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Unambiguous Forward-Looking SAR Imaging on HSV-R Using Frequency Diverse Array.

Mengdi Zhang1, Guisheng Liao1, Xiongpeng He1

  • 1National Lab of Radar Signal Processing, Xidian University, Xi'an 710071, China.

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|February 26, 2020
PubMed
Summary
This summary is machine-generated.

This study introduces a novel Frequency Diverse Array (FDA) approach to resolve range and left-right ambiguities in hypersonic vehicle (HSV) radar imaging. The method enables clear, wide-swath forward-looking synthetic aperture radar (SAR) images.

Keywords:
forward-looking imagingfrequency diverse array (FDA), range ambiguityleft–right ambiguitysynthetic aperture radar (SAR)

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Area of Science:

  • Radar Systems Engineering
  • Signal Processing
  • Electromagnetics

Background:

  • Hypersonic vehicle (HSV) radar faces challenges in wide swath imaging due to conflicting Doppler and range ambiguities.
  • Forward-looking synthetic aperture radar (SAR) systems specifically encounter left-right ambiguity, complicating target identification.

Purpose of the Study:

  • To propose and validate a Frequency Diverse Array (FDA) based method for resolving range and left-right ambiguities in HSV radar.
  • To enable unambiguous wide swath imaging for forward-looking SAR applications.

Main Methods:

  • Utilizing the range-angle-dependent property of FDA's transmit steering vector to differentiate range ambiguous echoes in the spatial frequency domain.
  • Implementing transmit beamforming post-range compensation to isolate desired range region echoes.
  • Applying the back projection (BP) algorithm for image formation and employing dual receive beamformers (left/right) for final image separation.

Main Results:

  • The proposed FDA approach effectively distinguishes and resolves range and left-right ambiguities.
  • Unambiguous wide swath images were successfully generated, as confirmed by simulation results.
  • The method allows for clear imaging in forward-looking SAR scenarios.

Conclusions:

  • The Frequency Diverse Array (FDA) offers a viable solution to critical ambiguity issues in hypersonic vehicle radar imaging.
  • This technique enhances the capability of SAR systems for clear, wide-swath, forward-looking applications.
  • Simulation outcomes validate the practical effectiveness of the proposed ambiguity resolution strategy.