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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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Related Experiment Video

Updated: Oct 7, 2025

Split Point Analysis and Uncertainty Quantification of Thermal-Optical Organic/Elemental Carbon Measurements
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Airborne SAR Radiometric Calibration Based on Improved Sliding Window Integral Method.

Lu Li1,2,3, Fengli Zhang1,2,3, Yun Shao1,2,3

  • 1Aerospace Information Research Institute, Chinese Academy of Sciences, Beijing 100101, China.

Sensors (Basel, Switzerland)
|January 11, 2022
PubMed
Summary

This study validates the Xinzhou 60 airborne synthetic aperture radar (SAR) sensor, showing its high-resolution polarimetric data accurately reflects ground features. An improved integral method enhances radiometric calibration accuracy for better remote sensing applications.

Keywords:
Xinzhou 60corner reflectorhigh-resolution SARradiometric calibrationsliding window

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Area of Science:

  • Remote Sensing
  • Geophysics
  • Radar Technology

Background:

  • High-resolution synthetic aperture radar (SAR) systems present complex target mechanisms and are susceptible to speckle noise.
  • Accurate extraction of point target position and response energy is crucial for reliable calibration of high-resolution SAR data.

Purpose of the Study:

  • To verify the performance of the Xinzhou 60 high-resolution fully polarimetric SAR sensor.
  • To develop and validate a precise calibration method for high-resolution SAR data.

Main Methods:

  • Utilized corner reflectors for calibrating acquired data from the Xinzhou 60 remote-sensing aircraft.
  • Introduced image context information and proposed a sliding window-based integral method to precisely determine corner reflector integration regions.
  • Compared the integral method with the peak method for target response extraction.

Main Results:

  • The Xinzhou 60 fully polarimetric SAR sensor accurately reflects radiometric characteristics of ground features.
  • The integral method yielded more stable results than the peak method.
  • The sliding window approach improved point target position accuracy, and extracted response energy was closer to theoretical values, indicating higher radiometric calibration accuracy.
  • Cross-validation showed airborne SAR images possess quality comparable to Sentinel-1A and Gaofen-3.

Conclusions:

  • The Xinzhou 60 airborne SAR system achieves high radiometric calibration accuracy.
  • The proposed integral method with sliding windows is effective for precise calibration of high-resolution SAR data.
  • Airborne SAR data quality is competitive with established satellite-based SAR systems.