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 signs, reminiscent of these supplied by way of the GPS constellation of satellites. there's an expanding want for a unified open platform that might let more advantageous receiver improvement and layout, in addition to low in cost checking out techniques for numerous functions. This e-book offer hands-on exploration of recent applied sciences during this speedily becoming field.
One of the original gains of the paintings is the interactive method used, giving readers the power to build their very own worldwide Navigation satellite tv for pc platforms (GNSS) receivers. to build this kind of reconfigurable receiver with quite a lot of functions, the authors speak about receiver structure in keeping with software-defined radio (SDR) options. The presentation unfolds in a scientific, common sort and is going from the fundamentals to state-of-the-art research.
Additional positive aspects and themes include:
* Presentation of simple sign constructions utilized in GPS and Galileo, the ecu satellite tv for pc navigation system
* layout and implementation of a GPS sign generator
* Presentation and research of alternative equipment of sign acquisition—serial seek; parallel-frequency area seek; and parallel-code part search—as good as code/carrier monitoring and navigation information decoding
* a whole GPS software program receiver applied utilizing MATLAB code in addition to GPS and GIOVE-A sign records—allowing readers to alter quite a few parameters and instantly see their effects
* MATLAB-based exercises
* A hands-on approach to trying out the fabric lined within the publication: supplementary front-end equipment—which can be bought at http://ccar.colorado.edu/gnss—enables readers engaged on a home windows or LINUX process to generate real-world info by means of changing analog signs to electronic signals
* Supplementary direction fabric for teachers on hand at http://gps.aau.dk/softgps
* Bibliography of modern effects and entire index
The booklet is aimed toward utilized mathematicians, electric engineers, geodesists, and graduate scholars. it can be used as a textbook in numerous GPS expertise and sign processing classes, or as a self-study reference for a person operating with satellite tv for pc navigation receivers.

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Extra resources for A Software-Defined GPS and Galileo Receiver: A Single-Frequency Approach

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A subset of the first 32 codes are assigned to (nominally 24) satellites and recycled when old satellites die and new satellites are launched. Codes 33 through 37 are reserved for other uses, including ground transmitters. 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.

Subframe 1 – Satellite Clock and Health Data The first subframe contains first of all clock information. That is information needed to compute at what time the navigation message is transmitted from the satellite. Additionally, subframe 1 contains health data indicating whether or not the data should be trusted. Subframes 2 and 3 – Satellite Ephemeris Data Subframes 2 and 3 contain the satellite ephemeris data. The ephemeris data relate to the satellite orbit and are needed to compute a satellite position.

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. However, information on channel A is not available. 1, we will describe the Galileo signal L1 OS. The signal component for channel B results from the modulo-2 addition of the navigation data stream d L1−B , the PRN code sequence c L1−B , and the B subcarrier sc L1−B . The final component is called e B . Likewise, the C channel results from the modulo-2 addition of the C channel PRN code sequence c L1−B with the C channel subcarrier sc L1−C .

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