摘要
该文提出基于时间-调频斜率分布(TCD)的目标回波线性调频(LFM)信号的多普勒调频斜率估计算法。分析目标回波LFM信号的TCD表明自项和交叉项均在多普勒调频斜率处取得极大值,采用垂直调频斜率轴投影积分可以有效抑制TCD的非多普勒调频斜率交叉项及噪声,增强多普勒调频斜率项。同时,采用二次搜索方法搜索TCD投影积分量最大值保证多普勒调频斜率估计精度,有效减少运算量;理论分析表明,通过合理控制搜索步长,可以使得计算耗时在一定条件下最小。仿真实验验证了该方法的有效性,该方法具有较高的估计精度以及抗噪性能。
Based on the analysis of the instantaneous phase characteristics of the echo Linear Frequency Modulated（LFM） signals respectively from single and multiple scatter point targets, an algorithm of the Doppler chirp＇s estimation based on the Time-Chirp Distribution（TCD） of echo LFM signals from targets is proposed, in which the projection integral vertical to the chirp axis is adopted to enhance the Doppler chirp＇s term of the TCD, but to suppress non-Doppler chirp＇s cross term of the TCD and noise. Simultaneously, two-time search method is taken to obtain the maximum value of the TCD＇s projection integral to guarantee the estimation accuracy of the Doppler chirp and effectively reduce the amount of computation. The theoretical analysis shows that the time-consuming of calculation can be controlled to the minimum in the appropriate search step. Simulation results show the effectiveness of this method that it has higher estimation accuracy and good immunity for noise.
出处
《电子与信息学报》
EI
CSCD
北大核心
2015年第9期2138-2143,共6页
Journal of Electronics & Information Technology
关键词
信号处理
目标回波
多散射点
线性调频
多普勒调频斜率
时间-调频斜率分布
Signal processing
Target echo
Multiple scatter point
Linear Frequency Modulated（LFM）
Doppler chirp
Time-Chirp Distribution（TCD）
作者简介
通信作者：汪金真wjz_nudt@163．com汪金真：男，1986年生，博士生，研究方向为电子侦察、信号检测及参数估计．
宿绍莹：男，1982年生，讲师，博士，研究方向为电子侦察、信号采集处理及工程化实现．
陈曾平：男，1967年生，博士，教授，博士生导师，研究方向为雷达系统总体设计与目标识别．
