Galileo GIOVE-A acquisition and tracking analysis with a new unambiguous discriminator

This paper focuses on realizing and designing an unambiguous and costeffective algorithm for tracking a Binary Offset Carrier (n,n) signal such asthe BOC(1,1) Galileo signal. The aim of the Galileo receiver design is toacquire and track the E1 band BOC (1, 1) signal broadcast by the prototypeGalileo satellite-GIOVE-A. Results show that it can be successfully acquiredusing a narrowband front end with low sampling rate utilizing conventionalacquisition methods. To eliminate the effect of the ambiguous correlationfunction while maintaining all the features of the BOC (1, 1) spreadspectrum signal, a novel non-coherent code tracking algorithm isintroduced and two architectures of combining Costas loop and DelayLocked Loop (DLL) are proposed. The performances of different DLLdiscriminators are compared. The strength of the novel design lies in its lowcomplexity, high robustness and lack of ambiguity with a relative high slopeof discriminator function which has flexibility of choosing Early/Latespacing liked a conventional Narrow Correlator and possibility ofmaintaining the multipath rejection property