Research On Modeling, Analysis And Design Of Pulsed Laser Ranging System

High-precision distance measurement is essential in modern science and technology,but existing pulsed laser ranging exists problems such as low single-range ranging accuracy and complex accuracy-enhancing algorithms make the real-time accuracy of high-precision distance information insufficient.This paper models and analyzes the factors that affect the accuracy of single ranging from the system level,and designs and optimizes the hardware.Finally,a laser ranging system capable of real-time high-precision distance detection in a dynamic environment was developed.Firstly,the structure and working principle of the laser ranging system are introduced in detail.The factors of degree are analyzed mathematically,and specific design requirements are put forward.Choose the right laser and spot according to design requirements converge the optical structure and model and analyze the delay of the laser emission circuit.The final result is a 5ns pulse width narrow pulse laser with constant delay.Secondly,the influence of each structure in the echo receiving module on the measurement range and accuracy is analyzed.The transmission optical structure can be used to achieve distance measurement in the range of 20cm-150 m.The measurement dynamic range of the low noise fixed gain amplifier circuit can reach 1: 2000,and the AC coupling design formula is derived based on the low frequency noise of the amplifier circuit.At the same time,the time identification circuit is modeled and analyzed,and the current double threshold and voltage pulse width dual channel time identification correction methods are used.The single-time ranging accuracy of the entire system is optimized to within 10 cm.Finally,a signal processing module and integrated power module for data processing are designed,and a dynamic real-time measurement experiment is performed on the car.The signal processing module calibrates the fixed delay of the entire system and performs Kalman filtering.In the framework of the algorithm,dynamic errors in the system operation are corrected.A small car has three laser sensors installed.After the distance from the system,the dynamic fusion accuracy in the speed range of 0-80 km / h is still maintained within 10 cm.