Design And Implementation Of Intelligent Forestry Terminal Based On High-precision Beidou Navigation Satellite System

In recent years,in order to adapt to the development needs of "precision forestry",the application of satellite navigation and positioning technology has been continuously expanded in forestry.The positioning accuracy of the ordinary GPS chip integrated in traditional mobile terminal equipment ranges from a few meters to more than ten meters,which is far from meeting the requirements of high-precision positioning in forestry.China is one of the largest mobile phone consumer markets in the world,and mobile phones have penetrated into every part of life.Take the above development trend into consideration,this paper,based on the Android platform,adopts the mobile terminal differential positioning technology,and uses the Doppler smooth pseudodistance algorithm to preprocess the satellite signal,then combines with the Qianxun location service to build a complete set of intelligent forestry mobile terminal system.First,combining Android7.0 above system support output satellite positioning data this development trend and the problem of the poor quality of satellite signal original information received by smartphones,this paper using the principle of Doppler Effect on satellite observations pseudorange smoothing research.According to the pseudorange observation equation and carrier phase observation equation,the Doppler frequency shift value of Doppler smoothing pseudorange equation is deduced.Using pseudorange observation equations to calculate the initial position information,and through the experimental simulation precision evaluationSecondly,the initial position information is combined with the Qianxun differential position service to realize the differential positioning of Android terminal,and then obtain highprecision position information,besides the simulation experiment is carried out to analyze the differential positioning accuracy of mobile terminal.On the basis of business requirements of precision forestry development,an intelligent forestry mobile terminal that can obtain highprecision position information in real time is developed by integrating the Qianxun-difference SDK and the differential signal analysis SDK.The mobile terminal adopts the MVP design pattern and utilizes the dependency injection framework provided by Google to reduce the coupling between Android components.Taking gaode map as the base map,the functions of forest cutting area definition and measurement,forest road mapping and planning,field mapping and track storage were researched and developed.Finally,build the back-end of mobile terminal software platform.MySQL database is adopted as the mobile terminal data storage tool,and the Spring Boot framework is used to configure the back-end project,and it is deployed in the ESC of ali cloud's elastic and scalable cloud server,so as to improve the stability of data interaction and the security of data storage.