Sub-meter strip mode imaging spaceborne synthetic aperture radar system and imaging method thereof

By using a multi-channel azimuth preprocessing module and an equivalent single-channel imaging processing module in the satellite-on-on-mounted synthetic aperture radar system, the N-transmitting and N-receiving function of N-channel is solved, and the problem of difficulty in achieving submeter-level resolution band mode continuous imaging is achieved in traditional systems, and high-resolution band mode continuous imaging is achieved.

CN118859207BActive Publication Date: 2025-03-21JINAN PERCEPTION ORIGIN INFORMATION TECH CO LTD
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Patent Information

Application Number
CN202411159628.6
Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Filing Date
2024-08-22
Publication Date
2025-03-21
Estimated Expiration
2044-08-22

AI Technical Summary

Technical Problem

Traditional single-channel satellite-on-mounted synthetic aperture radar systems are difficult to achieve band mode continuous imaging with submeter resolution, due to the minimum area constraints of the antenna and the distance-oriented imaging width requirements.

Method used

The frequency modulation baseband signal transmitting device, antenna array, multi-channel azimuth preprocessing module and equivalent single-channel synthetic aperture radar imaging processing module are used to realize N transmission and N reception functions through N channels, which is equivalent to N2 single-channel synthetic aperture radars to achieve band mode continuous imaging with submeter-level resolution.

Benefits of technology

The band mode continuous imaging with submeter resolution is realized, solving the problem that traditional systems cannot achieve submeter resolution band mode continuous imaging.

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Abstract

The invention relates to the field of synthetic aperture radar, and discloses a sub-meter strip mode imaging satellite-borne synthetic aperture radar system and an imaging method thereof. The satellite-borne synthetic aperture radar system comprises a frequency modulation baseband signal transmitting device, an antenna array, a multi-channel azimuth preprocessing module and an equivalent single-channel synthetic aperture radar imaging processing module; the frequency modulation baseband signal transmitting device generates multiple intermediate frequency linear frequency modulation baseband digital signals with the same bandwidth when in the transmitting state; the antenna array transmits the multiple intermediate frequency linear frequency modulation baseband digital signals, and receives multiple echo signals at full bandwidth when in the receiving state; the multi-channel azimuth preprocessing module preprocesses the multiple echo signals to obtain signal preprocessing results; the equivalent single-channel synthetic aperture radar imaging processing module processes the signal preprocessing results according to the single-channel imaging algorithm to obtain a synthetic aperture radar high-resolution image. Thus, the satellite-borne synthetic aperture radar system realizes sub-meter strip mode continuous imaging.
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