star identification is one of the most important stages in attitude determination with star trackers. this can be performed using matching algorithms between observed stars and a master star catalogue. the main challenge in this approach is to provide a fast and reliable identification algorithm that is sufficiently robust in different pointing views of the star tracker optical system in the sp...

In the star identification algorithms based on the inter-star angular distances, more dimensions of the star patterns are adopted to get high rate of success. However, it spends more time for star identification process. To speed up the star identification process while keeping high rate of success, a new stellate pattern composed of all of the stars in the star image is proposed. So the patter...

In order to enhance the robustness and accelerate the recognition speed of star identification, an autonomous star identification algorithm for star sensors is proposed based on the one-dimensional vector pattern (one_DVP). In the proposed algorithm, the space geometry information of the observed stars is used to form the one-dimensional vector pattern of the observed star. The one-dimensional ...

We show the perception of Canadian French (CF) vowels by Canadian English (CE) listeners and test a cue-weighting hypothesis to explain the attested assimilation patterns. Five CF vowels, /i, y, u, , æ/, and three allophonic variants, [, , ], were examined. The listeners completed a native-language identification task with goodness of fit judgments. We found that most French vowels were ide...

We show the perception of Canadian French (CF) vowels by Canadian English (CE) listeners and test a cue-weighting hypothesis to explain the attested assimilation patterns. Five CF vowels, /i, y, u, , æ/, and three allophonic variants, [, , ], were examined. The listeners completed a native-language identification task with goodness of fit judgments. We found that most French vowels were ide...

Star trackers are currently the most accurate spacecraft attitude sensors. As a result, they are widely used in remote sensing satellites. Since traditional charge-coupled device (CCD)-based star trackers have a limited sensitivity range and dynamic range, the matching process for a star tracker is typically not very sensitive to star brightness. For active pixel sensor (APS) star trackers, the...

A task-independent ller modeling for robust keyphrase detection and veri cation is proposed. Instead of assuming task-speci c lexical knowledge, our model is designed to characterize phrases depending on the speaking-style, thus can be trained with large corpora of di erent but similar tasks. We present two implementations of the portable and general model. The dialogue-style dependent model tr...

In Cartesian coordinate systems, the angular separation-based star identification algorithms involve much trigonometric function computing. That delays the algorithm process. As in a polar coordinate system, the coordinates are denoted by angular values, it is potential to speed up the star identification process by adopting a polar coordinate system. An angular polar coordinate system is intro...