Processing bipolar radar data via cross spectral analysis
OwnerJacques TESTUD, Erwan LE BOUARinventors
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Abstract
The invention concerns processing which implements the following steps to estimate polarimetric parameters: In the cross power spectrum, identifying signal-containing lines and lines only containing noise; From the power spectra of each channel and from the cross power spectrum, deleting lines at the frequencies identified as only containing noise in the cross power spectrum; Calculating polarimetric parameters as a function of the power spectra thus corrected. Application to weather radars and other types of bipolar radars having coherent reception.
Claims6
A method for determining information on physical parameters observable by a bipolar radar having coherent reception, able to transmit series of pulses and to receive and sample a return signal,
- wherein at least one processing unit implements the following steps to estimate polarimetric parameters
- Determining time series of the analytical signal for both transmission channels H and V;
- From these time series, calculating Fourier transforms of the analytical signal on these two channels H and V;
- From these Fourier transforms, calculating the power spectra of each channel HH, VV, and the cross power spectrum HV;
- In the cross power spectrum, identifying signal-containing lines and lines only containing noise;
- Deleting from the power spectra of each channel and from the cross power spectrum those lines at the frequencies identified as only containing noise in the cross power spectrum;
- Calculating polarimetric parameters as a function of the power spectra thus corrected,
- and wherein determination of information on observable physical parameters is also implemented by processing these polarimetric parameters.
A computer program product comprising instructions adapted to implement steps of a method for determining information on physical parameters observable by a bipolar radar having coherent reception, able to transmit series of pulses and to receive and sample a return signal,
- said steps comprising the following steps to estimate polarimetric parameters
- Determining time series of the analytical signal for both transmission channels H and V;
- From these time series, calculating Fourier transforms of the analytical signal on these two channels H and V;
- From these Fourier transforms, calculating the power spectra of each channel HH, VV, and the cross power spectrum HV;
- In the cross power spectrum, identifying signal-containing lines and lines only containing noise;
- Deleting from the power spectra of each channel and from the cross power spectrum those lines at the frequencies identified as only containing noise in the cross power spectrum;
- Calculating polarimetric parameters as a function of the power spectra thus corrected,
- and wherein determination of information on observable physical parameters is also implemented by processing these polarimetric parameters.
Dependencies are inferred from the claim text.