Research On Laser Detection Performance Of Close Quarters Target

Photoelectric detection technology has been widely applied in aviation, spaceflight, colliery, industrial buildings and traffic fields, especially the infrared photoelectric detection technology which adopts the principle of single wavelength to detect, and the influence is small when the infrared photoelectric detection disturbs by the environment. However, the diversity of the environment will take false target information into the detection system, it will affect the detection result evidently. Therefore, an important method to distinguish the false target is that researching and analyzing the target characteristics, which will also reduce the sensitivity of laser detection system about the environment. The research on the target characteristics will provide powerful foundation on improving the detectability of the laser detection system for close quarters target detection. This paper is based on the principle of detection, and the transmitting and receiving part of the laser detection system are designed. The researching on the target characteristics and detection performance are carried out. A series of research for improving the detection system performance are provide the foundation for theoretical design and analysis method of engineering practice.On the basis of laser detection mechanism, the transmitting laser system and receiving detection system are researched and designed. The equivalent analysis method is used to analyze the noise characteristics of the transmitting and receiving circuit. Based on the hardware platform, the calculation method of radiation brightness about environmental background and the reflected radiation due to irradiation from the sun and laser is put forward, the calculation model of the function is also given. This paper uses a small surface element sub-divisible method to establish the calculation model about the detection range and target luminance, circuit noise and the total surface area of the target. The research on the echo characteristics is start with the transmitting signal characteristics. The calculation method of the luminous flux of the target is studied, the same with the function relationship between luminous flux and the limit detection distance. And we also analyze the affecting factors about the detection performance of the detection system. According to the simulation, the surface fitting about the radiation brightness of environmental background, the reflected radiation due to the solar radiation on the target and radiant energy received by detector, the luminous flux and the limit detection distance are given out. On the foundation of simulation results and hardware platform, we debugged the circuit and analyzed the oscillogram from the experiment.Through the data obtained from experiment, we can clearly see that, under the same testing condition, the same object in different condition of detection distance, the farther the distance, the weaker the reflecting echo energy, whereas the stronger. In the same detection distance, the larger object size, the stronger the reflecting echo energy.