Abstract:

In order to improve the ability of polarization-sensitive arrays to cope with interference from any direction and any polarization state, a polarization-sensitive array analysis and optimization method based on cancellation blind area minimization is proposed. Firstly, based on the space information and polarization domain information of the interference signal, the concept of cancellation blind area is proposed, and the cancellation blind area model of the common-point dual-polarization linear array is established. Then, based on the cancellation blind area model, the mathematical expression of the cancellation blind area is deduced, and the effective cancellation range of the array is quantified, and a solution method based on the infinitesimal method is given. After that, a polarization-sensitive array optimization method based on the cancellation blind area is proposed, which can minimize the cancellation blind area by optimizing the spacing of the array elements. Finally, numerical simulation shows when the detection threshold is 12.6 dB, and the interference frequency is 3 GHz, and the interference to noise ratio (INR) is 50 dB and the signal to noise ratio (SNR) is 20 dB, this method can reduce the proportion of joint domain cancellation blind area of the quadruple common-point dual-polarization linear array to 0.217%, which proves the effectiveness of the optimization method.

Key words: polarization sensitive array, array optimization, interference cancellation, cancellation blind area