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Space-borne synthetic aperture radar quadruplex-polarization method

A synthetic aperture radar, four-polarization technology, applied in the direction of radio wave reflection/re-radiation, using re-radiation, measuring devices, etc.

Active Publication Date: 2012-07-04
INST OF ELECTRONICS CHINESE ACAD OF SCI
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Problems solved by technology

[0021] The purpose of the present invention is to overcome the problems existing in the prior art, and disclose a four-polarization method for spaceborne synthetic aperture radar, which is based on the combination of polarization time division and linear frequency modulation signal positive and negative frequency modulation slope coding, without increasing the complexity of system equipment In the case of degrees, better distance blur performance is obtained

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Embodiment Construction

[0073] A four-polarization method for spaceborne synthetic aperture radar of the present invention is to propose an improved polarization time division scheme—"polarization time division" and "polarization code division" in consideration of the complexity of system realization, that is, in On the basis of the time-division scheme of SAR alternately transmitting H polarization and V polarization, the positive and negative FM slopes of the chirp signals are encoded at the same time, that is, the chirp signal adopts positive FM slope when transmitting H polarization, and the chirp signal adopts The negative frequency modulation slope further suppresses the distance ambiguity of the polarization time-division working mode.

[0074] A realization method of combining polarization time division with positive and negative slope coding of chirp signal to obtain target four-polarization scattering matrix is ​​proposed.

[0075] 1) The working mode of polarization time division and chirp...

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Abstract

The invention discloses a space-borne synthetic aperture radar quadruplex-polarization method, which relates to the space-borne synthetic aperture radar technology and can simultaneously obtain synthetic aperture radar quadruplex-polarization echo data. On the basis of combination of polarization time division and linear frequency modulation signal positive and negative frequency modulation gradient codes, the space-borne synthetic aperture radar quadruplex-polarization method obtains a good range ambiguity performance under the condition without increasing complexity of system equipment. In addition, a principle of suppressing range ambiguity for the quadruplex-polarization method and a method for calculating space-borne synthetic aperture radar range ambiguity are provided.

Description

technical field [0001] The invention relates to the technical field of space-borne synthetic aperture radar, and is a four-polarization method of space-borne synthetic aperture radar, which can obtain four-polarization echo data of synthetic aperture radar at the same time, that is, based on the method of polarization time division and positive and negative FM slope coding , without increasing the complexity of the system equipment, a better distance ambiguity performance can be obtained. Background technique [0002] The polarization of synthetic aperture radar (SAR) refers to the orientation of the electric field strength when the radar emits and receives electromagnetic waves. Different polarizations lead to different responses of targets to electromagnetic waves. Polarization Synthetic Aperture Radar (POLSAR) records the scattered echoes of ground objects in any polarization state in the form of scattering matrix, which can fully describe the amplitude and phase characte...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S7/41G01S13/90
Inventor 李海英禹卫东
Owner INST OF ELECTRONICS CHINESE ACAD OF SCI
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