UNDERWATER SUBGLACIAL BOTTOM SEISMIC
The analysis of existing methods for the implementation of marine seismic, consider the possibility of their use in the Arctic region in difficult ice conditions. We propose a method implementation underwater subglacial seismic method involving synthetic apertures for receiving the reflected waves on a seismic streamer length of 500m. This method involves the use of correlation methods for the processing of the received signals. Registration of reflected sound waves in difficult ice conditions is difficult because of the short length streamer reception (up to 500 m) and a high level of noise from breaking some ice and the intrinsic noise of the vessel´s machinery. The proposed method makes it possible to increase the effective length of the aperture to 2.5 km, as well as to highlight the useful signal from the background noise. A separate task is the account of interference from multipath waves from the lower edge of the ice. We suppose to solve it with the assistance of the method of separating signals using synthetic apertures.