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 publication does, even if, serve its function good.
Read Online or Download A Software-Defined GPS and Galileo Receiver: A Single-Frequency Approach (Applied and Numerical Harmonic Analysis) PDF
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Additional resources for A Software-Defined GPS and Galileo Receiver: A Single-Frequency Approach (Applied and Numerical Harmonic Analysis)
The P code generation follows the same principles as the C/A code, except that 4 shift registers with 12 cells are used. 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.
If one of the output values of these so-called very early and very late correlators is higher than the punctual correlation, the channel is tracking a side peak and corrective action is taken. According to Nunes & Sousa & Leitão (2004), the ACF for BOC( pn, n) with | is given as p = 1, 2, . . and k = 2 p|τ Tc r (τ ) = (−1)k+1 1 2 p (−k + 2kp + k − p) − (4 p − 2k + 1) |τTc| , for |τ | ≤ Tc , 0, otherwise. 5. For p = 1 this is (−1)k+1 −k 2 + 3k − 1 − (5 − 2k) |τTc| , for |τ | ≤ Tc , r (τ ) = 0, otherwise.
Interleaving, which transmits the symbols in a scrambled sequence, means that a single burst error cannot destroy all the symbols relevant to a single user data bit. The downside is that it adds latency to the message, to allow for the interleaving/de-interleaving process. However, on the Galileo signal with 1 s packets this is not a problem. The 4 ms repetition rate is ideal because there is one symbol per code epoch. When the code is synchronized, we know that we will not hit a data bit edge because these always occur at the start of a code sequence.