Target Detection in the Interrupted-Sampling Repeater Jamming Background Based on Multi-subband Matching Filter Method
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摘要: 间歇采样转发干扰(ISRJ)是一种基于欠采样原理的新型雷达干扰技术，此类干扰信号能够在雷达1维距离像(HRRP)上形成密集假目标，给目标检测带来一定挑战。针对雷达在间歇采样转发干扰背景下无法准确检测到目标的问题，一种基于多层子带匹配滤波的抗间歇采样转发干扰目标检测算法被提出。该方法首先以传统雷达匹配滤波函数为基础设计子带匹配滤波函数；随后，针对间歇采样转发干扰信号和目标回波信号的时间差异，构建子带匹配滤波信号模型，逐步分析并揭示了间歇采样转发干扰信号对子带匹配滤波函数时宽的敏感性；最后，基于此设计出基于多层子带匹配滤波的抗间歇采样转发干扰目标检测方法，并进行了仿真实验验证。实验结果表明：多层子带匹配滤波方法无需事先获得干扰的先验信息，可使雷达在受到间歇采样转发干扰且信干比大于–20 dB时，目标检测概率大于80%。Abstract: Interrupted-Sampling Repeater Jamming (ISRJ) is an advanced radar interference, which is based on the under-sampling theory. The kind of this interference may introduce a train of false targets into the High-Resolution Range Profile (HRRP), and create some challenges for the target detection. To solve this dilemma, a multi-subband matching filter method is proposed. Firstly, the subband matching filters is obtained by the traditional matching filter. Then, the signal models of the subband matching filters are established by the difference between the ISRJ and the target echo. As the ISRJ is sensitive to the time width of the subband matching filter, a multi-subband matching filter method is presented for the target detection in ISRJ back-ground. Simulation results indicate that the ISRJ can be suppressed by the multi-subband matching filter without the prior information about the ISRJ, and the detection probability of the radar target can be above 80% when the signal to interference ratio of the radar is above –20 dB.
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表 1 仿真参数设置
类型 项目 参数 项目 参数 雷达
参数雷达载频 10 GHz 带宽 500 MHz 脉冲重复频率 2 kHz 脉冲宽度 20 μs 雷达波形 LFM 采样频率 1.2 GHz 目标
参数目标雷达 点目标 运动状态 静止 目标位置 –2 m SNR –10 dB 虚警概率 10–4 干扰参数 直接转发 干扰位置 30 m 占空比 50% 重复转发 干扰位置 30 m 重复次数 3次 循环转发 干扰位置 30 m 循环顺序 倒序 蒙特卡罗
实验蒙特卡罗
次数1 000 SIR
采样时宽–45～–5 dB
1～3 μs
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表 2 仿真参数设置
类型 项目 参数 项目 参数 雷达
参数雷达载频 10 GHz 带宽 500 MHz 脉冲重复频率 2kHz 脉冲宽度 20 μs 雷达波形 LFM 采样频率 1.2 GHz 目标
参数目标雷达 点目标 运动状态 静止 目标位置 –2 m SNR –10 dB 虚警概率 10–4 干扰
参数间歇采样频率 100～300 kHz 占空比 20%～50% 干扰位置 3 m SIR –50～0 dB 蒙特卡罗次数 1 000次 SIR步进 1 dB
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