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Altimetry Method for an Interferometric Radar Altimeter Based on a Phase Quality Evaluation.

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This study introduces a new phase quality evaluation method to reduce angular ambiguity in interferometric radar altimeters (IRAs). This advancement enhances precision and safety for aircraft autonomous functions like landing guidance.

Keywords:
delay/Doppler radar altimeterinterferometric radar altimeterphase comparison monopulse techniquephase quality evaluationsynthetic aperture radarterrain-referenced navigation

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Area of Science:

  • Aerospace Engineering
  • Signal Processing
  • Remote Sensing

Background:

  • Radar altimeters (RA) are crucial for aircraft autonomous functions, including landing guidance and navigation.
  • Interferometric RAs (IRA) offer improved precision by measuring target angles.
  • Current phase-comparison monopulse (PCM) techniques in IRAs face angular ambiguity issues with complex targets like terrain.

Purpose of the Study:

  • To propose a novel altimetry method for IRAs to mitigate angular ambiguity.
  • To enhance the accuracy and safety of aircraft navigation and landing systems.
  • To introduce a phase quality evaluation method for improved azimuth estimation.

Main Methods:

  • The proposed method builds upon synthetic aperture radar (SAR), delay/Doppler radar altimeter, and PCM techniques.
  • A key component is the evaluation of phase quality to resolve ambiguities.
  • The method's effectiveness is assessed through aircraft captive flight tests.

Main Results:

  • The developed phase quality evaluation method effectively reduces angular ambiguity in IRA measurements.
  • Flight test data validates the proposed altimetry approach.
  • The method demonstrates improved performance in estimating target angles, even with multiple reflection points.

Conclusions:

  • The proposed phase quality evaluation method is a significant advancement for interferometric radar altimetry.
  • This technique enhances the reliability of autonomous flight systems by reducing angular ambiguity.
  • The findings pave the way for more precise and safer aircraft operations.