SARLink：利用合成孔径雷达的卫星反向散射连接
SARLink: Satellite Backscatter Connectivity using Synthetic Aperture Radar
AI总结：
SARLink提出利用现有SAR卫星与机械调制角反射器实现无源地面节点到低轨卫星的超远距离反向散射通信，并通过子孔径处理算法从原始SAR数据中提取比特，实验验证了其可行性。
摘要：
SARLink是一种无源卫星反向散射通信系统，利用现有的星载合成孔径雷达（SAR）成像卫星为偏远地区提供连接。与传统反向散射系统相比，它实现了数量级更远的通信距离，使无源地面节点与低地球轨道卫星之间能够进行通信。该系统由协作地面目标、SAR卫星和数据处理算法组成。设计了一种机械调制反射器，通过改变其雷达散射截面对环境SAR反向散射信号施加幅度调制。利用一种算法从原始SAR数据中提取这些通信比特，该算法利用子孔径处理在单个图像数据集中检测来自一个目标的多个比特。本文给出了使用开关键控的该通信系统的理论分析，包括预期信号模型、吞吐量和误码率。结果表明，一个5.5英尺×5.5英尺的调制角反射器可在每次卫星过境时发送60比特，足以支持低带宽传感器数据和消息。利用Sentinel-1A（一颗高度为693公里的SAR卫星），我们部署了静态反射器和调制反射器来评估该系统。实验结果成功检测到调制地面目标的状态变化，证明了我们的算法在提取比特方面的有效性，为超远距离、低功耗卫星反向散射通信铺平了道路。
英文摘要：
SARLink is a passive satellite backscatter communication system that uses existing spaceborne synthetic aperture radar (SAR) imaging satellites to provide connectivity in remote regions. It achieves orders of magnitude more range than traditional backscatter systems, enabling communication between a passive ground node and a satellite in low earth orbit. The system is composed of a cooperative ground target, a SAR satellite, and a data processing algorithm. A mechanically modulating reflector was designed to apply amplitude modulation to ambient SAR backscatter signals by changing its radar cross section. These communication bits are extracted from the raw SAR data using an algorithm that leverages subaperture processing to detect multiple bits from a target in a single image dataset. A theoretical analysis of this communication system using on-off keying is presented, including the expected signal model, throughput, and bit error rate. The results suggest a 5.5 ft by 5.5 ft modulating corner reflector could send 60 bits every satellite pass, enough to support low bandwidth sensor data and messages. Using Sentinel-1A, a SAR satellite at an altitude of 693~km, we deployed static and modulating reflectors to evaluate the system. The results, successfully detecting the changing state of a modulating ground target, demonstrate our algorithm's effectiveness for extracting bits, paving the way for ultra-long-range, low-power satellite backscatter communication.
机构、总结、中文摘要均由AI分析而来，可能存在错误，请以论文正文为准。
