Compound G2 model of coherent radar sea clutter

Comparison of bi‐modal coherent sea clutter simulation techniques

“…Verification of each model is achieved by comparing a number of statistical measures over a range of swell angles and polarisations. It extends the work in [7, 8] by greatly expanding the discussion in each section of the paper and including a comparison of the updated compound G2 model described by Bocquet [9] with results for different polarisations and azimuth angles.…”

“…The compound G2 model was presented in [8] and further extended in [9]. It comprises features from both the STLC and evolving Doppler models.…”

“…The distribution of clutter power, or texture, was obtained from the intensities of these individual spectra and modelled with the G2 PDF in (21). The shape parameters and the slow component proportion were estimated from this distribution, using the constrained maximum likelihood estimator described in Appendix 10.2 of [9]. Examples of the G2 model distribution fits to the texture distribution are shown in Fig.…”

“…The component centre frequencies , widths , and uniform widths were estimated by simultaneous fitting of the mean Doppler and variance spectra to the spectrum model, as described in [9]. In these fits, the shape parameters and proportion were fixed to the values estimated from the texture distribution.…”

“…The overall local clutter power or texture is then distributed as the sum of these two gamma variates. This model has been extended in [9] with details of how it can be used to simulate sea clutter.…”