| 引用本文: | 杨凤凤,梁甸农,刘建平.地球自转对分布式星载SAR-GMTI的影响.[J].国防科技大学学报,2006,28(1):90-93.[点击复制] |
| YANG Fengfeng,LIANG Diannong,LIU Jianping.The Earth Rotation Effects on Distributed Spaceborne SAR-GMTI[J].Journal of National University of Defense Technology,2006,28(1):90-93[点击复制] |
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| 地球自转对分布式星载SAR-GMTI的影响 |
| 杨凤凤, 梁甸农, 刘建平 |
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(国防科技大学 电子科学与工程学院，湖南 长沙 410073)
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| 摘要: |
| 地球自转对分布式星载SAR-GMTI的影响主要体现在两个方面：(1)受测绘带地形起伏和杂波抑制手段的制约，星间基线应平行于地面波束足迹方向，编队卫星轨道参数必须保持一定的关系；(2)地杂波多普勒与距离有关，必须采取适当措施以克服杂波凹口形变及展宽。在综合上述两个影响的基础上，设计了由3颗小卫星编队构成的分布式星载SAR-GMTI系统，并以信杂噪比损失为指标，衡量该系统在X和L两个波段下能够达到的理论性能上限。 |
| 关键词: 分布式星载SAR 动目标检测 地球自转 |
| DOI： |
| 投稿日期：2005-09-07 |
| 基金项目: |
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| The Earth Rotation Effects on Distributed Spaceborne SAR-GMTI |
| YANG Fengfeng, LIANG Diannong, LIU Jianping |
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(College of Electronic Science and Engineering, National Univ. of Defense Technology, Changsha 410073, China)
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| Abstract: |
| The earth rotation has two main effects on the distributed spaceborne SAR-GMTI. Firstly, the baseline must orient the same direction of radar's footprint on the rotating earth to mitigate the fluctuant terrain clutter and satisfy ATI, DPCA or STAP condition, which means that proper relationships must be maintained between satellites' orbit parameters. Secondly, Doppler is dependent on range, so yaw steering technique is required to mitigate the warping or extended clutter notch. Based on the two effects, a distributed spaceborne SAR system composed of 3 small satellites was designed to perform GMTI function. Performance simulation was made to scale the system capability through SCNR loss metric for both X and L bands. |
| Keywords: distributed spaceborne SAR GMTI the earth rotation |
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