {
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188 | t_pppSatObs* obs = obsVector[ii];
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189 | if (!obs->outlier()) {
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190 | for (unsigned jj = 0; jj < LCs.size(); jj++) {
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191 | const t_lc::type tLC = LCs[jj];
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192 | ++iObs;
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193 | usedObs.push_back(obs);
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194 | usedTypes.push_back(tLC);
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195 | for (unsigned iPar = 0; iPar < params.size(); iPar++) {
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196 | const t_pppParam* par = params[iPar];
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197 | AA[iObs][iPar] = par->partial(_epoTime, obs, tLC);
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198 | }
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199 | ll[iObs] = obs->obsValue(tLC) - obs->cmpValue(tLC) - DotProduct(_x0, AA.Row(iObs+1));
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200 | PP[iObs] = 1.0 / (obs->sigma(tLC) * obs->sigma(tLC));
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201 | }
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202 | }
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203 | }
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204 |
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205 | // Check number of observations, truncate matrices
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206 | // -----------------------------------------------
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207 | if (iObs+1 < OPT->_minObs) {
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208 | return failure;
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209 | }
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210 | AA = AA.Rows(1, iObs+1);
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211 | ll = ll.Rows(1, iObs+1);
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212 | PP = PP.SymSubMatrix(1, iObs+1);
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213 |
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214 | // Kalman update step
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215 | // ------------------
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216 | kalman(AA, ll, PP, _QFlt, _xFlt);
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217 |
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218 | // Check Residuals
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219 | // ---------------
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220 | ColumnVector vv = AA * _xFlt - ll;
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221 | double maxOutlier = 0.0;
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222 | int maxOutlierIndex = -1;
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223 | t_lc::type maxOutlierLC = t_lc::dummy;
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224 | for (unsigned ii = 0; ii < usedObs.size(); ii++) {
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225 | const t_lc::type tLC = usedTypes[ii];
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226 | double res = fabs(vv[ii]);
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227 | if (res > usedObs[ii]->maxRes(tLC)) {
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228 | if (res > fabs(maxOutlier)) {
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229 | maxOutlier = vv[ii];
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230 | maxOutlierIndex = ii;
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231 | maxOutlierLC = tLC;
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232 | }
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233 | }
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234 | }
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235 |
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236 | // Mark outlier or break outlier detection loop
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237 | // --------------------------------------------
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238 | if (maxOutlierIndex > -1) {
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239 | t_pppSatObs* obs = usedObs[maxOutlierIndex];
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240 | t_pppParam* par = 0;
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241 | LOG << epoTimeStr << " Outlier " << t_lc::toString(maxOutlierLC) << ' '
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242 | << obs->prn().toString() << ' '
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243 | << setw(8) << setprecision(4) << maxOutlier << endl;
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244 | for (unsigned iPar = 0; iPar < params.size(); iPar++) {
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245 | t_pppParam* hlp = params[iPar];
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246 | if (hlp->type() == t_pppParam::amb && hlp->prn() == obs->prn() &&
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247 | hlp->tLC() == usedTypes[maxOutlierIndex]) {
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248 | par = hlp;
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249 | }
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250 | }
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251 | if (par) {
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252 | if (par->ambResetCandidate()) {
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253 | resetAmb(par->prn(), obsVector, &QSav, &xSav);
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254 | }
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255 | else {
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256 | par->setAmbResetCandidate();
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257 | obs->setOutlier();
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258 | }
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259 | }
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260 | else {
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261 | obs->setOutlier();
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262 | }
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263 | }
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264 |
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265 | // Print Residuals
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266 | // ---------------
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267 | else {
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268 | for (unsigned jj = 0; jj < LCs.size(); jj++) {
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269 | for (unsigned ii = 0; ii < usedObs.size(); ii++) {
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270 | const t_lc::type tLC = usedTypes[ii];
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271 | t_pppSatObs* obs = usedObs[ii];
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272 | if (tLC == LCs[jj]) {
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273 | obs->setRes(tLC, vv[ii]);
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274 | LOG << epoTimeStr << " RES "
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275 | << left << setw(3) << t_lc::toString(tLC) << right << ' '
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276 | << obs->prn().toString() << ' '
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277 | << setw(8) << setprecision(4) << vv[ii] << endl;
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278 | }
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279 | }
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280 | }
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281 | break;
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282 | }
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283 | }
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284 |
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285 | return success;
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286 | }
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287 |
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288 | // Cycle-Slip Detection
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289 | ////////////////////////////////////////////////////////////////////////////
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290 | t_irc t_pppFilter::detectCycleSlips(const vector<t_lc::type>& LCs,
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291 | const vector<t_pppSatObs*>& obsVector) {
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292 |
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293 | const double SLIP = 20.0; // slip threshold
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294 | string epoTimeStr = string(_epoTime);
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295 | const vector<t_pppParam*>& params = _parlist->params();
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296 |
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297 | for (unsigned ii = 0; ii < LCs.size(); ii++) {
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298 | const t_lc::type& tLC = LCs[ii];
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299 | if (t_lc::includesPhase(tLC)) {
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300 | for (unsigned iObs = 0; iObs < obsVector.size(); iObs++) {
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301 | const t_pppSatObs* obs = obsVector[iObs];
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302 |
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303 | // Check set Slips and Jump Counters
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304 | // ---------------------------------
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305 | bool slip = false;
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306 |
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307 | if (obs->slip()) {
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308 | LOG << "cycle slip set (obs)" << endl;;
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309 | slip = true;
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310 | }
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311 |
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312 | if (_slips[obs->prn()]._obsSlipCounter != -1 &&
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313 | _slips[obs->prn()]._obsSlipCounter != obs->slipCounter()) {
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314 | LOG << "cycle slip set (obsSlipCounter)" << endl;
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315 | slip = true;
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316 | }
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317 | _slips[obs->prn()]._obsSlipCounter = obs->slipCounter();
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318 |
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319 | if (_slips[obs->prn()]._biasJumpCounter != -1 &&
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320 | _slips[obs->prn()]._biasJumpCounter != obs->biasJumpCounter()) {
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321 | LOG << "cycle slip set (biasJumpCounter)" << endl;
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322 | slip = true;
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323 | }
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324 | _slips[obs->prn()]._biasJumpCounter = obs->biasJumpCounter();
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325 |
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326 | // Slip Set
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327 | // --------
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328 | if (slip) {
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329 | resetAmb(obs->prn(), obsVector);
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330 | }
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331 |
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332 | // Check Pre-Fit Residuals
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333 | // -----------------------
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334 | else {
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335 | ColumnVector AA(params.size());
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336 | for (unsigned iPar = 0; iPar < params.size(); iPar++) {
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337 | const t_pppParam* par = params[iPar];
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338 | AA[iPar] = par->partial(_epoTime, obs, tLC);
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339 | }
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340 |
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341 | double ll = obs->obsValue(tLC) - obs->cmpValue(tLC) - DotProduct(_x0, AA);
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342 | double vv = DotProduct(AA, _xFlt) - ll;
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343 |
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344 | if (fabs(vv) > SLIP) {
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345 | LOG << epoTimeStr << " cycle slip detected " << t_lc::toString(tLC) << ' '
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346 | << obs->prn().toString() << ' ' << setw(8) << setprecision(4) << vv << endl;
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347 | resetAmb(obs->prn(), obsVector);
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348 | }
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349 | }
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350 | }
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351 | }
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352 | }
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353 |
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354 | return success;
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355 | }
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356 |
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357 | // Reset Ambiguity Parameter (cycle slip)
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358 | ////////////////////////////////////////////////////////////////////////////
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359 | t_irc t_pppFilter::resetAmb(t_prn prn, const vector<t_pppSatObs*>& obsVector,
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360 | SymmetricMatrix* QSav, ColumnVector* xSav) {
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361 | t_irc irc = failure;
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362 | vector<t_pppParam*>& params = _parlist->params();
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363 | for (unsigned iPar = 0; iPar < params.size(); iPar++) {
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364 | t_pppParam* par = params[iPar];
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365 | if (par->type() == t_pppParam::amb && par->prn() == prn) {
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366 | int ind = par->indexNew();
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367 | t_lc::type tLC = par->tLC();
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368 | LOG << string(_epoTime) << " RESET " << par->toString() << endl;
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369 | delete par; par = new t_pppParam(t_pppParam::amb, prn, tLC, &obsVector);
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370 | par->setIndex(ind);
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371 | params[iPar] = par;
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372 | for (unsigned ii = 1; ii <= params.size(); ii++) {
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373 | _QFlt(ii, ind+1) = 0.0;
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374 | if (QSav) {
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375 | (*QSav)(ii, ind+1) = 0.0;
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376 | }
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377 | }
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378 | _QFlt(ind+1,ind+1) = par->sigma0() * par->sigma0();
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379 | if (QSav) {
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380 | (*QSav)(ind+1,ind+1) = _QFlt(ind+1,ind+1);
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381 | }
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382 | _xFlt[ind] = 0.0;
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383 | if (xSav) {
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384 | (*xSav)[ind] = _xFlt[ind];
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385 | }
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386 | _x0[ind] = par->x0();
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387 | irc = success;
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388 | }
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389 | }
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390 |
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391 | return irc;
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392 | }
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393 |
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394 | // Compute various DOP Values
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395 | ////////////////////////////////////////////////////////////////////////////
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396 | void t_pppFilter::cmpDOP(const vector<t_pppSatObs*>& obsVector) {
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397 |
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398 | _dop.reset();
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399 |
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400 | try {
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401 | const unsigned numPar = 4;
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402 | Matrix AA(obsVector.size(), numPar);
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403 | _numSat = 0;
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404 | for (unsigned ii = 0; ii < obsVector.size(); ii++) {
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405 | t_pppSatObs* obs = obsVector[ii];
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406 | if (obs->isValid() && !obs->outlier()) {
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407 | ++_numSat;
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408 | for (unsigned iPar = 0; iPar < numPar; iPar++) {
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409 | const t_pppParam* par = _parlist->params()[iPar];
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410 | AA[_numSat-1][iPar] = par->partial(_epoTime, obs, t_lc::c1);
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411 | }
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412 | }
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413 | }
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414 | if (_numSat < 4) {
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415 | return;
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416 | }
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417 | AA = AA.Rows(1, _numSat);
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418 | SymmetricMatrix NN; NN << AA.t() * AA;
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419 | SymmetricMatrix QQ = NN.i();
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420 |
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421 | _dop.P = sqrt(QQ(1,1) + QQ(2,2) + QQ(3,3));
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422 | _dop.T = sqrt(QQ(4,4));
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423 | _dop.G = sqrt(QQ(1,1) + QQ(2,2) + QQ(3,3) + QQ(4,4));
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424 | }
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425 | catch (...) {
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426 | }
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427 | }
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