DTMB外辐射源雷达参考信号纯度对探测性能的影响分析

Influence of reference signal purity on target detection performance in DTMB-based passive radar

外辐射源雷达通过被动接收目标反射的第三方照射源信号来实现目标探测,其中参考通道纯净参考信号获取与目标通道直达波抑制是实现目标相干检测的两项关键技术。研究了基于地面数字多媒体广播(digitalterrestrial multimedia broadcasting,DTMB)的外辐射源雷达中的参考信号重构技术,并结合时域直达波抑制和匹配滤波处理重点分析了重构参考信号纯度对目标探测性能的影响。仿真与实测数据处理结果表明,重构技术能够有效地获取参考信号,提高参考信号纯度,对改善外辐射源雷达的探测性能有积极的作用。

Passive radar achieves target detection by passively receiving the reflected third-party illuminato of opportunity. Therefore high quality reference signal acquisition in reference channel and direct wave suppres sion in target channel are both key technologies to realize the target correlation detection. This paper studies th reference signal reconstruction technology in digital terrestrial multimedia broadcasting （DTMB） based passiv radar, and discusses the influence of reference signal purity on target detecting performance combining tim domain direct wave suppression methods with matched filtering. Simulation and real data processing result demonstrate that the reference signal is well reconstructed. Improving the purity of reference signal is helpful t enhance the passive radar performance.