Research & Development On Receiver And Controller For Laser Controlled Land Leveling System

Laser-controlled land leveling system is an important tool for precision surface irrigation. It can obviously improve the land leveling accuracy and seedbed conditions on the field, achieve a high quality of surface flood irrigation. This research was a part of the project " Research and Development on laser controlled leveling system" and aimed to develop a lower-cost laser receiver and controller with good performances for precision land leveling.A laser receiver was developed based on domestic photoelectric elements. The low-power analog signal was amplitude-modulated in low SNR. With the specifications of color glass, the high-transmission filter with narrow pass bandwidth was investigated to prevent from environment light disturbance. A low-noise preamplifier was designed to amplify the low-power signal. The elements were mounted with appropriate arrangement on the bracket so that the receiver was to work without dead angle.A single-chip microprocessor-based controller was developed to process the preconditioned laser signal to control the hydraulic system on the scraper. The fuzzy logic control was used to develop the system control software.In the dry and paddy fields these two devices were integrated to test with good results. The accuracy of laser receiver was about 3 mm. The controller was compatible with both domestic and imported hydraulic valves.Finally, there were a summarization of the research and some ideas to improve the system.