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A novel model of spin aircraft 3D SAR imaging and height measurement
Received date: 2014-06-03
Revised date: 2014-08-15
Online published: 2014-08-26
Due to the complexity of movement, spin aircraft is never regarded as a general platform for SAR imaging and its accurately measured height is not easy to obtain. In this paper, through studying a new 3D SAR imaging model of spin aircraft, the height measurement is combined with 3D SAR imaging. A height measurement model based on 3D SAR imaging is proposed. Firstly, through the analysis of antenna phase center's trajectory, the half spiral trajectory is equal to the antenna array. Then, based on the equivalent plane array and the fuzzy function theory, a novel spin aircraft 3D SAR imaging model is put forward, the feasibility of 3D imaging is theoretically proved and imaging performance of the model is analyzed. Based on this imaging model, this paper proposes a height measurement model based on 3D SAR imaging and the factors that affect measuring precision are analyzed. According to the characteristics of the equivalent plane array non-uniform distribution, back projection (BP) algorithm is used to verify the feasibility of the 3D imaging model under the spin aircraft and the effectiveness of the height measurement model.
Key words： spin aircraft; antenna array; SAR imaging; imaging processing; height measurement
CHEN Siyuan , ZHANG Xiaoling , SHI Jun , ZHANG Hai . A novel model of spin aircraft 3D SAR imaging and height measurement[J]. ACTA AERONAUTICAET ASTRONAUTICA SINICA, 2015 , 36(4) : 1240 -1249 . DOI: 10.7527/S1000-6893.2014.0189
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