岸-舰双基地波超视距雷达直达波抑制方法及性能分析

Direct-Path-Interference Suppression and Performance Analysis for Coast-Ship Bistatic SWOTHR

岸-舰双基地波超视距雷达采用岸基阵列发射、舰载单根全向天线接收,且各发射阵元所用载频不同.本文首先分析了该雷达直达波特性,分析表明直达波可看成来自特定距离、特定方位的干扰,具有特定的多普勒频率,据此提出时域、距离-方位域以及多普勒域直达波抑制方法.从运算量、处理增益、输出信干噪比等方面对三种方法的性能进行了分析,计算机仿真以及实测数据结果表明直达波抑制方法的有效性.

Bistatic Surface-Wave Over-the-Horizon Radar（SWOTHR）uses a coast-located array to transmit signals and a ship-carried omnidirectional antenna to receive echoes.In the transmit array,different element utilizes different carrier frequency.The analysis of the direct-path-interference leads to the conclusion that the direct wave is a kind of interference at a position and with a Doppler frequency.Based on the conclusion the interference suppression in time,range-angle and Doppler domain respectively is presented.These three methods for direct wave suppression are evaluated from the aspects of computation complexity,processing gain and output SINR.Finally the simulation and real data results are given to prove the effectivity of these methods.