高准确度多频调制激光测距算法研究  

High-precision Multi-frequency Modulation Laser Range Finding Algorithm

作　　者：李桂英[1] 陈磊[1] 陈宇[1] 

机构地区：[1]长春理工大学电子信息工程学院,长春130022

出　　处：《光子学报》2011年第12期1888-1892,共5页Acta Photonica Sinica

摘　　要：针对传统的激光测距仪测量准确度低、实时性差等问题,结合正交相位检测和坐标旋转数字式计算机角度解算方法,设计了一种多频激光测距系统.系统中采用改进的正交算法对噪音环境下的测距相位差的正切值进行计算,再通过坐标旋转数字式计算机角度解算方法计算出测距相位差,该方法有效地提高了测距准确度并大大降低了系统的运算量.在采样频率500MHz、计算字长16位、回波信噪比14dB时,测量范围为150m,相位测量误差为0.026 4°,距离测量准确度达到0.11mm.The traditional laser range finder cannot meet the need of real-time and the measurement accuracy.Owing to this,a multi-frequency modulation laser range finder system was designed based on orthogonal calculation and CORDIC phase solver.An improved orthogonal algorithm was used to calculate the tangent of the ranging phase for noisy environments,and the angle was calculated by CORDIC angle solver algorithm.The proposed algorithm effectively improved the range accuracy and greatly reduced the computational.In experiments,the sampling frequency of AD converter is 500 MHz,the SNR is 14 dB,the word length is 16-bits,the measurement range is 150m,the phase difference resolution is better than 0.026 4° and the distance accuracy is better than 0.11 mm.

关 键 词：激光测距 多频调制 正交 坐标旋转数字式计算机 

分 类 号：TN249[电子电信—物理电子学]