机载雷达传统DPCA方法统一模型与性能分析

General Model and Performance Analysis of Traditional DPCA Methods for Airborne Radar

偏置相位中心天线(DPCA)技术通过对杂波多普勒频率导致的杂波信号脉冲间相移进行补偿,从而实现了对机载雷达强杂波的有效抑制。物理位置上的DPCA和电子DPCA是两类传统的DPCA方法,其具体实现方式和适用范围不尽相同,但却具有深刻的内在联系。为进一步完善传统DPCA的理论框架,理清两类DPCA方法之间的本质关系,文中将传统DPCA的处理流程归纳为子相参处理间隔选取、波束形成、杂波对消和多普勒滤波四个步骤,以此建立了传统DPCA方法统一模型,并结合统一模型对现有两类传统DPCA方法的机理和效能进行了比较。最后通过计算机仿真验证了统一模型的有效性和相关理论分析的正确性。

The displaced phase center antenna(DPCA)technique is able to suppress the strong clutter for airborne radar by compensating the phase difference between consecutive two pulses which is induced by the clutter Doppler frequency.Physical DPCA and electronic DPCA are two traditional DPCA methods.Their scope of application is different,but they have deep internal relations.For the purpose of perfecting the theoretical framework of DPCA,and clearing up the relationship between two main DPCA methods,a general DPCA model is developed in this paper.The process of DPCA is summarized into 4 steps,which includes the sub coherent processing interval selection,beamforming,clutter cancellation and Doppler filtering.With this model,the mechanisms and effectiveness of the traditional two main DPCA methods are compared.Finally,the effectiveness of the proposed general DPCA model and the relevant theoretical analysis are verified by computer simulation.