By Kai Borre, Dennis M. Akos, Nicolaj Bertelsen, Peter Rinder, Søren Holdt Jensen
A good written publication. Excessively concise. an excessive amount of fabric at the RF Front-end, while the most expectable concentration will be the base-band. The publication does, although, serve its goal good.
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Additional info for A Software-Defined GPS and Galileo Receiver: A Single-Frequency Approach (Applied and Numerical Harmonic Analysis)
3 shows the Gold code C, the navigation data D, the modulo-2 added signal C ⊕ D, and the carrier. The ﬁnal signal is created by binary phase-shift keying (BPSK) where the carrier is instantaneously phase shifted by 180◦ at the time of a chip change. When a navigation data bit transition occurs (about one third from the right edge), the phase of the resulting signal is also phase-shifted 180◦. 20 2. 2. L1 signal structure: f (t) is the carrier wave and C(t) is the discrete C/A code sequence. As seen, this signal repeats itself every ms.
3 Binary Offset Carrier Modulation The Galileo signals and the planned modernized GPS signals inherit improved performance compared to the existing GPS signals. One of the improvements is the introduction of the binary offset carrier (BOC) modulation. BOC modulations offer two independent design parameters – subcarrier frequency f s in MHz, and – spreading code rate fc in Mchip/s. 38 3. 3. Spreading code, subcarrier, carrier, and signal as result of the BOC modulation principle. This ﬁgure does not show the navigation data.
5 seconds; and two registers are combined to produce the X 2 code, which is 15,345,037 chips long. The X 1 and X 2 codes can be combined with 37 different delays on the X 2 code to produce 37 different one-week segments of the P code. Each of the ﬁrst 32 segments is associated with a different satellite. 4 Correlation Properties The Gold codes are selected as spreading sequences for the GPS signals because of their characteristics. The most important characteristics of the C/A codes are their correlation properties.