LIDAR SYSTEM USING A SPECTRAL TIME-OF-FLIGHT METHOD AND A LIDAR SIGNAL PROCESSING METHOD

摘要

PURPOSE: A LIDAR system is provided to reduce measurement errors by measuring the absolute distance of a target using the arrival time difference between chirped microwave pulses with different wavelengths.;CONSTITUTION: A LIDAR system using a spectral time of flight method includes a transmission unit(31) which separates a microwave pulse outputted from a laser into two and transmits the separated pulses, a receiving unit(32) which gets a measuring pulse and a reference pulse which are the reflection of the transmitted pulses off a target object and a fixed reference object respectively, a dispersion unit(33) which disperses the received measuring pulse and the received reference pulse, generates a chirped measuring pulse and a chirped reference pulse, and outputs the chirped pulses, a spectrum unit(34) which separates the chirped measuring pulse and the chirped reference pulse by wavelength, generates a spectral measuring pulse and a spectral reference pulse, and outputs the spectral pulses, a detection unit(35) which converts incident pulses, the spectral measuring pulse and the spectral reference pulse, according to a wavelength into electric signals sequentially and obtains a clock rate of each pulse, and an arrival time and a light intensity distribution of each wavelength, a control unit(36) which obtains the absolute distance of the target object(10) by getting the time difference of each wavelength between the measuring pulse and the reference pulse through the clock rate and the arrival time of each wavelength and gets the physical properties of the target object by getting the absorption spectrum of the target object through the light intensity distribution of each wavelength.;COPYRIGHT KIPO 2013;[Reference numerals] (10) Target object; (20) Standard object; (31) Transmission unit; (32) Receiving unit; (33) Dispersion unit; (34) Spectrum unit; (35) Detection unit; (36) Control unit