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子午仪卫星的广播星历表可以用硬件解码,也可以用计算机实时解码。本文介绍的是利用计算机非实时解码的一种简便方法。与国内生产的译码器相比,本设备由于使用程序事后纠错解码,所用硬件十分简单,制作周期短,成本低廉。不计电源、穿孔机和接收机等设备,硬件的成本仅100多元。原理和结构本译码器由识别电路及解码程序两部分组成。识别电路将双频多卜勒接收机送来的、已解调的时间轨道码按码字编码规则用快速穿孔机纸带穿孔输出。解码程序将识别电路穿孔输出的“半比特”纸带信息按电文规则解码、纠错并以表格形式打印出子午仪卫星的广播星历表。
The meridional satellite broadcast ephemerides can be decoded in hardware or in real time using a computer. This article describes a simple way to use a computer for non-real-time decoding. Compared with the domestically produced transcoders, the device uses error correction decoding after the program, and the hardware used is very simple, the production cycle is short, and the cost is low. Excluding power, piercing machines and receivers and other equipment, the cost of hardware is only 100 yuan. The principle and structure of the decoder by the identification circuit and decoding program composed of two parts. The identification circuit sends the demodulated time-orbit code from the dual-frequency Doppler receiver in a punctured, perforation, perforation of the punctured paper according to the code word coding rules. Decoding program will identify the circuit perforation output “half-bit” strip information according to the rules of telex decoding, error correction and a table print meteorological satellite broadcast ephemeris.