mirrors/gnss-sdr
1
0
Fork 0
mirror of https://github.com/gnss-sdr/gnss-sdr synced 2025-04-06 02:37:20 +00:00
Code Issues Releases Wiki Activity

Accelerate CN0 estimation

Browse Source
This commit is contained in:
Carles Fernandez 2019-04-25 14:58:30 +02:00
parent 50d4db9c05
commit 42c0544c4c
2 changed files with 12 additions and 12 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

22
src/algorithms/tracking/libs/lock_detectors.cc
View File

@ -65,23 +65,23 @@
* where \f$T_{int}\f$ is the coherent integration time, in seconds.
*
*/
float cn0_svn_estimator(const gr_complex* Prompt_buffer, int length, double coh_integration_time_s)
float cn0_svn_estimator(const gr_complex* Prompt_buffer, int length, float coh_integration_time_s)
{
double SNR = 0.0;
double SNR_dB_Hz = 0.0;
double Psig = 0.0;
double Ptot = 0.0;
float SNR = 0.0;
float SNR_dB_Hz = 0.0;
float Psig = 0.0;
float Ptot = 0.0;
for (int i = 0; i < length; i++)
{
Psig += std::abs(static_cast<double>(Prompt_buffer[i].real()));
Ptot += static_cast<double>(Prompt_buffer[i].imag()) * static_cast<double>(Prompt_buffer[i].imag()) + static_cast<double>(Prompt_buffer[i].real()) * static_cast<double>(Prompt_buffer[i].real());
Psig += std::abs(Prompt_buffer[i].real());
Ptot += Prompt_buffer[i].imag() * Prompt_buffer[i].imag() + Prompt_buffer[i].real() * Prompt_buffer[i].real();
}
Psig /= static_cast<double>(length);
Psig /= static_cast<float>(length);
Psig = Psig * Psig;
Ptot /= static_cast<double>(length);
Ptot /= static_cast<float>(length);
SNR = Psig / (Ptot - Psig);
SNR_dB_Hz = 10.0 * log10(SNR) - 10.0 * log10(coh_integration_time_s);
return static_cast<float>(SNR_dB_Hz);
SNR_dB_Hz = 10.0 * std::log10(SNR) - 10.0 * std::log10(coh_integration_time_s);
return SNR_dB_Hz;
}

2
src/algorithms/tracking/libs/lock_detectors.h
View File

@ -72,7 +72,7 @@
* IEEE 10th International Symposium on Spread Spectrum Techniques and
* Applications, pp.28-30, August 2008.
*/
float cn0_svn_estimator(const gr_complex* Prompt_buffer, int length, double coh_integration_time_s);
float cn0_svn_estimator(const gr_complex* Prompt_buffer, int length, float coh_integration_time_s);
/*! \brief A carrier lock detector