基于EPC-MIMO编码设计的解距离模糊性能分析

doi:10.12305/j.issn.1001-506X.2022.07.12

系统工程与电子技术 ›› 2022, Vol. 44 ›› Issue (7): 2166-2174.doi: 10.12305/j.issn.1001-506X.2022.07.12

基于EPC-MIMO编码设计的解距离模糊性能分析

廖金玲, 廖桂生, 许京伟*, 兰岚

西安电子科技大学雷达信号处理国家重点实验室, 陕西西安 710071

收稿日期:2021-01-13 出版日期:2022-06-22 发布日期:2022-06-28
通讯作者: 许京伟
作者简介:廖金玲 (1997—), 女, 硕士研究生, 主要研究方向为波形分集阵雷达阵元脉冲编码设计和稳健波束形成|廖桂生 (1963—), 男, 教授, 博士研究生导师, 博士, 主要研究方向为阵列信号处理、空时自适应处理、雷达波形设计和天基预警雷达系统|许京伟 (1987—), 男, 副教授, 博士, 主要研究方向为稳健自适应波束形成, 频率分集阵列雷达系统、空时自适应处理和MIMO雷达信号处理|兰岚 (1993—), 女, 准聘副教授, 博士, 主要研究方向为波形分集阵雷达抗干扰
基金资助:
国家自然科学基金(61931016);国家自然科学基金(62071344);国家自然科学基金(61911530246);陕西省青年托举计划(20180103);装备预研重点实验室基金(6142206200210)

Analysis on the performance of resolving range ambiguity based on a coding scheme design for EPC-MIMO

Jinling LIAO, Guisheng LIAO, Jingwei XU*, Lan LAN

National Lab of Radar Signal Processing, Xidian University, Xi'an 710071, China

Received:2021-01-13 Online:2022-06-22 Published:2022-06-28
Contact: Jingwei XU

摘要/Abstract

摘要：

中高脉冲重复频率雷达中, 目标的回波延迟时间大于发射脉冲的重复周期时会导致距离模糊。本文在多输入多输出(multiple-input multiple-output, MIMO)雷达中进行联合发射阵元与脉冲二维编码(element-pulse coding, EPC), 对阵元脉冲编码的设计方法进行了研究, 可实现距离解模糊。对基于Fourier正交基的编码设计进行推广, 提出了一般的EPC方法, 对于 M 个发射阵元, 可获得 M ! 种编码方式。引入期望距离区与模糊距离区的信号模糊比(signal-to-ambiguous-plus-noise ratio, SANR)作为解模糊性能的评估准则, 进行了性能分析。针对角度误差提出了稳健的权矢量优化方法, 进一步提高了解距离模糊的稳健性。仿真实验验证了所提方法的有效性, 不同编码方式在理想情况下均能有效分离不同距离区的目标, 且优化权矢量后 M ! 种编码方式对应的解距离模糊性能相近。

关键词: 多输入多输出雷达, 阵元脉冲编码, 距离模糊, 信号模糊比

Abstract:

In the medium and high pulse repetition frequency radar, the range ambiguity will occur if the time delay of the target's echo is larger than the transmitted pulse repetition time. To deal with this problem, the element-pulse coding (EPC) in joint transmit elements and pulses is performed in multiple-input multiple-output (MIMO) radar, where the scheme of EPC is studied. Firstly, the coding schemes based on the Fourier orthogonal basis are extended, and the general EPC scheme is proposed, where M ! kinds of coding schemes can be obtained with M transmit elements. Then, the range ambiguity resolvability of the EPC-MIMO radar is analyzed with the signal-to-ambiguous-plus-noise ratio (SANR). Finally, the weight vector optimization method corresponding to angle error is proposed, which further improves the robustness of range ambiguity resolution. Simulation examples are provided to confirm the effectiveness of the proposed method, showing that the targets can be effectively separated in different range regions with the proposed coding schemes under ideal conditions. Along the same line of reasoning, after optimizing the weight vector, the performances of range ambiguity resolution for M ! coding schemes are similar.

Key words: multiple-input multiple-output (MIMO) radar, element-pulse coding, range ambiguity, signal-to-ambiguous-plus-noise ratio (SANR)

中图分类号:

TN957.52

廖金玲, 廖桂生, 许京伟, 兰岚. 基于EPC-MIMO编码设计的解距离模糊性能分析[J]. 系统工程与电子技术, 2022, 44(7): 2166-2174.

Jinling LIAO, Guisheng LIAO, Jingwei XU, Lan LAN. Analysis on the performance of resolving range ambiguity based on a coding scheme design for EPC-MIMO[J]. Systems Engineering and Electronics, 2022, 44(7): 2166-2174.

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参数	参数值	参数	参数值
发射阵元数	6	接收阵元数	6
波长/m	0.1	载频/GHz	3
PRF/kHz	20	采样频率/MHz	5
距离门大小/m	30	脉冲数	16
发射阵元间距/m	0.05	接收阵元间距/m	0.05

参数	目标1	目标2	目标3	目标4
角度/(°)	0	0	0	0
距离区号	1	2	3	4
速度/(m·s^-1)	100	100	100	100
SNR/dB	10	10	10	10
主值距离/m	1 000	1 000	1 000	1 000
总距离/m	1 000	8 500	16 000	23 500

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基于EPC-MIMO编码设计的解距离模糊性能分析

Analysis on the performance of resolving range ambiguity based on a coding scheme design for EPC-MIMO

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