| In modern day anti-submarine warfare (ASW), the present methods used to detect long duration tonal signals emitted by subsurface targets (such as LOFAR) are becoming less effective as new submarine technologies emerge. However, there still exists a signal source from submarines that up until recently has not been fully exploited. This signal source is transient in nature and can exist at relatively high source levels which offers long range detection possibilities. If such signals could be detected on an array of sensors, specifically a field of sonobuoys, the difference in arrival times between various sensors can be used to localize the position of the source. This would allow an airborne platform, such as the Canadian CP-140 Aurora long range patrol aircraft, to rapidly proceed to the localized position and deploy additional sensors.;In this thesis, the Morlet Wavelet Transform is applied as a solution to the above stated problem. It is shown to offer good transient signal detection capabilities at low signal to noise ratios and the time delay estimates it provides between pairs of sensors allows accurate localization of the transient signal source. |
