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Front-end calibration utility is now fully operative for the following front-ends:

Browse Source 
- RTLS-SDR + Elonics E4000

Some bug correction in PCPS acquisition

git-svn-id: https://svn.code.sf.net/p/gnss-sdr/code/trunk@398 64b25241-fba3-4117-9849-534c7e92360d
This commit is contained in:
Javier Arribas
2013-07-30 10:53:45 +00:00
parent 8b10549fee
commit 9bfd2bb32a
8 changed files with 207 additions and 204 deletions
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109
src/utils/front-end-cal/main.cc
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@@ -80,7 +80,7 @@ using google::LogMessage;
DECLARE_string(log_dir);
DEFINE_string(config_file, "../conf/gnss-sdr.conf",
DEFINE_string(config_file, "../conf/front-end-cal.conf",
"Path to the file containing the configuration parameters");
concurrent_queue<Gps_Ephemeris> global_gps_ephemeris_queue;
@@ -123,10 +123,10 @@ void wait_message()
{
case 1: // Positive acq
gnss_sync_vector.push_back(*gnss_synchro);
acquisition->reset();
//acquisition->reset();
break;
case 2: // negative acq
acquisition->reset();
//acquisition->reset();
break;
case 3:
stop=true;
@@ -162,7 +162,7 @@ bool front_end_capture(ConfigurationInterface *configuration)
/ (GPS_L1_CA_CODE_RATE_HZ / GPS_L1_CA_CODE_LENGTH_CHIPS));
int nsamples=samples_per_code*50;
int skip_samples=fs_in_; // skip 5 seconds
int skip_samples=fs_in_*5; // skip 5 seconds
gr::block_sptr head = gr::blocks::head::make(sizeof(gr_complex), nsamples);
@@ -190,6 +190,19 @@ bool front_end_capture(ConfigurationInterface *configuration)
}
static time_t utc_time(int week, long tow) {
time_t t;
/* Jan 5/6 midnight 1980 - beginning of GPS time as Unix time */
t = 315964801;
/* soon week will wrap again, uh oh... */
/* TS 44.031: GPSTOW, range 0-604799.92, resolution 0.08 sec, 23-bit presentation */
t += (1024 + week) * 604800 + tow*0.08;
return t;
}
int main(int argc, char** argv)
{
const std::string intro_help(
@@ -215,7 +228,7 @@ int main(int argc, char** argv)
<< "/tmp"
<< std::endl
<< "Use gnss-sdr --log_dir=/path/to/log to change that."
<< "Use front-end-cal --log_dir=/path/to/log to change that."
<< std::endl;
}
else
@@ -243,7 +256,17 @@ int main(int argc, char** argv)
configuration= new FileConfiguration(FLAGS_config_file);
front_end_cal.set_configuration(configuration);
// Capture file
// 2. Get SUPL information from server: Ephemeris record, assistance info and TOW
if (front_end_cal.get_ephemeris()==true)
{
std::cout<<"SUPL data received OK!"<<std::endl;
}else{
std::cout<<"Failure connecting to SUPL server"<<std::endl;
}
// 3. Capture some front-end samples to hard disk
if (front_end_capture(configuration))
{
@@ -252,7 +275,7 @@ int main(int argc, char** argv)
std::cout<<"Failure capturing front-end samples"<<std::endl;
}
// 3. Setup GNU Radio flowgraph (RTL-SDR -> Acquisition_10m)
// 4. Setup GNU Radio flowgraph (file_source -> Acquisition_10m)
gr::top_block_sptr top_block;
boost::shared_ptr<gr::msg_queue> queue;
@@ -297,7 +320,9 @@ int main(int argc, char** argv)
std::cout<<"Failure connecting the GNU Radio blocks "<<std::endl;
}
// 4. Run the flowgraph
// 5. Run the flowgraph
// Get visible GPS satellites (positive acquisitions with Doppler measurements)
// Compute Doppler estimations
std::map<int,double> doppler_measurements_map;
std::map<int,double> cn0_measurements_map;
@@ -321,7 +346,7 @@ int main(int argc, char** argv)
top_block->run();
if (start_msg==true)
{
std::cout<<"Searchig for GPS Satellites..."<<std::endl;
std::cout<<"Searching for GPS Satellites in L1 band..."<<std::endl;
std::cout<<"[";
start_msg=false;
}
@@ -354,46 +379,68 @@ int main(int argc, char** argv)
<< ((double)(end - begin))/1000000.0
<< " [seconds]" << std::endl;
// 5. Get visible GPS satellites (positive acquisitions with Doppler measurements)
// 2. Get SUPL information from server: Ephemeris record, assistance info and TOW
front_end_cal.get_ephemeris();
// 6. Compute Doppler estimations
//find TOW from SUPL assistance
//6. find TOW from SUPL assistance
double current_TOW=0;
if (global_gps_ephemeris_map.size()>0)
{
std::map<int,Gps_Ephemeris> Eph_map;
Eph_map=global_gps_ephemeris_map.get_map_copy();
current_TOW=Eph_map.begin()->second.d_TOW;
std::cout<<"Current TOW obtained from SUPL assistance = "<<current_TOW<<std::endl;
}else{
std::cout<<"Unable to get Ephemeris SUPL assistance. TOW is unknown!"<<std::endl;
}
if (global_gps_ephemeris_map.size()>0)
{
std::map<int,Gps_Ephemeris> Eph_map;
Eph_map=global_gps_ephemeris_map.get_map_copy();
current_TOW=Eph_map.begin()->second.d_TOW;
time_t t = utc_time(Eph_map.begin()->second.i_GPS_week, (long int)current_TOW);
fprintf(stdout, "Reference Time:\n");
fprintf(stdout, " GPS Week: %ld\n", Eph_map.begin()->second.i_GPS_week);
fprintf(stdout, " GPS TOW: %ld %lf\n", (long int)current_TOW, (long int)current_TOW*0.08);
fprintf(stdout, " ~ UTC: %s", ctime(&t));
std::cout<<"Current TOW obtained from SUPL assistance = "<<current_TOW<<std::endl;
}else{
std::cout<<"Unable to get Ephemeris SUPL assistance. TOW is unknown!"<<std::endl;
delete configuration;
delete acquisition;
delete gnss_synchro;
google::ShutDownCommandLineFlags();
std::cout << "GNSS-SDR Front-end calibration program ended." << std::endl;
return 0;
}
//Get user position from config file (or from SUPL using GSM Cell ID)
double lat_deg = configuration->property("GNSS-SDR.init_latitude_deg", 41.0);
double lon_deg = configuration->property("GNSS-SDR.init_longitude_deg", 2.0);
double altitude_m = configuration->property("GNSS-SDR.init_altitude_m", 100);
std::cout<<"Reference location (defined in config file):"<<std::endl;
std::cout<<"Latitude="<<lat_deg<<" [º]"<<std::endl;
std::cout<<"Longitude="<<lon_deg<<" [º]"<<std::endl;
std::cout<<"Altitude="<<altitude_m<<" [m]"<<std::endl;
if (doppler_measurements_map.size()==0)
{
std::cout<<"Sorry, no GPS satellites detected in the front-end capture, please check the antenna setup..."<<std::endl;
delete configuration;
delete acquisition;
delete gnss_synchro;
google::ShutDownCommandLineFlags();
std::cout << "GNSS-SDR Front-end calibration program ended." << std::endl;
return 0;
}
std::map<int,double> f_if_estimation_Hz_map;
std::map<int,double> f_fs_estimation_Hz_map;
std::map<int,double> f_ppm_estimation_Hz_map;
std::cout <<std::setiosflags(std::ios::fixed)<<std::setprecision(2)<<
std::cout <<std::setiosflags(std::ios::fixed)<<std::setprecision(2)<<
"Doppler analysis results:"<<std::endl;
std::cout << "SV ID Measured [Hz] Predicted [Hz]" <<std::endl;
for (std::map<int,double>::iterator it = doppler_measurements_map.begin() ; it != doppler_measurements_map.end(); ++it)
{
//std::cout << "Doppler measured for (SV=" << it->first<<")="<<it->second<<" [Hz]"<<std::endl;
try{
double doppler_estimated_hz;
doppler_estimated_hz=front_end_cal.estimate_doppler_from_eph(it->first,current_TOW,lat_deg,lon_deg,altitude_m);
//std::cout << "Doppler estimated for (SV=" << it->first<<")="<<doppler_estimated_hz<<" [Hz]"<<std::endl;
std::cout << " "<<it->first<<" "<<it->second<<" "<<doppler_estimated_hz<<std::endl;
// 7. Compute front-end IF and sampling frequency estimation
// Compare with the measurements and compute clock drift using FE model
@@ -406,7 +453,6 @@ int main(int argc, char** argv)
}catch(int ex)
{
//std::cout<<"Eph not found for SV "<<it->first<<std::endl;
std::cout << " "<<it->first<<" "<<it->second<<" (Eph not found)"<<std::endl;
}
}
@@ -428,9 +474,6 @@ int main(int argc, char** argv)
mean_fs_Hz/=n_elements;
mean_osc_err_ppm/=n_elements;
std::cout <<std::setiosflags(std::ios::fixed)<<std::setprecision(2)<<"FE parameters estimation for Elonics E4000 Front-End:"<<std::endl;
std::cout<<"Sampling frequency ="<<mean_fs_Hz<<" [Hz]"<<std::endl;