Research On High-speed Transmission Of Echo Signals In Semi-physical Simulation Of Laser Arrays?

With the rapid development of laser radar technology,laser radar has been widely used in military reconnaissance and civil fields because of its advantages such as strong real-time performance,high resolution,and strong anti-interference.Before the laser radar is put into use,its performance must be verified and evaluated.The laser array hardware-in-the-loop simulation system is an important measure of the performance of the laser radar,and its performance directly affects the accuracy of the entire test.The system simulates laser radar echo imaging by driving and controlling the laser array.The imaging fidelity is closely related to the data transmission rate and the array control accuracy.In view of the shortcomings of poor real-time performance and low precision of existing domestic systems,the echo signal high-speed transmission system designed for this project aims to realize the gigabit data transmission rate and nanosecond drive control accuracy.Based on the study of the design scheme of laser array hardware-in-the-loop simulation system both at home and abroad,the current system is optimized and improved,and a high-speed transmission system for echo signals with high real-time performance and imaging accuracy is designed,and the system hardware and IP core are completed.Design,build a test platform to verify system performance.The main research content is as follows:Firstly,study high-speed serial data transmission technology and applies it to system design,including high-speed serial communication protocol,clock data recovery technology and line coding technology.Analyze and optimize the existing system architecture and complete the overall design of the system.Study the high-speed serial communication interface,bus control interface,and master controller design method and determine the design scheme.Lay the foundation for the system's hardware and logic design.Secondly,study the signal integrity technology and design method of high-speed hardware circuit,and analyze the factors that affect signal stability,such as reflection and crosstalk.The overall architecture of the high-speed hardware circuit is designed.The hardware circuit is divided into three parts: high-speed serial communication interface module,bus interface module,main controller and related circuits.The design ideas,circuit structure and device selection of each part are analyzed in detail.Complete high-speed PCB signal integrity design.Then,the overall architecture of the system IP core is constructed.In the logic design,a top-down modular design method is adopted.The system is divided into three parts: bus control,high-speed serial communication,and drive control.Design the data transmission protocol and verification algorithm for the high-speed serial communication part,study the drive control scheme,and improve the design.Simulate and verify each part of the logic design module IP core to achieve the expected functions of each part.Finally,build the entire system test platform,including the preparation of the upper computer test software.And the function of each part of the system is debugged to ensure that it can work normally.Then the performance of the system's high-speed serial communication interface and the key parts of the drive control are tested respectively,and the performance is evaluated with an embedded logic analyzer.The results show that the system can achieve high data transmission rate and array control accuracy,and can meet the performance requirements of the existing laser array semi-physical simulation system.