LFM相参脉冲串多普勒频率变化率估计  

Doppler Rate Estimation of Coherent LFM Pulse Train

作　　者：陈曦[1] 邓振淼[2] 傅茂忠[2] 

机构地区：[1]四川大学电子信息学院,成都610064 [2]厦门大学信息科学与技术学院,福建厦门361005

出　　处：《现代雷达》2014年第3期29-33,共5页Modern Radar

摘　　要：在传统的只测向单站无源定位算法的基础上,增加波达角变化率和径向加速度两个观测量,可以大大改善定位与跟踪的性能,所以高精度径向加速度估计(即多普勒频率变化率估计)具有重要意义。由于在无源定位里没有接收脉冲信号的任何先验知识,接收到的LFM相参脉冲串信号的相参性容易被破坏。文中借鉴雷达里的匹配滤波方法,提出一种"准匹配滤波"方法,首先估计每个脉冲的到达时间、脉冲宽度、起始频率和调频系数,接着构造本地参考信号用于对接收信号进行"准匹配滤波",最后对其输出进行多普勒频率变化率估计。该方法可以避免处理过程中的非相参问题,运算简单,估计精度高,具有应用价值。The performance of conventional bearing-only single-sensor passive emitter location algorithm can be improved by adding two observed quantities, i. e. , angle-of-arrival （AOA） rate, Doppler rate. Thus accurate radial acceleration estimation, i. e. , Doppler rate estimation, is very important. Since there is no a prior knowledge of the received pulse signals in passive emitter loca- tion, the coherency of the received coherent LFM pulse train is easy to be destroyed. In this paper, a ＇quasi-matched filtering＇ method using the matched filtering in radar for reference is proposed. First, the time of arrival （TOA）, pulse width, initial fre- quency and frequency sweep rate of each pulse are estimated. Then the local reference signal is generated using these estimated pa- rameters and the ＇ quasi-matched filtering＇ is performed to the received signal. Finally, the Doppler rate can be obtained from the output of the filter. The proposed method can avoid the non-coherent problem in processing and has the merits of simple and high accuracy, thus it is valuable in passive emitter location applications.

关 键 词：无源定位 多普勒频率变化率 相参脉冲串 匹配滤波 

分 类 号：TN957.51[电子电信—信号与信息处理]