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针对宽带数字阵雷达相位扫描时的孔径渡越问题,分别研究了针对宽带线性调频信号的上行链路移频移相和下行链路整数和分数阶延时相结合的单元级数字延时方法,克服了宽带数字阵雷达由于方位大角度扫描导致的波束色散、增益下降问题,替代模拟延时线补偿方法,降低了雷达系统的结构复杂度和系统重量。文中通过分析并计算了上行链路需要的移频量和移相量、以及数字有限冲击响应滤波器延时的响应特性,并通过仿真验证了上、下行链路补偿的效果。
Aiming at the problem of aperture crossover in wideband digital array radar phase scanning, a unit-level digital delay method combining uplink frequency shift phase shift and downlink integer and fractional delay for wideband chirp signals is studied respectively. The invention overcomes the problem of beam dispersion and gain reduction caused by wide-angle azimuth scanning of a wideband digital radar, and replaces the analog delay line compensation method to reduce the structural complexity and system weight of the radar system. In this paper, we analyzed and calculated the frequency shift and the phase shift needed for the uplink, and the response characteristics of the digital finite impulse response filter delay. The simulation results verify the effect of uplink and downlink compensation.