基于双模定位的荒野遇险人员报警终端的设计

Design of Alarm Terminal for Wild Workers in Distress Based on Dual Mode Positioning System

为了解决没有移动网络信号覆盖地区的荒野工作人员遇险救援不便的问题,设计了一种基于GPS(Global Position System)/北斗卫星导航系统的野外遇险人员报警定位终端;该报警定位终端以ARM(Acorn RSIC Machine)Cortex-M4为控制核心,搭配两种不同颜色的LED报警闪烁灯和液晶显示屏幕,并在报警终端上设计了功率放大器电路,工作时报警终端上的GPS/北斗双模芯片精确定位人员位置信息,采用LoRa(Long Range)无线传输模块将荒野工作人员的安全信息发送至附近的固定基站或者基站车上,其一旦接收到报警信息,便可迅速作出响应,及时对遇险人员进行救援;同时,在基站上使用增益为15.5dBi的定向接收天线,并设置LoRa无线传输模块的空中速率为0.3kbps,可以使荒野工作人员的报警信息传输距离达到最远;实验结果表明,该报警终端具有实用性强、定位精度高、便于携带、工作稳定可靠,传输距离长等优点。

To solve the problem that the rescue of wild workers without mobile network signal which in the coverage areas,an alarm positioning terminal for wild workers in distress is developed based on the GPS/BeiDou satellite navigation system.The alarm positioning terminal is presented which is used the ARM Cortex-M4 as the core.On the one hand,it has LCD screen and LED flashing light with two different colors,on the other hand,the power amplifier circuit is designed on the alarm positioning terminal.The terminal uses the GPS/BeiDou positioning module to position the information of wild workers precisely,the information of security for the wild workers is sent to the nearby fixed base station or mobile base station by the LoRa wireless transmission model.Once received the alarm information,the response is decided quickly,and the rescuing is implemented timely.At the same time,Using a receiving antenna with a gain of 15.5 dBi on the base station and setting the airspeed of the LoRa wireless transmission module to 0.3 kbps,the alarm information transmission distance of the wilderness staff can be maximized.Experimented results prove that the alarm positioning terminal has many advantages,such as the high practicability,high positioning accuracy,can be carried easily,stable and reliable working property,longer transmission distance and so on.