田间作业机组激光导引系统设计与试验

Design and Test of Laser Guidance System for Field Work Units

为提高机组田间作业行驶的直线性,利用激光方向性好、发散角小、分辨率好、不受电磁干扰、无累积误差等特点,设计了一种激光导引机组作业系统,该系统主要由激光发射装置、调平装置、激光接收装置等部分组成。系统工作时,由激光发射器发出的红光激光,被安装在拖拉机上的激光接收装置接收,通过解调转换为电信号,由LED灯指示出机组的方向偏移,从而辅助驾驶员调整拖拉机方向,进行直线行驶。详细阐述了系统的结构和原理,以及关键部分的设计。初步试验表明,200 m范围内,激光导引系统导向精度,受外界光照影响小,机组偏移距离在3.18 cm左右,相比划行器,提高了作业精度。

In order to improve the straightness of the field work,the laser guidance system was designed based on its good directivity,small divergence angle,high resolution,no electromagnetic interference and no accumulative error.This system is mainly composed of a laser emitting device,leveling device,laser receiving device etc.Laser emitter emitted the red light laser,which was received by the laser receiver installed on the tractor and converted into electric signal by demodulation,the LED indicated the direction deviation and assisted the driver in adjusting the direction and moving straightly.The system structure,working principle and the key parts design have been elaborated.The primary test showed the guidance accuracy of the laser guidance system was less affected by the external light,the distance deviation was about3.18cm in the range of200m.Compared with the row maker,the system improved the operation accuracy.