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reverting wrong change

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This commit is contained in:
Carles Fernandez 2015-11-27 14:06:30 +01:00
parent 2a6381c6fa
commit df6996f3b1
1 changed files with 5 additions and 9 deletions
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14
src/algorithms/tracking/libs/lock_detectors.cc
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@ -73,20 +73,16 @@ float cn0_svn_estimator(gr_complex* Prompt_buffer, int length, long fs_in, doubl
float SNR_dB_Hz = 0; float SNR_dB_Hz = 0;
float Psig = 0; float Psig = 0;
float Ptot = 0; float Ptot = 0;
float Psig2, Ptot2, SNR_dB_Hz2; Psig2=0; Ptot2=0;
for (int i=0; i<length; i++) for (int i=0; i<length; i++)
{ {
Psig += Prompt_buffer[i].real() * Prompt_buffer[i].real(); //std::abs(Prompt_buffer[i].real()); Psig += std::abs(Prompt_buffer[i].real());
Psig2 += std::abs(Prompt_buffer[i].real());
Ptot += Prompt_buffer[i].imag() * Prompt_buffer[i].imag() + Prompt_buffer[i].real() * Prompt_buffer[i].real(); Ptot += Prompt_buffer[i].imag() * Prompt_buffer[i].imag() + Prompt_buffer[i].real() * Prompt_buffer[i].real();
} }
Psig2 = Psig2 / (float)length;// Psig = Psig / (float)length;
Psig2 = Psig2 * Psig2;// Psig = Psig * Psig;
Ptot2 = Ptot / (float)length;// Ptot = Ptot / (float)length;
SNR = Psig / (Ptot - Psig); SNR = Psig / (Ptot - Psig);
SNR_dB_Hz = 10 * log10(Psig2 / (Ptot2 - Psig2)) + 10 * log10(fs_in/2) - 10 * log10((float)code_length * 1023000 /fs_in ); // 10 * log10(SNR) + 10 * log10(fs_in/2) - 10 * log10((float)code_length); SNR_dB_Hz = 10 * log10(SNR) + 10 * log10(fs_in/2) - 10 * log10((float)code_length);
SNR_dB_Hz2 = 10 * log10(Psig2 / (Ptot2 - Psig2)) + 10 * log10(fs_in/2) - 10 * log10((float)code_length);
//std::cout << "CNO = " << SNR_dB_Hz << " old: " << SNR_dB_Hz2 << " code_length: " << code_length << std::endl;
return SNR_dB_Hz; return SNR_dB_Hz;
} }