Fig. 6
From: Holographic detection of AIS real-time signals based on sparse representation
Timestamp detection (a), zero-crossing detection (b), and differential peak detection (c). Error distribution: a The detection results of the zero-crossing method. b The detection results of the differential peak method. Both the x-axes denote the time in milliseconds and the y-axes are the normalized amplitude. c The comparison of the two methods. The x-axis denotes the time in milliseconds and the y-axis is the normalized error