By Dabove, Paolo; Manzino, Ambrogio; De Agostino, Mattia
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Additional info for Achievable positioning accuracies in a network of GNSS reference stations
The input to the baseband hardware is the sampled and digitized IF signal with Ni f -bit quantization at a sampling frequency of f s Hz. In order to demodulate the navigation data bits, the baseband module must ﬁrst remove the carrier and the spreading code from the signal (Braasch & van Dierendonck, 1999). The IF samples are mixed with the locally generated carrier in the carrier mixer. The local carrier frequency generator aims to match the frequency of the input signal. Both in phase 36 4 Global Navigation Satellite Systems – Signal, Theory and Applications Will-be-set-by-IN-TECH and quadrature phase signals are generated with Ncar -bit quantization.
2 Performance analyses Summarizing the techniques introduced in the previous sections, there are ﬁve strategies that have to be investigated: non-coherent, CDC, GDC, MGDC and 20-ms coherent combination (full code acquisition). Fig. 8 shows the behavior of the detection probabilities of all the strategies when Tint = 1 ms, Pf a = 10−3 and the signal strength (C/N0 ) varies. The 20-ms coherent technique, as expected, has the best performance. e. GDC, MGDC, CDC, are better than the non-coherent one.
Therefore it is a good practice to keep the operating frequency at least equal to the sampling frequency until the carrier mixing stage and at least equal to four times the subcarrier frequency (or the twice the code frequency in the absence of subcarrier) from the reference signal mixer stage onwards. 6 Complex modulation In the case of AltBOC signals the lines generated within the core correlator portion in Fig. 2 carry complex signals. The local reference mixer LUT must cater for the complex correlation operation.
Achievable positioning accuracies in a network of GNSS reference stations by Dabove, Paolo; Manzino, Ambrogio; De Agostino, Mattia