Dual comb absolute ranging technology is characterized by high-precision, and fast absolute distance measurement. However, the complicated system structure limited its use. In this paper, a free-running dual comb high-precision ranging system is proposed. The ranging precision is improved through software algorithms processing, such as adaptive filtering and cross-ambiguity function. Therefore, the system is simplified a lot. The experiments show that the range precision of 4.8 μm can be achieved when the target distance is about 1 m, laser repetition is about 180 MHz, frequency difference between two combs is about 587 Hz. The work in this paper is meaningful to the field application of the free running dual comb ranging system.
Ning et al. (Thu,) studied this question.