用于直升机跟踪的自混频信号积累性能分析  

Integration Performance of Self-mixing Signal for Helicopter Tracking

作　　者：孟飞[1] 曹宇飞[1] 李饶辉[1] 谢良贵[1] 

机构地区：[1]中国航天科工集团二院第二十三研究所,北京100854

出　　处：《现代雷达》2009年第3期31-33,37,共4页Modern Radar

摘　　要：在单脉冲体制跟踪悬停直升机时,提出一种采用自混频方式来消除旋翼对信号调制的方法。推导全相参和部分相参2种信号的时域、频域表达式,对其频谱进行分析。对二者的积累效果进行分析,通过仿真可知部分相参信号当载频在某些特定值时积累效果和全相参信号是相同的,其他情况下相差很多。When using monopulse method for tracking a hovering helicopter, a self-mixing method is proposed to eliminate signal modulation caused by rotor. The expressions in time and frequency domains of two coherent signals are derived, and the characteristics of frequency spectrum is analyzed. Both coherent signal integration performances are analyzed. Simulation results show that the integration performances are equivalent only for some carrier frequencies of partly coherent signal, and the performance of partly coherent signal is worse for other situations.

关 键 词：全相参 部分相参 自混频 频谱 积累 

分 类 号：TN957.5[电子电信—信号与信息处理]