Adaptive Transmit Power Allocation for FDA Radar With Spectral Interference Avoidance

In this paper, we first establish a spectral interference model for frequency diverse array (FDA) radar, with a focus on the interference covariance matrix structure. Then, we show that the FDA radar has a capability in suppressing spectral interferences, even if they enter through the receiver mainlobe. In order to improve the suppression performance, we further design a transmit weight vector for adaptive element-wise power allocation, through maximizing the output signal-to-interference-plus-noise ratio (SINR). Numerical results demonstrate that the FDA radar with adaptive power allocation is able to avoid those spectral interferences via adjusting its transmit spectrum. The resulting output SINR is higher than those of the FDA with uniform power allocation, conventional phased-array (PA) and multi-input multi-output (MIMO) radars.