数字码分多路复用遥测系统的研究

本文论述了数字码分多路传输的原理,提出了9路沃尔什码分数字多路复用系统的方案和原理逻辑电路,并进行了实验验证。特别对系统的关键与难点——沃尔什码组同步系统作了巧妙的设计。该系统对于需传被测参量较少的场合,是非常理想的传输设备。

On Digital Code Division Multiplex Telemetry System

Many papers on analog code division multiplex telemetry systems have been published.But the study on digital code division multiplex telemetry systems is quite limited.The disadvantage of the digital code division multiplex system is that the number of channels of the system is limited.For example,the number of channels of a digital code division multiplex system with 15-bit m sequence code is limited to only five. Now a study on digital code division multiplex telemetry system with Walsh code is presented.A 9-channel digital code division multiplex system with 15- bit Walsh code has been designed.In 1985,Ouyang pointed out that the number of channels of a digital code division system in general could not be more than seven3]. Because of the majority decision rule used in this system,it is impossible to detect the synchronizing signal by means of relative decoding.A 7-bit Barker code is used in the system to solve this problem of detection. Test results show that the design of the system is correct.The system is highly effective in suppressing the interchannel interference.