The Comparison of Bottom Parameter Inversion in Geoacoustic Space and in (P,Q) Space

The acoustical properties of the sea-bottom can be described by geoacoustic (GA) parameters or by reflective parameters: P (phase shift parameter) and Q (absorption parameter). Both in GA space and in (P, Q) space, the parameters are difficult to measure and are instead estimated by inversion methods such as matched field inversion (MFI). In GA space, an assumed model is needed to mount the GA parameters for inverting (model dependent), while the reflective parameters (P, Q) are model-free. In this paper, the efficiency and quality of matched field processing (MFP) in GA space as well as in (P,Q) space are compared and the potential possibility of bottom sound-speed-profile estimation is discussed.