低信噪比下离散频率编码波形脉冲信号联合积累检测算法

魏嵩; 张磊; 马岩; 钟卫军

doi:10.11999/JEIT211619

低信噪比下离散频率编码波形脉冲信号联合积累检测算法

doi: 10.11999/JEIT211619

魏嵩¹,
张磊^1, ,,
马岩²,
钟卫军³

1.
中山大学电子与通信工程学院深圳 518107
2.
北京跟踪与通信技术研究所北京 100094
3.
西安卫星测量中心西安 710071

基金项目: 国家自然科学基金(62101603)

详细信息

作者简介:
魏嵩：男，博士生，主要研究方向为雷达电子侦察信号分析与处理

张磊：男，教授，主要研究方向为雷达SAR/ISAR成像与运动补偿

马岩：男，副研究员，主要研究方向为光电信息处理与分析、目标特性与识别

钟卫军：男，高级工程师，主要研究方向为太空态势感知信息处理、目标特性与识别

通讯作者:
张磊　zhanglei57@mail.sysu.edu.cn

中图分类号: TN95; TN911.23
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- 被引次数: 0
出版历程
- 收稿日期: 2021-12-31
- 修回日期: 2022-05-10
- 录用日期: 2022-06-08
- 网络出版日期: 2022-06-13
- 刊出日期: 2023-03-10

Robust Joint Accumulation and Detection for Discrete Frequency Coded Waveform Signals at Low Signal-to-Noise Ratio

1.
School of Electronics and Communication Engineering, Shenzhen Campus of Sun Yat-sen University, Shenzhen 518107, China
2.
Beijing Institute of Tracking Telemetry and Telecommunication, Beijing 100094, China
3.
Xi’an Satellite Control Center, Xi’an 710071, China

Funds: The National Natural Science Foundation of China (62101603)

摘要

摘要: 雷达电子侦察环境下，非合作目标发射的离散频率编码(DFC)波形信号具有低截获、抗干扰的特性，在低信噪比(SNR)条件下传统方法难以实现波形的稳健积累及准确的脉冲检测，容易造成数据漏检与情报缺失。针对以上问题，该文提出一种联合的积累检测算法，该算法通过相关积累和非相干积累的联合处理实现了低信噪比下稳健脉冲信号包络的获取，并利用双向恒虚警(CFAR)检测和脉冲沿判决准则抑制了突跳噪声对脉冲检测的影响，实现了准确而稳健的脉冲到达时间和脉冲宽度的估计。相比于常规算法，该文在不需要任何先验信息的条件下能够实现离散频率编码波形信号的准确检测，检测虚警率低且具有良好的稳健性。仿真实验验证了所提算法的有效性和稳健性。
- 脉冲检测 /
- 参数估计 /
- 相关积累 /
- 恒虚警 /
- 离散频率编码信号
Abstract: In the radar electronic reconnaissance environment, the Discrete Frequency Coded (DFC) waveform signals emitted by non-cooperative targets with low probability of interception and anti-interference is hard to be accumulated and detected under low Signal-to-Noise Ratio (SNR) conditions. Consequently, a joint accumulation and detection algorithm is proposed in this paper. First, correlated accumulation and incoherent accumulation are jointly used to obtain signal envelopes from low SNR environments. Then, the bi-directional Constant False Alarm Rate (CFAR) threshold and pulse edge decision criteria are used to detect pulses and estimate accurate time of arrival and pulse width. Compared with conventional algorithms, the proposed algorithm could realize the accurate detection of discrete frequency coded waveform signals without any prior information, with low detection false alarm rate and good robustness. Simulation experiments verify the effectiveness and robustness of the algorithm in this paper.
- Pulse detection /
- Parameter estimation /
- Correlated accumulation /
- Constant False Alarm Rate (CFAR) /
- Discrete Frequency Coded (DFC) signal

HTML全文

图 1 CFAR检测示意图

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图 2 DFC波形信号的时频分布示意图

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图 3 各波形相关积累信号向量相加示意图

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图 4 低信噪比DFC波形信号脉冲积累检测算法流程

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图 5 信号检测判决示意图

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图 6 DFC波形信号积累检测结果

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图 7 多种信噪比下脉冲积累检测性能对比曲线

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表 1 仿真DFC雷达信号波形参数

参数名称参数值

采样率 300 MHz
脉冲重复时间 120 μs
脉冲宽度 30 μs
起始频率 10 MHz
带宽 120 MHz
脉冲到达时间 24 μs

下载: 导出CSV

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