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A Three-Stage Accelerometer Self-Calibration Technique for Space-Stable Inertial Navigation Systems.

Qiuping Wu1, Ruonan Wu2, Fengtian Han3

  • 1Department of Precision Instrument, Tsinghua University, Beijing 100084, China. wuqiuping@mail.tsinghua.edu.cn.

Sensors (Basel, Switzerland)
|September 12, 2018
PubMed
Summary
This summary is machine-generated.

A new three-stage accelerometer self-calibration technique improves inertial navigation system (INS) accuracy. This method enhances accelerometer error estimation, leading to significant improvements in navigation performance.

Keywords:
accelerometer calibrationdevice-level calibrationspace-stable INSsystem-level calibration

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Area of Science:

  • Navigation Systems
  • Sensor Technology
  • Calibration Techniques

Background:

  • Tri-axis accelerometers are crucial for inertial navigation systems (INS).
  • Accelerometer measurement errors directly cause navigation errors and affect gyro drift estimation.
  • Calibration is essential for improving accelerometer accuracy.

Purpose of the Study:

  • To propose a novel three-stage accelerometer self-calibration technique for space-stabilized INS.
  • To combine device-level and system-level calibration advantages for enhanced accuracy.
  • To improve the estimation accuracy of accelerometer error parameters.

Main Methods:

  • A three-stage calibration process: coarse device-level, fine device-level, and system-level calibration.
  • Utilizing a space-stabilized platform for precise angulation.
  • Employing specific force and attitude errors for system-level calibration.

Main Results:

  • Achieved accelerometer error estimation accuracy of 1 × 10⁻⁶ g.
  • Improved latitude, longitude, and attitude angle accuracy by over 45%.
  • Enhanced velocity accuracy by over 22% during navigation.

Conclusions:

  • The proposed three-stage calibration technique effectively enhances accelerometer accuracy in space-stable INS.
  • This method significantly reduces navigation errors and improves overall system performance.
  • The technique offers a practical solution for high-accuracy inertial navigation.