209 lines
6.3 KiB
C++
209 lines
6.3 KiB
C++
#include "rtcm.hh"
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#include "bits.hh"
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#include <iostream>
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using namespace std;
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void RTCMMessage::parse(const std::string& str)
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{
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auto gbu=[&str](int offset, int bits) {
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return getbitu((const unsigned char*)str.c_str(), offset, bits);
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};
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auto gbum=[&str](int& offset, int bits) {
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unsigned int ret = getbitu((const unsigned char*)str.c_str(), offset, bits);
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offset += bits;
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return ret;
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};
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auto gbs=[&str](int offset, int bits) {
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return getbits((const unsigned char*)str.c_str(), offset, bits);
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};
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auto gbsm=[&str](int& offset, int bits) {
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int ret = getbits((const unsigned char*)str.c_str(), offset, bits);
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offset += bits;
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return ret;
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};
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type = gbu(0, 12);
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// cout<<"Message number: "<<type << " of size "<<str.size()<<"\n";
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if(type == 1057 || type == 1240) {
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d_ephs.clear();
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int stride;
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int iodlen;
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if(type == 1057) { // GPS
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stride = 135;
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iodlen=8;
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}
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else { // Galileo
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stride=137;
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iodlen=10;
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}
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int sats = gbu(62, 6);
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sow = gbu(12, 20); // this is DF385
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udi = gbu(32, 4);
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mmi = gbu(36, 1);
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reference = gbu(37,1);
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ssrIOD = gbu(38,4);
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ssrProvider = gbu(42, 16);
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ssrSolution = gbu(58, 4);
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// cout <<" sow "<< sow <<" sats "<<sats<<" update interval " << udi <<" mmi " << mmi;
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// cout <<" reference "<< reference << " iod-ssr "<< ssrIOD << " ssr-provider " << ssrProvider << " ssr-solution ";
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// cout<< ssrSolution <<":\n";
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for(int n = 0; n < sats; ++n) {
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EphemerisDelta ed;
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int off = 68+stride*n;
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ed.radial = gbs(off+ iodlen + 6, 22) * 0.1; // we store this in millimeters
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ed.along = gbs(off+ iodlen+ 28, 20) * 0.4;
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ed.cross = gbs(off+ iodlen+48, 20) * 0.4;
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ed.dradial = gbs(off + iodlen+ 68, 21) * 0.001; // we store this in mm/s
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ed.dalong = gbs(off + iodlen + 89, 19) * 0.004;
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ed.dcross = gbs(off + iodlen +108, 19) * 0.004;
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ed.iod = gbu(off +6, iodlen);
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ed.sow = sow;
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ed.udi = udi;
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if(type == 1057) {
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ed.id.gnss = 0;
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ed.id.sigid = 0;
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}
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else if(type == 1240) {
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ed.id.gnss = 2;
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ed.id.sigid = 1;
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}
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ed.id.sv = gbu(off + 0, 6);
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// cout<<" "<<makeSatIDName(ed.id)<<" iode "<< ed.iod<<" ("<< ed.radial<<", "<<ed.along<<", "<<ed.cross<<") mm -> (";
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// cout<< ed.dradial<<", "<<ed.dalong<<", "<<ed.dcross<< ") mm/s\n";
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d_ephs.push_back(ed);
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}
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}
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else if(type == 1058 || type == 1241) {
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d_clocks.clear();
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int sats = gbu(61, 6);
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sow = gbu(12, 20);
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udi = gbu(32, 4);
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mmi = gbu(36, 1);
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ssrIOD = gbu(37, 4);
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ssrProvider = gbu(41, 16);
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ssrSolution=gbu(57, 4);
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// cout <<" sow "<< sow <<" sats "<<sats<<" update interval " << udi <<" mmi " << mmi;
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// cout << " iod-ssr "<< ssrIOD << " ssr-provider " << ssrProvider << " ssr-solution ";
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// cout<< ssrSolution <<":\n";
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for(int n = 0; n < sats; ++n) {
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ClockDelta cd;
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cd.sow = sow;
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cd.udi = udi;
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if(type == 1058) {
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cd.id.gnss = 0;
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cd.id.sigid = 0;
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}
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else if(type == 1241) {
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cd.id.gnss = 2;
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cd.id.sigid = 1;
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}
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int off = 67+76*n;
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cd.id.sv = gbu(off +0, 6);
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/*
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C0 polynomial coefficient for correction of broadcast satellite clock.
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The reference time t0 is Epoch Time (DF385, DF386) plus 1⁄2 SSR
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Update Interval. The reference time t0 for SSR Update Interval “0” is
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Epoch Time
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DF 385: Full seconds since the beginning of the GPS week
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*/
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cd.dclock0 = gbs(off + 6, 22)*1e-4; // in 0.1 mm, this converts to meters
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cd.dclock1 = gbs(off + 28, 21)*1e-6; // meter/s
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cd.dclock2 = gbs(off + 49, 27)*2e-8; // meter/s^2
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d_clocks.push_back(cd);
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// cout<<" "<< makeSatIDName(cd.id)<<" ";
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// cout<< cd.dclock0 <<" ";
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// cout<< cd.dclock1 <<" ";
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// cout<< cd.dclock2 << endl;
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}
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}
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else if(type == 1060 || type == 1243) { // combined
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int sow = gbu(12, 20);
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int udi = gbu(32, 4);
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// int mmi = gbu(36, 1);
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// int srd = gbu(37, 1);
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ssrIOD = gbu(38, 4);
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ssrProvider = gbu(42, 16);
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ssrSolution=gbu(58, 4);
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unsigned int numsats=gbu(62, 6);
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int offset=68;
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d_ephs.clear();
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d_clocks.clear();
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int iodlen = type == 1060 ? 8 : 10;
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for(unsigned int n=0; n < numsats; ++n) {
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ClockDelta cd;
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EphemerisDelta ed;
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int off = offset + n*(197 + iodlen);
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cd.sow = ed.sow = sow;
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cd.udi = ed.udi = udi;
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cd.id.gnss = (type == 1060) ? 0 : 2; // GPS or Galileo
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cd.id.sv = gbu(off + 0, 6);
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cd.id.sigid = (type == 1060) ? 0 : 1;
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ed.id = cd.id;
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ed.iod = gbu(off + 6, iodlen);
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int shift = iodlen - 8;
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ed.radial = gbs(off + 14 + shift, 22 ) * 0.1; // we store this in millimeters
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ed.along = gbs(off + 36 + shift, 20 ) * 0.4;
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ed.cross = gbs(off + 56 + shift, 20 ) * 0.4;
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ed.dradial= gbs(off + 76 + shift, 21) * 0.001; // we store this in mm/s
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ed.dalong = gbs(off + 97 + shift, 19) * 0.004;
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ed.dcross = gbs(off +116 + shift, 19) * 0.004;
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d_ephs.push_back(ed);
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cd.iod = ed.iod;
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cd.dclock0 = gbs(off + 135 + shift, 22)*1e-4; // in 0.1 mm, this converts to meters
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cd.dclock1 = gbs(off + 157 + shift, 21)*1e-6; // meter/s
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cd.dclock2 = gbs(off + 178 + shift, 27)*2e-8; // meter/s^2
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// 205 / 207
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d_clocks.push_back(cd);
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}
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}
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else if(type == 1045 || type == 1046) { // F/NAV or I/NAV respectively ephemeris
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int off=12;
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d_sv = gbum(off, 6);
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d_gm.wn = gbum(off, 12);
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d_gm.iodnav = gbum(off, 10);
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d_gm.sisa = gbum(off, 8);
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off += 14;
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d_gm.t0c = gbum(off, 14);
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d_gm.af2 = gbsm(off, 6);
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d_gm.af1 = gbsm(off, 21);
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d_gm.af0 = gbsm(off, 31);
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/*
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setbitu(rtcm->buff,i,12,1045 ); i+=12;
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setbitu(rtcm->buff,i, 6,prn ); i+= 6;
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setbitu(rtcm->buff,i,12,week ); i+=12;
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setbitu(rtcm->buff,i,10,eph->iode); i+=10;
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setbitu(rtcm->buff,i, 8,eph->sva ); i+= 8;
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setbits(rtcm->buff,i,14,idot ); i+=14;
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setbitu(rtcm->buff,i,14,toc ); i+=14;
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setbits(rtcm->buff,i, 6,af2 ); i+= 6;
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setbits(rtcm->buff,i,21,af1 ); i+=21;
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setbits(rtcm->buff,i,31,af0 ); i+=31;
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*/
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}
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}
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