新型收发讯机微机终端的研究

STUDY OF A NEW TYPE TRANSMITTER-RECEIVER BASED ON MICROPROCESSOR

本文研究了基于数字信号处理器TMS32020的新型收发讯机,利用TMS32020较强的数字信号处理功能,实现对收发讯机中频信号的解调,从根本上解决了传统ON/OFF制式收发讯机存在的问题。同时,利用TMS32020速度快、处理信息量大的特点,在传统收发讯机的基础上,增加了巡回自检、数码显示、定时发讯、相差保护比相等功能,完善了原有收发讯机的各项功能。此外,在硬件不变的基础上,实现FSK制式(键控移频方式)的收发讯机,其中,主要研究了使用FFT算法实现多命令信号传送的收发讯机。

This paper presents a new type transmitter-receiver used in high frequency protection, which is based on the digital signal micro-processor TMS32020. The problems existing in the coventional transmitter-receiver are basically solved by taking advantage of the TMS32020's strong function in digital signal processing in demodulating the medium frequency signal of the transmitter-receiver. The fast speed and the large quantity of information in digital processing of TMS32020 are utilized so that several new functions such as automatic diagnosis, digital display, timed transmitter-receiver and phase comparison in phase differential protection, etc. are incorporated into the new type transmitter-receiver FSK mode (key-controlled frequency-shift mode ) transmitter receiver is implemented without any hardware change. The demodulating algorithms suxh as FFT transform are mainly discussed in the paper.