红外与激光工程, 2019, 48 (4): 0406003, 网络出版: 2019-07-23   

基于光学相控阵的提高APD阵列三维成像分辨率方法

Method of improving 3D imaging resolution of APD array based on optical phased array
作者单位
1 航天工程大学 研究生院, 北京101416
2 航天工程大学 航天信息学院, 北京 101416
3 航天工程大学 电子与光学工程系, 北京 101416
4 63981部队, 湖北 武汉 430311
摘要
小面阵APD阵列较低的像元数量限制了其三维成像分辨率。提出了一种基于光学相控阵的提高APD阵列三维成像分辨率方法, 用光学相控阵生成与APD阵列像元数量相同且位置匹配的光束阵列并实现扫描。光束阵列中子光束发散角小于APD阵列中单个像元的瞬时视场角, 子光束在单个像元视场内扫描实现APD阵列对目标三维信息的多次采集, 进而提高APD阵列的分辨率。在Matlab中基于二维标量衍射理论仿真了光束阵列在远场的分布, 并分析了子光束发散角与扩展周期数之间的关系。最后采用液晶相位空间光调制器作为光学相控阵器件, 结合CCD接收回波信号, 进一步验证了提出方法的可行性。
Abstract
The small number of pixels in APD array is the limitation of three dimension imaging resolution. A method based on optical phased array was proposed to improve 3D imaging resolution of APD array, the optical phased array was used to generate and scan the beam array, the number and position of the beam array were matched with the APD array. The divergence angle of the sub-beam in the beam array was smaller than the instantaneous FOV of a single pixel in the APD array, the APD array acquired multiple acquisitions of the target 3D information by scanning the sub-beam in a single pixel to improve the resolution of the APD array. The distribution of the beam array in the far field was simulated based on the two-dimensional scalar diffraction theory in Matlab, and the relationship between the divergence angle of the beam and the number of extended cycles was analyzed. Finally, the liquid crystal phase spatial light modulator was used as the optical phased array device, and the CCD was used to receive the echo signal, which further verified the feasibility of the proposed method.

王帅, 孙华燕, 赵延仲, 曾海瑞, 刘田间. 基于光学相控阵的提高APD阵列三维成像分辨率方法[J]. 红外与激光工程, 2019, 48(4): 0406003. Wang Shuai, Sun Huayan, Zhao Yanzhong, Zeng Hairui, Liu Tianjian. Method of improving 3D imaging resolution of APD array based on optical phased array[J]. Infrared and Laser Engineering, 2019, 48(4): 0406003.

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