基于CPLD的高速数传电台设计与实现

Design and Realization of CPLD-based High-speed Data Radios

采用差分技术可以减小GPS接收机系统误差,提高定位精度,设计的无线数传电台主要用于GPS基准站和用户机之间通信,传输差分信息,完成GPS接收机差分定位功能。设计采用单片Modem芯片,FSK调制方式,外加接收低噪放、发送功放以及上、下变频,构成无线数传电台的硬件电路。在2.2~2.3GHz频率下测得所设计的无线数传电台能以115.2kb/s调制码率、-90dBm接收灵敏度完成无线数据收发,不仅能很好地用于GPS差分定位系统,而且设计简捷,实现成本低,可广泛应用于一些民用场合。

Taking the differential technology can reduce the error of the GPS receiver and increase the positioning accuracy.The wireless data radio of this design is mainly used for the communication between the GPS reference station and the user receiver,which can transmit the differential data and complete the differential positioning of the GPS receiver.This paper uses a single-chip Modem chip with the FSK modulation mode for the data radio design,which consists of the receiver's low noise amplifier,the transmitter's power amplifier and the up-down conversion.Test results show that the wireless data radio can complete the accurate wireless data communication with the 115.2kb/s modulated data rate and the-90dBm reception sensitivity at 2.2~2.3GHz.The design can not only be used in the GPS differential positioning system well,but also be widely used in some civil area for its simple design and low cost.