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机载多通道广角凝视SAR地面动目标指示技术研究

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机载广角凝视合成孔径雷达(WasSAR)是一种可对观测区域实施多角度长时间凝视成像探测的新兴SAR成像技术.将机载WasSAR成像与地面运动目标指示(GMTI)技术相结合,则可对重点区域内出现的地面运动目标实施持续成像跟踪监视,从而获取准确的动态感知信息.该文首先建立了机载多通道WasSAR动目标回波模型,分析了WasSAR动目标特性;然后,通过采用偏移相位校正和改进二维自适应校正方法,消除了载机姿态误差与通道非均衡的影响;在此基础上,提出了机载多通道WasSAR动目标检测跟踪算法,实现了复杂路况上行驶动目标的准确检测与跟踪;最后,提出了机载多通道WasSAR动目标行驶轨迹重构算法,实现了起伏路面下的动目标行驶轨迹精确重构.此外,该文中给出了作者团队利用自主研制机载多通道WasSAR-GMTI系统开展的外场飞行试验和实测数据处理结果,验证了地面运动目标持续跟踪监视的有效性和实用性,为后续开展更加深入的研究提供基础.
Research on the Technology of Airborne Multi-channel Wide Angle Staring SAR Ground Moving Target Indication
Airborne Wide angle staring Synthetic Aperture Radar(WasSAR)is a novel SAR imaging technique that enables multiangle and long-time staring imaging of an observation region.The combination of WasSAR and Ground Moving Target Indication(GMTI)facilitates the long-time tracking of moving targets in key areas,thereby obtaining dynamic sensing information.Herein,we initially constructed a moving target echo model for airborne multi-channel WasSAR,followed by an analysis of the characteristics of a moving target during WasSAR imaging.Further,group phase shift calibration and modified A2DC methods are proposed to mitigate the influence of platform attitude errors and channel imbalances.In accordance with this,an extended airborne multi-channel WasSAR ground moving target detection and tracking method is proposed,which achieves accurate detection and tracking of targets moving on complex roads.Finally,a trajectory reconstruction method for moving targets in airborne multi-channel WasSAR-GMTI is presented,demonstrating accurate trajectory reconstruction for targets on complex roads.Moreover,a flight experiment using our independently developed airborne multi-channel WasSAR-GMTI system,along with the associated real data processing results,is presented.These results confirm the validity and practicability of airborne WasSAR-GMTI for moving target dynamic surveillance and serve as a foundation for future research.

Wide angle staring SAR(WasSAR)Ground Moving Target Indication(GMTI)Error calibrationGround moving target detection and trackingTrajectory reconstruction

安道祥、葛蓓蓓、王武、陈乐平、冯东、周智敏

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国防科技大学电子科学学院 长沙 410073

复杂航空系统仿真重点实验室 北京 100076

中国空气动力研究与发展中心高速空气动力研究所 绵阳 621000

广角凝视SAR 地面运动目标指示 误差校正 动目标检测跟踪 行驶轨迹重构

湖南省自然科学杰出青年基金国家自然科学基金国家自然科学基金国家自然科学基金

2022JJ10062622714926210156262101566

2023

10.12000/JR23147

雷达学报
中国科学院电子学研究所 中国雷达行业协会

雷达学报

CSTPCDCSCD北大核心EI
影响因子：0.667
ISSN：2095-283X
年,卷(期)：2023.12(6)
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