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A Generalized Chirp-Scaling Algorithm for Geosynchronous Orbit SAR Staring Observations.

Caipin Li1,2, Mingyi He3

  • 1School of Electronics and Information, Northwestern Polytechnical University, N 1, Dongxiang Rd, Xi'an 710129, China. licaipin2010@163.com.

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Summary
This summary is machine-generated.

Geosynchronous Orbit Synthetic Aperture Radar (GEO SAR) staring observations are improved with a new algorithm. This method uses a fifth-order slant range model and a two-step process to accurately handle long integration times and remove azimuth aliasing.

Keywords:
fifth-order slant range modegeosynchronous SARimproved chirp-scaling algorithmstaring observation

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Area of Science:

  • Remote Sensing
  • Radar Technology
  • Signal Processing

Background:

  • Geosynchronous Orbit Synthetic Aperture Radar (GEO SAR) enables persistent staring observations of Earth.
  • Conventional algorithms struggle with GEO SAR's ultra-long integration times due to inaccurate slant range models and azimuth aliasing.

Purpose of the Study:

  • To develop an improved chirp-scaling algorithm for GEO SAR staring observations.
  • To address challenges posed by ultra-long integration times and improve imaging accuracy.

Main Methods:

  • Implementation of a fifth-order slant range model, accounting for "stop and go" effects.
  • A two-step processing method to effectively remove azimuth aliasing.
  • Deduction of the 2D spectrum and incorporation of high-order phase coupling compensation.

Main Results:

  • The proposed algorithm accurately handles ultra-long integration times in GEO SAR.
  • Demonstrated validity and accuracy through simulations of an L-band GEO SAR with a 1800s integration time.
  • Successfully removed azimuth aliasing, a key challenge in GEO SAR staring observation.

Conclusions:

  • The improved chirp-scaling algorithm is effective for GEO SAR staring observations.
  • The fifth-order slant range model and azimuth de-aliasing are crucial innovations.
  • This algorithm enhances the capability of GEO SAR for detailed ground target monitoring.