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	2^4	0.0277	10.2933	0.0335	8.6018
	2^5	0.0278	10.2631
	2^6	0.0278	10.2646
	2^7	0.0278	10.2646
	2^8	0.0278	10.2646
	2^9	0.0278	10.2646
	2^10	0.0278	10.2646
Sym4	2^4	0.0353	8.1797
	2^5	0.0333	8.6897
	2^6	0.0330	8.7648
	2^7	0.0330	8.7647
	2^8	0.0330	8.7647
	2^9	0.0330	8.7647
	2^10	0.0330	8.7647
Sym6	2^4	0.0360	8.5351
	2^5	0.0339	8.5929
	2^6	0.0337	8.5968
	2^7	0.0337	8.5968
	2^8	0.0337	8.5968
	2^9	0.0337	8.5968
	2^10	0.0337	8.5968
Sym8	2^4	0.0364	7.9172
	2^5	0.0339	8.5442
	2^6	0.0337	8.6012
	2^7	0.0336	8.6083
	2^8	0.0336	8.6083
	2^9	0.0336	8.6083
	2^10	0.0336	8.6083