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A NOVEL LASER RECEIVER USED FOR LASER-CONTROLLED LAND LEVELING SYSTEM

A NOVEL LASER RECEIVER USED FOR LASER-CONTROLLED LAND LEVELI...

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亚洲精细农业与计算机农业应用联合大会

作者： Xingfu Xie 1 Gang Liu 1 Xiaozhe Lang 1 Qingkuan Meng 1 1 Key Laboratory of Modern Precision Agriculture System Integration Research China Agricultural University Ministry of Education Beijing 100083 China

Laser receiver was a key component of the laser-controlled land leveling system. In order to obtain better quality in laser signal detecting, operating range, stability and noise deduction, a novel design of a laser receiver based on integrated IC was developed. Red organic glasses were used as the in-light window, which could greatly reduce the background light into the laser receiver. Interference filters were also used at the laser receiver to further reduce the background light. Photo-electric cells were used to transform light signal into electrical signal. The low-noise pre-amplifier and main amplifier based on integrated amplifier was used to amplify the weak electrical signal effectively. The wave shaping circuit was employed to achieve better signal conditioning from spike pulse signal to digital TTL signal. The widening circuit was used to stretch the pulse width in order to be processed by the follow-up circuit more easily. Field experiments were carried out. The results show that the receiver work stable within 150m for all directions. The vertical operating ranger is 28.4cm which allows an accuracy of 2cm in land leveling.

关键词： Laser-controlled Land Leveling Laser Receiver Pre-amplifier circuit wave shaping circuit Widening circuit

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