Abstract
Traditional laser ranging system has a poor phase measuring accuracy, low anti-jamming capability and time-consuming measurement. A multi-frequency modulation laser range finder method is proposed in this paper. System uses phase detection algorithm to calculate the sine of ranging phase for noisy environments, and the angle is calculated by Coordinate Rotation Digital Computer(CORDIC) angle solver algorithm. When the sampling frequency is 500MHz, the word length is 16-bits, the SNR is 12dB, the measurement range is 100m, the phase difference resolution is higher than 0.0213°, and the distance accuracy is 0.10mm. Experiments proved that the system can meet the need of high-accuracy and low computational complexity.
Highlights
Laser range finding system is widely used in the areas of nondestructive testing, machine vision and intelligent vehicle cruise, etc [1, 2]
This paper presents a calculation based on the coordinate rotation digital computer angle of the laser phase ranging method
For the complex of detection algorithm, poor real-time performance, low measuring accuracy in laser range finding system, a multi-frequency phase modulate laser ranging method is developed, design a multi-frequency laser range finding system based on FPGA
Summary
Laser range finding system is widely used in the areas of nondestructive testing, machine vision and intelligent vehicle cruise, etc [1, 2]. Multi-frequency laser modulation phase range finding system uses multi-frequency to enlarge the range of ranging and improve measurement accuracy, high frequency, high measurement accuracy; low frequency, large measuring range[3,4,5,6]. This paper presents a calculation based on the coordinate rotation digital computer angle of the laser phase ranging method. Based on FPGA, a multi frequency laser ranging system has been designed, which has simple hardware structure and the advantages of high ranging accuracy and low computation. The CORDIC is using the basic add and shift operations instead of multiplication, using a series of continuous deflections of the fixed angle to approximate the desired rotation angle
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