Research on Absolute Distance Measurement

Using frequency sweep interference to measure distance, which is an effective new method. In the process of theoretical derivation, this paper is based on the principle of interference of light to establish a functional relationship between distance and phase. In the ranging experiment, an overall ranging experiment system was built, which based on theoretical principles. When collecting experimental signals, it is considered that the experiment is electronic interference rather than optical interference, and the electronic device is used to modulate the signal. In the signal processing, the FFT transform method is used to calculate the ranging distance, and a large number of experimental data are analyzed. The data shows that the experiment is within the error tolerance.