Star trackers are ubiquitous spacecraft sensors that typically provide high-accuracy attitude in- formation to the spacecraft’s guidance, navigation, and control (GNC) system. These sensors typ-

Recent frustration in finding low size, weight, power (SWaP), cost, and lead time star trackers has driven an internal research and development effort at Johnson Space Center (JSC) in partnership with Rensselaer Polytechnic Institute (RPI) to develop and demonstrate a commercial off-the-shelf (COTS) camera and COTS computer-based star tracker ...

star-tracker has two basic modes of operation. When it is first activated, it has no i. formation about the satellite’s orientation. This is known as the Lost-in-Space (LIS) mode. Once the orientation has been found, it aids the algorithm in estim. ting the orientation in the subsequ.

A star identification algorithm constructs body-frame vectors from star centroids by using Eq.(3.1) and finds corresponding inertial-frame vectors from a star pattern database that is constructed from a star catalog, such as the Hipparcos catalog [54].

2012年4月1日 · Presented a lost-in-space star identification algorithm for small satellites. Extended and combined images work well in feature extraction for star identification. Group Catalogues work well in catalogue search for star identification. Concept of using multiple “unequal” star trackers is proposed.

Utilizing analog offsets determined on-chip and a more robust thresholding algorithm, the star tracker can recover dynamic range and more effectively suppress noise. Such improvements would extend a star tracker's life or allow the product to be used in more extreme environments, without compromising the hardware heritage.

2020年2月18日 · This paper presents a star-tracking algorithm to determine the accurate global orientation of autonomous platforms such as nano satellites, UAV s, and micro-drones using commercial-off-the-shelf (COTS) mobile devices such as smartphones.

To solve the calibrationless lost-in-space problem, a star tracker must determine its attitude with no a priori knowledge, not even lens parameters such as the field-of-view or distortions. Tetra is based on a directly-addressed hash table data structure, which enables it to identify star patterns with a single database access.

2020年2月18日 · This paper presents a star-tracking algorithm to determine the accurate global orientation of autonomous platforms such as nano satellites, U A V s, and micro-drones using...

2021年3月1日 · An improved triangular-based star identification algorithm for low-cost star trackers is proposed. The overall identification rate is improved when few stars are detected. The proposed algorithm is highly robust to missing stars, and robust towards magnitude noise with an optimised star database.