研究了采用带通采样的方法，实现HF雷达噪声频谱在线监测的原理，以及频谱监测的波形设计和系统实现。
In this paper, an online inspecting scheme of noise is introduced by employing the band sampling method, and the design of wave shape and the implementation of HF radar system are presented.
带通滤波电路是本系统消除噪声的关键部分，论文深入分析了带通滤波器的传输函数和幅频特性。
The transmission function and the amplitude-frequency characteristic of the filter is deeply analyzed. This filter guarantees the system precision as the components of the BPF were picked with choice.
带通滤波电路是本系统消除噪声的关键部分，论文深入分析了带通滤波器的传输函数和幅频特性。
The transmission function and the amplitude-frequency characteristic of the filter is deeply analyzed. This filter guarantees the system precision as the components of the BPF were picked with choice.
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