一种解决噪声连续波雷达泄漏的新方法  

A new approach to the solution of the leakage in noise continuous wave radar

作　　者：陈金立[1] 顾红[2] 苏卫民[2] 

机构地区：[1]南京信息工程大学电子与信息工程学院,江苏南京210044 [2]南京理工大学电子工程与光电技术学院,江苏南京210094

出　　处：《电波科学学报》2012年第4期720-725,850,共7页Chinese Journal of Radio Science

基　　金：江苏省高校自然科学研究项目资助(No.11KJB510008);南京理工大学自主科研专项计划资助基金(No.2010ZDJH05)

摘　　要：噪声准连续波雷达虽能有效解决发射泄漏问题,但其经调幅断续后的发射波形不再具有时域连续性的特点,不能充分发挥噪声连续波雷达的优势。为此提出在噪声连续波雷达中采用双频发射方式来对消泄漏信号。该雷达的发射信号采用双频发射方式,利用两个载频所调制的泄漏信号的脉压-快速傅里叶变换(FFT)频谱输出数据取模相等这一特点,将两个载频分离通道中取模后的脉压-FFT频谱数据相减,可有效消除泄漏信号及其产生的"噪声基底"。仿真结果表明:双频发射噪声连续波雷达在保留原有连续波雷达信号特点的基础上,其泄漏抑制能力要优于噪声准连续波雷达。Although the noise quasi-continuous wave （CW）radar overcomes the transmit leakage,the transmitted waveform after interrupted amplitude modulation no longer preserves the characteristic of continuity in time domain. Thus the noise quasi-CW radar can not take full advantage of noise CW radar. The dual carrier fre- quencies are applied to noise CW radar for canceling the leakage. In the noise CW radar with the waveform transmitted by dual carrier frequencies, the absolute values of the spectrums after pulse compression-fast Fourier transform（FFT）processing of two leakages modulated by the dual carrier frequencies are equal. So the leakages and the＂noise floor＂ produced by the leakages can be cancelled by subtraction of the absolute values of the spectrums in the two carrier frequencies separated channels. Simulation results are presented to verify that the noise CW radar with dual carrier frequencies has better performance of leakage suppression than noise quasi-CW radar,while preserving the characteristic of the original radar signal.

关 键 词：噪声雷达 泄漏抑制 双发射频率 准连续波雷达 

分 类 号：TN957.51[电子电信—信号与信息处理]