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Fix estimation of CN0 for low values

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This commit is contained in:
Carles Fernandez 2019-09-17 00:58:34 +02:00
parent f3d502dc45
commit 2832c5d379
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GPG Key ID: 4C583C52B0C3877D
1 changed files with 8 additions and 4 deletions

12
src/algorithms/tracking/libs/lock_detectors.cc

@ -122,12 +122,16 @@ float cn0_mm_estimator(const gr_complex* Prompt_buffer, int length, float coh_in
m_2 /= n;
m_4 /= n;
aux = std::sqrt(2.0 * m_2 * m_2 - m_4);
SNR_aux = aux / (m_2 - aux);
SNR_dB_Hz = 10.0 * std::log10(SNR_aux) - 10.0 * std::log10(coh_integration_time_s);
if (std::isnan(SNR_dB_Hz))
if (std::isnan(aux))
{
SNR_dB_Hz = Psig / (m_2 - Psig);
SNR_aux = Psig / (m_2 - Psig);
}
else
{
SNR_aux = aux / (m_2 - aux);
}
SNR_dB_Hz = 10.0 * std::log10(SNR_aux) - 10.0 * std::log10(coh_integration_time_s);
return SNR_dB_Hz;
}