基于4G基站信号的被动雷达相关技术研究

发布时间：2018-09-09 13:26

【摘要】：随着现代科学技术的发展,传统体制雷达越来越受到电子干扰、隐身技术、反辐射导弹、超低空突防等四大威胁。被动雷达由于不需要自身发射信号,而是利用第三方外辐射源信号,因此具有对抗四大威胁的良好特性。近年来,被动雷达受到越来越多的关注。移动通信信号具有广覆盖、方便组网等优点,是一种优良的外辐射源信号,因此受到被动雷达研究者的重视。本文研究基于4G基站信号的被动雷达系统,完成的主要研究工作如下:1、深入分析4G移动通信系统的技术特点,根据雷达探测理论,分析了LTE信号的距离和多普勒分辨率;详细分析了LTE信号的模糊函数,并具体解释了产生旁瓣的原因;通过和其他常见外辐射源信号的对比,验证了LTE信号具有良好的特性;利用双基地雷达方程计算了4G基站信号被动雷达的理论威力范围,完成了对基于4G基站信号的被动雷达的可行性分析。2、针对目标回波信号中含有强大的直达波和多径等杂波问题,研究了直达波和多径杂波对消技术。分析比较了LMS算法、NLMS算法、ECA算法和RLS算法这四种算法在4G基站信号被动雷达系统中杂波抑制性能。综合考虑杂波抑制比和权值收敛速度等指标,采用了基于RLS算法的自适应杂波对消算法,并通过仿真实验,验证了RLS算法的有效性。3、针对多目标检测过程中传统雷达目标方法无法检测出弱目标信号的问题,研究了基于压缩感知理论的4G基站信号被动雷达系统目标检测方法。将压缩感知理论的稀疏重构思想应用到被动雷达目标检测中,并在多个目标环境的仿真实验中,检测出强弱目标,验证了本文所采用方法的有效性,为被动雷达目标检测提供了另一种性能较好的算法。
[Abstract]:With the development of modern science and technology, the traditional radar is more and more threatened by electronic jamming, stealth technology, anti-radiation missile and ultra-low altitude penetration. Passive radar does not need to transmit signal itself, but uses the signal of external emitter of third party, so it has the good characteristic of countering the four major threats. In recent years, passive radar has attracted more and more attention. Mobile communication signal has the advantages of wide coverage, convenient networking and so on. It is an excellent external emitter signal, so it has been paid attention to by passive radar researchers. In this paper, the passive radar system based on 4G base station signal is studied. The main research work is as follows: 1. The technical characteristics of 4G mobile communication system are deeply analyzed. According to the radar detection theory, the range and Doppler resolution of LTE signal are analyzed. The ambiguity function of LTE signal is analyzed in detail, and the reason of producing sidelobe is explained concretely, and the comparison of LTE signal with other common external emitter signals proves that LTE signal has good characteristics. The theoretical power range of 4G base station signal passive radar is calculated by using bistatic radar equation. The feasibility analysis of passive radar based on 4G base station signal is completed. Aiming at the problem that the target echo signal contains powerful direct wave and multipath clutter, the technology of direct wave and multipath clutter cancellation is studied. This paper analyzes and compares the clutter suppression performance of LMS algorithm and RLS algorithm in 4G base station signal passive radar system. Considering the index of clutter suppression ratio and weight convergence rate, the adaptive clutter cancellation algorithm based on RLS algorithm is adopted, and the simulation experiment is carried out. The effectiveness of RLS algorithm is verified. Aiming at the problem that traditional radar target method can not detect weak target signal in the process of multi-target detection, the passive radar system target detection method of 4G base station signal based on compression sensing theory is studied. The sparse reconstruction of compressed sensing theory is applied to passive radar target detection, and the strong and weak targets are detected in the simulation experiments in many target environments. The effectiveness of the proposed method is verified. It provides another algorithm with good performance for passive radar target detection.
【学位授予单位】：电子科技大学
【学位级别】：硕士
【学位授予年份】：2016
【分类号】：TN929.5;TN95

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