Virtual polarisation adaptation a method of increasing the detection capability of a radar system through polarisation-vector processing

The ratio of the average target-signal power to the average unwanted-signal power at the input of a radar detection receiver can be significantly increased by applying the method of clutter/interference suppression described in the paper. The polarisation state of the emissions, the object-backscatter field, and the interference field are all taken into account in a technique referred to as `virtual adaptation¿¿ of the polarisation state of the transmit and receive antennas. This technique can be used to complement filtering techniques in the frequency and space domains. Attention is specifically drawn to the potential advantages of multinotch polarisation suppression filters of the `logic-product¿¿ type, which might have applications in cases where there are uncertainties regarding the polarisation state of unwanted signals that are to be suppressed.