Strong complex echo removal in noise radar

A continuous wave noise radar receives all the echoes simultaneously. Thus, strong echoes of nearby targets mask the weak echoes of far targets. Even if the echoes are separated in Doppler and in range, the strong echo produces relatively high sidelobes at the output of the correlation receiver. The sidelobes may prevent the detection of a weaker echo. Classical methods of strong echo removal, based on point scatterer model and successive subtraction of modelled strong echoes, may fail if the strong echo is not a single reflecting point. In the paper, a new method of handling a complex strong echo is introduced, along with computer simulation results. The proposed method is based on a joint modelling of a multipoint target echo.