Design And Implementation Of Real-time High-speed Data Acquisition Of Lidar Echo Signals

Laser radar ranging system is an indispensable part of modern detection field.With the rapid development of laser radar ranging technology,the requirements for the measurement accuracy of the laser radar ranging system,the feature quantity requirements of the object to be measured,and the field-level measurement are increasing.Traditional methods for analyzing echo signal information cannot meet requirements in terms of performance,speed,accuracy,and volume.The high-speed data acquisition system has the characteristics that the output signal can be recognized and processed by the computer system and can acquire a large amount of original dynamic information,and meets the needs of the laser radar ranging system.Therefore,this paper proposes a design scheme and implementation method of real-time data acquisition system based on high-speed data acquisition system for miniaturization,low power consumption and low cost laser radar echo signals.Using on-chip system to achieve the data acquisition of laser radar echo signal and communication with host computer.The real-time data acquisition system of laser radar echo signals in this design uses a high-speed data direct acquisition method to obtain the laser radar echo signal combined with the characteristics of short-time laser pulses and puts forward a system-on-chip solution based on the combination of ADC,FPGA and STM32.After selecting the appropriate chip,use Altium Designer software to draw the chip peripheral circuit schematic and system hardware PCB board.Using ADC with high performance-price ratio for analog-to-digital conversion.Using FPGA with high speed,high integration,flexible design to achieve ADC chip function configuration and FIFO-based data transmission and caching,and use Modelsim SE software for simulation.Using low-power,high-performance STM32 program design to achieve system data transmission control and host computer communication.Two sets of experiments are designed to test the system's feasibility,stability,practicality,and measurement accuracy.The system can achieve system design requirements of 500Msps sampling rate,8bit resolution and 2048bit memory depth of data.It also provides a feasible solution for increasing the sampling rate to 1Gsps and increasing the storage depth to 2Gbits.At this point,the purpose of geting short-time pulsed laser radar echo signals on real-time was achieved.