摘要
光学联合变换器(JTC)是实现空间相机推扫成像时像移实时测量的有效技术手段。JTC-CDMA是一种改进的光学联合变换相关器。它通过码分多址技术能够有效降低整个JTC系统的空间带宽积,并实现自相关峰和互相关峰影像的分离,有利于系统的小型化。对JTC-CDMA的基本工作原理进行了分析,并讨论了该技术用于像移测量时所存在的问题。针对这些问题,提出了新的像移测量方法。通过计算机仿真实验对新方法的可行性进行了评估,结果表明:在沿航和穿航两个方向的像移测量RMS误差均低于0.1个像元,完全能够满足空间相机对像移测量低于0.2个像元的要求。
The optical joint transform correlator （JTC） is an effective technical means of image motion measurement of the pushbroom space camera. JTC-CDMA is an improved optical joint transform correlator which can reduce the space-bandwidth product and separate the autocorrelation peak and cross correlation peak effectively, and is helpful to miniaturization. The basic principles of JTC-CDMA were analyzed and the problems in image motion measurement by JTC-CDMA were discussed. Aiming at these problems, a new method was proposed. The feasibility of this method was evaluated and analyzed by computer simulation. The simulation results show that the RMS error of image motion measurement can be controlled below 0.1 pixels in two directions, which could meet the requirement of the space camera.
出处
《红外与激光工程》
EI
CSCD
北大核心
2012年第6期1635-1640,共6页
Infrared and Laser Engineering
基金
国家973计划(2009CB724006)
