Research Article
Discrete Wavelet Transform-based Approach of Real-time Wave Filtering for Dynamic Positioning of Marine Vessels
Table 3
SD and SNR of surge motion for different wavelets and sliding window lengths.
| SymN | Window length | Wavelet filtering | EKF | SD | SNR | SD | SNR |
| Sym2 | 24 | 0.0277 | 10.2933 | 0.0335 | 8.6018 | 25 | 0.0278 | 10.2631 | 26 | 0.0278 | 10.2646 | 27 | 0.0278 | 10.2646 | 28 | 0.0278 | 10.2646 | 29 | 0.0278 | 10.2646 | 210 | 0.0278 | 10.2646 | Sym4 | 24 | 0.0353 | 8.1797 | 25 | 0.0333 | 8.6897 | 26 | 0.0330 | 8.7648 | 27 | 0.0330 | 8.7647 | 28 | 0.0330 | 8.7647 | 29 | 0.0330 | 8.7647 | 210 | 0.0330 | 8.7647 | Sym6 | 24 | 0.0360 | 8.5351 | 25 | 0.0339 | 8.5929 | 26 | 0.0337 | 8.5968 | 27 | 0.0337 | 8.5968 | 28 | 0.0337 | 8.5968 | 29 | 0.0337 | 8.5968 | 210 | 0.0337 | 8.5968 | Sym8 | 24 | 0.0364 | 7.9172 | 25 | 0.0339 | 8.5442 | 26 | 0.0337 | 8.6012 | 27 | 0.0336 | 8.6083 | 28 | 0.0336 | 8.6083 | 29 | 0.0336 | 8.6083 | 210 | 0.0336 | 8.6083 |
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