| CPC G01S 7/4911 (2013.01) [G01S 7/4917 (2013.01); G01S 17/42 (2013.01); G01S 17/931 (2020.01)] | 20 Claims |
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1. A method for processing a laser signal to illuminate and capture an external scene with a laser device, the external scene being sectored in pixels, the method comprising the steps of:
frequency modulating with a first modulating unit a laser signal in up and down-chirps;
polarizing each of the up chirps with a first specific polarization and each of the down chirps with a second specific polarization different to the first polarization;
illuminating with an illuminating unit the external scene with at least a part of the modulated laser signal;
receiving with a receiving unit a reflected laser signal, having up and down received chirps, for each pixel;
simultaneously illuminating the external scene with the up-chirp of the modulated laser signal and with the down-chirp of the modulated laser signal for at least one pixel;
using a part of the reflected up and down chirps signal received within a time frame before an overlapping time (To) when the up and down chirps of the frequency modulated laser signal cross each other, to predict a reflected signal at the overlapping time (To), so as to identify a relevant part of a reflected signal originating from the emitted up-chirp or down-chirp laser signal; and
amplitude modulating with a second modulating unit the frequency modulated laser signal of at least two adjacent pixels, according to at least two different amplitude modulations, so that a calculating unit can distinguish the reflected laser signals of two adjacent pixels on the basis of the two different amplitude modulations, then simultaneously illuminating the external scene with the up-chirp of the modulated laser signal and with the down-chirp of the modulated laser signal for at least one pixel.
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