Abstract
The relationship between the output signal to jamming and noise ratio (SJNR) of frequency diverse array (FDA) and the correlation coefficient between the jamming and signal steering vector are deduced. The influence of the change of signal and jamming position on the output SINR is obtained. When jamming is located in mainlobe, the improper frequency interval will sharply reduce the output SINR and form a null. The detection ability of the FDA radar will also drop sharply and the null will change periodically with the selection of frequency interval. Both the theories and simulations verified this periodic null and demonstrated the necessity for selecting FDA’s optimal frequency interval.
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