Geology

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

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

Satellite navigation receivers are used to obtain, technique, and decode space-based navigation indications, comparable to these supplied through the GPS constellation of satellites. there's an expanding want for a unified open platform that may permit better receiver improvement and layout, in addition to reasonably-priced checking out techniques for varied purposes. This ebook offer hands-on exploration of recent applied sciences during this speedily transforming into field.
One of the original positive aspects of the paintings is the interactive method used, giving readers the facility to build their very own international Navigation satellite tv for pc structures (GNSS) receivers. to build one of these reconfigurable receiver with a variety of functions, the authors speak about receiver structure in response to software-defined radio (SDR) innovations. The presentation unfolds in a scientific, easy type and is going from the fundamentals to state-of-the-art research.
Additional positive aspects and issues include:
* Presentation of easy sign constructions utilized in GPS and Galileo, the eu satellite tv for pc navigation system
* layout and implementation of a GPS sign generator
* Presentation and research of alternative tools of sign acquisition—serial seek; parallel-frequency house seek; and parallel-code section search—as good as code/carrier monitoring and navigation information decoding
* an entire GPS software program receiver carried out utilizing MATLAB code in addition to GPS and GIOVE-A sign records—allowing readers to alter numerous parameters and instantly see their effects
* MATLAB-based exercises
* A hands-on approach to trying out the cloth coated within the ebook: supplementary front-end equipment—which should be bought at http://ccar.colorado.edu/gnss—enables readers engaged on a home windows or LINUX procedure to generate real-world information by way of changing analog signs to electronic signals
* Supplementary path fabric for teachers on hand at http://gps.aau.dk/softgps
* Bibliography of contemporary effects and finished index
The publication is geared toward utilized mathematicians, electric engineers, geodesists, and graduate scholars. it can be used as a textbook in a number of GPS know-how and sign processing classes, or as a self-study reference for somebody operating with satellite tv for pc navigation receivers.

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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.

Spreading code, subcarrier, carrier, and signal as result of the BOC modulation principle. This figure does not show the navigation data. These two parameters provide freedom to concentrate signal power within specific parts of the allocated band to reduce interference with the reception of other signals. Furthermore, the redundancy in the upper and lower sidebands of BOC modulations offers practical advantages in receiver processing for signal acquisition, code tracking, carrier tracking, and data demodulation; see Betz (2002).

9 shows a block diagram of a system characterized by a function f and with input signal x(t) and output signal y(t). 17), we can classify systems as follows: Linear and nonlinear systems A system is said to be linear if superposition applies. That is, if y1 (t) = f x 1 (t) and y2 (t) = f x 2 (t) , then a1 y1 (t) + a2 y2 (t) = f a1 x 1 (t) + a2 x 2 (t) . A system in which superposition does not apply is termed a nonlinear system. Time-invariant and time-varying systems A system is said to be be time-invariant if a time shift in the input results in a corresponding time shift in the output.

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