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首页> 外文期刊>Aerospace and Electronic Systems, IEEE Transactions on >Execute Command in Space Communications
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Execute Command in Space Communications

机译：在太空通信中执行命令

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Two types of feedback systems for a command channel are described. a) Complex Feedback¿where, for each command, an identification is relayed back over the feedback channel. b) Decision Feedback¿where the feedback channel is used only to state whether the satellite recognized the transmission as a command word. For a), the decision as to whether a command was properly received at the satellite is made on the ground, while for b), the decision is made at the satellite, the only purpose of the feedback channel being to cause the ground station to retransmit the command word if the satellite did not recognize the initial transmission. The decision feedback system then amounts to a one-way channel, since the satellite makes a decision after the initial transmission as to whether or not a command word was sent. If the transmitted command word is interpreted as a command, whether correct or not, the ground station has no further control. The following theorem is proved rigorously: ``It is always possible to specify a decision feedback system which gives the same error performance as a given complex feedback system.''
机译：描述了用于命令通道的两种类型的反馈系统。 a）复杂反馈–对于每个命令，标识都会通过反馈通道传递回去。 b）决策反馈–反馈通道仅用于说明卫星是否将传输识别为命令字。对于a），是否在地面上正确接收命令的决定是在地面上做出的，而对于b），是在卫星上做出决定的，反馈信道的唯一目的是使地面站如果卫星无法识别初始传输，则重新传输命令字。由于卫星在初始传输之后就是否发送了命令字做出决定，因此决策反馈系统相当于一个单向信道。如果将发送的命令字解释为命令，则无论该命令字是否正确，地面站都无法进一步控制。严格证明了以下定理：``总是有可能指定一种决策反馈系统，该系统具有与给定的复杂反馈系统相同的错误性能。''

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