By Kai Borre, Dennis M. Akos, Nicolaj Bertelsen, Peter Rinder, Søren Holdt Jensen
This booklet discover using new applied sciences within the zone of satellite tv for pc navigation receivers. so as to construct a reconfigurable receiver with quite a lot of purposes, the authors talk about receiver structure according to software-defined radio thoughts. The presentation unfolds in a basic sort and is going from the fundamentals to state-of-the-art study. The ebook is geared toward utilized mathematicians, electric engineers, geodesists, and graduate scholars. it can be used as a textbook in a variety of GPS know-how and sign processing classes, or as a self-study reference for an individual operating with satellite tv for pc navigation receivers.
Read Online or Download A Software-Defined GPS and Galileo Receiver: A Single-Frequency Approach PDF
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Extra resources for A Software-Defined GPS and Galileo Receiver: A Single-Frequency Approach
Thus, the minimum practical bandwidth for the Galileo L1 OS is 8 MHz. For precise tracking of the code a bandwidth wider than the minimum is generally used. Within this 4 ms period the signal-to-noise ratio (SNR) prevents the downloading of data for signals weaker than 25 dB/Hz. The data-download situation is improved by using forward error correction codes (FEC), and block interleave also covers for burst errors. FEC convolutional codes spread the information from one user data bit over many transmitted symbols.
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. Its ranging codes and navigation data are encrypted. The data signal is L1-B (meaning the B channel within L1) and the data-free signal is L1-C (meaning the C channel within L1). A data-free signal is also called a pilot signal. It is made of a ranging code only, not modulated by a navigation data stream.
To search the very long code lengths proposed for the new signals would be impractical, so the codes have been designed with escape routes. The most common one is called a tiered code. This means it is built in layers so that when you have a strong signal you can acquire on a simple layer, with less time-domain possibilities, only switching to the full-length code when required. The minimum bandwidth is generally twice the chipping rate for simple codes, while for BOC codes it is twice the sum of chipping rate and offset code rate.