Research On The Range Profile Simulation Generator Of Linear Array Lidar

This paper based on the ranging principle of linear array lidar,a multi-channel precise delay range image simulator is designed to generate multi-channel echo signals of linear array lidar in real-life scenarios.It is convenient for researchers to perform performance tests on line array laser radar indoors,and solves the problem that a large amount of manpower and material resources are consumed in the field experiment in the early stage of linear array lidar design.The system uses the digital delay method and the analog delay method to complete the design of the high-precision delay module.The digital delay method uses the FPGA counter timing method to control the maximum range of the delay system;the analog delay method uses the op amp integration circuit to generate high-precision delay time and control the accuracy of the delay system.The problem of time connection between the digital delay module and the analog delay module is solved,and the cursor-type delay time control is realized.The analog delay compensates for the jitter error caused by the inability of the trigger edge and the clock signal edge to be aligned during the FPGA timing.The system completes the theoretical design and the actual circuit board design.Design experiment for the sample to test the functions of each module of the system and verify the functional integrity of each channel of the simulator.The delay performance of the simulator is tested,and the system error,stability and delay precision of the simulator are measured.The experimental results are analyzed.The accuracy of each channel delay system reaches 0.4 nanoseconds,delay stability and linearity is good,suitable for practical line array lidar use.