Planter State Monitoring System Based On Beidou/GPS Dual Mode Differential Positioning

With the continuous improvement of China's agricultural mechanization,large farms continue to increase,The type and number of work machines have grown tremendously,At the same time,due to the expansion of the scope of agricultural operations,field communication is difficult,resulting in lagging agricultural machinery operations,poor timeliness,low utilization of agricultural machinery and other issues have become increasingly prominent.It is difficult for farm managers and operators to be quick,accurate,and detailed in their operation status.Inefficient management of agricultural machinery and waste of resources have seriously affected the efficiency and quality of operations.To solve the problem of lagging information in the operation of agricultural machinery,difficulties in monitoring and dispatching,and other issues.In this paper,we have designed and developed a set of remote monitoring system for plant state based on technologies such as satellite positioning,sensors,wireless transmission,software development,and database development.Basically achieved the expected function.The main contents of this paper include the following aspects:(1)Design and experimental study of differential positioning of seederThrough the detailed understanding of differential positioning principles and algorithms,the positioning technology based on Beidou/GPS dual mode differential is used to accurately position the seeder.The UBLOX-NEO-M8 T module that supports multi-system joint positioning and has original observation data output is used for positioning data acquisition.Configure the original observation data output statement and frequency of the base station module and the mobile station module.Use single point positioning to determine the position of the base station.Select AS69-T20 wireless transmission module for data transmission between the reference station and the vehicle terminal.Reasonably configure the RTKLIB differential decomposition software to solve the original observation data and output high-precision differential positioning data.After test and data analysis,The maximum error of single point positioning is about 19.78 m,Mobile station static differential error of about 7.88 cm,Mobile station dynamic differential error of about 29 cm,which can meet the positioning requirements of the seeder.(2)Planter Fertilizer Condition Monitoring DesignAccording to the analysis of seeder monitoring requirements and characteristics of seed fertilizer,the whole scheme of seed fertilizer monitoring was designed.An ultrasonic sensor is used to monitor the height of the seedbox fertilizer tank,and an infrared photoelectric sensor is used to monitor whether the seeding tube row fertilizer pipe is normally discharged.In order to assist in judging the state of the fertilizer,the position of the lift arm of the tractor is monitored using a travel switch.According to the characteristics of the sensors,three kinds of sensors are designed with reasonable installation methods.Using STC15F408 AD MCU as Fertilizer Monitoring Data Controller.C language was used to write the lower computer program for seed fertilizer monitoring data collection,and the fertilizer monitoring data packet format was designed.(3)Design and development of vehicle terminal software and GPRS wireless transmissionThe main functions of the vehicle terminal software mainly include two aspects.On the one hand,it is the display of positioning data and fertilizer monitoring data,processing and partial job information display.According to the actual needs of the display interface design,program design,data packet format design.On the other hand,the AT command is used to debug the GPRS module to enter the working state,establish a connection with the server,and automatically send the data packet to the remote monitoring system.The GPRS technology is introduced in detail from the aspects of GPRS principle,TCP/UDP protocol and AT instruction introduction.(4)Design and implementation of planter operation information management systemThe seeder operation information management system uses LABVIEW2014 as a development platform.Through the analysis of requirements,the overall function design and programming of the system are performed.The system includes six modules,which are user module,server module,information display module,history data query module,parameter setting module,and module.User data,location information,fertilizer information,status information,and machine parameter information are designed.You can use SQL statements to query and delete,and export to EXCEL and print functions.In order to understand the current operation status of the seeder in real time,combined with the information received by the system and the operating parameter characteristics of each state of the seeder,a kind of operation state discrimination algorithm for the seeder is designed.According to the data analysis of the seeder's dynamic positioning test,it is found that the speed and heading of the seeder during normal operation and cornering show more obvious regularity.Each part of the system has been tested to have good experimental performance,and software and hardware parts can achieve preset functions.After further improvement and improvement,it can be applied to planters for remote information monitoring and status analysis.It is of great practical value and significance to improve the operation efficiency of the planter and remote monitoring,scheduling and management of the planter.