Application of Pseudorandom Code to Laser Detector

Abstract

Based on the requirement of improving the detection capability of laser detector, the pseudorandom code may be adopted as the transmitting code of a laser detector. The auto correlation and the anti-jamming characteristics of the pseudorandom code are analyzed at first. Because the emitting power of a laser is reduced greatly where the journey of the pseudorandom code is longer than one, the pseudorandom code should be modulated. On the basis of the foregoing analyses, a new method of pseudorandom code generating and modulating using complex programmable logic device is studied in this paper. The auto correlation characteristic of the modulated pseudorandom code is discussed by simulation method at last. The result shows that the pseudorandom sequence has excellent anti-jamming capability, and the modulated sequence still possesses well the auto correlation characteristic. The theoretic foundation is provided for designing and improving the detecting capability of the laser detector.