ABSTRACT
A novel laser-echo simulator system with high precision and a wide range is presented in this paper. The system, which is used to detect the ranging performance of a pulse-laser rangefinder, adopts Phase-Locked Loop (PLL) frequency multiplier to analog laser echo. By doubling the frequency of a crystal oscillator clock, the simulation system can achieve both high-resolution precision and a wide dynamic range. The laser-echo simulation system gathers impulse signals extraction, precision time delay and echo signal simulation into an integrated whole, the range limitation is overcome more effectively while maintaining high accuracy by adopting PLL in particular. The technical index of the simulation system discussed in this paper is 0.3 m high precision with a range from 50 m to 10 km. The detailed design of each component of the laser-echo simulator is described. The experimental results indicate that the echo simulation accuracy of the system is better than 0.35 m, meeting the ranging detection requirements of laser rangefinder performance.
