基于现场可编程门阵列的联合变换相关器稳像系统研究

Research of Joint Transform Correlator Stablization Image System Based on Field Programmable Gate Array

空间推扫式时间延迟积分电荷耦合器件（TDI-CCD）相机在曝光时间内，容易因为相机焦平面与观测目标的偏移而造成图像模糊。为了获得高质量的图像数据,需要对成像系统进行稳像,而稳像的关键技术在于抑制成像平台的震动以及实时地、高精度地获取载体的运动轨迹。高速而精确地获取成像过程中载体平台的运动矢量,已经成为高分辨率成像的重点发展方向。通常获取运动矢量的方法速度较慢,无法满足实时地、准确地获取目标运动轨迹的需求，在联合变换光学相关器的图像位移矢量探测技术研究的基础之上，设计了基于现场可编程门阵列（FPGA）的联合变换相关器系统，代替基于傅里叶光学变换的联合变换相关器系统，计算精度达到了0.1 pixel。

Sensor images are easily blurred by the offset of camera focal plane and the observing targets during push-broom space camera exposure time .In order to obtain higher quality images, this camera system needs image stabilization operation. However, the key is restraining imaging platform vibration and getting precisely trajectory of platform in real-time.The acquisition of platform motion vector in high-speed and accurately in the imaging process has become the focus of the development direction of high resolution imaging. Methods often used to obtain targets motion vector are too slow to get targets trajectory accurately in-real time. A joint transform correlator based on field programmable gate array （FPGA） instead of the one based on Fourier optical transform is designed and the calculation precision is up to 0.1 pixel.