时频联合处理方法在地波高频雷达中的应用

一般采用时域或频域的方法对雷达信号进行分析。时频联合处理方法在时间-频率二维空间对信号的特性进行分析,从而进一步得到信号频谱分量在时间轴上的分布图。因此,对于具有时变频率分量的空中目标回波而言,时频联合处理方法是一种有效的分析方法。文中简要介绍了时频联合处理方法的基本方程,采用时频联合处理方法对具有多个频谱分量的混合信号、噪声加信号和高频雷达在强海杂波背景下的空中机动目标回波信号进行了分析和说明。结果表明,时频联合处理方法的应用能大大提高高频雷达对目标的探测能力。

The application of time-frequency combined processing in ground wave HF radars

Time domain or frequency domain is generally adopted to analyze radar signals.The time-frequency combined processing method analyzes the characteristics of the signals in time-frequency 2D space to further get the distribution plot of signal spectrum components on time axis.Therefore the time-frequency combined processing is effective for the air target echoes having time-varying frequency components.The basic equations of time-frequency combined processing are briefly introduced.The hybrid signals being with multiple spectrum components,the noise-plus signals,and the echo signals of air maneuvering targets detected by HF radars in strong sea clutters are analyzed.The result shows that the time-frequency combined processing can greatly improve the target detecting ability of HF radars.