A kind of SAR imaging method and system

An imaging method and azimuth technology, applied in radio wave measurement systems, instruments, measuring devices, etc., can solve problems affecting imaging effects, low algorithm calculation accuracy, and real-time performance, so as to simplify processing time and improve computing efficiency , Improving the effect of imaging accuracy
CN110542900BActive Publication Date: 2021-06-15NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
Publication Date
2021-06-15

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Abstract

The invention discloses a SAR imaging method and system. The method includes: receiving SAR echo data and radar parameter data sent by a host computer; calculating radar parameters required for imaging; resampling the SAR echo data by using a polar coordinate format algorithm; resampling the resampled data Perform two-dimensional fast Fourier transform to obtain the initial image of the synthetic aperture radar; use the phase gradient self-focusing algorithm to estimate the phase error of the initial image of the synthetic aperture radar to obtain the one-dimensional azimuth phase error; use the SINC interpolation algorithm to calculate the one-dimensional azimuth phase The error is interpolated to obtain the two-dimensional phase error; the resampled data is multiplied by the two-dimensional phase error to obtain the compensated SAR data; the two-dimensional fast Fourier transform is performed on the compensated SAR data Inverse transform to get the synthetic aperture radar image. The invention can realize fast real-time imaging of SAR, and improves computing efficiency and imaging accuracy.
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Description

technical field

[0001] The invention relates to the technical field of radar imaging, in particular to a SAR imaging method and system. Background technique

[0002] Synthetic Aperture Radar (SAR) uses the movement of a single antenna element to correlate and synthesize the acquired echo signals to form a complete array, and uses signal processing technology to perform high-resolution imaging of scene targets. Different from traditional optical imaging and infrared remote sensing, SAR can work normally without being affected by complex meteorological conditions and extraordinary time periods, and has the characteristics of high resolution and large width. Initially, SAR was mainly used on airborne, spaceborne, and missile-borne platforms. With the development of small unmanned aerial vehicles, it has gradually become a research hotspot to carry micro-SAR imaging systems on them.

[0003] The SAR imaging algorithm is complex, and the amount of data processing is large. In or...

Claims

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