Development And Application Of Airport Enclosure With Long-range Laser Photoelectric Alarm System

At the airport, military bases, power plants, oil depots and other important areas, in order to prevent the illegal invasion and sabotage activities, people usually set some boundaries or barriers blocking things in the periphery of these areas week, and lay persons to strengthen patrols. The traditional means of prevention are often used by the human against time, geographical, personnel quality and energy and other factors, there would inevitably be gaps and errors, difficult to adapt to the need for security. Therefore, the installation of the application of advanced perimeter detection system has become a necessary measure. Remote laser alarm system, following the sensing cable, infrared shooting system, is the third generation of products. As the laser is monochromatic good, and good collimation, so, than traditional methods, as well as with infrared preventive farther, more efficient, more stable, stronger anti-interference.This thesis completed the selection of the laser and the laser receiver circuit and commissioning of the 89C52 microcontroller timing circuit and CAN bus communication circuit. On the basis of them, this paper did 70 groups of people passing laser grating experiment, and debris falling through the grating of 35 experimental groups, recorded the three-way laser blocking time. Because of the selection of time based on blocking laser as a judge, according to the data collected, this paper chose the algorithm which is based on PCA of the template matching for training samples that have been classified. Using the distance of sample to a known sample points to determine whether the alarm to be done. Relative to the same laser that is blocking the three-way alarm products, this design will undoubtedly enhance the capacity of recognition of the event of human passing through. At the latter part of this paper made the classification method of Bayesian error test for improving the reliability of decision-making of microcontroller, and theoretical analysis of experimental data.In the process of algorithm analysis, the use of experimental data obtained the time characteristics of the laser grating by the human leg, waist and chest. This three-way height of the laser can be adjusted according to the terrain, the paper design height were 40cm,80cm and 120cm.This design is mainly based on the Airport Security field, but for geographical formation, vast areas of prevention demanding the same high value.