Abstract
The multipath transmission has a serious effect on jamming efficiency in a short distance ECM task for wideband ground radars. After the sidelobe gain model for a large antenna is introduced, the characteristics of multipath channel in time and frequency domain are analysed. The statistical characteristics about the amplitude change of the intercepted pulse signals and the occurrence conditions of frequency selective fading are explained. The short time compatibility between reconnaissance channel and jamming channel is used to pre-distort the jamming signal, and the serious influence of multipath transmission on the jamming signal is greatly eliminated. The fidelity of deception jamming on the radar is greatly improved. The validity of theoretical analysis is verified by simulation experiments. It provides an important theoretical guidance for a short distance electronic counter measures (ECM) task against ground radars.
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