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根据数字基带传输系统的基本原理,设计了一套基于微处理的简易数字信号传输性能分析仪,系统主要由数字信号发送模块、信号传输模块和数字信号接收分析模块三部分构成,其中信号发送模块由数字信号发生器和信道模拟低通滤波器等组成。整个系统采用微处理器STM32F103实现码元速率的控制、信道切换、噪声电平调节、扩频与解扩以及同步信号的提取。系统经测试,解码的曼彻斯特编码数据与发送端完全一致,同步信号稳定和可靠。
According to the basic principle of digital baseband transmission system, a set of simple digital signal transmission performance analyzer based on micro-processing is designed. The system mainly consists of digital signal transmission module, signal transmission module and digital signal reception analysis module. The signal transmission module By the digital signal generator and channel analog low-pass filter and other components. The whole system uses the microprocessor STM32F103 to realize the control of symbol rate, channel switching, noise level adjustment, spread spectrum and despreading, as well as the synchronization signal extraction. The system has been tested and decoded Manchester encoded data exactly the same with the sender, the synchronization signal is stable and reliable.