基于二维DFT的相参脉冲串频率估计  

Frequency Estimation of the Coherent Pulses Train Based on 2-Dimension DFT

作　　者：易舟维 李其勤 YI Zhouwei;LI qiqin(Science and Technology on Electronic Information Control Laboratory,Chengdu 610036,China)

机构地区：[1]电子信息控制重点实验室,成都610036

出　　处：《电子信息对抗技术》2020年第4期34-38,共5页Electronic Information Warfare Technology

摘　　要：雷达脉冲频率测量是一个重要研究课题。基于单脉冲测频的方法受到脉冲宽度的限制,测量精度非常有限。基于相参脉冲串的频率测量技术可以有效利用脉冲在时间上的分布,提高测量精度。之前的研究主要集中在单音脉冲,或针对特定的脉内调制方式。提出基于二维DFT变化的频率估计算法,可适用于任意波形。通过粗估和精估两步,实现无周期模糊的高精度频率估计。分析频率粗估值的估计误差,给出正确解模糊的相应条件。在频率精估方面,提出可适应于任意扩零长度的DFT单音频率差值估计方法。The frequency estimation of the radar pulses is of great importance.The performance of the estimation based on the single pulse is extraordinary limited by the width of the pulse.The estimation based on the coherent pulses train would reach a much better performance due to the large span on time domain of the pulses.The former studies mainly focus on mono-tone pulse,or some particular on pulse modulation.The algorithm based on the 2-dimension discrete Fourier Transform is proposed.This algorithm is valid for arbitrary waveform.The final unambiguous estimation is reached after coarse estimation and fine estimation.The analysis on the error of the coarse estimation is provided,and the condition under which the ambiguity can be solved correctly is provided.An interpolation algorithm is provided for the fine estimation,and this algorithm is valid for arbitrarily zero-padded discrete Fourier Transform.

关 键 词：相参脉冲串 频率估计 二维DFT 

分 类 号：TN971.1[电子电信—信号与信息处理]