運動目標分布式雷達成像技術(shù)研究
[Abstract]:In this paper, the distributed radar imaging of non-cooperative moving targets is taken as the object. Based on the spatial spectrum theory, the spatial expansion characteristics of the distributed system, the bandwidth of the transmitted signal, the effect of the relative motion of the target on the imaging and their mutual relations are considered synthetically. The research of distributed radar imaging technology with bistatic inverse synthetic aperture radar (Bistatic Inverse Synthetic Aperture Radar, B-ISAR) as the basic system is emphasized. The main work is as follows: first of all, Aiming at the special geometric configuration of B-ISAR, the basic unit of distributed radar imaging, an echo modeling method based on motion decomposition is proposed. The echo model can represent the geometric distortion of B-ISAR imaging results analytically. The relation between the two-dimensional calibration factor and the system configuration and the target motion, so the distortion correction and calibration problem of the imaging is transformed into the parameter estimation problem. On this basis, the imaging plane of B-ISAR is derived under general conditions, and the geometric distortion and calibration characteristics of range Doppler (Range-Doppler, RD) imaging results are analyzed, which lays a foundation for the study of the following chapters. Secondly, using the sparse prior information of target scattering, the application of compression sensing in distributed imaging of moving target is studied. There are two aspects: 1) the problem of geometric distortion in RD imaging of B-ISAR and the problem that two-dimensional image can not be directly calibrated. A B-ISAR sparse imaging algorithm combining geometric distortion correction and calibration is proposed. A sparse fusion imaging method for moving objects based on T/R-R (transmitter/receiver-receiver) configuration is proposed. The high resolution sparse imaging of moving targets is realized in a short coherent processing time with a simple system configuration. Thirdly, a new distributed imaging configuration, multiple input single output (ISAR (Multiple Input Single Output ISAR, MISO-ISAR), is proposed to solve the problem of high resolution imaging of moving targets, which simplifies the system complexity as much as possible while obtaining high resolution. It improves the anti-jamming ability, maneuverability and survivability of the system, and embodies a good compromise between high performance and practicability. Finally, on the basis of MISO-ISAR, a 3D imaging method based on motion receiver is proposed. This method uses one-dimensional transmitter array and moving receiver to realize 3D imaging of moving object. The system structure is simple and practical.
【學(xué)位授予單位】:中國科學(xué)技術(shù)大學(xué)
【學(xué)位級別】:博士
【學(xué)位授予年份】:2014
【分類號】:TN957.52
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