变量施肥处方图识别与位置滞后修正方法

Prescription Map Identification and Position Lag Calibration Method for Variable Rate Application of Fertilizer

处方图变量施肥作业系统的技术关键在于根据处方图精确一致地"按图作业"。基于面向对象方法,设计并实现了变量施肥作业系统控制软件,提出基于作业机械位置的实时处方图识别算法,测试结果表明,单位处方识别时间不超过100 ms,能够满足实际系统作业的需要。在分析位置滞后原因的基础上,建立了变量施肥作业系统的位置滞后模型,通过田间实测试验,施肥时间延迟为1.84 s。

The key technology for map-based variable rate application of fertilizer lies in fertilizer should be applied precisely at each location within the field according to prescription map.Software for variable rate application control was developed based on object-oriented programming approach.A kind of algorithm for real-time application map identifying relying on machine location was designed and successfully implemented.Field test showed that prescription map cell was identified less than 100ms,which could meet the requirements of actual field application.A model to determine positional lag was developed for map-based variable rate application system by analysis of factors causing position lag.In addition,field tests were conducted and result showed that delay time was about 1.84s.