Author:
Liu Yi,Xu Xinke,He Zecong,Jin Chenkai,Hu Shengpan
Abstract
The laser swept-frequency interferometric
ranging method is commonly used in the field of large-scale,
high-precision, and non-cooperative measurements. However, this method
requires the laser chirp curve to be a stable straight line.
Nonlinearities in the chirp can cause broadening of the target
spectrum, which affects the accuracy of the frequency extraction of
the beat signal, resulting in increased ranging error. Herein, a
linear regression laser swept-frequency interferometry method based on
the non-uniform fast Fourier transform is proposed, which effectively
suppresses the influence of frequency modulation nonlinearity on
ranging accuracy.
Funder
Natural Science Foundation of Zhejiang Province
Subject
Atomic and Molecular Physics, and Optics,Engineering (miscellaneous),Electrical and Electronic Engineering