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产量信息获取是精准农业实施过程的重要组成部分。为提高测产精度,缩小国内外农机装备的差距,本文设计开发了一种CAN总线架构的测产系统。该系统主要由多种传感器、智能节点、田间计算机和SD卡4部分组成,实现了产量数据采集、显示及存储等功能。为了减小升运器转速对测产的影响,提出修正系数法对谷物流量进行修正,室内试验结果表明:修正后谷物流量最大误差为2.63%,平均误差为2.04%。应用测产系统在田间进行实验得到产量数据,并采用产量模型和反距离权重法计算单位面积产量进行计算和插值,最后绘制了产量分布图。
Yield information acquisition is an important part of precision agriculture. In order to improve the measurement accuracy and reduce the gap between domestic and international agricultural machinery and equipment, this paper designs and develops a measurement and production system with CAN bus architecture. The system consists of a variety of sensors, smart nodes, field computer and SD card 4 parts, to achieve the output data acquisition, display and storage functions. In order to reduce the impact of elevator speed on the test, a correction factor method is proposed to correct the grain flow. The indoor test results show that the maximum error of the corrected grain flow is 2.63% and the average error is 2.04%. Applying the production measuring system to experiment in the field to get the output data, calculating and interpolating the yield per unit area by using the output model and inverse distance weighting method, and finally drawing the output distribution map.