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A Novel MIMO⁻SAR Solution Based on Azimuth Phase Coding Waveforms and Digital Beamforming.

Fang Zhou1, Jiaqiu Ai2, Zhangyu Dong3

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|October 12, 2018
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Summary
This summary is machine-generated.

A new Azimuth Phase Coding (APC) technique for Multiple-Input Multiple-Output Synthetic Aperture Radar (MIMO-SAR) enables simultaneous waveform transmission. This method effectively separates echoes using digital beamforming, enhancing MIMO-SAR applications and spatial diversity.

Keywords:
azimuth phase coding (APC)digital beamforming (DBF)multiple-input multiple-output synthetic aperture radar (MIMO–SAR)orthogonal waveformsradar system

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Area of Science:

  • * Remote Sensing
  • * Signal Processing
  • * Electrical Engineering

Background:

  • * Separating multiple transmitted waveforms in Multiple-Input Multiple-Output Synthetic Aperture Radar (MIMO-SAR) is crucial for system performance.
  • * Unseparated signals significantly degrade the effectiveness of most MIMO-SAR applications.

Purpose of the Study:

  • * To introduce a novel Azimuth Phase Coding (APC) technique for MIMO-SAR systems to enable simultaneous transmission of multiple waveforms.
  • * To demonstrate the feasibility and advantages of this APC-MIMO-SAR system for improved signal separation and enhanced spatial diversity.

Main Methods:

  • * Implementation of an Azimuth Phase Coding (APC) technique for simultaneous waveform transmission in MIMO-SAR.
  • * Utilization of Azimuth Digital Beamforming (DBF) to effectively separate superimposed echoes despite aliasing in time and Doppler domains.
  • * Validation through simulated data for both point and distributed targets.

Main Results:

  • * Successful separation of simultaneously transmitted echoes without performance degradation, comparable to orthogonal waveforms.
  • * Demonstration of spatial diversity and the formation of a longer baseline in elevation.
  • * Validation of echo separation and reconstruction accuracy using Azimuth DBF.

Conclusions:

  • * The proposed APC-MIMO-SAR system effectively separates multiple waveforms using Azimuth DBF, overcoming challenges of echo aliasing.
  • * The system offers improved spatial diversity and potential for expanded applications in elevation, such as multibaseline InSAR and 3D SAR imaging.
  • * The APC technique provides a feasible and advantageous solution for MIMO-SAR signal processing.