基于复合式随机码雷达系统实现入侵监测

Intrusion Monitoring Based on Hybrid Random Code Radar System

面向安防区域的入侵监测过程包括区域边界的入侵报警和区域内部的入侵跟踪。然而,现有的入侵探测雷达技术难以兼顾区域边界和内部的同时监测,并且存在多入侵探测距离分辨率低和抗干扰能力弱的缺陷。提出并实验验证了一种面向入侵监测的复合式随机码雷达系统。该雷达系统结合了基于泄漏电缆的导波雷达和基于喇叭天线的一发多收雷达。前者用于实现区域边界的入侵报警,后者继而负责区域内部的入侵跟踪,最终实现监测区域的全面覆盖并消除监测盲区。此外,该雷达系统采用高速、正交的随机码信号作为上述两种雷达的发射信号。实验结果表明所提出的雷达系统不仅可以实现多个入侵者的同时报警和跟踪,而且具有强抗干扰能力。受益于随机码信号的高速率和自相关特性,导波雷达和一发多收雷达可以分别实现30 cm和15 cm的高距离分辨率,且抗干扰容限可以达到33.5 d B。

The intrusion monitoring process for security area includes intrusion alarm at the area boundary and intrusion tracking inside the area.The existing intrusion detection radar technologies are difficult to achieve simultaneous monitoring of area boundary and interi-or,and have the defects of low range resolution for multiple intrusion detection and weak anti-jamming ability.A hybrid random code ra-dar system for intrusion monitoring is proposed and demonstrated experimentally,which combines the guided radar based on leaky coaxi-al cables and the single-transmitter multiply-receivers(STMR)radar based on horn antennas.The former is used to realize the intrusion alarm at the area boundary,and the latter is responsible for the intrusion tracking inside the area,so as to finally realize the comprehen-sive coverage for the monitoring area and eliminate the monitoring blind area.In addition,this radar system uses high-speed and orthog-onal random code signals as the transmitting signals of the above two radars.The experimental results show that the proposed radar sys-tem can not only realize alarm and tracking for multiple intruders,but also have strong anti-jamming ability.Benefiting from the high speed and auto-correlation characteristics of the random code signal,the guided radar and the STMR radar can achieve the high range resolution of 30 cm and 15 cm respectively,and the anti-jamming tolerance can reach 33.5 dB.