RADAR-IMAGING OF A SCENE IN THE FAR-FIELD OF A ONE-OR TWO-DIMENSIONAL RADAR ARRAY

摘要

A method of radar-imaging a scene in the far-field of a one-dimensional radar array, comprises providing an array of backscatter data D(fm, x'n) of the scene, these backscatter data being associated to a plurality of positions x'n, n=0...N-1, N1, that are regularly spaced along an axis of the radar array. The backscatter data for each radar array position x'n are sampled in frequency domain, at different frequencies fm, m=0...M-1, M1, defined by fm=fc-B/2+m-Δf, where fc represents the center frequency, B the bandwidth and Δf the frequency step of the sampling. A radar reflectivity image l(αm', βn ') is computed in a pseudo-polar coordinate system based upon the formula (2) with formula (3) where j represents the imaginary unit, formula (A) is the baseband frequency, FFT2D denotes the 2D Fast Fourier Transform operator, αm', m'=0...M-1, and βn', n'=0...N-1 represent a regular grid in the pseudo-polar coordinate system, and Pmax is chosen 0 depending on a predefined accuracy to be achieved. A corresponding method of radar-imaging a scene in the far-field of a two-dimensional radar array is also proposed.