Download A Software-Defined GPS and Galileo Receiver: A by Kai Borre, Dennis M. Akos, Nicolaj Bertelsen, Peter Rinder, PDF

By Kai Borre, Dennis M. Akos, Nicolaj Bertelsen, Peter Rinder, Søren Holdt Jensen

A good written e-book. Excessively concise. an excessive amount of fabric at the RF Front-end, while the most expectable concentration could be the base-band. The booklet does, despite 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)

Example text

Let the primary code generator work with chip rate R P . The secondary code generator has chip rate R S = R P /N P , where N P is the length in chips of the primary code. In all signal modulations the logical levels 1 and 0 are defined as signal levels −1 and 1 (polar non-return-to-zero representation). 34 3. 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.

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. The following considerations are based on Mattos (2004). 42 MHz. The signal is composed of three channels, called A, B, and C. L1-A is identical to L1 PRS (PRS for public regulated service), which is a restricted access signal.

2 GPS Signal Scheme In the following a detailed description of the signal generation is given. 1 is a block diagram describing the signal generation; see Kaplan & Hegarty (2006), page 124. The block diagram should be read from left to right. At the far left, the main clock signal is supplied to the remaining blocks. 23 MHz. 23 MHz seen from the user on Earth. When multiplied by 154 and 120, it generates the L1 and L2 carrier signals, respectively. At the bottom left corner a limiter is used to stabilize the clock signal before supplying it to the P(Y) and C/A code generators.

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