Research And Development Of Vehicle-mounted Platform For Crop Growth Information Acquisition

To get the online,real-time,high-throughput crops information,the vehicle-mounted platform for crop growth information acquisition solved the problems of the current portable equipment including small area monitoring,high labor intensity,low efficiency,inaccuracy and combining with no variable fertilization operations.In this paper,the sensing device hardware of vehicle-mounted crop growth information based on virtual instrument technology was developed.The information transmission network based on CAN-bus technology was built.The software systems based on Lab VIEW was designed and developed.The platform combines crop information perception,analysis,processing in one,breaks the original single monitor mode.With the expansibility and portability of virtual instrument,the platform enhances the vehicle platform usability,and improves development of intelligent crop cultivation equipment in our country.Firstly,this paper described the research and development of recent domestic and international agricultural information monitoring equipment.The great advantages of virtual instrument system in automated test provided the research ideas.Combined with the features and advantages of LabVIEW software,the paper proposed purpose and significance of this research,determined the contents and technical route,completed the overall design of the vehicle-mounted platform for crop growth information acquisitionSecondly,this paper completed the overall design of the vehicle-mounted hardwares.Three optimized circuits(RC low-pass filter circuit,Butterworth filter circuit,second order infinite gain multiple feedback filter circuit)were designed and compared,applicable to vehicle-mounted sensor.The research studied the commonly used four data collection and transmission modes(RS232C,RS485,CAN-bus,PXI)under the working conditions,selected the CAN bus transmission scheme with the advantages of the speed,good stability,strong expansion and so on,and finally designed CAN bus processing-node network of vehicle information that integrates signal conditioning circuit,MCU circuit,CAN bus interface communications circuit.In addition,this paper designed the vehicle-mounted PC software’s framework architecture of crop monitoring system based on Lab VIEW,which was divided into user management,online monitoring,data management and offline analysis.Software features includes data acquisition and storage,the show of value and chart,intelligent alarm,personnel monitoring,map visualizations operation.With MapInfo software as a supporting GIS software,the paper completed the binding GIS systems with databases on the secondary development in the Lab VIEW environment.Automatic generation of crop-grow spatial distribution of information through off-line data analysis and management system provides direction and technical support for the development of post-fertilization regulation module.Finally,in order to test the performance of the monitoring system,the paper studied the stability of the vehicle-mounted sensors’ output signal and wrote compensation optimization algorithm.Field trials were conducted in wheat and rice field.In the wheat trial,the agronomic parameters results(NDVI,RVI,DVI)of FieldSpec4 spectrometer were compared with the crop grow sensor.The correlation coefficients were 0.90,0.89 and 0.88,and the results of RMSE were 0.04,0.14 and 0.05.In the rice trial,Topcon spectrometer was added.The NDVI’s correlation coefficient of the FieldSpec4 and Topcon was 0.82,the correlation coefficients of the platform with that two instruments were 0.89 and 0.86,and the result of RMSE was 0.06.The results verify that the system has the real-time monitoring,accuracy and efficiency.The system can meet needs of real-time monitoring information to the rice and wheat,improve the mechanization and informatization level of agricultural information,and has some significance to promote the combination of agriculture and mechanization.