2015
DOI: 10.1364/ao.54.008417
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Studies on dynamic motion compensation and positioning accuracy on star tracker

Abstract: Error from motion is the dominant restriction on the improvement of dynamic performance on a star tracker. As a remarkable motion error, the degree of nonuniformity of the star image velocity field on the detector is studied, and thus a general model for the moving star spot is built. To minimize velocity nonuniformity, a novel general method is proposed to derive the proper motion compensation and location accuracy in cases of both uniform velocity and acceleration. Using this method, a theoretic analysis on … Show more

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Cited by 20 publications
(3 citation statements)
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“…In [13], the authors added the positional deviation with a nominal standard deviation (σ) of 0.062 pixels and a maximum of 0.31 pixels. In our simulations, we assign a limit of 1.0 pixel as the maximum positional deviation for a star is usually around 1.0 pixel in the space environment according to a recent finding [31]. Geometric distance between the stars is the most affected feature due to the positional deviation of stars.…”
Section: ) Positional Deviation Of Starsmentioning
confidence: 99%
“…In [13], the authors added the positional deviation with a nominal standard deviation (σ) of 0.062 pixels and a maximum of 0.31 pixels. In our simulations, we assign a limit of 1.0 pixel as the maximum positional deviation for a star is usually around 1.0 pixel in the space environment according to a recent finding [31]. Geometric distance between the stars is the most affected feature due to the positional deviation of stars.…”
Section: ) Positional Deviation Of Starsmentioning
confidence: 99%
“…Under dynamic imaging conditions, the star area is dragged and the centroiding error will be unacceptable without any restoration or compensation. Several algorithms have been proposed for star restoration or motion compensation [11,18,19]. However, angular velocity information provided by gyros is indispensable in these algorithms, which complicates the navigation system and blemishes the autonomy of star sensor.…”
Section: Star Restorationmentioning
confidence: 99%
“…The authors of [5] employed a correlation filter to conduct denoising and improve the signal for deblurring star images, considering the angular velocity of the spacecraft to be a constant speed. In addition, the authors of [6] proposed a method to model the PSF of star images and compensate for it under a constant angular velocity and nonfixed angular velocity. Meanwhile, [7] developed a method to simulate multiple blurred star images with uniform and nonuniform blur.…”
Section: Introductionmentioning
confidence: 99%