基于离散频率编码的PD雷达二维解模糊方法

doi:10.12305/j.issn.1001-506X.2021.07.02

系统工程与电子技术 ›› 2021, Vol. 43 ›› Issue (7): 1737-1747.doi: 10.12305/j.issn.1001-506X.2021.07.02

• 雷达稀疏信号处理技术专栏 • 上一篇下一篇

基于离散频率编码的PD雷达二维解模糊方法

孙希平¹, 卢景月², 张磊^1,*, 钟卫军³

1. 中山大学电子与通信工程学院, 广东广州 510006
2. 西安电子科技大学电子工程学院, 陕西西安 710071
3. 西北工业大学自动化学院, 陕西西安 710072

收稿日期:2020-11-03 出版日期:2021-06-30 发布日期:2021-07-08
通讯作者: 张磊
作者简介:孙希平(1993—), 男, 博士研究生, 主要研究方向为新体制雷达、雷达信号波形设计与处理|卢景月(1994—), 男, 博士研究生, 主要研究方向为前视SAR成像、阵列雷达信号处理|张磊(1984—), 男, 教授, 博士, 主要研究方向为SAR/ISAR、新体制雷达、雷达目标识别|钟卫军(1982—), 男, 高级工程师, 博士, 主要研究方向为空间目标探测与识别
基金资助:
国家自然科学基金(61771372);国家自然科学基金(61771367)

Two-dimensional ambiguity resolution method of PD radar based on discrete frequency coding

Xiping SUN¹, Jingyue LU², Lei ZHANG^1,*, Weijun ZHONG³

1. School of Electronics and Communication Engineering, Sun Yat-sen University, Guangzhou 510006, China
2. School of Electronic Engineering, Xidian University, Xi'an 710071, China
3. School of Automation, Northwestern Polytechnical University, Xi'an 710072, China

Received:2020-11-03 Online:2021-06-30 Published:2021-07-08
Contact: Lei ZHANG

摘要/Abstract

摘要：

针对脉冲多普勒雷达在中脉冲重复频率下同时存在距离模糊和多普勒模糊问题, 提出了一种基于正交离散频率编码(discrete frequency coding, DFC)波形解二维模糊的方法。基于雷达循环发射的一组正交DFC信号, 在回波脉冲压缩过程中, 利用信号正交性进行距离模糊区域的分离, 完成距离解模糊。通过多普勒模糊数遍历补偿以及与keystone后相参积累结果对比, 确定正确的多普勒模糊数, 完成多普勒解模糊。经过Keystone处理后, 可以进行整个驻留时间的相参积累, 提高回波在低信噪比情况下的目标检测及参数估计能力。同时考虑了DFC信号的多普勒敏感性问题, 在精确匹配滤波过程中补偿了脉内多普勒的影响。仿真实验验证了所提方法解二维模糊的有效性以及低信噪比检测能力。

关键词: 脉冲多普勒雷达, 二维解模糊, 离散频率编码信号, 精确匹配滤波

Abstract:

Aiming at the problem of range ambiguity and Doppler ambiguity in pulse Doppler radar at medium pulse repetition frequency, a method of applying orthogonal discrete frequency coding (DFC) waveforms to airborne PD radars is proposed. Based on the radar cyclically transmits a set of orthogonal DFC waveforms the orthogonality of the signal is used to separate the range ambiguity area and complete the range ambiguity resolution in the process of echo pulse compression. Through the Doppler ambiguity number traversal compensation and the comparison of the keystone coherent accumulation results, the correct Doppler ambiguity number is determined and the Doppler ambiguity resolution is completed. After Keystone processing, the coherent accumulation of the entire dwell time echo signal can be carried out to improve the detection and parameter estimation performance. At the same time, this paper considers the Doppler sensitivity of the DFC signal, and compensates the influence of inter-pulse Doppler in the process of precise matched filtering. Simulation experiments verify the effectiveness of the proposed method.

Key words: pulse Doppler radar, two-dimensional ambiguity resolution, discrete frequency coded waveform, precise matched filtering

中图分类号:

TN958.2

孙希平, 卢景月, 张磊, 钟卫军. 基于离散频率编码的PD雷达二维解模糊方法[J]. 系统工程与电子技术, 2021, 43(7): 1737-1747.

Xiping SUN, Jingyue LU, Lei ZHANG, Weijun ZHONG. Two-dimensional ambiguity resolution method of PD radar based on discrete frequency coding[J]. Systems Engineering and Electronics, 2021, 43(7): 1737-1747.

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参数	数值
载频/GHz	10
DFC编码脉冲数	5
频率码片个数	20
脉冲总带宽/MHz	20
脉冲重复频率/kHz	10
脉冲宽度/μs	20
最大不模糊距离/km	15
最大不模糊速度/(m/s)	±75

序号	编码
1	16, 5, 13, 18, 9, 12, 1, 14, 20, 6, 2, 4, 17, 8, 15, 11, 19, 7, 10, 3
2	8, 11, 20, 2, 14, 10, 12, 16, 7, 13, 5, 18, 6, 17, 3, 9, 4, 19, 1, 15
3	2, 7, 5, 9, 14, 19, 12, 15, 3, 1, 13, 16, 8, 11, 17, 6, 10, 18, 20, 4
4	13, 2, 6, 18, 14, 16, 20, 3, 1, 5, 19, 10, 15, 8, 11, 17, 9, 12, 4, 7
5	20, 3, 9, 17, 1, 4, 13, 16, 5, 18, 10, 6, 8, 12, 19, 15, 11, 14, 7, 2

模糊数	峰值
-1	37.3
0	82.7
1	150.5
2	82.5
3	37.4
4	20.1

方差	算法
方差	多脉冲重频	脉间相位编码	未多普勒补偿DFC	本文方法
距离方差	0.000 2	0.000 5	0.002 6	0.000 1
速度方差	0.592 9	-	0.237 5	0.003 7

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[7]	李磊, 谢拥军, 李晓峰, 陈博韬, 陈潇. 一种探测低飞目标的PD雷达仿真系统[J]. Journal of Systems Engineering and Electronics, 2010, 32(6): 1131-1135.
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基于离散频率编码的PD雷达二维解模糊方法

Two-dimensional ambiguity resolution method of PD radar based on discrete frequency coding

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