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Mirror image synthetic aperture radiometer correction method based on external source with known orientation

A comprehensive aperture and correction method technology, applied in radio wave measurement systems, instruments, etc., can solve the problems of microwave radiation imaging quality degradation, complex correction operation, and reduced imaging quality, so as to avoid errors, simplify correction steps, and improve imaging accuracy Effect

Pending Publication Date: 2022-03-15
XIAN INSTITUE OF SPACE RADIO TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] Systematic error will lead to image quality degradation of mirrored synthetic aperture microwave radiation
The existing error correction method requires that the correction point must be at the intersection of the double reflectors, the reflector must be removed when collecting the calibration data, and the reflector must be installed when collecting the observation data, which makes the calibration operation complicated, and repeated installation of the reflector will cause Introduce additional errors and reduce image quality

Method used

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  • Mirror image synthetic aperture radiometer correction method based on external source with known orientation
  • Mirror image synthetic aperture radiometer correction method based on external source with known orientation
  • Mirror image synthetic aperture radiometer correction method based on external source with known orientation

Examples

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Embodiment 1

[0081] Example 1: Brightness temperature image of a point source scene

[0082] In this embodiment, the calibration method of the mirror synthetic aperture radiometer based on the external source with known orientation is simulated and verified, Figure 4 The array used in the simulation is a 24-element rectangular array.

[0083] Specific steps are as follows:

[0084] (1) For a 24-element rectangular array, the mirror synthetic aperture system collects the noise source scene radiation signal;

[0085] (2) Gather the correction data of the external source, and calculate the error of the relevant output of the collected external source;

[0086] (3) The brightness temperature image of the noise source without correction, such as Figure 5 ;

[0087] (4) Correct the noise source signal data with the calculated error of the correlation output of the external source to obtain the corrected noise source brightness temperature image, as shown in Image 6 .

[0088] From the s...

Embodiment 2

[0089] Example 2: The brightness temperature image of the source scene in a stepwise exhibition

[0090] In this embodiment, a simulation verification is carried out for the calibration method of the mirror synthetic aperture radiometer based on an external source with a known orientation.

[0091] Specific steps are as follows:

[0092] (1) For a 24-element rectangular array, the mirror synthetic aperture system collects the noise source scene radiation signal;

[0093] (2) collecting external source correction data, and finding the phase error of the relevant output of the collected external source;

[0094] (3) The brightness temperature image of the stepped source without correction, such as Figure 7 ;

[0095] (4) Use the calculated error of the correlation output of the external source to correct the step spread source signal data to obtain the corrected step spread source brightness temperature image, as shown in Figure 8 .

[0096] From the simulation results, ...

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Abstract

The invention discloses a mirror image synthetic aperture radiometer error correction method based on an external source with known orientation. The method comprises the following steps that a mirror image synthetic aperture system collects a target scene signal; the mirror image synthetic aperture system collects external source signals (namely correction data), and phase error data of all antennas and channels are solved through the collected external source signals; correcting a target scene signal by using the solved phase error data to obtain a corrected related output function; obtaining a cosine visibility function by solving a transfer equation formed by related output functions; and reconstructing a brightness temperature image of the target scene by performing anti-cosine transform on the cosine visibility function. The external source can be placed at any position and can be a noise source or a signal source, correction signals are easy to obtain, channel phase errors can be corrected, and the imaging quality is improved.

Description

technical field [0001] The invention relates to a method for correcting a mirror image synthetic aperture radiometer based on an external source with known orientation, and belongs to the technical field of microwave remote sensing and detection. Background technique [0002] On the premise of not expanding the size of the array, the spatial resolution of the mirrored synthetic aperture is twice that of the conventional synthetic aperture, and a higher spatial resolution is achieved with fewer antenna elements. [0003] The systematic error will lead to the degradation of the imaging quality of the mirror synthetic aperture microwave radiation. The existing error correction method requires that the correction point must be at the intersection of the double reflectors, the reflector must be removed when collecting the calibration data, and the reflector must be installed when collecting the observation data, which makes the calibration operation complicated, and repeated inst...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S7/40
CPCG01S7/40
Inventor 窦昊锋李浩吴袁超李一楠宋广南吕容川姜任之
Owner XIAN INSTITUE OF SPACE RADIO TECH