Research on evaluation index of stray light suppression ability of star sensor based on signal-to-noise ratio

Liu, Shi; Zhang, Jierui; Sun, Gaofei; Zhang, Guoyu; Chen, Siwen; Chen, Jiali

doi:10.1016/j.optcom.2022.129175

Cited by 3 publications

(2 citation statements)

References 20 publications

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“…The SNR is an index that describes the relative magnitude of signal energy to noise energy within an image [19]. In star images, the SNR of star points can effectively assess whether the star points can be accurately extracted.…”

Section: Star Image Superposition Algorithm Based On Attitude-related...mentioning

confidence: 99%

A Multimodal Approach for Attitude Measurement of Near-Earth Daytime Star Sensors

He,

Wei

2024

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When star sensors operate under near-Earth daytime conditions, the intense background radiation from the sky severely interferes with the energy of the star points in the imagery, resulting in a low signal-to-noise ratio (SNR) for the star points. This low SNR hinders target extraction and centroid positioning, thereby affecting the normal attitude measurement of star sensors. Addressing the challenge of attitude measurement under daytime conditions, this study first analyzes the mapping relationship of pixel positions in consecutive frames of star sensor imagery. A star image superposition algorithm based on attitude-related frames is proposed. On this foundation, an attitude measurement method based on star image superposition is employed for measuring the attitude of daytime star sensors. Furthermore, a fitting algorithm for the solar centroid is introduced, and a coarse measurement method based on solar position is applied to determine the optical axis orientation of daytime star sensors, enhancing their robustness in daylight conditions. The algorithm proposed in this study is validated through experiments. The results demonstrate that the multimodal attitude measurement method not only effectively improves the SNR of near-Earth daytime star sensor imagery through star image superposition, ensuring the accuracy of attitude measurements, but also ensures the robustness of attitude measurements through solar centroid fitting.

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Section: Star Image Superposition Algorithm Based On Attitude-related...mentioning

confidence: 99%

A Multimodal Approach for Attitude Measurement of Near-Earth Daytime Star Sensors

He,

Wei

2024

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“…And it has the characteristics of high reliability, high precision, low mass, etc [1] . The star sensor obtains the three-axis attitude of the star sensor by calculating the position of the star in the field of view, thereby providing accurate azimuth information for satellites, aircraft, and other carriers [2] . At present, the star sensor has been developed to achieve the attitude measurement accuracy of the angular second order, without the cumulative error of the Inertial navigation system and other problems [3] .…”

Section: Introductionmentioning

confidence: 99%

A detection sensitivity method for star sensor based on star point matching

Han,

Ye,

et al. 2023

Second International Conference on Geographic Information and Remote Sensing Technology (GIRST 2023)

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Real-time on-orbit image quality improvement for a wide-field imaging system with detector arrays

Zhou

Wang

et al. 2023

Opt. Express

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Wide-field imaging systems are faced with the problem of massive image information processing and transmission. Due to the limitation of data bandwidth and other factors, it is difficult for the current technology to process and transmit massive images in real-time. With the requirement for fast response, the demand for real-time on-orbit image processing is increasing. In practice, nonuniformity correction is an important preprocessing step to improve the quality of surveillance images. This paper presents a new real-time on-orbit nonuniform background correction method, which only uses the local pixels of a single row output in real-time, breaking the dependence of the traditional algorithm on the whole image information. Combined with the FPGA pipeline design, when the local pixels of a single row are read out, the processing is completed, and no cache is required at all, which saves the resource overhead in hardware design. It achieves microsecond-level ultra-low latency. The experimental results show that under the influence of strong stray light and strong dark current, our real-time algorithm has a better image quality improvement effect compared with the traditional algorithm. It will greatly help the on-orbit real-time moving target recognition and tracking.

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Research on evaluation index of stray light suppression ability of star sensor based on signal-to-noise ratio

Cited by 3 publications

References 20 publications

A Multimodal Approach for Attitude Measurement of Near-Earth Daytime Star Sensors

A Multimodal Approach for Attitude Measurement of Near-Earth Daytime Star Sensors

A detection sensitivity method for star sensor based on star point matching

Real-time on-orbit image quality improvement for a wide-field imaging system with detector arrays

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