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公开(公告)号：EP3311449A4
公开(公告)日：2018-05-23
申请号：EP16844829
申请日：2016-06-15
CPC分类号： H01Q21/064 , H01Q5/42 , H01Q13/18 , H01Q21/005 , H01Q21/30
摘要： A planar phased array antenna assembly includes a first face sheet with a first plurality of radiating slots for a first frequency band and a second plurality of radiating slots for a second frequency band, a second face sheet, a third face sheet, and a structure interposed between the first and second face sheets with a third plurality of radiating elements at the first frequency band and a fourth plurality of radiating elements at the second frequency band, and a first feed network for the third plurality of radiating elements and a second feed network for the fourth plurality of radiating elements, and the second face sheet interposed between the structure and the third face sheet. The planar phased array antenna assembly may form part of a synthetic aperture radar (SAR) antenna.
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公开(公告)号：EP3177941A4
公开(公告)日：2018-04-25
申请号：EP15829734
申请日：2015-08-05
申请人： URTHECAST CORP
发明人： FOX PETER ALLEN
CPC分类号： G01S7/025 , G01S7/026 , G01S7/4021 , G01S13/24 , G01S13/9035 , G01S2013/9076
摘要： A quad-pol synthetic aperture radar (SAR) system reduces the effects of range ambiguities in a quad-pol SAR data. Pulses are transmitted in two sub-bands at respective ones of two different linear orientations. For each sub-band and orientation, returns are received in two orientations, and filtered to attenuate the other sub-band. A scattering matrix may be determined from the results. Additionally or alternatively, a Faraday rotation angle associated with acquired quad-pol SAR data is estimated, and used to correct a scatting matrix. Estimation may occur before, after, or both before and after acquisition of the quad-pol SAR data.
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