基于线性调频连续波雷达的甘蔗垄高检测

Detection of Ridge Height in Sugarcane Fields Based on Linear Frequency Modulation Continuous Wave Radar

甘蔗是我国南方的重要经济作物,但种植地多为丘陵山地,蔗垄高度起伏变化大.由于甘蔗掉落茎叶与杂草的遮挡以及部分甘蔗倒伏,超声与普通光电传感器难以准确测量甘蔗垄高,从而无法根据蔗垄高度变化自动调节切割刀盘高度,导致甘蔗机械化收割质量难以保证,影响蔗农经济效益.针对上述问题,设计了一个基于线性调频连续波雷达(LFMCW)的甘蔗垄高实时检测图形用户界面(GUI),对植被覆盖物建立杂波模型,在不同的植被密度、含水率的情况下,测试植被覆盖对甘蔗垄高检测精度的影响.结果表明:该GUI能够在不同的植被参数影响下测量雷达接收天线到蔗垄的距离,当安装天线到垄的距离不低于4 m时,最大测距误差为32.7 mm.

Sugarcane is an important economic crop in the south of China.However most of planting lands are in mountain areas and the height of sugarcane ridge variesgreatly.The cover of fallen leaves of sugarcane and weeds in the field and the lodging of sugarcane plants make it difficult for ultrasonic and ordinary photoelectric sensors to accurately measure the height of sugarcane ridge.As a result,the height of the cutting knife cannot beautomatically adjusted according to the change of sugarcane ridge height in realtime,and the quality of mechanized harvesting of sugarcane is difficult to be guaranteed,which affects the economic interests of sugarcane growers.Aiming at these problems,the authors of this paper have designed a graphical user interface(GUI)for real-time detection of sugarcane ridge height based on linear frequency modulated continuous wave radar(LFMCW),established a clutter model for vegetation cover,and tested the influence of vegetation cover on the detection accuracy of sugarcane ridge height under different vegetation density and water content.The results show that the GUI can accurately measure the distance between the radar-receiving antenna and the sugarcane ridge under the influence of different vegetation parameters.When the distance between the antenna and the ridge is no less than 4m,the maximum ranging error is 32.7 mm.