桁架式农田高通量信息远程采集平台设计与试验

    Design and experiment of the truss-type platform to acquire high-throughput information from farmland using remote sensing

    • 摘要: 针对当前作物表型采集平台存在适用性差、采集数据量少、对农田配套设施要求高且需要人工实地采集等问题,该研究设计了一种基于桁架导轨结构的农田高通量信息远程采集平台。采集平台的运动轨道为桁架导轨结构,平台搭载相机、雷达、北斗及集成式环境传感器,可在轨道上进行前后(X轴)、左右(Y轴)、俯仰(P轴)运动,通过4G通信方式实现作物表型信息及农田环境信息的远程多方位采集。田间试验表明,4G远程通信端到端的最大延时不超过60 ms,远程监控端和采集平台端可在极短时间内进行数据交互;在远程监控端下发XYP三轴阶跃信号控制指令,采集平台三轴的运动速度分别为0.5 m/s、0.0769 m/s和1.81°/s,表型传感器可在较短时间内到达目标位置进行信息采集,响应稳态误差分别为0.04 m/s、0.001 m和0.5°,运动过程平滑稳定,保证采集数据质量;Y轴从最左端移动到最右端跨度2 m的过程中,可有效对10行玉米产生近距离有效拍摄,P轴从-60°到60°的俯仰拍摄中,可对玉米苗带行垂直、前侧、后侧等几种不同的方向进行表型采集,且相机图像与雷达点云采集的一致,相机旋转俯仰拍摄的过程中受光照影响较小;对采集到相机及雷达数据融合得到具有颜色信息的三维点云,通过融合后的信息对油菜进行分株及提取株高信息,与人工实际测量株高值对比得到的R2为0.96,表明采集数据效果满足后期实际作物表型参数的分析与处理;单区域的环境信息采集平均耗时10 s,各项环境参数组内无明显差异,与实测数据相比精度均大于0.95。研究结果表明该采集平台满足对农田高通量表型数据的智能化采集要求。

       

      Abstract: Crop phenotype collection is currently required for the supporting facilities of farmland. Manual collection is also lacking in the applicability and less collected data in fields. In this research, a remote collection platform was designed to acquire high-throughput information on farmland using a truss guide rail structure. The collection platform was composed of the movement rail with a truss rail structure, a camera, LiDAR, a Beidou module, and integrated environmental sensors. There were movements in the forward and backward (X-axis), left and right (Y-axis), and pitch (P-axis) on the rail. The remote multi-directional collection of crop phenotype and farmland environmental information was realized using 4G communication. The field test showed that the maximum delay of 4G remote end-to-end communication was 59 ms. The data interaction between the terminals of remote monitoring and collection platforms was carried out in a very short period of time. The control commands of X, Y, and P axis step motion were released from the remote monitoring terminal. After that, the X, Y, and P axis motion speeds were 0.5, 0.076 9 m/s and 1.81°/s, respectively. The phenotype sensor also reached the target position for information acquisition in a relatively short period of time. The errors of response steady state were 0.04 m/s, 0.001 m and 0.5°, indicating the smooth and stable motion for the data quality of collection; The close-proximity capture was realized in the Y-axis from the leftmost end to the rightmost end of the span of 2 m in the process of the 10 rows of maize. The vertical, front and back sides of corn seedlings rows were also collected in the pitch shooting of the P-axis from -60° to 60°. The obtained images were consistent with the radar point cloud. There was less influence of the light on the camera rotation and pitch shooting; A three-dimensional point cloud with color information was generated from the collected images and radar data. The plant height of oilseed rape was extracted using the fused information. The R2 value of plant height was 0.96, compared with the manual measurement. The collected data fully met the actual processing on the crop phenotypic parameters at later stages. The average time was 10 s for the collection of environmental information in a single area. There were no significant differences in the environmental parameters within the group. The accuracy was more than 0.95, compared with the measured data. The collection platform fully met the requirements of intelligent collection for the high-through phenotypic data in farmland.

       

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