On-orbit rapid calibration method for synthetic aperture radar based on natural uniform target

A synthetic aperture radar and calibration technology, which is applied in image data processing, instruments, radio wave measurement systems, etc., can solve the problems of inability to calibrate synthetic aperture radar, and the timeliness of the calibration processing process is poor, so as to reduce manpower and material resources and ensure The effect of precision

Pending Publication Date: 2021-03-05
ACAD OF OPTO ELECTRONICS CHINESE ACAD OF SCI +1
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Problems solved by technology

[0022] The present invention mainly solves the problem that the existing calibration method needs to manually place the RCS reference equipment, the calibration processing flow has poor timeliness, and is limited by the satellite revisit cycle, and cannot quickly calibrate the synthetic aperture radar in an emergency

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  • On-orbit rapid calibration method for synthetic aperture radar based on natural uniform target
  • On-orbit rapid calibration method for synthetic aperture radar based on natural uniform target
  • On-orbit rapid calibration method for synthetic aperture radar based on natural uniform target

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Embodiment Construction

[0049] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be described in further detail below in conjunction with specific embodiments and with reference to the accompanying drawings.

[0050] figure 2 It is a flow chart of a method for on-orbit fast calibration of a synthetic aperture radar based on a natural uniform target according to an embodiment of the present invention, and the method includes the following steps:

[0051] S21, dividing the uncorrected image to be calibrated into cells;

[0052] S22, performing a consistency check on the uncorrected image that needs to be calibrated with the SAR, and eliminating cells in uneven regions;

[0053] Based on parameter N rg and N az The chi-square distribution was used to perform a consistency test on the uncorrected image to remove cells in uneven regions. Calculate the distance-wise pixel value N from the unrectified image rg The number of valu...

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Abstract

The invention relates to an on-orbit rapid calibration method for a synthetic aperture radar based on a natural uniform target. The method comprises the steps of carrying out cell division on an uncorrected image of a synthetic aperture radar needing to be calibrated; removing non-uniform area cells from the uncorrected image; averaging all azimuth strip data of the uncorrected image, fitting a distance strip, solving an antenna gain G, and performing relative correction on the uncorrected image to obtain a relative corrected image; taking the corrected image as a reference image, and registering the two images based on the feature points of the reference image and the uncorrected image; and calculating an absolute calibration parameter solution according to the processed reference image and the relative correction image, and solving an absolute calibration coefficient and an offset coefficient. According to the method, the on-orbit synthetic aperture radar is quickly calibrated basedon the distributed uniform targets in the calibrated synthetic aperture radar reference image and the relative correction image, so that the process of placing artificial reference equipment is omitted, the consumed manpower and material resources are reduced, and the calibration experiment process is accelerated.

Description

technical field [0001] The invention relates to the field of radar calibration, in particular to a synthetic aperture radar on-orbit rapid calibration method based on natural uniform targets. Background technique [0002] Cross-calibration is a method of radiometric calibration, which uses calibrated high-precision satellite data to calibrate uncalibrated satellites. This technology has many related applications in optical remote sensing. The existing Synthetic Aperture Radar (SAR) calibration experiment needs to combine the satellite orbit data to calculate the corresponding calibration reference equipment placement area, and then place the reference equipment in the corresponding area within the corresponding time period. Usually, the calibration The experimental control time is short. At the same time, in the calibration experiment, if the irradiation time is missed, the experimenters need at least one satellite orbit cycle before they can image the reference equipment ...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S7/40G06T7/30
CPCG01S7/40G06T2207/10044G06T7/30
Inventor 易明宽李传荣马灵玲王新鸿汪琪王宁赵永光唐伶俐郑青川
Owner ACAD OF OPTO ELECTRONICS CHINESE ACAD OF SCI
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