Design Of A Small Phase Modulation Lidar Signal Transceiver System Based On ZYNQ-7000

With the vigorous development of communication technology and optoelectronic technology,the high measurement accuracy and strong anti-interference advantages of Li DAR have made it widely used in military,industrial,vehicular,civilian and other fields.Lidar can more quickly and accurately measure information such as target orientation,distance,and speed.However,Lidar also has its own shortcomings,such as strict requirements for laser equipment and signal processing technology,complex development processes,and high costs.Phase modulated Lidar utilizes the advantages of microwave radar,and through optoelectronics,introduces the processing technology of electrical signals into the signal processing of Lidar through phase modulation.This not only inherits the advantages of Lidar,but also overcomes the disadvantage of demanding external equipment requirements.This article builds a signal transmission and reception system based on the functional requirements and performance indicators of phase modulated Li DAR for signal transmission and reception systems.The main work is as follows:(1)Studied the working principle of phase modulated Lidar,demonstrated the theory of measuring distance using phase modulated Lidar through detailed formula derivation,and provided a design block diagram and performance index analysis of the signal transmission and reception system based on its working principle.In response to the shortcomings of the current radar signal transmission and reception system,such as inflexibility of the signal transmission module,low sampling rate of the signal acquisition module,and weak processing ability for high bandwidth data,based on the concept of software and hardware collaborative design,a structural design using an operating system to drive the operation of components is proposed,in order to fully leverage the advantages of phase bar modulated Lidar.(2)Based on the system design diagram and performance indicators,the selection of devices,system hardware design,and software design were completed.Selecting the ZYNQ-7000 series ARM+FPGA chip as the main control chip,utilizing the software hardware collaboration and programmable peripheral features of the chip,AXI bus is used to achieve logical functional interconnection and expansion between ARM and FPGA.The DA9767 module and AD9226 module were selected to form the signal transmission and reception parts,achieving signal transmission and acquisition functions.Hardware design includes the design and configuration of various functional modules,as well as the creation and application of custom IP cores.The software design includes the porting of Linux system,AXI DMA driver,embedded application and network transmission program development,as well as the development of upper computer control interface,ultimately achieving the overall function of the phase modulation Lidar signal transmission and reception system.(3)Finally,according to the working principle of the phase modulated laser radar,the Functional verification and performance test of the phase modulated laser radar signal receiving and transmitting system are carried out by using a reasonable experimental design.The signal line is used to directly connect the signal transmitting part of the system with the signal receiving part,and the output signal is monitored through the oscilloscope.The results show that the system can achieve basic functions such as custom frequency waveform signal output and reception,as well as upper computer control,in the frequency range of 250 KHz to 15 MHz.The frequency error of the output signal does not exceed 2%,and the received signal is continuous and undistorted.The upper computer control is convenient and simple.