基于FPGA的空间太阳望远镜图像相关算法实现

FPGA Implementation of SST Image Correlation Algorithm

两维图像相关跟踪是空间太阳望远镜1m光学系统达到0·1″分辨率关键之一.介绍了基于FPGA实现SST相关算法的方法,如2×2矢量基蝶形FFT、模块化结构、两级状态机、动态块浮点、并行流水时序等.20MHz下32×32图像相关算法在XCV800芯片上实现仅713微秒,像元拟合精度优于1/50.

2-D image correlation tracking is a key factor for the lm optical system on SST （ Space Solar Telescope） to reach its 0.1＂spatial resolution. The image correlation algorithm＇s FPGA implementation methods are introduced：2 × 2 radix butterfly-algorithm, modular structure, two levels infinite state machine, dynamic block float-point, and parallel processing sequence. Only 713us is needed to realize a 32×32 image correlation algorithm on XCV800 FPGA chip with 20MHz clock. Tracking precision is better than 1/50 pixel.