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Forward multiple-base line interference type synthetic aperture microwave radiometer and its design method

A technology of microwave radiometer and synthetic aperture, which is applied in the field of remote sensing measurement, can solve the problems that SSR cannot observe the earth, and the number of two-dimensional imaging antenna units and correlators is large, so as to reduce the number of antenna units, reduce the number of baselines, and overcome the problem of measurement The effect of the restriction

Inactive Publication Date: 2004-08-25
NAT SPACE SCI CENT CAS
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Problems solved by technology

[0005] The purpose of the present invention is to solve the problem that ESTAR is used for two-dimensional imaging antenna units and correlators too many and SSR cannot be used for earth observation

Method used

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  • Forward multiple-base line interference type synthetic aperture microwave radiometer and its design method
  • Forward multiple-base line interference type synthetic aperture microwave radiometer and its design method
  • Forward multiple-base line interference type synthetic aperture microwave radiometer and its design method

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Embodiment Construction

[0016] combine figure 1 The workflow of the present invention will be described. Unit 1 is a sparse antenna array, N is the number of antenna units, each antenna unit corresponds to a receiving channel, so N is also the number of receiving channels, 1-1, 2-1, ... N-1 are the antenna units in the sparse antenna array respectively , they have a certain spatial layout according to the baseline combination requirements: 1-2, 2-2, ... N-2 is the calibration / measurement switch of each receiving channel, a coherent / incoherent calibration switch, the switch is in the number tube, control and Under the control of the communication unit, the receiver is switched to the antenna output end, the coherent noise source output end and the incoherent noise source (matching load) inside the switch respectively, so as to realize the calibration and measurement of the measurement signal, coherent noise and incoherent noise respectively. The results of the calibration measurements correct for cha...

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Abstract

The design method of interference type synthetic aperture microwave radiometer solves the problem of two many antenna units and correlators required when ESTAR is used in 2-D imaging and the problem of SSR incapable of being used in earth observation. The sparse antenna array is constituted in different modes, including oscillation scan imaging, phase controlled array oscillating scan imaging and 2-D synthetic aperture imaging. Spatial frequency variance caused by gimbel in forward direction is utilized for spatial frequency conversing and visibility function sampling, and this reduces the number of physical radixes and antenna units required in this direction and is favorable to space application.

Description

technical field [0001] The invention relates to remote sensing measurement technology, in particular to a comprehensive aperture microwave radiometer. Background technique [0002] The usual passive microwave remote sensing measurement method is to directly measure the radiant brightness temperature of ground objects. But the antenna aperture used for direct measurement must be a real antenna aperture, such as a reflector antenna or an array antenna that can generate a real narrow beam. Since the beam width of the antenna (corresponding to the ground resolution) is inversely proportional to the physical aperture of the antenna (the diameter of the antenna aperture), and proportional to the working wavelength of the antenna, in order to improve the spatial resolution of remote sensing images, the working wavelength (frequency) Timing comes at the expense of increasing the physical aperture of the antenna. For example, for a real aperture radiometer operating in the L-band (...

Claims

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Application Information

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IPC IPC(8): G01S13/90
Inventor 吴季董晓龙
Owner NAT SPACE SCI CENT CAS
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