低功耗海上救援个人示位标的设计与实现

Design and Implementation of a Low Power Personal Location Beacon for Maritime Search and Rescue

设计和实现了一种改进的海上救援个人示位标,该示位标具备北斗导航定位能力和北斗短报文通信功能,同时具备人体生命体征监测上报和触水启动的功能,并支持COSPAS-SARSAT卫星搜救系统.为延长示位标的工作时间,设计了一种动态电源管理方法,实现了对不同功能电路电源通道的控制.同时,针对示位标的待机模式和工作模式,设计了超低功耗待机电路和低功耗软件控制设计方案,减少了电能的浪费.最后,分别在山东省威海市和浙江省宁波市至舟山市附近海域对原型样机进行了实际场景测试.原型样机的测试结果表明:示位标在待机状态下,电流为2.3μA,待机时间超过5年;示位标在接收北斗信息状态下,电流为79 mA;示位标在发送状态下,7 000 mAh 7.4 V电池可发送200次求救信息.与现有产品相比,本文提出的海上救援个人示位标具有更低的待机功耗.

This paper designs and implements an improved personal location beacon(PLB) for maritime search and rescue.The PLB has the functions of Beidou navigation and positioning,Beidou short message communication,human vital signs monitoring and reporting,and water touch trigger.What's more,the proposed PLB supports the COSPAS-SARSAT system.To extend the working time of the PLB,this paper introduces a dynamic power management method to conduct the power channels of different functional circuits.Meanwhile,this paper designs an ultra-low power consumption standby circuit and low power consumption software control scheme to reduce power dissipation.Finally,the prototype of the PLB is tested,respectively,in the adjacent sea areas of Weihai City in Shandong Province and Ningbo to Zhoushan City in Zhejiang Province.The test results of the prototype show that in the standby state,the current of the PLB is 2.3 μA,with a standby time exceeding 5 years;in the state of receiving the Beidou short message,the current is 79 mA;and in the state of transmitting rescue messages,the 7 000 mAh 7.4 V battery can send 200 distress messages.Compared to existing products,the proposed PLB in this paper for maritime rescue has lower standby power consumption.