| 天基预警雷达低自由度STAP方法研究 |
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| 引用本文： | 段克清,李雨凡,杨兴家,邱梓洲,王永良.天基预警雷达低自由度STAP方法研究[J].雷达学报,2022,11(5):871-883. |
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| 作者姓名： | 段克清 李雨凡 杨兴家 邱梓洲 王永良 |
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| 作者单位： | 1.中山大学电子与通信工程学院 深圳 5181072.空军预警学院 武汉 430019 |
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| 基金项目： | 国家自然科学基金(61871397) |
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| 摘 要： | 受卫星高速运动和地球自转影响，天基预警雷达杂波在俯仰-方位-多普勒三维空间呈紧耦合特性，极大降低了传统空时自适应处理(STAP)方法的慢速运动目标检测性能。采用方位-俯仰-多普勒三维STAP可实现天基预警雷达杂波解耦，但与非正侧机载预警雷达杂波的三维松耦合情况不同，该应用需要较大系统自由度才能实现次最优杂波抑制性能，所带来的巨大运算负担和均匀样本需求使其难以应用于实际。针对上述问题，该文首先构建了天基预警雷达平面阵回波空时信号模型；然后详细分析了其杂波在方位-俯仰-多普勒三维空间的紧耦合特性；最后提出了基于级联处理的低自由度三维STAP方法，利用空域加权子阵合成预先衰减副瓣杂波，再利用俯仰-多普勒自适应处理抑制剩余各次距离模糊主瓣杂波。仿真实验验证了所提STAP方法可在低运算复杂度和小样本需求条件下实现次最优杂波抑制性能，因此适用于天基预警雷达实际应用。
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| 关 键 词： | 天基预警雷达 空时自适应处理 紧耦合杂波 低自由度 杂波抑制 最小可检测速度 |
| 收稿时间： | 2022-04-26 |
Reduced Degrees of Freedom in Space-Time Adaptive Processing for Space-based Early Warning Radar |
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| DUAN Keqing,LI Yufan,YANG Xingjia,QIU Zizhou,WANG Yongliang.Reduced Degrees of Freedom in Space-Time Adaptive Processing for Space-based Early Warning Radar[J].Journal of Radars,2022,11(5):871-883. |
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| Authors: | DUAN Keqing LI Yufan YANG Xingjia QIU Zizhou WANG Yongliang |
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| Affiliation: | 1.School of Electronic and Communication Engineering, Sun Yat-sen University, Shenzhen 518107, China2.Air Force Early Warning Academy, Wuhan 430019, China |
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| Abstract: | The clutter of space-based early warning radar exhibits tight coupling in the azimuth-elevation-Doppler domain due to the high speed of satellites and the Earth’s rotation. As a result, conventional Space-Time Adaptive Processing (STAP) suffers significant performance degradation when detecting slow moving targets. The azimuth-elevation-Doppler three-dimensional STAP method provides the ability to decouple clutter and thus can achieve sub-optimal performance for clutter suppression. However, in contrast to the situation in non-sidelooking airborne early warning radar, this method requires large system degrees of freedom when applied to space-based early warning radar. Therefore, in practice, both the computational load and the sample requirement are too large to meet. In this study, the space-time signal model of the planar array for space-based early warning radar is first constructed. Then, the tight coupling characteristic of clutter in the azimuth-elevation-Doppler domain is analyzed in detail. On this basis, a novel three-dimensional STAP method with reduced degrees of freedom with factored structure is proposed. The sidelobe clutter is first suppressed via amplitude taper in azimuth, and the mainlobe clutter responding to each ambiguous range is further canceled by adaptive processing in the elevation-Doppler domain. The simulation results show that the proposed method can achieve sub-optimal performance under low computational load and limited sample conditions. Therefore, the proposed method is suitable for practical application in space-based early warning radar. |
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