Study On The Target Recognition Method Of Line-scan Lidar

Armored target identification is the core problem to be solved for surface-to-surface missiles.The diversified,complicated and hierarchical pattern of future army theater operations requires effective countermeasures in detection and control to ensure effective damage.The ability to detect and identify different types of targets is the key technology for damage decision and control of smart missile weapon system.Under the complex battlefield background,the three-dimensional contour information of the target can be obtained directly by the laser imaging radar(LADAR)in the detection and recognition of the ground object target,which is conducive to the accurate identification of the target and vulnerable parts.Its correlative technology and object recognition method have become the research focus and hotspot in many countries.Line-scan lidar adopts linear array APD photodetector as the receiving device.In the scanning process,this kind of ladar can obtain the distance and intensity information of the target progressive pixel,which has the advantages of simple structure and high imaging rate[1].In this paper,a method of target identification based on linear array laser scanning is studied for target identification of low-altitude laser radar carrier under the condition of flyby at the end of the airway,so as to solve the problem of target identification of armored vehicles under the condition of high-speed and multi-angle rendezvous.By studying the working principle of the target recognition mechanism of line-scan lidar,the influence of background noise on target recognition is analyzed.Completed the design of the preamplifier circuit and the main amplifier circuit,and obtained the implementation scheme of each module circuit.Developed line-by-line transmitting module and receiving module for line-sweep laser radar jointly with related research institutes.The simulation and experimental results show that the designed circuit satisfies the system requirements.Aiming at the target recognition problem of line-scan lidar under the condition of multi-angle rendezvous of missile and target,a target recognition algorithm based on fuzzy recognition is proposed.Firstly,it studies the scanning principle of the missile-loaded laser radar,establishes the mathematical model of target recognition in the multi-intersection mode,and obtains the single-scan feature information of the linear array laser radar.The second,the correlation degree of the target contour is calculated by the gray correlation analysis of the target laser scanning data according to the row,column and the set target information.It adopts the second-level fuzzy comprehensive evaluation and converts the correlation degree into the membership degree.In order to achieve the discrimination of the target,when the membership degree is not less than 0.95,it is the real target.The simulation results show that the algorithm can not only realize the recognition of typical targets such as vehicles in multi-intersection mode,but also have certain target type discrimination and vulnerability identification.