Implementation of enhanced differential polarization modulation ranging algorithm
Aiming at problem of low resolution and slow frequency sweeping speed while polarization modulation ranging system directly measuring light intensity minima,a polarization ranging algorithm based on the enhanced differentiation is proposed.Firstly,the influence of frequency measurement on distance measurement precision based on ranging principle is analyzed.Then,an enhanced differential algorithm using the symmetry characteristics of sampling signals is proposed.The principle,steps,and key parameters of this algorithm are analyzed to obtain an optimal parameter combination range.Finally,a polarization modulation ranging system is constructed to verify these parameter combinations.Comparative experiments on ranging precision and speed with a fitted differential method are also conducted.Experimental results indicate that compared with the fitting differential method,the proposed method improves ranging repeatability from 58 μm to 6.8 μm.Average absolute ranging precision is improved to 0.207 mm,and the number of sweeping steps is reduced from 1 100 to 250,measurement time is reduced to 2 s,both precision and speed are significantly enhanced.
NETL
NSTL
万方数据
维普
