| The annual grain demand of China exceeds one trillion kilograms,but the area of cultivated land is decreasing year by year,and it is imperative to increase the output of grain.The yield of grain will be affected by many factors,among which the quality of seeds will directly determine the yield of grain.Cultivating excellent seed varieties is of great significance to increasing Chinese grain output.Considering that breeding high-quality varieties requires comprehensive testing and verification,the scientificity and reliability of breeding experiments have become the key to breeding projects.At present,Chinese breeding experiments are still in the primary stage,mainly artificial seeding or semi-artificial seeding,there are problems such as low mechanization,low intelligence and low seeding efficiency,which directly limit the scale and effect of breeding experiments in China.In this context,this article mainly researches from the following aspects,and develops a high-precision and high-intelligent precision seeder control system,which is used in breeding experiment.Firstly,the current situation of breeding machinery in China is analyzed,and the development needs of breeding machinery in China are summarized on the basis of the existing problems,thus the overall scheme of precision seeder control system in the community is formulated.According to the overall scheme,the control system is divided into three parts: collection mechanism,control mechanism and executive mechanism.Secondly,the overall architecture of the hardware design is determined,and the circuit design and device selection of the three mechanisms are carried out respectively,with the emphasis on the research of the control mechanism: LPC2368 microprocessor is selected,and the circuit design and packaging are carried out with the software of Altium designer 16.Thirdly,the system software design was carried out,the Linux system and cross-compilation environment under the PC were set up,and the configuration of the Qt environment was completed,focusing on the functional analysis and software implementation of core control parts such as Beidou information solution,stepper motor control and DC motor control.And the design of the system interface uses Qt to complete.Then,the control strategy of the precision seeder control system in the plot is proposed:designing a numerical segmentation method based on the trigonometric identity so as to improve the two-point ranging model of the earth,and solving the accuracy problem of calculating double precision floating-point number with ARM7 processor;The stroke self-calibration algorithm is designed,which combines the rotary encoder control with the Beidou positioning control to solve the real-time accurate control problem of the cell length and the interval length;A path self-alignment algorithm is designed,which combines arithmetic mean filter with kalman filter to solve the problem of location alignment of each cell.Finally,the test environment of the system is set up.And combined with the actual needs of the breeding experiment,the precision seeder control system is tested for the three core problems of cell length control,interval length control and cell alignment.The results of the test show that the system design is reasonable,which can effectively improve the scientific and reliability of breeding experiments. |
