基于外辐射源的高频天波雷达信号分析与选择

HF sky-wave radar signal analysis and selection based on the passive illuminator

结合外辐射源雷达和天波超视距雷达的体制特点,对短波段可作为辐射源的几种通信信号形式进行了分析,通过仿真和试验验证,给出了外辐射源信号选用依据。首先对短波通信中常用的调幅(AM)、调频(FM)、频移键控(FSK)以及正交频分复用(OFDM)等信号形式进行了仿真分析,给出了信号频谱及模糊函数。试验中根据各信号形式产生相应调制波形,并依靠试验平台进行发射和接收,录取实测数据进行分析。信号分析与评估采用经典线性调频信号为参照信号,探测能力以信噪比和杂噪比为评估依据,根据实测数据给出了各信号形式的评估结果和选用依据。

Based on the research status of passive radar and sky-wave over-the-horizon radar system, analysis of some SW communication signals that can be used as external illuminator is proposed, and the selection basis is given through theoretical simulation and experiment. Firstly, this article simulates four commonly used external illuminators： AM, FM, FSK and OFDM signal, and gives their spectrum and ambiguity function. Based on the experimental platform, the four corresponding modulation waveforms are transmitted and received, and the received data is recorded. Signal analysis and assessment use LEM signal as the reference signal, the detection ability use SNR and clutter-noise-ratio as evaiuatina basis, and this paper gives evaluating result and selection basis in the end.