Analysis on the One-Way Communication Capability of GPS Satellites in Orbit Transmitting Non-navigational Information

Cheng Xi-jun, Xu Jiang-ning, Cao Ke-jin, Zhu Ying-bin
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引用次数: 1

Abstract

The GPS system is capable of the one-way communication (OWC) transmitting non-navigational information if the reserved bits of L1C Nav message and the newly-added CNav message types for L2C signal are utilized. Excluding the potential communication protocol overheads, a single frequency with one satellite transmits data at 0.5B/s; with the dual frequency transmission by using L1C and L2C frequencies and the parallel transmission of multiple satellites, the transmission rate can be increased to approximately 4B/s. The one-way communication of GPS is covert due to the covertness of communication channels, the occasionality of one-way communication, the disorderly distribution of information and the difficulty in recognizing and understanding communication data when the communication protocol is unknown. This paper discusses the problems of satellite rise-and-fall, data packetization and data dropout and gives solutions for them. A design paradigm for the format of newly-added L2C CNav message types is given. The GPS one-way communication has the advantages of global coverage, day-and-night and all-weather operation, as well as low cost, thus it can meet the needs for special purposes, such as civilian emergency broadcast communication, military submarine command system and command of intelligence collection.
非导航信息在轨GPS卫星单向通信能力分析
利用L1C导航电文的保留位和L2C信号新增的CNav电文类型,GPS系统可以实现单向通信(OWC)传输非导航信息。排除潜在的通信协议开销,单频与一颗卫星以0.5B/s的速度传输数据;采用L1C和L2C频率双频传输,多颗卫星并行传输,传输速率可提高到约4B/s。由于通信信道的隐蔽性、单向通信的偶然性、信息的无序分布以及通信协议未知时通信数据的识别和理解困难,GPS的单向通信具有隐蔽性。本文讨论了卫星上升和下降、数据分组和数据丢失等问题,并给出了解决方案。给出了新增L2C CNav消息类型格式的设计范例。GPS单向通信具有全球覆盖、昼夜、全天候运行、成本低等优点,可以满足民用应急广播通信、军用潜艇指挥系统、情报采集指挥等特殊用途的需要。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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