Page 158 - Acquisition and Processing of Marine Seismic Data

2.6 QC IN DATA ACQUISITION 149

FIG. 2.92 (A) Azimuth angle, (B) depth, and (C) wing angle plots of first six compass birds attached to the fourth streamer
of the spread for each shot along the line.

also increases. QC of the acoustic network should shorter ones. Furthermore, the nodes close to the
be performed online during the acquisition, and rGPS pods, such as those nearby the source
nodes producing erroneous range values are sta- arrays or tail buoys, will provide more reliable
tistically determined and excluded from the net- range data, which makes the mid-net ranges less
work solution computations in real-time. In reliable.
general, crossline nodes are noisier than inline Crossline separation between the streamers is
nodes, and longer ranges contain more error than maintained by streamer steering devices