Analysis of Cross-polarization Jamming for Phase Comparison Monopulse Radars

The echo signals received by different antenna units are different in phases due to the difference of the wave paths, so phase comparison monopulse radars can produce phase differences accordingly, use phase detectors to detect the azimuth error signals and furthermore capture accurate azimuth and elevation angle information. Compared with conical scanning radars, monopulse radars boast high angular accuracy, fast speed and strong capacity for resisting angle deception jamming. Cross-polarization jamming can make use of the complex structure of the monopulse antenna pattern to generate angle deception jamming. This paper has firstly given the principle for angle measurement of phase comparison monopulse radars, designed the model of the cross-polarization pattern, established the model for angle measurement of the cross-polarization jamming and presented the reduction status of the angle measurement performance in the jamming environment by means of mathematical simulation. It can be seen that antenna pattern has different polarization structure. When the jamming intensity is enough, the cross-polarization jamming will reduce the accuracy of radar angle measurement by 40% which will degrade the tracking performance of radar.