转发式干扰条件下LFM雷达的检测概率估计

doi:10.12305/j.issn.1001-506X.2024.02.14

系统工程与电子技术 ›› 2024, Vol. 46 ›› Issue (2): 497-504.doi: 10.12305/j.issn.1001-506X.2024.02.14

• 传感器与信号处理 • 上一篇

转发式干扰条件下LFM雷达的检测概率估计

田元荣¹, 王俊迪²^,*, 吴笑天²

1. 国防科技大学电子对抗学院, 安徽合肥 230037
2. 空军工程大学航空工程学院, 陕西西安 710038

收稿日期:2022-04-26 出版日期:2024-01-25 发布日期:2024-02-06
通讯作者: 王俊迪
作者简介:田元荣 (1989—), 男, 讲师, 博士, 主要研究方向为雷达对抗理论与技术、机载电子对抗战术
王俊迪 (1995—), 男, 博士研究生, 主要研究方向为机载电子对抗、机载告警
吴笑天 (1993—), 男, 博士研究生, 主要研究方向为雷达对抗理论与技术、机载末端对抗新技术
基金资助:
国家自然科学基金(62001489)

LFM radar detection probability estimation under repeater jamming

Yuanrong TIAN¹, Jundi WANG²^,*, Xiaotian WU²

1. Institute of Electronic Countermeasure, National University of Defense Technology, Hefei 230037, China
2. Institute of Aeronautics Engineering, Air Force Engineering University, Xi'an 710038, China

Received:2022-04-26 Online:2024-01-25 Published:2024-02-06
Contact: Jundi WANG

摘要/Abstract

摘要：

对多雷达干扰效果评估的难点在于分析干扰机对非目标雷达的影响。针对干扰机转发一部线性调频(linear frequency modulation, LFM)雷达的信号无意干扰另一部LFM雷达时的检测概率估计问题, 首先计算了被干扰雷达对干扰信号在空域、频域和时域上的接收增益; 其次将干扰信号在判决单元中的统计特性建模为非中心卡方分布, 并给出了检测概率和虚警概率的计算方法。仿真结果表明, 在一部干扰机的无意干扰下, 估计的检测概率可作为被干扰雷达检测概率的上限; 为达到同样的干扰效果, 转发非目标雷达的信号实施干扰, 比转发目标雷达的信号进行干扰所需的干扰功率更少。

关键词: 线性调频雷达, 转发干扰, 无意干扰, 雷达检测概率, 非相参积累

Abstract:

The difficulty in evaluating the effectiveness of multi-radar jamming lies in analyzing the impact of jammers on non target radars. In response to the problem of estimating the detection probability when a jammer unintentionally interferes with another linear frequency modulation (LFM) radar by forwarding a signal from one LFM radar, the reception gain of the jammed radar in the spatial, frequency, and time domains of the interference signal is calculated firstly. Secondly, the statistical characteristics of the interference signal in the decision unit are modeled as a non-central chi-square distribution, and the calculation methods for detection probability and false alarm probability are provided. The simulation results show that under the unintentional interference of a jammer, the estimated detection probability can serve as the upper limit of the detection probability of the jammed radar. To achieve the same jamming effect, transmitting signals from non target radars requires less jamming power than transmitting signals from target radars.

Key words: linear frequency modulation (LFM) radar, repeater jamming, unintentional interference, radar detection probability, non-coherent integration

中图分类号:

TN974

田元荣, 王俊迪, 吴笑天. 转发式干扰条件下LFM雷达的检测概率估计[J]. 系统工程与电子技术, 2024, 46(2): 497-504.

Yuanrong TIAN, Jundi WANG, Xiaotian WU. LFM radar detection probability estimation under repeater jamming[J]. Systems Engineering and Electronics, 2024, 46(2): 497-504.

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参数	雷达1	雷达2
探测1 m²目标时发射机输出功率/W	7.92	-
接收机噪声系数/dB	0	-
脉冲宽度/μs	26	35
重频频率/Hz	44 281	34 145
调频带宽/MHz	30	20
波束宽度/(°)	7.35	-
天线增益/dB	20.1	-
非相参积累个数	8	-

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转发式干扰条件下LFM雷达的检测概率估计

LFM radar detection probability estimation under repeater jamming

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