一句话：提出 Earth+，利用星座内历史参考图像仅下传变化区域，将在轨卫星图像下传用量降低 3.3 倍。
由于卫星到地面的下行链路容量有限，超过 90% 的对地观测图像无法传回地面。Earth+ 是一种新的在轨卫星图像压缩系统：它把同一位置的最新在轨参考图像作为基准，只识别并下传每幅图像中发生变化的区域。其关键设计是由地面站上传星座内所有卫星近期拍摄的图像，从而为在轨压缩提供最新参考图像。据作者所知，Earth+ 首次利用整个卫星星座的图像来提升图像下传效率。评估表明，在下载同一区域图像时，Earth+ 相比当前最先进在轨图像压缩技术可减少 3.3 倍下行链路用量，且不牺牲图像质量，也不增加下行、计算或存储资源。
Due to limited downlink (satellite-to-ground) capacity, over 90% of the images captured by the earth-observation satellites are not downloaded to the ground. To overcome the downlink limitation, we present Earth+, a new on-board satellite imagery compression system that identifies and downloads only changed areas in each image compared to latest on-board reference images of the same location. The key of Earth+ is that it obtains latest on-board reference images by letting the ground stations upload images recently captured by all satellites in the constellation. To our best knowledge, Earth+ is the first system that leverages images across an entire satellite constellation to enable more images to be downloaded to the ground (by better satellite imagery compression). Our evaluation shows that to download images of the same area, Earth+ can reduce the downlink usage by 3.3× compared to state-of-the-art on-board image compression techniques without sacrificing imagery quality or using more resources (downlink, computation or storage).
DOI 原文 · arXiv · PDF（开放获取） · DBLP
@inproceedings{DuCONJ25,
title = {Earth+: On-Board Satellite Imagery Compression Leveraging Historical Earth Observations},
author = {Kuntai Du and Yihua Cheng and Peder Olsen and Shadi Noghabi and Junchen Jiang},
booktitle = {ASPLOS},
year = {2025},
doi = {10.1145/3669940.3707222}
}