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Spatial Temporal Analysis of Fieldwise Flow in Microvasculature
09:39

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Published on: November 18, 2019

Satellite angular velocity estimation based on star images and optical flow techniques.

Giancarmine Fasano1, Giancarlo Rufino, Domenico Accardo

  • 1Department of Industrial Engineering (DII), University of Naples "Federico II", P.le Tecchio 80, Naples I80125, Italy. giancarmine.fasano@unina.it.

Sensors (Basel, Switzerland)
|September 28, 2013
PubMed
Summary

This study introduces an optical flow method for estimating spacecraft angular velocity from star images without needing star identification. This technique provides reliable angular rate data, even during tumbling or slewing maneuvers.

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Simultaneous Measurement of Turbulence and Particle Kinematics Using Flow Imaging Techniques
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Published on: March 12, 2019

Area of Science:

  • Aerospace Engineering
  • Astrodynamics
  • Computer Vision

Background:

  • Accurate estimation of spacecraft angular velocity is crucial for attitude control and navigation.
  • Traditional methods often rely on star identification, limiting their use during dynamic maneuvers like de-tumbling or slewing.
  • A need exists for robust angular rate estimation techniques that function independently of attitude determination.

Purpose of the Study:

  • To propose and validate an optical flow-based technique for estimating spacecraft angular velocity using star-field images.
  • To enable angular rate determination even when attitude determination is not feasible.
  • To analyze the theoretical error budget and experimental accuracy of the proposed method.

Main Methods:

  • Utilizing region-based optical flow calculations on preprocessed star images.
  • Applying sensor calibration, the Poisson equation, and a least-squares method for angular velocity vector estimation.
  • Developing a theoretical error budget considering camera parameters and star distribution.

Main Results:

  • The technique successfully estimates spacecraft angular velocity from star-field image sequences.
  • Experimental results align with theoretical error budget predictions.
  • High accuracy is achieved at lower slew rates, with the boresight component being less accurate than others.

Conclusions:

  • The proposed optical flow method offers a viable solution for spacecraft angular velocity estimation, particularly in scenarios where attitude determination is challenging.
  • The technique demonstrates robustness and provides valuable angular rate information during dynamic spacecraft operations.
  • Further analysis indicates specific accuracy characteristics for different components of the angular velocity vector.