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is a principal scientist at FFI, while Andreas Austeng is a professor at UiO. I am employed at FFI, where I started in 1998 after receiving my degree of Cand. Scient. in Physics from the University of Bergen. The work on the thesis was conducted as a part of my job over the years 2011 -2021, and was funded by FFI's projects on synthetic aperture sonar (SAS). These SAS projects have been run and financed through a collaboration between FFI, Kongsberg Maritime and the Royal Norwegian Navy. This thesis includes a collection of five papers, placed and presented in a larger common perspective. I first place the title topic of "Advanced SAS" in a greater context. Then I present each of the individual papers, and give an updated review on their topics. I follow up with a discussion on my contributions in a greater perspective, before I summarize my findings and conclude.

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