Self-adaption two-dimensional interpolation method for synthetic aperture radar point target imaging quality assessment

A synthetic aperture radar and two-dimensional interpolation technology, applied in the direction of measuring devices, using re-radiation, radio wave measurement systems, etc., can solve the problem of non-compensation of squint imaging, difficulty in meeting the requirements of angle measurement, and difficulty in applying SAR points with large oblique angles of view Target imaging quality assessment and other issues to achieve the effect of improving accuracy

Inactive Publication Date: 2010-08-18
BEIHANG UNIV
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Problems solved by technology

[0010] 2. In order to calculate the reference distance for squint imaging, it is necessary to obtain accurate squint angles, and the accuracy of existing inertial navigation equipment is difficult to meet the requirements of angle measurement
In addition, since the fixed phase compensation does not affect the imaging quality, from the perspective of reducing the amount of calculation, squint imaging usually does not compensate the phase
[0011] Therefore, the existing two-dimensional interpolation method is difficult to apply to the evaluation of the imaging quality of SAR point targets at large oblique angles of view

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  • Self-adaption two-dimensional interpolation method for synthetic aperture radar point target imaging quality assessment

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[0021] The present invention will be further described in detail in conjunction with the accompanying drawings and experimental simulation.

[0022] The present invention is an adaptive two-dimensional interpolation method for evaluating the imaging quality of a synthetic aperture radar point target, which is to determine the position Q( After X, Y), take the position of Q(X, Y) as the center, extract l rows and r columns to form the data matrix to be interpolated Then perform two-dimensional fast Fourier transform processing on the MA matrix to obtain a two-dimensional spectrum matrix M B . The present invention is to the said M B The matrix performs adaptive two-dimensional interpolation imaging processing, and its specific steps include:

[0023] Step 100: set range interpolation multiple m=16, select azimuth interpolation multiple n;

[0024] Step 100-1: If the oblique angle is zero, execute step 101, and set the azimuth interpolation multiple n=16;

[0025] Step 100...

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Abstract

The invention discloses a self-adaption two-dimensional interpolation method for synthetic aperture radar point target imaging quality assessment, which comprises the following steps: utilizing two-dimensional fast fourier transform to transform a point target imaging result into a two-dimensional frequency domain, adaptively determining interpolation location of each row and each column in a two-dimensional spectrum matrix, and then utilizing two-dimensional fast fourier inverse transform to transform the data after frequency domain zero-padding into a two-dimensional time-domain matrix to obtain an interpolation result. Under the condition that the synthetic aperture radar works at any squint angle, and whether imaging processing compensates the fixed phase introduced by reference distance, the method can correctly carry out interpolation on the point target imaging result, and is helpful to obtain more accurate point target imaging quality assessment.

Description

technical field [0001] The invention relates to an interpolation method for evaluating the imaging quality of synthetic aperture radar. More specifically, it refers to an adaptive two-dimensional interpolation method suitable for imaging quality assessment of synthetic aperture radar point targets. Background technique [0002] Synthetic Aperture Radar (SAR) is not affected by weather and climate, and is currently a remote sensing information acquisition system that has attracted much attention. The SAR system is mainly composed of two parts, the central electronic equipment and the antenna. The central electronic equipment selects the SAR working mode according to the instructions, controls the work of each extension, transmits pulses according to a certain frequency, receives ground echoes, and forms radar echo data. The antenna gains the sending and receiving signals, and realizes the observation of the designated area by adjusting the beam pointing. The direction of m...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S13/90
Inventor 于泽张岩刘敏李春升
Owner BEIHANG UNIV
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