空间太阳望远镜中1-bit图像相关器的实现

Implementation of 1-bit Image Correlator on the Space Solar Telescope

两维图像相关跟踪是空间太阳望远镜(SST)主光学望远镜系统达到0.1″分辨率的关键之一。本文提出了采用1-bit相关算法来实现图像快速相关运算,并设计出了基于FPGA+DSP架构的相关器硬件结构。25MHz下32×32点图像相关运算在XCV800芯片上实现仅需0.33ms,而硬件规模仅为基于FFT相关器(12-bit数据)的1/9。

2-D image correlation tracking is a key factor for the Main Optical Telescope （MOT） on the Space Solar Telescope （SST） to reach its 0. 1 ＂spatial resolution. In order to realize fast image correlation, 1-bit correlation arithmetic is proposed, and the hardware design of 1-bit correlator based on DSP and FPGA is given. Only 0.33ms is needed to realize a 32 × 32 image correlation algorithm on XCV800 FPGA chip with 20MHz clock. The FPGA resource consumption is only 1/9 that of FFF - based （ 12-bit data） correlator.