Global navigation satellite systems (GNSS) signal processing in urban areas faces a challenge because of multiple access interference (MAI). Sky-view obstruction and surrounding objects result in the reception of GNSS signals with wide range of power. MAI, due to strong signals, generates peaks in the cross-ambiguity function (CAF) that could exceed the peak of a weaker signal being acquired. This could hinder the acquisition process. This article presents a derivation of a closed-form expression for the MAI effect on the CAF. The derived expression aims at explaining the characteristics of the MAI correlation. Furthermore, the derived expression is utilized in developing two interference mitigation algorithms, coherent and noncoherent, called CIM and NCIM, respectively. The detection probability and acquisition performance are evaluated using simulated and real data.
MAI Modeling and Mitigation for GNSS Acquisition in Urban Environments
IEEE Transactions on Aerospace and Electronic Systems ; 58 , 1 ; 541-551
2022-02-01
1165605 byte
Article (Journal)
Electronic Resource
English
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