Phase estimation method using digital heterodyne and all phase FFT for improved accuracy of phase shift laser rangefinder

Abstract

In general, the accuracy of a phase-based laser rangefinder is determined by the laser transceiver circuits and the phase estimation method. The higher accuracy of phase estimation is difficult due to harmonics, distortion caused by propagation of light in air, and errors caused by zero crossing. In this paper, we propose a digital heterodyne and phase estimation method by the all phase Fourier transform, which is a key link in improving the accuracy of the phase-shift laser range finder. In this paper, we have presented various scientific and technological problems in applying the phase estimation method by digital heterodyne and the all phase Fourier transform to the phase-shift laser angemeasurement using MATLAB.