Design And Implementation Of A Low-Power GNSS Positioning Management System Based On LoRa

With the coming of the Internet of Things,positioning technology has played an increasingly important role in our lives.Among all positioning technologies,GNSS which has the characteristics of all-time and all-terrain,is the most widely used.In order to speed up positioning and reduce power consumption,GNSS modules generally use A-GNSS to assist positioning.After investigation,the A-GNSS modules on the market have the following shortcomings:(1)The positioning module uses 3G/4G network to transmit ephemeris data or positioning results,which not only has high radio frequency and standby power consumption,but also has more expensive telecom charges;(2)Most of positioning modules is stand-alone,users need to create a management platform for this module by themselves,which increases the user's management cost.According to the above problems,this paper investigates the mature low-power networks on the market,and proposes a Lo Ra-based low-power GNSS positioning management system.The system consists of a positioning module and a cloud server.The system realizes the transmission of ephemeris data and positioning data through Lo Ra networking.Lo Ra has low power consumption and long transmission distance,without additional network charges.The system adopts the cloud coordinated positioning scheme,and the position calculation of the module carried by the cloud platform effectively reduces the size of ephemeris data,positioning time and positioning power consumption.The positioning module selects JEDI-200 as the positioning module,ASR6502 as the MCU and radio frequency module,and is set to work in Class B mode.The module can be used alone or with an external MCU for secondary development.The cloud platform uses Springboot+Redis+My SQL to develop,and uses Dubbo and Rabbit MQ middleware to complete distributed deployment which in order to improve concurrent processing capabilities.According to requirements,the platform realizes the three functions of device management,ephemeris distribution,and location result calculation,and provides an easy-to-operate device management interface through which users can perform status query,location query,track query,and one-key Operations such as positioning and parameter modification.This article tested the positioning module and cloud platform respectively.After testing,the positioning accuracy of the module is 10 m RMS,the single positioning time is 2.37 s,and the single positioning energy consumption is 101.76 m J,which is significantly improved compared with similar products;the cloud platform functions normally and can provide users with convenient device management service.The functional indicators of this system meet expectations and are suitable for the Io T industry,which is known for its low power consumption.