甚高频全向信标改造成数字通信测向综合化系统的几种新方案

New Methods to Reform VOR into an Integrated System of Digital Communication and Direction-finding

受卫星导航的冲击，甚高频全向信标（VOR）在未来航行系统中将失去它的重要地位，最终可能关闭。为充分利用VOR的频段和设备资源，本文提出了四种VOR发射机改造方案：第一是间断发射的慢速时空调制系统；第二是连续发射的二进制四相时空调制系统；第三是码分有参考信号时空调制系统；第四是时分有参考信号时空调制系统。给出了四种系统信号调制、编码、接收机设计等解决方案。改造系统的主要优点是将数字通信和无线定向综合为一体。

Impacted by satellite navigation ,VHF omnidirectional radio range(VOR), being a necessary navigation facility, will have litter and litter important role in future navigation system and may be turned off . To take full advantage of the frequency bands and equipment of VOR, four reforming methods are proposed:(a)burst transmitting slow space-time modulation compatible to TDMA system; (b)binary non-quadrature four phases space-time modulation suitable for continue transmitting; (c)code-division space-time modulation with reference signal; (d)time-division space-time modulation. The solution of modulating signal through space and time domain, coding signal space, recovering synchronizer carrier frequency, demodulating coherently message and estimating azimuth are given. An advantage of the new systems lies in integrating of digital communication and direction-finding. [