Method and device for scanning distance and velocity determination

A method for scanning distance and velocity determination of at least one object, said method comprising the steps of:

• emitting, using a light source, an optical signal with a time-varying frequency;
• determining a first difference frequency distribution which is formed by a set of first difference frequencies, wherein the first difference frequencies are associated with different pixels on the at least one object, and wherein each first difference frequency denotes a difference between a frequency of a measurement signal, which originated from the optical signal and was reflected at a respective pixel, and a frequency of a reference signal that has not been reflected at the object;
• determining, at a later time, a second difference frequency distribution which is formed by a set of second difference frequencies, wherein the second difference frequencies are associated to different pixels on the at least one object, and wherein each second difference frequency denotes a difference between the frequency of the measurement signal and the frequency of the reference signal;
• aligning the first difference frequency distribution and the second difference frequency distribution by performing a transformation of the pixels of the first difference frequency distribution and/or of the pixels of the second difference frequency distribution in such a way that after this alignment, pixels corresponding to each other in the first difference frequency distribution and in the second difference frequency distributions correspond to the same object point, wherein performing the transformation comprises coregistering between the first difference frequency distribution and the second difference frequency distribution;
• and
• determining the distance and velocity for each pixel on the at least one object using the two aligned difference frequency distributions.