Orientation multi-channel intra-pulse bunching SAR imaging method

An imaging method, multi-channel technology, applied in the direction of reflection/re-radiation of radio waves, use of re-radiation, measurement devices, etc., to achieve the effect of receiving beam width

Active Publication Date: 2017-04-26
LEIHUA ELECTRONICS TECH RES INST AVIATION IND OF CHINA
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  • Abstract
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  • Claims
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Problems solved by technology

[0008] The purpose of the present invention is to provide an azimuth multi-channel intrapulse spotlight SAR imaging method to at least solve a technical problem existing in the existing SAR imaging method

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  • Orientation multi-channel intra-pulse bunching SAR imaging method
  • Orientation multi-channel intra-pulse bunching SAR imaging method
  • Orientation multi-channel intra-pulse bunching SAR imaging method

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Embodiment Construction

[0049] In order to make the objectives, technical solutions and advantages of the present invention clearer, the technical solutions in the embodiments of the present invention will be described in more detail below in conjunction with the drawings in the embodiments of the present invention. In the drawings, the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The described embodiments are some, but not all, embodiments of the invention. The embodiments described below by referring to the figures are exemplary and are intended to explain the present invention and should not be construed as limiting the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without creative efforts fall within the protection scope of the present invention. Embodiments of the present invention will be described in detail below ...

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Abstract

The invention relates to the synthetic aperture radar imaging technology field and particularly relates to an orientation multi-channel intra-pulse bunching SAR imaging method. The imaging method comprises steps that a long pulse signal is decomposed into multiple sub pulse signals, and phase modulation is further carried out; the sub pulse signals are emitted to different orientation sub scenes; a full aperture antenna is decomposed in an azimuth into multiple sub aperture antennas for receiving echo signals; APC phase demodulation and separation for the echo signals received by each sub aperture are respectively carried out; residual constant phases in a phase demodulation process are compensated; the sub pulse echo signals after processing are aligned in a distance direction; sub Doppler frequency band synthesis for the sub pulse echo signals after processing is carried out to acquire a main Doppler frequency band; focusing imaging is carried out. The method is advantaged in that all the echos of an irradiated scene can be received, moreover, signal separation is carried out through employing the azimuth spatial domain filtering technology, and performance is not influenced by fluctuation of a ground scene.

Description

technical field [0001] The invention relates to the technical field of synthetic aperture radar imaging, in particular to an azimuth multi-channel intrapulse spotlight SAR imaging method. Background technique [0002] When a synthetic aperture radar (SAR) is mounted on a hypersonic platform (such as a hypersonic aircraft, satellite, etc.), due to the high-speed movement of the platform, the Doppler broadening of the ground scene echo is very serious. In order to satisfy the Nyquist sampling law, ensure The azimuth signal is not ambiguous, and the system needs to use a very high pulse repetition frequency (PRF). A high PRF will lead to a decrease in the length of the sampling window in the range dimension. When the coverage of the radar elevation beam is very wide or a wide scene needs to be imaged, range ambiguity or range blindness will inevitably appear. Therefore, for the hypersonic platform-borne SAR system, the wide mapping zone in the range dimension and the high reso...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S13/90
CPCG01S13/9011
Inventor 吴玉峰刘伟张玮
Owner LEIHUA ELECTRONICS TECH RES INST AVIATION IND OF CHINA
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