A.P. Melikhova – Post-graduate Student, Peter The Great St. Petersburg Polytechnic University E-mail: antonina_92@list.ru

I.A. Tsikin – Dr.Sc.(Eng.), Professor, Peter The Great St. Petersburg Polytechnic University E-mail: tsikin@mail.spbstu.ru

The optimal decision-making algorithm for GNSS integrity monitoring is synthesized in accordance to the generalized likelihood ratio test under the unknown interference source coordinates. The algorithm is designed to implement Angle-of-Arrival GNSS integrity monitoring method and assumes the likelihood functions for realizations of analyzed processes on elements of the antenna array. The direct algorithm is compared to the «post-processing» algorithm, synthesized using likelihood functions for direction-finding results. Comparison shows direct algorithm significant efficiency in terms of probability-based characteristics compared to the post-processing algorithm. Algorithms computational complexity is investigated in typical practical situation when antenna array with a small number of elements is considered. Besides post-processing algorithm complexity is analyzed either in case when required direction-finding procedure is included in the computational costs or in case when direction finding are already obtained independently to GNSS integrity monitoring procedure. It is shown that in the first situation, the direct algorithm has advantage in terms of computational and hardware costs in comparison with the post-processing algorithm, while in the second situation the post-processing algorithm turns out to be much simpler.

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