Title :
Adaptive multifrequency modulation method for an advanced laser range finder
Author :
Kawakami, Tomoteru ; Endo, Michiyuki ; Iwasaki, Takashi
Author_Institution :
Sect. of Light & Radio Waves, Electrotech. Lab., Ibaraki, Japan
fDate :
12/1/1994 12:00:00 AM
Abstract :
The intensity of a laser beam is modulated with radio frequencies (RF), in a laser range finder. The modulated laser beam is directed to a target, and the reflected light is detected. The phase of the RP signal from the detector is measured. A semitransparent obstacle between the laser and the target degrades the accuracy of the range measurement. In this paper, an adaptive multifrequency modulation method is proposed and experimentally verified to overcome this problem
Keywords :
electro-optical modulation; laser ranging; RP signal; adaptive multifrequency modulation; automatic network analyser; laser range finder; modulated laser beam; photodetector; radio frequencies; reflected light; semitransparent obstacle; Degradation; Detectors; Frequency modulation; Intensity modulation; Laser beams; Optical modulation; Phase detection; Phase measurement; Radio frequency; Signal detection;
Journal_Title :
Instrumentation and Measurement, IEEE Transactions on
