Satellite-borne ultrahigh-resolution SAR (synthetic aperture radar) system and working method thereof

By using frequency multiplication units and reflective antennas in the satellite-based SAR system, the problem that the existing technology cannot meet the centimeter-level resolution requirements is solved, and processing of ultra-large bandwidth signals and imaging of centimeter-level resolutions is realized.

CN119716858AActive Publication Date: 2025-03-28XIAN INSTITUE OF SPACE RADIO TECH
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Patent Information

Application Number
CN202510213192.2
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2025-02-26
Publication Date
2025-03-28
Estimated Expiration
2045-02-26

AI Technical Summary

Technical Problem

Existing satellite-based SAR systems cannot meet the needs of centimeter-level resolution, especially when the bandwidth exceeds 4GHz, phased array antennas face problems of inconsistent dispersion and beam direction.

Method used

The frequency multiplier unit is used to generate an ultra-large bandwidth signal, and transmit and receive it through the reflective antenna. The large bandwidth echo is decomposed into small and medium bandwidth signals by using a signal processor, a power divider and a filter, and multiple analog-to-digital conversion is completed at the signal processor.

Benefits of technology

It realizes signal processing with bandwidth exceeding 4GHz, meets the needs of centimeter-level resolution, and improves the reliability and efficiency of the system through flexible working modes and efficient signal processing.

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Abstract

The invention discloses a satellite-borne ultrahigh-resolution SAR (Synthetic Aperture Radar) system and a working method thereof. The system comprises a signal processor, a frequency multiplication unit, a receiver, a synthesis network front end, a traveling wave tube amplifier group, an amplitude limiting low noise amplifier, a magic T, a waveguide switch, a circulator, a waveguide load and an umbrella antenna, the system is loaded on an agile satellite platform, and large-angle scanning imaging of a target area is achieved by means of maneuvering of the platform. Various working methods are provided through combination of output signals of different ports of the magic T. The ultra-high resolution imaging system has the advantages that ultra-high resolution imaging superior to centimeter-level resolution is realized, the working mode is flexible, the reliability is good, the system composition is simple, the volume and the weight of the product are reduced through centralized transmitting and receiving, the weight is light, the heat consumption is small, and the engineering development cost and difficulty are reduced.
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