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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
1 changed files with 8 additions and 4 deletions
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12
src/algorithms/tracking/libs/lock_detectors.cc
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@@ -122,12 +122,16 @@ float cn0_mm_estimator(const gr_complex* Prompt_buffer, int length, float coh_in
m_2 /= n; m_2 /= n;
m_4 /= n; m_4 /= n;
aux = std::sqrt(2.0 * m_2 * m_2 - m_4); aux = std::sqrt(2.0 * m_2 * m_2 - m_4);
SNR_aux = aux / (m_2 - aux); if (std::isnan(aux))
SNR_dB_Hz = 10.0 * std::log10(SNR_aux) - 10.0 * std::log10(coh_integration_time_s);
if (std::isnan(SNR_dB_Hz))
{ {
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; return SNR_dB_Hz;
} }