Acta Photonica Sinica, Volume. 54, Issue 5, 0510001(2025)
Transformer Light-curve Classifier Based Short-term Autonomous Recognition Technology for Asteroid
Figures & Tables(15)
Fig. 1. Process of long-distance autonomous optical navigation of asteroid exploration mission
Fig. 2. Structure of Transformer and Transformer-encoder based light-curve classifier
Fig. 6. The loss and accuracy curve of validation datasets during training
Fig. 7. Lomb-Scargle analysis results of Bennu light-curve observation by OCAMS
Fig. 8. Lomb-Scargle analysis results of Stars light-curve observation by OCAMS
Fig. 9. Transformer classification results of Bennu light-curve observation by OCAMS
Fig. 10. Analysis of point-source motion in approach phase of OSIRIS-REx
Table 1. Optical navigation sensor parameter during simulating
View tableView in ArticleTable 1. Optical navigation sensor parameter during simulating
Parameter name Parameter name Field of view 1.5° Static target sensitivity 20Mag Image resolution 3 840×5 120 Integration time 100 ms
Table 2. Stellar-nostellar classifier hyper-parameter
View tableView in ArticleTable 2. Stellar-nostellar classifier hyper-parameter
Hyper-parameter name Hyper-parameter description Value num_layer Number of transformer encoder layer 2 num_header Number of multi-headed attention heads 1 d_model Internal dimension of transformer embeddings 128 dim_feedforward Dimension of dense feedforward layer 1 024 dropout Dropout applied to transformer encoder layers 0.1 l2_reg L2 weight regularization parameter 1.0 lr Learning rate 0.001 batch_size Training batch size in one step 256 optimizer Training optimizer RAdam activation Activation function relu normalization Normalization method per_sample_minmax finetune_epochs Number of fine tuning epochs 400
Table 3. Stellar-nostellar classifier test result
View tableView in ArticleTable 3. Stellar-nostellar classifier test result
Target type Precision/% Recall/% F1-score Stellar 98.6 95.2 0.968 Asteroid 95.4 98.6 0.970 Mean 97.0 96.9 0.969
Table 4. OSIRIS-REx on-orbit light-curve classification result of Bennu
View tableView in ArticleTable 4. OSIRIS-REx on-orbit light-curve classification result of Bennu
Observe phase Lomb-scargle Our classifier Bennu Full Obs. No-stellar No-stellar Bennu Short Obs. 1 No-stellar No-stellar Bennu Short Obs. 2 Stellar No-Stellar Bennu Short Obs. 3 Stellar No-Stellar Bennu Short Obs. 4 No-stellar No-stellar Bennu Short Obs. 5 No-stellar No-stellar Bennu Short Obs. 6 Stellar No-Stellar Bennu Short Obs. 7 Stellar No-Stellar Bennu Short Obs. 8 Stellar No-Stellar Bennu Short Obs. 9 No-stellar No-stellar Bennu Short Obs. 10 Stellar Stellar Bennu Short Obs. 11 Stellar No-Stellar Bennu Short Obs. 12 No-stellar No-stellar
Table 5. OSIRIS-REx on-orbit light-curve classification result of Star No. 1
View tableView in ArticleTable 5. OSIRIS-REx on-orbit light-curve classification result of Star No. 1
Observe phase Lomb-scargle Our classifier Star No. 1 Full Obs. No-stellar Stellar Star No. 1 Short Obs. 1 Stellar Stellar Star No. 1 Short Obs. 2 Stellar Stellar Star No. 1 Short Obs. 3 No-stellar No-stellar Star No. 1 Short Obs. 4 No-stellar Stellar Star No. 1 Short Obs. 5 Stellar No-Stellar Star No. 1 Short Obs. 6 Stellar Stellar Star No. 1 Short Obs. 7 Stellar Stellar Star No. 1 Short Obs. 8 Stellar Stellar Star No. 1 Short Obs. 9 No-stellar Stellar Star No. 1 Short Obs. 10 Stellar Stellar Star No. 1 Short Obs. 11 Stellar Stellar Star No. 1 Short Obs. 12 No-stellar Stellar
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Kaiyu LEI, Hairui SANG, Xian SHI, Lin LI, Chunhui ZHAO, Yanpeng WU. Transformer Light-curve Classifier Based Short-term Autonomous Recognition Technology for Asteroid[J]. Acta Photonica Sinica, 2025, 54(5): 0510001
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Received: Nov. 19, 2024
Accepted: Jan. 24, 2025
Published Online: Jun. 18, 2025
The Author Email: Yanpeng WU (wuyanpeng@gmail.com)
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