The Characteristics of Sea-clutter and Interferences in Various Domains and the Detection of Sea-clutter for Over-The-Horizon Radar
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摘要: 针对超视距(OTH)雷达接收信号成分复杂的问题，该文提出基于多域组图的信号分析方法，讨论海杂波、瞬态干扰和射频干扰的多域特征。运用时域、频域、距离域、重复周期和多普勒5域，组合为6种2维矩阵图，提出雷达接收数据的“五域六图”(5D6M)方法。通过五域六图，各种接收信号成分在多个域得以分离，海杂波和干扰在不同域的特征得以体现，清晰展示海杂波的频谱和多普勒谱特性、瞬态干扰的大功率和短时性以及射频干扰的窄带与多普勒特性。基于五域六图的信号特性分析，能够为雷达信号分析与处理提供很好的帮助。该文以海杂波为例，设计了基于频域-多普勒域的海杂波多普勒单元检测的新方法。Abstract: Considering that the receiving data of Over-The-Horizon (OTH) radar is complicated, a signal analysis method based on various domains and maps is proposed, and the characteristics of sea-clutter, transient interference and radio frequency interference are discussed in this paper. By employing the time, the frequency, the range, the period and the Doppler domains, six kinds of two dimensional matrices or maps are constructed, which forms the Five-Domain-Six-Map (5D6M) concept for the radar receiving data. By using the 5D6M, the signal components of the receiving data and reveal their characteristics can be separated in various domains, including the spectrum and Doppler property of sea-clutter, the power and transient features of transient interference, and the narrowband and Doppler property of radio frequency interference. The characteristic analysis based on the 5D6M can help the radar signal analysis and processing. By taking the sea-clutter as an example, a novel method for detecting the sea-clutter Doppler based on the frequency-Doppler map is proposed.
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Key words:
- Over-The-Horizon (OTH) radar /
- Sea-clutter /
- Interference /
- Characteristic analysis
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表 1 五域名称与含义
五域 含义 英文简写 时域 一个雷达重复周期内接收数据的采样点即快时间维 T(Time) 频域 快时间维时域数据的快速傅里叶变换所对应频域 F(Frequency) 距离域 时域数据在脉冲压缩处理后，获得距离域分辨力 R(Range) 重复周期 雷达发射信号的重复周期序号，相当于慢时间维 P(Period) 多普勒维 慢时间维的快速傅里叶变换，对应频域为多普勒维 D(Doppler) 
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表 2 六图名称与含义
六图 时域(T) 频域(F) 距离域(R) 重复周期(P) TP图将接收数据按照周期排列
所得2维矩阵FP图对TP图的快时间维进行FFT得到 RP图将接收数据脉冲压缩后按照周期
排列得到多普勒维(D) TD图对TP图慢时间维进行
加窗和FFT得到FD图对FP图慢时间维进行加窗和FFT得到 RD图对RP图慢时间维进行加窗和
FFT得到
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