High-resolution imaging method for short-range wide-field SAR based on 3D equidistant circle model
An imaging method and high-resolution technology, applied in the field of signal processing, can solve the problems of complex spatial variation characteristics of echoes, lack of analytical description of azimuthal spatial variation characteristics of echoes, difficulty in azimuth equalization processing, etc., and achieve a good focusing effect. Effect
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[0186] figure 2 is the three-dimensional geometric configuration diagram of SAR, the radar platform flies along a fixed route with a height of h at a constant speed v, and the center of the radar beam passes through the center point N of the scene successively 0 (x 0 ,y 0 ,0) and an arbitrary point target N(x,y,0), crossing the time t at the center of the beam c The corresponding beam center distances are r c0 and r c .
[0187] Table 2 System simulation parameters of the scene center
[0188]
[0189] Table 2 shows the system simulation parameters of the scene center used in this illustration example, and the range and azimuth widths of the imaging area are 2.0km and 1.3km respectively, and the theoretical resolution is 1.0m. The target N selected in this example 0 , N 1 , N 2 , N 3 and N 4 The positions on the ground two-dimensional coordinate system are (6856.5, 6856.5) m, (7149.8, 6549.8) m, (6549.8, 7149.8) m, (6149.4, 6149.4) m and (7563.6, 7563.6) m. Amo...
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