Geosynchronous orbit synthetic aperture radar (SAR) moving target imaging processing device based on Keystone and time-frequency transformation

Abstract

The invention discloses a geosynchronous orbit synthetic aperture radar (SAR) moving target imaging processing device based on time-frequency transformation and Doppler center correction. The geosynchronous orbit SAR moving target imaging processing device comprises a radar parameter output module, a migration correction and range compression module, a moving target detecting and parameter estimating module and a motion compensation and imaging processing module, wherein the radar parameter output module outputs working parameters of a radar and imaging parameters required for imaging processing; the migration correction and range compression module carries out range migration correction and range compression operation simultaneously on echoes under unknown target motion parameters according to the radar parameters output by the first module; the moving target detecting and parameter estimating module detects a moving target according to the difference between echo time-frequency features of the moving target and a static target, corrects the Doppler center according to frequency spectrum energy and estimates moving parameters; the motion compensation and imaging processing modulecompensates moving signals according to the moving parameters obtained by the third module and carries out azimuth compression to complete imaging.

Description

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AI Technical Summary

Benefits of technology

This patented technology uses two methods - one involves calculating the movement (moving) direction from an object being observed by radar or other sensors while another approach relies solely upon FFT techniques like Time Frequence Analysis (TFA). These technical improvements help enhance image quality and accuracy during surveillance operations such as geospatial imagery.

Problems solved by technology

This patented technical problem addressed in this patents relates to improving the performance and reliability of radioactive telescopic radars that operate near or far fields during flight operations while avoiding interference caused by surrounding buildings and terrain fading effects. Current techniques involve either complex scanning mechanisms like rotational mirror arrays or advanced technology approaches involving different components. However these current solutions have limitations when dealing with fast changes over short distances where the aircraft may move significantly between two points within 30 seconds without changing their orientation.

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