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MIMO (Multiple-Input Multiple-Output) radar is a new radar system, which can provide more observation channels than traditional array radar with the same number of the array elements. Based on far-field approximation, the usual MIMO array will lead to high azimuth grating lobes in near-field imaging. For designing near-field imaging MIMO array, this paper analyzed the reason of the grating lobes in...
Geosynchronous synthetic aperture radar (SAR) (GEO SAR) has the characteristic of long integration time; thus, the time-freezing model assumption of background ionosphere for traditional low Earth orbit (LEO) SAR no longer holds in GEO SAR. Furthermore, the background ionosphere variation within the integration time cannot be omitted either. In this letter, the variation of total electron content...
The focusing performances of two-step algorithm are analyzed in the paper. The convolution processing in two-step algorithm is detailed analyzed. It can be found that the operation can reduce the Doppler bandwidth effectively and overcome the alias of azimuth echo by making the residual Doppler bandwidth smaller than PRF. The formula of residual Doppler bandwidth is derived here. According to the...
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