| 引用本文: | 李大伟,刘成,郑建华,等.适用于探空火箭的图像采集与压缩系统.[J].国防科技大学学报,2017,39(2):71-77.[点击复制] |
| LI Dawei,LIU Cheng,ZHENG Jianhua,et al.Image capture and compression system for sounding rocket[J].Journal of National University of Defense Technology,2017,39(2):71-77[点击复制] |
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| 本文已被：浏览 8498次 下载 6237次 |
| 适用于探空火箭的图像采集与压缩系统 |
| 李大伟1,2, 刘成1, 郑建华1, 刘一腾1 |
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(1. 中国科学院 国家空间科学中心， 北京 100190;2. 中国科学院大学， 北京 100190)
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| 摘要: |
| 针对探空火箭遥测带宽低、图像监控通路多、系统小型化等设计难点，提出一种基于ADV212的图像采集与压缩系统设计方案。采用可以同时支持无损和高压缩比有损压缩的JPEG2000图像压缩标准，提出适用于箭上图像采集特点的通道切换和中断处理策略，并以“乒乓”操作的流水线作业方式实现多路图像通道数据吞吐，通过两个实时发送通道和一个缓存发送通道向火箭遥测链路发送图像数据。提出一种具有动态帧频和压缩比的图像压缩方案，解决了探空火箭遥测带宽有限这一问题。本设计以Virtex-4系列现场可编程门阵列作为系统控制核心，采用ADV7182和ADV212分别完成图像的采集和压缩，分别采用静态随机存取存储器和同步动态随机存储器实现图像的实时传输和缓存传输。通过比较图像间的峰值信噪比值，试验并分析了适用于电荷耦合元件图像的压缩滤波器和小波变换级数，得到了较为满意的图像质量。设计较好地满足了本次空间环境垂直探测探空火箭的图像采集任务。 |
| 关键词: ADV212 JPEG2000 探空火箭 图像压缩 “乒乓”操作 通道切换 |
| DOI：10.11887/j.cn.201702010 |
| 投稿日期：2015-10-09 |
| 基金项目:国家“863”高科技资助项目(2015AA7033045) |
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| Image capture and compression system for sounding rocket |
| LI Dawei1,2, LIU Cheng1, ZHENG Jianhua1, LIU Yiteng1 |
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(1. National Space Science Center, Chinese Academy of Sciences, Beijing 100190, China;2.
2. University of Chinese Academy of Sciences, Beijing 100190, China)
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| Abstract: |
| The image system design for sounding rockets faced many difficulties, such as the limited telemetry bandwidth, multiple camera channels and a limited size, therefore an appropriate image capture and compression system based on ADV212 was proposed. The images were compressed as JPEG2000 standard which support both lossless and high ratio compression, so acceptable quality images can be transmitted through the limited-bandwidth telemetry channel. An effective channel switching and interrupt processing method suitable for on-board design was proposed. The image data was transmitted by assembly line based on ping pong operation and sent to the telemetry module on sounding rocket via two real-time channels and one buffering channel. The images compression scheme, which support both dynamic frame frequency and dynamic compression ratio, was proposed to deal with the limited telemetry bandwidth. The whole system was controlled by a Virtex-4 FPGA(field programmable gate array), and images were decoded by ADV7182 and compressed by ADV212. The real time data transfer was approached by SRAM(static random access memory), while the buffering data transfer was approached by SDRAM(synchronous dynamic random access memory). The suitable choices of compression filter and wavelet transformation level for CCD(change-coupled device) images were analyzed through experiments by comparing PSNR(peak signal to noise ratio) between images. This image compression system fully satisfies the image monitor mission of space environment vertical exploration sounding rocket. |
| Keywords: ADV212 JPEG2000 sounding rocket image compression ping pong operation channel switch |
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