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US 9,851,444 B2Granted
Laser radar device and method of calculating speed of object to be measured
AssigneeMitsubishi Electric Corporation
InventorsNobuki Kotake, Shumpei Kameyama, Masaharu Imaki
Life of this patent
Estimating the term…
Abstract
A speed calculator 16 selects a speed calculation method corresponding to a peak value of an SNR which is detected by a peak SNR detector 15 from among a plurality of speed calculation methods of calculating the speed (wind speed) of an aerosol to calculate the speed (wind speed) of the aerosol according to the speed calculation method. As a result, there is provided an advantage of being able to calculate the speed (wind speed) of the aerosol in a short time with a high degree of accuracy.
Claims6
A laser radar device comprising:
- a laser light transmitter and receiver that emits laser light into atmospheric air, receives laser light which is reflected by an object to be measured existing in the atmospheric air and returns to the laser light transmitter and receiver, and outputs a received signal of said laser light;
- a coherent integrator that performs a coherent integration on the received signal outputted from said laser light transmitter and receiver;
- a spectrum calculator that performs a Fourier transform on the received signal on which the coherent integration is performed by said coherent integrator and performs an incoherent integration on the received signal after the Fourier transform to calculate a spectrum of said received signal;
- a signal to noise ratio calculator that calculates a signal to noise ratio from both the spectrum of the received signal which is calculated by said spectrum calculator, and a spectrum of a noise signal acquired without the received signal and stored in a non-transitory memory of the laser radar device;
- a peak value detector that detects a peak value of the signal to noise ratio calculated by said signal to noise ratio calculator;
- and
- a speed calculator that includes a plurality of speed selection methods of calculating a speed of said object to be measured, and the speed calculator selects one of the plurality of speed calculation methods based on both the peak value of the signal to noise ratio which is detected by said peak value detector and information showing to which one of a calculation rate of the speed and calculation accuracy of the speed a higher priority is given from an external input to the laser radar device, and the speed calculator calculates the speed of said object to be measured according to said speed calculation method.
4 more elements
A method of calculating a speed of an object to be measured, comprising:
- a laser light transmission and reception processing step of a laser light transmitter and receiver emitting laser light into atmospheric air, receiving laser light which is reflected by an object to be measured existing in the atmospheric air and returns to the laser light transmitter and receiver, and outputting a received signal of said laser light;
- a coherent integration processing step of a coherent integrator performing a coherent integration on the received signal outputted in said laser light transmission and reception processing step;
- a spectrum calculation processing step of a spectrum calculator performing a Fourier transform on the received signal on which the coherent integration is performed in said coherent integration processing step and performing an incoherent integration on the received signal after the Fourier transform to calculate a spectrum of said received signal;
- a signal to noise ratio calculation processing step of a signal to noise ratio calculator calculating a signal to noise ratio from both the spectrum of the received signal which is calculated in said spectrum calculation processing step, and a spectrum of a noise signal acquired without the received signal and stored in a non-transitory memory of the laser radar device;
- a peak value detection processing step of a peak value detector detecting a peak value of the signal to noise ratio calculated in said signal to noise ratio calculation processing step;
- and
- a speed calculation processing step of a speed calculator, which includes a plurality of speed calculation methods of calculating a speed of said object to be measured, selecting one of the plurality of speed calculation methods based on both the peak value of the signal to noise ratio which is detected in said peak value detection processing step and information showing to which one of a calculation rate of the speed and calculation accuracy of the speed a higher priority is given from an external input to the laser radar device, and calculating the speed of said object to be measured according to said speed calculation method.
4 more elements
Dependencies are inferred from the claim text.