초록 ▼

A modulated LIDAR system is disclosed, in which a laser for generating an tical carrier signal and a microwave generator for generating a coded microwave signal are provided. A modulator is further provided for modulating the carrier signal with the microwave signal, whereby a modulated signal is ge

A modulated LIDAR system is disclosed, in which a laser for generating an tical carrier signal and a microwave generator for generating a coded microwave signal are provided. A modulator is further provided for modulating the carrier signal with the microwave signal, whereby a modulated signal is generated. A method of detecting a reflective surface is also disclosed, in which an optical carrier signal is generated, the carrier signal is modulated with a coded microwave signal, the modulated signal is reflected off of a reflective surface and the reflected signal is recovered.

대표청구항 ▼

[ We claim:] [1.] A LIDAR system for detecting the presence of and determining the range of an object within a water mass by detecting a reflected signal from the water mass and discriminating the object from continuous backscatter from the water mass, comprising:a pulsed blue-green laser for provid

[ We claim:] [1.] A LIDAR system for detecting the presence of and determining the range of an object within a water mass by detecting a reflected signal from the water mass and discriminating the object from continuous backscatter from the water mass, comprising:a pulsed blue-green laser for providing and transmitting towards the water mass an optical carrier signal which is reflected from the water mass thereby producing the reflected signal;a source of microwave energy for providing a microwave subcarrier signal;a modulator for modulating the optical carrier signal with the microwave subcarrier signal;a photodetector for detecting the reflected signal and producing an electrical signal indicative thereof;a microwave receiver for passively filtering the electrical signal at the modulation frequency of the microwave subcarrier signal and producing a signal indicative of the presence of the object; andmeans for measuring the time delay between when the optical carrier signal is transmitted and when the reflected signal is detected.