In order to receive omnidirectional low-SNR signal of whole HF band, we present an adaptive omni-direction & narrow-beam receiving antenna array.
为了实现对短波频段全空域低信噪比信号的良好接收，本文提出了一种窄波束全向接收的自适应天线阵。
In the highly crowded HF band, available continuous bandwidth is very narrow, this threaten the viability of HF radar based on the continuous spectra signal system seriously.
在拥挤的高频频段，可用的连续带宽比较窄，基于连续谱信号体制的高频雷达的生存能力受到严重威胁。
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.
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。
High frequency band is a hostile electromagnetic environment. In this band atmospheric noise emitted by lightning in a short distance may badly affect HF GW radar's normal function.
高频段电磁环境恶劣，近区雷电在这一频段激发的天电噪声对HF -GW雷达的正常工作构成了严重干扰。
High frequency band is a hostile electromagnetic environment. In this band atmospheric noise emitted by lightning in a short distance may badly affect HF GW radar's normal function.
高频段电磁环境恶劣，近区雷电在这一频段激发的天电噪声对HF -GW雷达的正常工作构成了严重干扰。
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