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Related Concept Videos

Instrument Calibration01:12

Instrument Calibration

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Instrument calibration is essential for ensuring that instruments produce accurate and consistent results. It is vital in manufacturing, healthcare, testing laboratories, and scientific research. Calibration processes are specific to each instrument and help enhance data accuracy. Each instrument has a unique calibration process tailored to its design and function to improve data accuracy.
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Accurate calibration of glassware, such as volumetric flasks, pipettes, and burettes, is essential to ensure accurate measurements in the analytical laboratory. Calibration helps maintain consistency across measurements and prevents errors arising from inaccurate volumes.
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Updated: Jan 7, 2026

Calibration of Vector Network Analyzer for Measurements in Radio Frequency Propagation Channels
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Inter-Channel Error Calibration Method for Real-Time DBF-SAR System Based on FPGA.

Yao Meng1,2, Jinsong Qiu1,2, Pei Wang1,2

  • 1Department of Space Microwave Remote Sensing System, Aerospace Information Research Institute, Chinese Academy of Sciences, Beijing 100190, China.

Sensors (Basel, Switzerland)
|December 31, 2025
PubMed
Summary

This study introduces a novel real-time calibration method for Digital Beamforming Synthetic Aperture Radar (DBF-SAR) systems. The approach significantly improves signal-to-noise ratio (SNR) and enhances data processing with low hardware resource usage.

Keywords:
DBF-SARFPGAchannel errorpulse compression

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Area of Science:

  • Spaceborne Synthetic Aperture Radar (SAR) systems
  • Digital Beamforming (DBF) technology

Background:

  • High-resolution wide-swath (HRWS) imaging in SAR requires DBF.
  • Multi-channel DBF-SAR systems face challenges in real-time calibration due to hardware limitations.

Purpose of the Study:

  • To propose a real-time channel error calibration method for DBF-SAR systems.
  • To address the conflict between real-time calibration needs and limited on-board hardware resources.

Main Methods:

  • A real-time channel error calibration method based on Fast Fourier Transform (FFT) pulse compression.
  • A "calibration-operation" dual-mode control with a parameter-persistence architecture.
  • Decoupling high-complexity computations to the system initialization phase for low resource overhead.

Main Results:

  • High-precision compensation for inter-channel amplitude, phase, and time-delay errors.
  • Achieved a 5.93 dB improvement in synthesized signal-to-noise ratio (SNR) in a 4-channel system validation, reaching 44.26 dB.
  • Performance approaches theoretical ideal gain, enhancing coherent integration gain.

Conclusions:

  • Validated the feasibility of on-board, real-time calibration with low resource consumption for DBF-SAR systems.
  • Provides key technical support for the engineering robustness and efficient data processing of next-generation SAR systems.