一种塔康信标扩展数据广播功能的方法

基于塔康信标发射信号占空比低的现状,提出扩展信标数据广播功能。通过分析系统信号格式,计算信标数据广播可用时间间隙。设计了一种广播信标识别码和坐标数据的方法,将数据按固定消息格式编码为脉冲序列,插在主基准群后播发,使信标可同时提供定位与数据广播服务。经仿真分析,增加该数据广播功能后,信标测距应答概率仅降低0.2%,发射信号带宽保持在300kHz内,测位精度没有发生变化。

A Method of Adding Data-broadcast Function on Tacan Beacon

After analysis of Tacan signal structure, an idea of adding data-broadcast function on Tacan beacon is proposed in view of low occupancy rate of uplink channel. The maximum time can be used for broadcasting data per second is estimated according to response probability. A method of broadcast identification code and geodetic coordinate of beacon is then designed, in which information is encoded as pulse train and inserted after main reference pulse group. The simulation and analysis results show that the method has no influence on angle measurement performance, and the bandwidth of signal eradiated by beacon maintains within 300 kHz. The response probability of beacon is merely reduced by 0.2% when the data broadcasting function is added.