Fig. 1. Diagram of localization method flow

Fig. 2. Structure diagram of Φ-OTDR system

Fig. 3. Impact of different SG parameters on signal filtering

Fig. 4. Amplitude signals in space-time domain before and after processing by SG smoothing filtering

Fig. 5. 2D amplitude signal diagrams before and after processing by NLM algorithm

Fig. 6. Comparison of multiple RBS amplitude curves before and after NLM denoising

Fig. 7. Comparison of localization results of 1D signals processed by different methods