Improved RD imaging method suitable for GEOSAR
An imaging method and synthetic aperture technology, which is applied in the field of SAR imaging, can solve the problems of long processing time, high algorithm complexity, and ignoring the impact of imaging quality, etc., and achieve the effect of small amount of calculation
Pending Publication Date: 2022-02-11
SHANGHAI RADIO EQUIP RES INST
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It aims to solve the problems of high algorithm complexity and long processing time in the prior art, and does not consider the influence of high-order phase errors of the target slant range in the long synthetic aperture time on the imaging quality, and the problem of considering the influence of path loss
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[0077] Contraction below Figure 1-3 And DETAILED DESCRIPTION OF THE INVENTION Improved RD imaging methods proposed by the present invention are further described in further detail. The advantages and features of the present invention will be more clear depending on below. It should be noted that the drawings use a very simplified form and use non-precision ratios, only for convenience, and clarity to clarify the purposes of the present invention. In order to make the objects, features, and advantages of the present invention, please refer to the drawings. It should be noted that the structure, proportion, size, etc., which are drawn in the accompanying drawings of this specification, are only used in conjunction with the contents disclosed in the specification, and those who are familiar with this technique are not intended to limit the implementation of the present invention. Condition, so there is no technical substantive significance, any structure of modification, proportional...
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The invention discloses an improved RD imaging method suitable for GEOSAR. The method comprises the steps of obtaining a slope distance error caused by the refraction of an ionized layer according to the space-time change characteristics of a background ionized layer in synthetic aperture time, based on a non-stop-walk-stop hypothesis, acquiring a two-way slope distance error value caused by the ionized layer, acquiring a two-dimensional echo signal expression of the GEOSAR, obtaining a two-dimensional echo signal simplified expression of the GEOSAR by using a series inversion method, treating the ionized layer influence, compensating the influence of a high-order phase function, conducting distance compression and distance migration correction, carrying out azimuth compression processing, and acquiring aclear two-dimensional image of a point target. According to the improved RD imaging method suitable for GEOSAR provided by the invention, the clear imaging of the target can be realized in a large scene range; the method is small in calculation amount and can be conveniently applied to actual engineering.
Description
Technical field [0001] The present invention relates to the field of SAR imaging techniques, and more particularly to an improved RD imaging method suitable for Geosar. Background technique [0002] Geosynchronous Synthetic Aperture Radar, Geosar has the advantages of short and anti-strike capabilities, and has extensive application prospects and development potential in military and civilians. During the transmission of Geosar signals, ionosphere is inevitably affected. For Leosar, the impact of igniting the imaging quality is ignored due to the shorter synthetic aperture time. However, Geosar is generally operated in the L-band, and since the synthetic aperture time is longer, the time variation characteristics of the ionosphere will seriously affect the imaging focus performance of the radar during the hourly magnitude. [0003] Among the imaging methods for Geosar, there is a high complexity of the algorithm. It takes a long processing time, and does not consider the effect o...
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Login to View More IPC IPC(8): G01S13/90G01S7/41
CPCG01S13/9021G01S7/41
Inventor 王卓群李雁斌邵晟唐琳陈曦何启明
Owner SHANGHAI RADIO EQUIP RES INST