基于北斗短报文的低功耗定位系统的设计

Design of Low Power Location System Based on Beidou Short Message

为解决传统定位系统功率损耗大,无法在脱机状态下长时间工作的问题,设计了一款基于硬件低功耗和软件“正常工作-休眠工作”双模式循环的定位系统。在硬件部分,该系统选用低功耗单片机STM32L431控制GPS定位模块CNS35和北斗短报文模块TM0558,并对供电电路实时采集。在软件部分,加入了“休眠工作”模式,实现与“正常工作”模式的循环切换。结果表明:该低功耗定位系统可实现定位误差低于2.5 m、通信成功率≥85%、双SIM卡切换等基本功能;且在单次循环为4 min的前提下,“正常工作2 min-休眠工作2 min”的工作方式将能量损耗降低至“正常工作4 min”方式的64.7%,续航时间延长了11.16 h。

In order to solve the problem that traditional positioning system cant work for a long time in off-line state due to high power loss,a positioning system based on hardware low power consumption and software“normal work-sleep work”dual mode cycle was designed.In the hardware part,the system used low-power single-chip microcomputer STM32L431 to control the GPS positioning module CNS35 and Beidou short message module TM0558,and collected the power supply circuit in real time.In the software part,the“sleep work”mode was added to realize the cyclic switch with the“normal work”mode.The results show that the low power positioning system can realize the positioning error less than 2.5 m,communication success rate≥85%,dual SIM card switching and other basic functions.In addition,under the premise of a single cycle of 4 min,the working mode of“normal operation 2 min-sleep operation 2 min”can reduce the energy loss to 64.7%of the working mode of“normal operation 4 min”,and prolong the time of endurance by 11.16 h.