By Kai Borre, Dennis M. Akos, Nicolaj Bertelsen, Peter Rinder, Søren Holdt Jensen
A good written ebook. Excessively concise. an excessive amount of fabric at the RF Front-end, whilst the most expectable concentration often is the base-band. The ebook does, besides the fact that, serve its objective good.
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Extra info for A Software-Defined GPS and Galileo Receiver: A Single-Frequency Approach (Applied and Numerical Harmonic Analysis)
1. Galileo modulation scheme. The scheme is based on the modulation principle coherent adaptive subcarrier modulation (CASM). Now we have information for deﬁning the binary signal components for channels B and C. However, information on channel A is not available. 1, we will describe the Galileo signal L1 OS. The signal component for channel B results from the modulo-2 addition of the navigation data stream d L1−B , the PRN code sequence c L1−B , and the B subcarrier sc L1−B . The ﬁnal component is called e B .
23). In the frequency domain the bandpass signal s(t) is represented by its Fourier transform ∞ S( f ) = −∞ ∞ = = 1 2 = 1 2 s(t)e− j 2π f t dt −∞ ∞ −∞ ∞ −∞ s(t)e j 2π f c t e− j 2π f t dt s(t)e j 2π f c t + s ∗ (t)e− j 2π f c t e− j 2π f t dt s(t)e− j 2π( f − fc )t dt + 1 2 ∞ −∞ s ∗ (t)e− j 2π( f + fc )t dt. 30) In the above derivation we used (v) = 12 (v + v ∗ ). 31) S( f ) = 12 S( f − f c ) + S ∗ (− f − f c ) . 12. 2 GPS Signal In order to design a software-deﬁned single frequency GPS receiver it is necessary to know the characteristics of the signal and data transmitted from the GPS satellites and received by the GPS receiver antenna.
For more details the reader is referred to this document; also note that all information is to be considered preliminary. 1 Signal Theoretical Considerations Today when designing the Galileo signals the situation is very different from the days when the GPS signals were designed. Nowadays applications with difﬁcult signal reception set the speciﬁcations for GNSS; the receiver may be used in the woods or indoors. This puts the most demanding efforts on the signal design. 32 3. Galileo Signal Additionally, the wealth of digital signal processing experience over that time means many hands to the pump.