Modeling and Analysis of Sea-clutter Signal for Wide-band Radar Based on Electromagnetic Model
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摘要: 该文针对时变海洋面雷达回波信号模拟问题，建立了一种包含电磁散射机理与雷达波形调制特征的海杂波雷达回波信号模型。该模型首先建立一组具有时变特征的海面几何样本，通过对改进双尺度面元模型的加速处理，实现各时刻海面散射数据的高效模拟，并通过与测试数据的对比证实了电磁计算方法的准确性，然后采用子脉冲形式建立宽带回波信号模型，并以各面元散射数据代替其复幅度从而完成雷达回波信号建模。通过仿真验证了模型的合理性与高效性，对海杂波数据的统计分析展示了脉冲压缩处理对杂波的抑制效果。该海杂波模型既考虑了海洋的复杂散射机理与运动特性，又具有一般宽带信号的形式，因此可同时为海洋散射现象的解释和信号处理算法的分析提供完备数据源。Abstract: For the radar signals simulations of time-varying ocean surface, a radar signal model of sea clutter incorporating the electromagnetic scattering mechanism and radar signal modulation characteristics is developed. First, a set of time-varying sea surface geometric samples are constructed, and an efficient simulation of sea scattering at each time is performed by accelerating the calculation of the improved facet-based two-scale model, and the accuracy of the electromagnetic calculation method is demonstrated by comparing with the measured data. Then the band-wide echo signal model is established in the form of sub-pulse, and the scattering data of each surface element is replaced with its complex amplitude to complete the radar signal modeling. In simulations, the rationality and efficiency of the electromagnetic model are verified, and the statistical analysis of sea clutter data shows the effect of pulse compression on clutter suppression. This sea clutter model not only takes into account of the complex scattering mechanism and motion characteristics of the ocean, but also has the form of a general band-wide signal, so it can provide comprehensive source data for the interpretation of ocean scattering phenomena and the analysis of signal processing algorithms.
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Key words:
- Wide band radar /
- Electromagnetic scattering /
- Sea clutter /
- Facet-based two scale model
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表 1 仿真参数与计算时间
面元模型 粗糙面尺寸(m2) 面元尺寸(m) 计算时间(s) 传统双尺度 200×200 0.5 136 改进双尺度 200×200 2 134 本文模型 200×200 2 36 
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