概述指令系统用于遥控辐射实验、通讯及姿态控制分系统。本文介绍卫星指令分系统的功能。图1所示为卫星指令分系统的主要部分方块图,并示出地面部分以供参考。含有八位编码指令字码的甚高频信号,通过地面天线向卫星发射。其中前两个比特用于字码同步,其余六个比特(3个“1”和3个“0”的组合)为指令信息。所用的编码为一 Overview Instruction system for remote control radiation experiments, communication and attitude control subsystems. This article describes the functionality of the Satellite Command Subsystem. Figure 1 shows a block diagram of the main parts of a satellite command subsystem and shows the ground part for reference. A VHF signal containing an eight-digit code word is transmitted to the satellite via a terrestrial antenna. The first two bits are used for word synchronization, and the remaining six bits (a combination of three “1’s” and three “0’s”) are instruction information. The encoding used is one