星间星内无线通信技术分析-analysis of inter-satellite intra-satellite wireless communication technology.docx

针对卫星编队过程中的执行任务期间卫星距离近、通信数据量大，而非任 务期间距离远、通信数据量小的特点，再根据通信链路方程，在发射功率及信 噪比不变的条件下，可实现通信速率损耗和通信距离损耗之间的交换，提出了 星间变速率通信方法。针对变速率通信中射频信号检测、同步的难题，提出了 视频信号积累检测方法，利用通用的射频信道解决了变速率的通信问题，简化 了系统设计。变速率通信方法通过试验三 号卫星进行了在轨验证，实现了 400bps 到 250kbps 的变速率通信试验验证。关键词：星内通信；星间通信；无线通信协议；变速率通信AbstractOperationally responsive space technology was an important development direction of space technology. Inter-satellite/ intra-satellite communication system is an important part of the operationally responsive space satellite platform. The wired way of point-to-point or bus was usually used in traditional intra-satellite communication commonly. But this way was not able to realize plug-and-play proach, and was not suited to the rapid integration and quick testing to realize the rapid responsive. In this paper, intra-satellite communication system based on the wireless network was put forward. For the special property of intra-satellite communication system, the system structure, electromagnetic compatibility and the software protocol were researched in this paper. For inter-satellite communication and the formation flying, variable rate communication was proposed, and was simulated and experimented.Firstly, intra-satellite communication system architecture based on the wireless network was put forward. For requirements of single machine/components, the architecture concluded wireless communication unit and special module unit. The information exchange between special module units was realized through wireless communication unit. In order to improve the intra-satellite communication system architecture, multipath, occlusion and so on, main performance and technical index with different communication system were deeply studied. FSK/GFSK modulation and demodulation technique was taken. The theoretical model of wireless communication unit was established. SOC and RFIC were as core component to compose the wireless communication basic unit. The rationality and feasibility of intra-satellite communication sys