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: bncParam, bncModel
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30 | *
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31 | * Purpose: Model for PPP
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32 | *
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33 | * Author: L. Mervart
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34 | *
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35 | * Created: 01-Dec-2009
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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 <iomanip>
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42 | #include <cmath>
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43 | #include <newmatio.h>
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44 | #include <sstream>
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45 |
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46 | #include "bncmodel.h"
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47 | #include "bncapp.h"
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48 | #include "bncpppclient.h"
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49 | #include "bancroft.h"
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50 | #include "bncutils.h"
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51 | #include "bncsettings.h"
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52 |
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53 | using namespace std;
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54 |
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55 | const unsigned MINOBS = 4;
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56 | const double MINELE = 10.0 * M_PI / 180.0;
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57 | const double MAXRES_CODE = 10.0;
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58 | const double MAXRES_PHASE = 0.10;
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59 | const double sig_crd_0 = 100.0;
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60 | const double sig_crd_p = 100.0;
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61 | const double sig_clk_0 = 1000.0;
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62 | const double sig_trp_0 = 0.01;
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63 | const double sig_trp_p = 1e-6;
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64 | const double sig_amb_0 = 100.0;
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65 | const double sig_P3 = 1.0;
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66 | const double sig_L3 = 0.01;
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67 |
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68 | // Constructor
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69 | ////////////////////////////////////////////////////////////////////////////
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70 | bncParam::bncParam(bncParam::parType typeIn, int indexIn,
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71 | const QString& prnIn) {
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72 | type = typeIn;
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73 | index = indexIn;
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74 | prn = prnIn;
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75 | index_old = 0;
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76 | xx = 0.0;
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77 | }
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78 |
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79 | // Destructor
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80 | ////////////////////////////////////////////////////////////////////////////
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81 | bncParam::~bncParam() {
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82 | }
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83 |
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84 | // Partial
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85 | ////////////////////////////////////////////////////////////////////////////
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86 | double bncParam::partial(t_satData* satData, const QString& prnIn) {
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87 | if (type == CRD_X) {
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88 | return (xx - satData->xx(1)) / satData->rho;
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89 | }
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90 | else if (type == CRD_Y) {
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91 | return (xx - satData->xx(2)) / satData->rho;
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92 | }
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93 | else if (type == CRD_Z) {
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94 | return (xx - satData->xx(3)) / satData->rho;
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95 | }
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96 | else if (type == RECCLK) {
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97 | return 1.0;
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98 | }
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99 | else if (type == TROPO) {
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100 | return 1.0 / sin(satData->eleSat);
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101 | }
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102 | else if (type == AMB_L3) {
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103 | if (prnIn == prn) {
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104 | return 1.0;
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105 | }
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106 | else {
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107 | return 0.0;
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108 | }
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109 | }
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110 | return 0.0;
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111 | }
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112 |
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113 | // Constructor
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114 | ////////////////////////////////////////////////////////////////////////////
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115 | bncModel::bncModel(QByteArray staID) {
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116 |
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117 | _staID = staID;
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118 |
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119 | connect(this, SIGNAL(newMessage(QByteArray,bool)),
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120 | ((bncApp*)qApp), SLOT(slotMessage(const QByteArray,bool)));
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121 |
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122 | bncSettings settings;
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123 |
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124 | _static = false;
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125 | if ( Qt::CheckState(settings.value("pppStatic").toInt()) == Qt::Checked) {
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126 | _static = true;
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127 | }
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128 |
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129 | _usePhase = false;
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130 | if ( Qt::CheckState(settings.value("pppUsePhase").toInt()) == Qt::Checked) {
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131 | _usePhase = true;
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132 | }
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133 |
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134 | _estTropo = false;
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135 | if ( Qt::CheckState(settings.value("pppEstTropo").toInt()) == Qt::Checked) {
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136 | _estTropo = true;
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137 | }
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138 |
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139 | _xcBanc.ReSize(4); _xcBanc = 0.0;
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140 | _ellBanc.ReSize(3); _ellBanc = 0.0;
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141 |
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142 | _params.push_back(new bncParam(bncParam::CRD_X, 1, ""));
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143 | _params.push_back(new bncParam(bncParam::CRD_Y, 2, ""));
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144 | _params.push_back(new bncParam(bncParam::CRD_Z, 3, ""));
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145 | _params.push_back(new bncParam(bncParam::RECCLK, 4, ""));
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146 | if (_estTropo) {
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147 | _params.push_back(new bncParam(bncParam::TROPO, 5, ""));
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148 | }
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149 |
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150 | unsigned nPar = _params.size();
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151 |
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152 | _QQ.ReSize(nPar);
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153 | _QQ = 0.0;
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154 |
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155 | _QQ(1,1) = sig_crd_0 * sig_crd_0;
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156 | _QQ(2,2) = sig_crd_0 * sig_crd_0;
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157 | _QQ(3,3) = sig_crd_0 * sig_crd_0;
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158 | _QQ(4,4) = sig_clk_0 * sig_clk_0;
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159 | if (_estTropo) {
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160 | _QQ(5,5) = sig_trp_0 * sig_trp_0;
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161 | }
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162 | }
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163 |
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164 | // Destructor
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165 | ////////////////////////////////////////////////////////////////////////////
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166 | bncModel::~bncModel() {
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167 | }
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168 |
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169 | // Bancroft Solution
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170 | ////////////////////////////////////////////////////////////////////////////
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171 | t_irc bncModel::cmpBancroft(t_epoData* epoData) {
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172 |
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173 | if (epoData->size() < MINOBS) {
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174 | return failure;
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175 | }
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176 |
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177 | Matrix BB(epoData->size(), 4);
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178 |
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179 | QMapIterator<QString, t_satData*> it(epoData->satData);
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180 | int iObs = 0;
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181 | while (it.hasNext()) {
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182 | ++iObs;
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183 | it.next();
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184 | QString prn = it.key();
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185 | t_satData* satData = it.value();
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186 | BB(iObs, 1) = satData->xx(1);
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187 | BB(iObs, 2) = satData->xx(2);
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188 | BB(iObs, 3) = satData->xx(3);
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189 | BB(iObs, 4) = satData->P3 + satData->clk;
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190 | }
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191 |
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192 | bancroft(BB, _xcBanc);
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193 |
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194 | // Ellipsoidal Coordinates
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195 | // ------------------------
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196 | xyz2ell(_xcBanc.data(), _ellBanc.data());
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197 |
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198 | // Compute Satellite Elevations
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199 | // ----------------------------
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200 | QMutableMapIterator<QString, t_satData*> it2(epoData->satData);
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201 | while (it2.hasNext()) {
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202 | it2.next();
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203 | QString prn = it2.key();
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204 | t_satData* satData = it2.value();
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205 |
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206 | ColumnVector rr = satData->xx - _xcBanc.Rows(1,3);
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207 | double rho = rr.norm_Frobenius();
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208 |
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209 | double neu[3];
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210 | xyz2neu(_ellBanc.data(), rr.data(), neu);
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211 |
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212 | satData->eleSat = acos( sqrt(neu[0]*neu[0] + neu[1]*neu[1]) / rho );
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213 | if (neu[2] < 0) {
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214 | satData->eleSat *= -1.0;
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215 | }
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216 | satData->azSat = atan2(neu[1], neu[0]);
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217 |
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218 | if (satData->eleSat < MINELE) {
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219 | delete satData;
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220 | it2.remove();
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221 | }
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222 | }
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223 |
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224 | return success;
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225 | }
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226 |
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227 | // Computed Value
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228 | ////////////////////////////////////////////////////////////////////////////
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229 | double bncModel::cmpValue(t_satData* satData) {
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230 |
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231 | ColumnVector xRec(3);
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232 | xRec(1) = x();
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233 | xRec(2) = y();
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234 | xRec(3) = z();
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235 |
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236 | double rho0 = (satData->xx - xRec).norm_Frobenius();
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237 | double dPhi = t_CST::omega * rho0 / t_CST::c;
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238 |
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239 | xRec(1) = x() * cos(dPhi) - y() * sin(dPhi);
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240 | xRec(2) = y() * cos(dPhi) + x() * sin(dPhi);
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241 | xRec(3) = z();
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242 |
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243 | satData->rho = (satData->xx - xRec).norm_Frobenius();
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244 |
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245 | double tropDelay = delay_saast(satData->eleSat) +
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246 | trp() / sin(satData->eleSat);
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247 |
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248 | return satData->rho + clk() - satData->clk + tropDelay;
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249 | }
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250 |
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251 | // Tropospheric Model (Saastamoinen)
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252 | ////////////////////////////////////////////////////////////////////////////
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253 | double bncModel::delay_saast(double Ele) {
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254 |
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255 | double height = _ellBanc(3);
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256 |
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257 | double pp = 1013.25 * pow(1.0 - 2.26e-5 * height, 5.225);
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258 | double TT = 18.0 - height * 0.0065 + 273.15;
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259 | double hh = 50.0 * exp(-6.396e-4 * height);
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260 | double ee = hh / 100.0 * exp(-37.2465 + 0.213166*TT - 0.000256908*TT*TT);
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261 |
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262 | double h_km = height / 1000.0;
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263 |
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264 | if (h_km < 0.0) h_km = 0.0;
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265 | if (h_km > 5.0) h_km = 5.0;
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266 | int ii = int(h_km + 1);
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267 | double href = ii - 1;
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268 |
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269 | double bCor[6];
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270 | bCor[0] = 1.156;
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271 | bCor[1] = 1.006;
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272 | bCor[2] = 0.874;
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273 | bCor[3] = 0.757;
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274 | bCor[4] = 0.654;
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275 | bCor[5] = 0.563;
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276 |
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277 | double BB = bCor[ii-1] + (bCor[ii]-bCor[ii-1]) * (h_km - href);
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278 |
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279 | double zen = M_PI/2.0 - Ele;
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280 |
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281 | return (0.002277/cos(zen)) * (pp + ((1255.0/TT)+0.05)*ee - BB*(tan(zen)*tan(zen)));
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282 | }
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283 |
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284 | // Prediction Step of the Filter
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285 | ////////////////////////////////////////////////////////////////////////////
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286 | void bncModel::predict(t_epoData* epoData) {
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287 |
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288 | if (_usePhase) {
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289 |
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290 | // Make a copy of QQ and xx, set parameter indices
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291 | // -----------------------------------------------
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292 | SymmetricMatrix QQ_old = _QQ;
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293 |
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294 | for (int iPar = 1; iPar <= _params.size(); iPar++) {
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295 | _params[iPar-1]->index_old = _params[iPar-1]->index;
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296 | _params[iPar-1]->index = 0;
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297 | }
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298 |
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299 | // Remove Ambiguity Parameters without observations
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300 | // ------------------------------------------------
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301 | int iPar = 0;
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302 | QMutableVectorIterator<bncParam*> it(_params);
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303 | while (it.hasNext()) {
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304 | bncParam* par = it.next();
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305 | bool removed = false;
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306 | if (par->type == bncParam::AMB_L3) {
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307 | if (epoData->satData.find(par->prn) == epoData->satData.end()) {
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308 | removed = true;
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309 | delete par;
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310 | it.remove();
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311 | }
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312 | }
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313 | if (! removed) {
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314 | ++iPar;
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315 | par->index = iPar;
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316 | }
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317 | }
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318 |
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319 | // Add new ambiguity parameters
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320 | // ----------------------------
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321 | QMapIterator<QString, t_satData*> itObs(epoData->satData);
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322 | while (itObs.hasNext()) {
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323 | itObs.next();
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324 | QString prn = itObs.key();
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325 | bool found = false;
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326 | for (int iPar = 1; iPar <= _params.size(); iPar++) {
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327 | if (_params[iPar-1]->type == bncParam::AMB_L3 &&
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328 | _params[iPar-1]->prn == prn) {
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329 | found = true;
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330 | break;
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331 | }
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332 | }
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333 | if (!found) {
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334 | bncParam* par = new bncParam(bncParam::AMB_L3, _params.size()+1, prn);
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335 | _params.push_back(par);
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336 | }
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337 | }
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338 |
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339 | int nPar = _params.size();
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340 | _QQ.ReSize(nPar); _QQ = 0.0;
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341 | for (int i1 = 1; i1 <= nPar; i1++) {
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342 | bncParam* p1 = _params[i1-1];
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343 | if (p1->index_old != 0) {
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344 | _QQ(p1->index, p1->index) = QQ_old(p1->index_old, p1->index_old);
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345 | for (int i2 = 1; i2 <= nPar; i2++) {
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346 | bncParam* p2 = _params[i2-1];
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347 | if (p2->index_old != 0) {
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348 | _QQ(p1->index, p2->index) = QQ_old(p1->index_old, p2->index_old);
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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 | for (int ii = 1; ii <= nPar; ii++) {
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355 | bncParam* par = _params[ii-1];
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356 | if (par->index_old == 0) {
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357 | _QQ(par->index, par->index) = sig_amb_0 * sig_amb_0;
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358 | }
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359 | par->index_old = par->index;
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360 | }
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361 | }
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362 |
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363 | // Coordinates
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364 | // -----------
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365 | if (_static) {
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366 | if (x() == 0.0 && y() == 0.0 && z() == 0.0) {
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367 | _params[0]->xx = _xcBanc(1);
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368 | _params[1]->xx = _xcBanc(2);
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369 | _params[2]->xx = _xcBanc(3);
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370 | }
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371 | }
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372 | else {
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373 | _params[0]->xx = _xcBanc(1);
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374 | _params[1]->xx = _xcBanc(2);
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375 | _params[2]->xx = _xcBanc(3);
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376 |
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377 | _QQ(1,1) += sig_crd_p * sig_crd_p;
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378 | _QQ(2,2) += sig_crd_p * sig_crd_p;
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379 | _QQ(3,3) += sig_crd_p * sig_crd_p;
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380 | }
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381 |
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382 | // Receiver Clocks
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383 | // ---------------
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384 | _params[3]->xx = _xcBanc(4);
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385 | for (int iPar = 1; iPar <= _params.size(); iPar++) {
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386 | _QQ(iPar, 4) = 0.0;
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387 | }
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388 | _QQ(4,4) = sig_clk_0 * sig_clk_0;
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389 |
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390 | // Tropospheric Delay
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391 | // ------------------
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392 | if (_estTropo) {
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393 | _QQ(5,5) += sig_trp_p * sig_trp_p;
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394 | }
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395 | }
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396 |
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397 | // Update Step of the Filter (currently just a single-epoch solution)
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398 | ////////////////////////////////////////////////////////////////////////////
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399 | t_irc bncModel::update(t_epoData* epoData) {
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400 |
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401 | SymmetricMatrix QQsav;
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402 | ColumnVector dx;
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403 | ColumnVector vv;
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404 |
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405 | // Loop over all outliers
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406 | // ----------------------
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407 | do {
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408 |
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409 | // Bancroft Solution
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410 | // -----------------
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411 | if (cmpBancroft(epoData) != success) {
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412 | return failure;
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413 | }
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414 |
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415 | if (epoData->size() < MINOBS) {
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416 | return failure;
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417 | }
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418 |
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419 | // Status Prediction
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420 | // -----------------
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421 | predict(epoData);
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422 |
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423 | // Create First-Design Matrix
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424 | // --------------------------
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425 | unsigned nPar = _params.size();
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426 | unsigned nObs = _usePhase ? 2 * epoData->size() : epoData->size();
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427 |
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428 | Matrix AA(nObs, nPar); // first design matrix
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429 | ColumnVector ll(nObs); // tems observed-computed
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430 | SymmetricMatrix PP(nObs); PP = 0.0;
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431 |
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432 | unsigned iObs = 0;
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433 | QMapIterator<QString, t_satData*> itObs(epoData->satData);
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434 | while (itObs.hasNext()) {
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435 | ++iObs;
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436 | itObs.next();
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437 | QString prn = itObs.key();
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438 | t_satData* satData = itObs.value();
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439 |
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440 | double rhoCmp = cmpValue(satData);
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441 |
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442 | double ellWgtCoeff = 1.0;
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443 | //// double eleD = satData->eleSat * 180.0 / M_PI;
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444 | //// if (eleD < 25.0) {
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445 | //// ellWgtCoeff = 2.5 - (eleD - 10.0) * 0.1;
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446 | //// ellWgtCoeff *= ellWgtCoeff;
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447 | //// }
|
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448 |
|
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449 | ll(iObs) = satData->P3 - rhoCmp;
|
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450 | PP(iObs,iObs) = 1.0 / (sig_P3 * sig_P3) / ellWgtCoeff;
|
---|
451 | for (int iPar = 1; iPar <= _params.size(); iPar++) {
|
---|
452 | AA(iObs, iPar) = _params[iPar-1]->partial(satData, "");
|
---|
453 | }
|
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454 |
|
---|
455 | if (_usePhase) {
|
---|
456 | ++iObs;
|
---|
457 | ll(iObs) = satData->L3 - rhoCmp;
|
---|
458 | PP(iObs,iObs) = 1.0 / (sig_L3 * sig_L3) / ellWgtCoeff;
|
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459 | for (int iPar = 1; iPar <= _params.size(); iPar++) {
|
---|
460 | if (_params[iPar-1]->type == bncParam::AMB_L3 &&
|
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461 | _params[iPar-1]->prn == prn) {
|
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462 | ll(iObs) -= _params[iPar-1]->xx;
|
---|
463 | }
|
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464 | AA(iObs, iPar) = _params[iPar-1]->partial(satData, prn);
|
---|
465 | }
|
---|
466 | }
|
---|
467 | }
|
---|
468 |
|
---|
469 | // Compute Filter Update
|
---|
470 | // ---------------------
|
---|
471 | QQsav = _QQ;
|
---|
472 |
|
---|
473 | Matrix ATP = AA.t() * PP;
|
---|
474 | SymmetricMatrix NN = _QQ.i();
|
---|
475 | NN << NN + ATP * AA;
|
---|
476 | _QQ = NN.i();
|
---|
477 | dx = _QQ * ATP * ll;
|
---|
478 | vv = ll - AA * dx;
|
---|
479 |
|
---|
480 | } while (outlierDetection(QQsav, vv, epoData->satData) != 0);
|
---|
481 |
|
---|
482 | // Set Solution Vector
|
---|
483 | // -------------------
|
---|
484 | QVectorIterator<bncParam*> itPar(_params);
|
---|
485 | while (itPar.hasNext()) {
|
---|
486 | bncParam* par = itPar.next();
|
---|
487 | par->xx += dx(par->index);
|
---|
488 | }
|
---|
489 |
|
---|
490 | // Message (both log file and screen)
|
---|
491 | // ----------------------------------
|
---|
492 | ostringstream str;
|
---|
493 | str.setf(ios::fixed);
|
---|
494 | str << " PPP " << _staID.data() << " "
|
---|
495 | << epoData->tt.timestr(1) << " " << epoData->size() << " "
|
---|
496 | << setw(14) << setprecision(3) << x() << " +- "
|
---|
497 | << setw(6) << setprecision(3) << sqrt(_QQ(1,1)) << " "
|
---|
498 | << setw(14) << setprecision(3) << y() << " +- "
|
---|
499 | << setw(6) << setprecision(3) << sqrt(_QQ(2,2)) << " "
|
---|
500 | << setw(14) << setprecision(3) << z() << " +- "
|
---|
501 | << setw(6) << setprecision(3) << sqrt(_QQ(3,3));
|
---|
502 | if (_estTropo) {
|
---|
503 | str << " " << setw(6) << setprecision(3) << trp() << " +- "
|
---|
504 | << setw(6) << setprecision(3) << sqrt(_QQ(5,5));
|
---|
505 | }
|
---|
506 |
|
---|
507 | emit newMessage(QString(str.str().c_str()).toAscii(), true);
|
---|
508 |
|
---|
509 | return success;
|
---|
510 | }
|
---|
511 |
|
---|
512 | // Outlier Detection
|
---|
513 | ////////////////////////////////////////////////////////////////////////////
|
---|
514 | int bncModel::outlierDetection(const SymmetricMatrix& QQsav,
|
---|
515 | const ColumnVector& vv,
|
---|
516 | QMap<QString, t_satData*>& satData) {
|
---|
517 |
|
---|
518 | double vvMaxCode = 0.0;
|
---|
519 | double vvMaxPhase = 0.0;
|
---|
520 | QMutableMapIterator<QString, t_satData*> itMaxCode(satData);
|
---|
521 | QMutableMapIterator<QString, t_satData*> itMaxPhase(satData);
|
---|
522 |
|
---|
523 | int ii = 0;
|
---|
524 | QMutableMapIterator<QString, t_satData*> it(satData);
|
---|
525 | while (it.hasNext()) {
|
---|
526 | it.next();
|
---|
527 | ++ii;
|
---|
528 |
|
---|
529 | if (vvMaxCode == 0.0 || fabs(vv(ii)) > vvMaxCode) {
|
---|
530 | vvMaxCode = fabs(vv(ii));
|
---|
531 | itMaxCode = it;
|
---|
532 | }
|
---|
533 |
|
---|
534 | if (_usePhase) {
|
---|
535 | ++ii;
|
---|
536 | if (vvMaxPhase == 0.0 || fabs(vv(ii)) > vvMaxPhase) {
|
---|
537 | vvMaxPhase = fabs(vv(ii));
|
---|
538 | itMaxPhase = it;
|
---|
539 | }
|
---|
540 | }
|
---|
541 | }
|
---|
542 |
|
---|
543 | if (vvMaxCode > MAXRES_CODE) {
|
---|
544 | QString prn = itMaxCode.key();
|
---|
545 | t_satData* satData = itMaxCode.value();
|
---|
546 | delete satData;
|
---|
547 | itMaxCode.remove();
|
---|
548 | _QQ = QQsav;
|
---|
549 |
|
---|
550 | QByteArray msg = "Outlier Code " + prn.toAscii() + " "
|
---|
551 | + QByteArray::number(vvMaxCode, 'f', 3);
|
---|
552 | emit newMessage(msg, true);
|
---|
553 |
|
---|
554 | return 1;
|
---|
555 | }
|
---|
556 | else if (vvMaxPhase > MAXRES_PHASE) {
|
---|
557 | QString prn = itMaxPhase.key();
|
---|
558 | t_satData* satData = itMaxPhase.value();
|
---|
559 | delete satData;
|
---|
560 | itMaxPhase.remove();
|
---|
561 | _QQ = QQsav;
|
---|
562 |
|
---|
563 | QByteArray msg = "Outlier Phase " + prn.toAscii() + " "
|
---|
564 | + QByteArray::number(vvMaxPhase, 'f', 3);
|
---|
565 | emit newMessage(msg, true);
|
---|
566 |
|
---|
567 | return 1;
|
---|
568 | }
|
---|
569 |
|
---|
570 | return 0;
|
---|
571 | }
|
---|