PGA算法解相位污染虚假目标问题的研究  

Study on False Target in Ionospheric Phase Perturbation Correction using PGA

作　　者：王春宇[1] 位寅生[1] 许荣庆[1] 

机构地区：[1]哈尔滨工业大学电子工程技术研究所,黑龙江哈尔滨150001

出　　处：《微计算机信息》2009年第7期188-190,共3页Control & Automation

摘　　要：电离层相位污染使天波超视距雷达(OTHR)回波信号的多普勒谱展宽,从而严重影响了雷达对目标的检测性能。相位梯度法(PGA)是现有的一种性能较好的解污染算法,但是当Bragg峰附近存在目标时,解污染后的回波谱会出现虚假目标,这严重影响了PGA算法的实际应用。本文从理论上分析了虚假目标的成因,提出采取分别利用正负Bragg峰进行PGA处理的方法,从而能有效地检测出这种情况下的真实目标。最后,本文给出了仿真结果,证明了该方法的有效性。The ionospheric phase perturbation can produce Doppler spectrum spread of the OTHR received echoes, leading to severe degradation of the target detection capability of OTHR. PGA is an existing algorithm to correct phase perturbation that has better performancc, but false targets will appear in decontaminated echo spectrum when real targets are near Bragg peaks. This severe degrades the practicality of PGA. This paper gives a theoretical analysis of causes of the false targets and proposes the method that can effec- tively detect the real targets using PGA algorithm by positive and negative Bragg peaks. Finally. the simulation examples are presented and prove effectiveness of this method.

关 键 词：天波超视距雷达(OTHR) 相位污染校正 相位梯度法(PGA) 

分 类 号：TN011.2[电子电信—物理电子学]