Adaptive Absolute Attitude Determination Algorithm for a Fine Guidance Sensor
Abstract
:1. Introduction
2. FGS Image Acquisition
2.1. The Relationship between the NOS and the Attitude Accuracy of an FGS
2.2. The Relationship between the Exposure Time of an FGS and the NOS Detected
2.3. An Adaptive Adjustment Algorithm for the NOS in the FOV of the FGS
3. Absolute Attitude Determination of an FGS
3.1. Multi-Star Centroid Extraction
3.1.1. Star Map Preprocessing
3.1.2. Multi-Connected Domain Segmentation
3.1.3. Centroid Positioning
3.2. Star Identification
3.2.1. Coordinate Transformation
3.2.2. Feature Construction
3.2.3. Matching and Recognition
- The feature vector of the guide star within the FOV is subtracted from the feature vector of the observing star, and a numerical matrix × is obtained.
- The values in the × numerical matrix are judged., marked as 1 if the value is greater than or equal to 0, otherwise marked as 0, and an × label matrix is obtained.
- The AND operation is performed on the elements of each row of the label matrix to obtain an × 1 column vector.
- The guide star feature vector corresponding to element 1 in the × 1 column vector is the matching result. When is large enough, the match is unique.
3.3. QUEST Algorithm
4. Experimental Results
4.1. Results of Adaptive Adjustment Algorithm for the NOS in the FOV
4.2. Absolute Attitude Determination Results
4.3. Absolute Attitude Error Analysis
5. Conclusions
Author Contributions
Funding
Data Availability Statement
Conflicts of Interest
References
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Parameter | Value |
---|---|
Horizontal FOV | |
Vertical FOV | |
Focal length | 1290 mm |
Aperture | 161.25 mm |
Number of horizontal pixels | 2048 |
Number of vertical pixels | 2048 |
Horizontal pixel size | 5.5 m |
Horizontal pixel size | 5.5 m |
Bit depth | 12 bit |
Right Acension | |||||
---|---|---|---|---|---|
Exposure Time (ms) | |||||
Declination | |||||
54 | 26 | 48 | |||
42 | 25 | 50 | |||
31 | 25 | 57 |
Coefficient | Value |
---|---|
987.00 | |
987.00 | |
−63.81 | |
0.84 | |
987.00 | |
218.55 | |
−3.59 | |
−989.00 | |
9.61 | |
29.20 |
Index | LOS Direction | Calculated LOS Direction | ||||
---|---|---|---|---|---|---|
Without Noise | Noise | |||||
Right Ascension () | Declination () | Right Ascension () | Declination () | Right Ascension () | Declination () | |
1 | 43.5 | 6.0 | 43.49999556 | 5.99999317 | 43.49999268 | 5.99999304 |
2 | 43.5 | 6.5 | 43.49999672 | 6.49999114 | 43.49999502 | 6.49999512 |
3 | 43.5 | 7.0 | 43.49999227 | 6.99999580 | 43.49999139 | 6.99999443 |
4 | 44.0 | 6.0 | 44.00000170 | 6.00000418 | 44.00000450 | 6.00000441 |
5 | 44.0 | 6.5 | 44.00000364 | 6.49999940 | 43.99999806 | 6.50000196 |
6 | 44.0 | 7.0 | 44.00000757 | 6.99999761 | 44.00000881 | 6.99999627 |
7 | 44.5 | 6.0 | 44.50000703 | 6.00000327 | 44.50001021 | 6.00000366 |
8 | 44.5 | 6.5 | 44.50000449 | 6.49999810 | 44.50000029 | 6.50000677 |
9 | 44.5 | 7.0 | 44.50000695 | 6.99999882 | 44.50000808 | 6.99999670 |
Index | Error (mas) | |||
---|---|---|---|---|
Without Noise | Noise | |||
Right Ascension | Declination | Right Ascension | Declination | |
1 | −16.0 | −24.6 | −26.4 | −25.1 |
2 | −11.8 | −31.9 | −17.9 | −17.6 |
3 | −27.8 | −15.1 | −31.0 | −20.1 |
4 | 6.1 | 15.0 | 16.2 | 15.9 |
5 | 13.1 | −2.2 | −7.0 | 7.1 |
6 | 27.2 | −8.6 | 31.7 | −13.4 |
7 | 25.3 | 11.8 | 36.8 | 13.2 |
8 | 16.2 | −6.8 | 1.0 | 24.4 |
9 | 25.0 | −4.3 | 29.1 | −11.9 |
Index | RMS (mas) | |
---|---|---|
Right Ascension | Declination | |
1 | 23.5 | 23.7 |
2 | 18.9 | 24.0 |
3 | 30.6 | 20.1 |
4 | 9.0 | 17.8 |
5 | 8.3 | 9.6 |
6 | 30.6 | 14.5 |
7 | 36.7 | 13.3 |
8 | 10.0 | 15.4 |
9 | 30.0 | 12.1 |
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Yang, Y.; Fang, C.; Zhang, Q.; Yin, D. Adaptive Absolute Attitude Determination Algorithm for a Fine Guidance Sensor. Electronics 2023, 12, 3437. https://doi.org/10.3390/electronics12163437
Yang Y, Fang C, Zhang Q, Yin D. Adaptive Absolute Attitude Determination Algorithm for a Fine Guidance Sensor. Electronics. 2023; 12(16):3437. https://doi.org/10.3390/electronics12163437
Chicago/Turabian StyleYang, Yuanyu, Chenyan Fang, Quan Zhang, and Dayi Yin. 2023. "Adaptive Absolute Attitude Determination Algorithm for a Fine Guidance Sensor" Electronics 12, no. 16: 3437. https://doi.org/10.3390/electronics12163437