Title:
SARレーダシステム
Document Type and Number:
Japanese Patent JP3878213
Kind Code:
B2
Abstract:
PCT No. PCT/SE96/01164 Sec. 371 Date Mar. 20, 1998 Sec. 102(e) Date Mar. 20, 1998 PCT Filed Sep. 20, 1996 PCT Pub. No. WO97/11387 PCT Pub. Date Mar. 27, 1997A synthetic aperture radar system (SAR) has a wide antenna beam. By using a Local Backprojection SAR Processor the requirment for computational power becomes practical. The SAR radar system is arranged to collect signal amplitudes over segments of the vehicle track, called subapertures, which are so short that the closest points imaged on the ground are in the far-field of said subapertures with respect to a wavelength, charactersitic of the radar signal, then to synthesize, from data obtained over each subaperture, a set of directive radar beams with an angular resolution determined by the subaperture length and the wavelength mentioned and each associated with a given position within the subaperture, to assume a topography for the ground surface, either based upon a topographical map or an assumption, for example that the ground is flat, and finally to compute the radar reflectivity of all ground points forming the image by a summation of the amplitudes for all subapertures at the range and beam direction determined by the platform position and the ground point.
Inventors:
Hellsten, hans
Application Number:
JP51264497A
Publication Date:
February 07, 2007
Filing Date:
September 20, 1996
Export Citation:
Assignee:
Sweden
International Classes:
G01S13/90; G01S7/00
Domestic Patent References:
| JP62502144A | ||||
| JP3501164A | ||||
| JP62501313A | ||||
| JP61100679A | ||||
| JP2210285A | ||||
| JP2210286A |
Attorney, Agent or Firm:
Yasuhiko Takeishi
Noriko Murata
Noriko Murata