高速双光谱遥感图像传输系统

High Speed Transmission System for Dual-Spectral Remote Sensing System

提出并设计了一种高速双光谱遥感图像传输系统。对该系统所采用的传输策略,传输帧结构以及时序恢复等问题进行了深入的研究。首先,将双探测器一行数据中有效部分提取后传输,采用行有效标志中断发送的方式在接收端恢复时序,保证了系统输入输出数据、时序的完全一致;接着,采用发送与接收缓存机制,利用时分复用方法将双探测器的数据在单根光纤介质中传输;然后,使用内嵌高速数据接口的大规模可编程逻辑器件分别实现了发送与接收分系统,最后搭建了系统测试与验证平台。结果表明该系统支持全配置的Camera Link接口探测器,单根光纤传输双异步探测器最高像素时钟达40 MHz,串行数据最高速率可达6.25 Gb.s-1。系统结构紧凑、可靠性高,非常适合航空、航天遥感设备。

In order to realize dual-spectral aerial camera image data transmission,a novel optical transmission system is proposed,then transmission scheme,structure of data frame and timing recovery method are discussed thoroughly.First,valid data in one line are picked up from two detectors before transmitting,a timing recovery method which makes in-out data timing and format consistent,is proposed using line valid interrupt flag.Second,based on transmitting and receiving buffering mechanism,dual asynchronous detectors data are transmitted in a single fiber.Third,transmitting and receiving systems are implemented using large programmable devices which embeds high speed data interface.Finally,behavioral and system verification method is proposed as well.Experimental results indicate that the system could support full,median and base cameral link protocol,serial data transmitting speed could be 6.25 Gb·s-1,and pixel data rate is 40 MHz at most for two detectors.It is very suitable for space and serial remote sensing equipment due to its compact and high reliable structure.