900MHz 频段数字通信机的设计

DESIGN OF 900 MHz FREQ-RANGE DIGITAL RECEIVER AND TRANSMITTER

阐述了为机动车辆不停车自动收费系统而设计、研制的９００ＭＨｚ频段数字通信机的组成；详细介绍了收发信电路、ＶＣＯ电路、频率合成器及微机控制原理．实现了机动车辆通过收费站不停车的快速、可靠和准确收费．

This paper describes the composition of 900 MHz Freq_Range digital receiver and transmitter for the automatic charge system with the vehicle runing, and introduces their circuits, VCO circuits, frequency synthesizers, and microcomputer control principle in detail. The rapid, reliable and accurate tolls are achieved when the vehicle passing charge station.