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.

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