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Mirror image synthetic aperture radiometer

A comprehensive aperture and radiometer technology, applied in the direction of electromagnetic field characteristics, can solve the problems of too many antennas, complex system structure and signal processing, etc., and achieve the effect of low complexity and high spatial resolution

Active Publication Date: 2013-07-24
HUAZHONG UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] Aiming at the defects of the prior art, the object of the present invention is to provide a mirrored synthetic aperture radiometer, aiming to solve the problem that the existing synthetic aperture radiometer has too many antennas and causes complex system structure and signal processing

Method used

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Embodiment 1

[0035] Embodiment 1: One-dimensional mirror synthetic aperture radiometer

[0036] In this embodiment, L antennas form a one-dimensional antenna array, and the one-dimensional antenna array and reflector form a one-dimensional mirror image array, referring to Figure 6 , the antennas in the one-dimensional antenna array are arranged along a straight line, the reflector is perpendicular to the straight line, and the position of the reflector relative to the antenna array is fixed or movable.

[0037] An example of fixed reflector is a one-dimensional mirror array with 6 antennas, see attached Figure 7 , where the distance between adjacent antennas in the antenna array is {2, 3, 1, 1, 1}, the unit is the working wavelength (wavelength for short) of the mirror synthetic aperture radiometer, and the distance between the reflector and the nearest antenna is 1 wavelength .

[0038] An example of reflector movement is a mirrored array with 12 antennas, see appendix Figure 8 , wh...

Embodiment 2

[0040] Embodiment 2: Two-dimensional mirror synthetic aperture radiometer

[0041] In this embodiment, L antennas form a two-dimensional antenna array, and the two-dimensional antenna array forms a two-dimensional mirror image array with one or two reflectors, and the reflectors are fixed or movable. Figure 9 , the antennas in the two-dimensional antenna array are arranged on a plane.

[0042] An example of a reflector is a two-dimensional mirrored array with 13 antennas, see appendix Figure 10 , where 13 antennas are arranged on a plane as a T-shaped antenna array, with 4 antennas per arm, and the distance between adjacent antennas is 1 wavelength. The reflector is perpendicular to the plane where the antenna array is located, and the distance between the reflector and the nearest antenna is The distance is 2 wavelengths.

[0043] An example of two reflectors is a two-dimensional mirrored array with 30 antennas, see attached Figure 11 , where 30 antennas are arranged on...

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Abstract

The invention discloses a mirror image synthetic aperture radiometer which comprises a mirror image array, a receiving channel array, an AD array, a real correlator and a mirror image synthetic aperture processor, wherein the mirror image array is used for receiving microwave radiation of a scene and outputting L paths of signals; the receiving channel array is used for amplifying, filtering and then outputting the L paths of signals respectively, the AD array is used for converting the output of the receiving channel array into L paths of digital signals, the real correlator is used for carrying out real correlation operation on every two of the L paths of digital signals and outputting L(L-1) / 2 paths of digital signals, the mirror image synthetic aperture processor is used for converting the L(L-1) / 2 paths of digital signals to obtain brightness and temperature images of the scene. Reflectors are arranged beside an antenna array to form the mirror image array, the mirror image array is equivalently changed to be a larger antenna array through a mirror image synthetic aperture conversion method, and thus a higher spatial resolution ratio can be obtained with few antennae; and complexity of the system structure and complexity of signal processing are low by utilization of the real correlator.

Description

technical field [0001] The invention belongs to the technical field of microwave remote sensing and detection, and more specifically relates to a mirror image synthetic aperture radiometer. Background technique [0002] The synthetic aperture radiometer uses multiple discrete small antennas to synthesize an equivalent large antenna aperture, which is arranged in a sparse array to reduce the mass and volume of the antenna and improve the spatial resolution of passive microwave remote sensing. However, this advantage is at the cost of system structure and signal processing complexity, especially for large synthetic aperture systems such as spaceborne synthetic aperture radiometers. Due to the large number of antennas, the system structure and signal processing will be very complicated. In addition, the huge Data volume is also an important issue that cannot be ignored. These factors limit the further improvement of system performance. Contents of the invention [0003] Aim...

Claims

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Application Information

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IPC IPC(8): G01R29/08
Inventor 李青侠
Owner HUAZHONG UNIV OF SCI & TECH
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