Results 1 to 10 of about 178,994 (117)

A Dim Space Target Detection and Track Association Method for Dense Stellar Backgrounds [PDF]

Sensors
In space target surveillance missions, effective detection of dim space targets remains a challenge due to dense star interference and the random nature of target motion.
Cheng Jiang, Zhixia Yang, Zhongqi Ma, Chiming Tong, Jinshen Wang   +4 more
doaj   +2 more sources

A Curvature-Based Multidirectional Local Contrast Method for Star Detection of a Star Sensor

Photonics, 2021
Stray light, such as sunlight, moonlight, and earth-atmosphere light, can bring about light spots in backgrounds, and it affects the star detection of star sensors.
Kaili Lu, Enhai Liu, Rujin Zhao, Hui Zhang, Ling Lin, Hong Tian   +5 more
doaj   +1 more source

A Fast Star-Detection Algorithm under Stray-Light Interference

Photonics, 2023
The interference caused by stray light leads to the invalid attitude of star sensors in orbit, thus affecting the attitude control of satellites. In order to overcome this problem, this paper proposes a fast star-detection algorithm with strong stray ...
Kaili Lu, Huakang Li, Ling Lin, Renjie Zhao, Enhai Liu, Rujin Zhao   +5 more
doaj   +1 more source

Fast and robust star detection algorithm based on the dyadic wavelet transform

IET Image Processing, 2023
Star detection is an important part of the spacecraft attitude determination performed by star trackers. The current advanced star detection algorithms can effectively extract star points in complex backgrounds.
Zhanglei Chen, Yong Zheng, Chonghui Li, Yinhu Zhan   +3 more
doaj   +1 more source

Research on the Detection Method of Projection Stellar Target Simulator

Photonics, 2023
The projection stellar target simulator is a stellar target simulator in which star points are projected to be imaged on a fixed plane at a fixed distance.
Jianan Kang, Ru Zheng, Lingyun Wang, Chengwei Pang, Guangxi Li   +4 more
doaj   +1 more source

Design and Simulation of a High-Speed Star Tracker for Direct Optical Feedback Control in ADCS

Sensors, 2020
Star Trackers are often the most accurate instrument in an Attitude Determination and Control Systems, but often present a slow update rate, requiring additional sensor and sensor fusion algorithms to provide a smoother and faster output.
Mikaël Marin, Hyochoong Bang
doaj   +1 more source

Rotational Shearing Interferometer in Detection of the Super-Earth Exoplanets

Applied Sciences, 2022
The astronomers and the general population are fascinated with the problem of exoplanet detection. By far the largest number of detected planets are the so-called Super Earths, relatively cold planets orbiting a large, red giant star, with diameters up ...
Marija Strojnik
doaj   +1 more source

Systems-based approach to examine the cytokine responses in primary mouse lung macrophages infected with low pathogenic avian Influenza virus circulating in South East Asia

BMC Genomics, 2017
Background Influenza A virus (IAV) is a major public health concern, being responsible for the death of approximately half a million people each year.
Biruhalem Taye, Hui Chen, Myint Zu Myaing, Boon Huan Tan, Sebastian Maurer-Stroh, Richard J. Sugrue   +5 more
doaj   +1 more source

Ground Testing Strategies for Verifying the Slew Rate Tolerance of Star Trackers

Sensors, 2014
The performance of a star tracker is largely based on the availability of its attitude solution. Several methods exist to assess star tracker availability under both static and dynamic imaging conditions.
Tom Dzamba, John Enright
doaj   +1 more source

Weak Spatial Target Extraction Based on Small-Field Optical System

Sensors, 2023
Compared to wide-field telescopes, small-field detection systems have higher spatial resolution, resulting in stronger detection capabilities and higher positioning accuracy.
Xuguang Zhang, Yunmeng Liu, Huixian Duan, E Zhang   +3 more
doaj   +1 more source