| 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(f m , x' n ) of the scene, these backscatter data being associated to a plurality of positions x' n , n=0...N-1, N>1, 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 f m , m=0...M-1, M>1, defined by f m =f c -B/2+m·”f, where f c represents the center frequency, B the bandwidth and ”f the frequency step of the sampling. A radar reflectivity image I(± m' , ² n' ) is computed in a pseudo-polar coordinate system based upon the formula: I ± m¹ ² n¹ = ˆ‘ p = 0 P max I p ± m¹ ² n¹ ,
with I p ± m¹ ² n¹ = 1 p ! �¢ - j �¢ 2 �¢ À �¢ ² n¹ f c p �¢ FFT �¢ 2 �¢ D D f m x¹ n �¢ f ^ m �¢ x¹ n p ,
where j represents the imaginary unit, f m = -B/2+m·”f is the baseband frequency, FFT2D denotes the 2D Fast Fourier Transform operator, ± m' , m'=0...M-1, and ² n' , n'=0...N-1 represent a regular grid in the pseudo-polar coordinate system, and P max 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. |
