Research on signal processing of linear frequency modulated continuous wave laser radar

The linear frequency modulated continuous wave (LFMCW) ladar has some advantages, such as no range blind zone, high range resolution and simple structure. It is particularly suitable for high precision and close target detection, and can be widely used in the laser guidance and fuse. The modulation parameters of a continuously tunable fiber laser produced by U.S. NP Photonics are measured in experiment. It employs a great deal of fiber optic devices, thus, its optical path is simplified, and its heterodyne detection efficiency can be improved. An experiment system of all-fiber LFMCW ladar for ranging and velocity measurement is established, and the signal is processed by using LabVIEW. Its velocity resolution is better than 0.01m/s. The results demonstrate that the experiment system is feasible.