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本文叙述了我国第一颗科学实验卫星的短波遥测系统的概况。这个卫星使用“东方红”乐曲的头三句作为识别信号,与遥测数据交替地传送。全文共分四部分:第一部分为短波遥测系统的体制及其参数的选择。遥测采用PAM-FM-AM体制,其特点有(1)用采样频率为3.2周的PAM测量0.01周的缓变信号和70周的速变参数;(2)采用锁相鉴频器在输入信噪比达到零分贝时收听到“东方红”乐音和卫星的有关工程参数。第二部分对星上的遥测部分的结构作了介绍。第三部分为遥测地面接收站的组成,特别是对天线系统及分集接收的方式加以叙述。第四部分介绍了遥测数据的采集及预处理装置。最后,对整个系统在卫星发射后的工作情况作了简单介绍。
This article describes the overview of the shortwave telemetry system of China’s first scientific experiment satellite. The satellite uses the first three sentences of “Dongfang Hong” as an identification signal, which is transmitted alternately with the telemetry data. The full text divides into four parts altogether: The first part is the system of the short wave telemetry system and the choice of its parameter. The telemetry adopts the PAM-FM-AM system, which has the following features: (1) 0.01-week slowly changing signal and 70-week fast changing parameters are measured by PAM with a sampling frequency of 3.2 weeks; (2) When the noise ratio reaches zero decibel, we hear the “Dongfanghong” music and satellite related engineering parameters. The second part introduces the structure of the telemetry section of the star. The third part is the composition of telemetry terrestrial receiving stations, especially the way of receiving the antenna system and diversity. The fourth part introduces telemetry data acquisition and preprocessing device. Finally, a brief introduction of the whole system after the launch of the satellite was made.