遥测,跟踪和命令链路性能使用USB/STDN波形

J. Kreng, M. Sue, S.K. Do, Y. Krikorian, S. Raghavan
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引用次数: 10

摘要

USB/STDN波形(统一s波段/航天跟踪和数据网络)已被用于为许多卫星提供遥测、跟踪和指挥(TT&C)服务,此外还有NASA近地轨道任务。跟踪和命令信号用于前向链路,或上行链路(地球到空间),而航天器跟踪和遥测信号用于返回链路,或下行链路(空间到地球)。上行链路带有方波PRN测距(伪随机噪声)或音调测距信号,用于改善载波采集和测距性能。通常下行信号是经过重滤波的信号,需要抑制方波的侧瓣或谐波,以满足NTIA(国家电信和信息管理局,美国商务部的一部分)发射频谱要求。这种过滤后的下行信号,有时被称为“正弦波”,有意减少地面站接收器的相邻信道干扰(ACI)。在这些空间链路中,对影响测控链路性能的调制损耗进行分析是非常重要的。目前可用的分析假设一个未经过滤的转发链路信号(上行链路或地对空链路)和一个经过严格过滤的返回链路(下行链路或地对地链路)。本文分别对USB/ STDN信号的前向链路(FWD)和返回链路(RTN)进行了频谱滤波和不滤波的调制损耗的推导。作为使用导出的调制损耗表达式的示例,本文给出了USB链路的四组链路分析:未滤波的FWD/未滤波的RTN,未滤波的FWD/滤波的RTN,滤波的FWD/未滤波的RTN,滤波的FWD/未滤波的RTN,以及滤波的FWD/滤波的RTN链路。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Telemetry, Tracking, and Command Link Performance Using the USB/STDN Waveform
The USB/STDN waveform (unified S-band/spaceflight tracking and data network) has been used to provide telemetry, tracking, and command (TT&C) services for many satellites in addition to NASA near-earth orbital missions. The tracking and command signals are used in the forward link, or the uplink (earth-to-space), while the spacecraft tracking and telemetry signals are used in the return link, or the downlink (space-to-earth). An uplink with a square-wave PRN ranging (pseudorandom noise) or tone-ranging signal is used to improve the carrier acquisition, and ranging performance. Typically the downlink signal is a heavily filtered signal that is needed to reject the side lobes or harmonics of the square waves to satisfy the NTIA (national telecommunications and information administration, a part of US department of commerce) emission spectrum requirements. This filtered downlink signal, sometimes called "sine-wave," intentionally reduces adjacent channel interference (ACI) at earth station receivers. In these space links, it is very important to analyze the modulation losses that affect the TT&C link performance. Currently available analyses assume an unfiltered forward link signal (uplink or earth-to-space link), and a heavily filtered return link (downlink or space-to-earth link). In this paper the modulation losses applicable to the USB/ STDN signal with and without spectral filtering are derived for both the forward link (FWD) and the return link (RTN). As examples of the use of the derived modulation loss expressions, four sets of link analyses for the USB link are given in this paper: unfiltered FWD/unfiltered RTN, unfiltered FWD/filtered RTN, filtered FWD/unfiltered RTN, and filtered FWD/ filtered RTN links.
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