Polarisation behaviour off ground clutter during dwell time

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Abstract
The paper analyses the behaviour of ground clutter during dwell time in a lowresolution radar. The analysis is made with reference to measurements made through a pulse radar using right-handed circular polarisation at transmit and two orthogonally circularly polarised channels on reception. Symmetric and asymmetric distribution of polarisation with respect to its average is pointed out for two different types of ground clutter, the ‘clustered clutter’ and the ‘distributed clutter’. Suitable parameters are defined and evaluated for statistical analysis of the experimental data to characterise and classify the observed phenomena. Frequent scan-to-scan stationarity of ground clutter polarisation is highlighted, which makes the statistical analysis meaningful for the application of suitable adaptive polarisation filtering techniques for ground clutter rejection.

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