宽带数字阵列雷达接收通道的优化设计方法研究

宽带数字阵列雷达(WB-DAR)具有模式多变、抗干扰能力强的优势，还兼具高距离分辨力，能够获取未知目标距离像，对目标进行分类和识别。大带宽信号的使用引入了孔径渡越时间的约束，因此，宽带数字阵列雷达需采用基于时延的宽带波束形成方法，以数字时延补偿方式取代传统窄带相控阵中的移相器来形成波束。该文在宽带数字阵列基础上，针对多级抽取结合可变分数时延滤波器的典型接收通道结构，提出了一种新的接收通道优化设计方法。与原方法相比，在满足同样性能要求的情况下，该方法能够降低抗混叠滤波器和分数时延滤波器的阶数，有效地节约了系统硬件资源。

Research on Optimal Design of Receiving Channel in Wideband Digital Array Radar

Wide-band digital array radar (WB-DAR) has not only good performance in anti-interference and multifunction but also the advantage of high range resolution and the ability of target classification and recognition. On the other hand, the large bandwidth signal imposes the constraints of aperture transit time, therefore WB-DAR needs variable fractional delay (VFD) filter to obtain digital delay compensation instead of phase shifter in traditional narrowband phased array for accomplishing beamforming. Based on the typical structure of one receiving channel in WB-DAR, which consists of multiple stage anti-aliasing filters and a variable fractional delay (VFD) filter, a new optimal design method is proposed. Compared with the traditional method, the proposed method can apparently reduce the filter order of receiving channel and maintain the same performance.