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Enhancing Robotic Antenna Measurements with Composite-Plane Range Extension and Localized Sparse Sampling.

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This study introduces a novel robotic antenna measurement system that extends reach and reduces scan time. The enhanced system enables accurate, portable in situ characterization of complex antennas using cost-effective acquisition methods.

Keywords:
antenna testingcomposite-planefast measurementsin situ measurementsnear-fieldportable systemsrange extensionrobotic measurementssingular value decompositionsparse sampling

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Area of Science:

  • Electromagnetics and Antenna Theory
  • Robotics and Automation
  • Measurement Science and Metrology

Background:

  • Robotic antenna measurement systems offer flexibility but face limitations in reach and sampling time.
  • Advanced antenna diagnostics require efficient and accurate measurement techniques.
  • Existing systems struggle with characterizing complex antennas due to physical constraints.

Purpose of the Study:

  • To overcome the reach and sampling time limitations of robotic antenna measurement systems.
  • To enable accurate and portable in situ characterization of complex modern antennas.
  • To develop a cost-effective acquisition system for advanced antenna diagnostics.

Main Methods:

  • A composite-plane range extension technique using an optical tracking system (OTS) for accurate alignment and blending of planar scans.
  • A localized sparse sampling strategy leveraging reduced-order modeling and singular value decomposition (SVD) for accelerated planar near-field (PNF) measurements.
  • Calibration process to mitigate positioning errors during robot repositioning.

Main Results:

  • The combined methodology effectively extends the measurement aperture of the robotic system.
  • Significant reduction in acquisition time for narrow or tilted antenna beams was achieved.
  • Numerical and experimental (X-band) validation confirmed the system's accuracy and efficiency.
  • The system enables accurate in situ characterization of complex antennas.

Conclusions:

  • The proposed system enhances robotic antenna measurements by extending reach and reducing sampling time.
  • This approach facilitates accurate and portable in situ characterization of complex antennas.
  • The developed methodology offers a cost-effective solution for advanced antenna diagnostics.