Space time adaptive processing for sonar

In both radar and sonar, in fact in all situations where an array of elements is used, one of the interests is to locate targets both spatially and in terms of velocity. In order to have a good estimate of a target´sbearing and velcity, the signal that is analysed has to be well measured, and well suited for the kind of the analysis made. This thesis is carried out at FOI, Swedish Defence Research Agency. The goal is to implement a fully adaptive spacetime processor and identify the main difficulties and try to explain them. Two different methods for handling the noise and interference covariance matrix are described and evaluated. It turns out that the adaptive processors outperform the conventional way of analysing signals, however to a high computational cot. Still, many improvements are to be done and the main field of interest should be the estimation of the covariance matrix and also the estimation of number of interference sources.