A new method for solving directions-of-arrival (DOA) tracking problems is presented. It is based on a practical method for updating invariant subspaces, introduced by G.W. Stewart. This method is O(L(2)), where L is the number of array sensors. One advantage gained by using the invariant subspace updating method is the ability to track rapidly changing DOAs. In addition, it is possible to track sources as they appear or disappear in the incoming data. The results are indistinguishable from those obtained from a full eigendecomposition at every step. [References: 22]
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