By Kai Borre, Dennis M. Akos, Nicolaj Bertelsen, Peter Rinder, Søren Holdt Jensen
Satellite navigation receivers are used to obtain, procedure, and decode space-based navigation signs, similar to these supplied via the GPS constellation of satellites. there's an expanding want for a unified open platform that might let more suitable receiver improvement and layout, in addition to affordable checking out techniques for numerous functions. This e-book offer hands-on exploration of latest applied sciences during this speedily becoming field.
One of the original beneficial properties of the paintings is the interactive technique used, giving readers the facility to build their very own worldwide Navigation satellite tv for pc structures (GNSS) receivers. to build any such reconfigurable receiver with a variety of purposes, the authors talk about receiver structure according to software-defined radio (SDR) innovations. The presentation unfolds in a scientific, trouble-free variety and is going from the fundamentals to state-of-the-art research.
Additional positive factors and themes 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 area seek; and parallel-code part search—as good as code/carrier monitoring and navigation info 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 a number of parameters and instantly see their effects
* MATLAB-based exercises
* A hands-on approach to checking out the cloth coated within the ebook: supplementary front-end equipment—which will be bought at http://ccar.colorado.edu/gnss—enables readers engaged on a home windows or LINUX approach to generate real-world information via changing analog indications to electronic signals
* Supplementary path fabric for teachers to be had at http://gps.aau.dk/softgps
* Bibliography of contemporary effects and accomplished index
The ebook is aimed toward utilized mathematicians, electric engineers, geodesists, and graduate scholars. it can be used as a textbook in quite a few GPS expertise and sign processing classes, or as a self-study reference for an individual operating with satellite tv for pc navigation receivers.
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Additional resources for A Software-Defined GPS and Galileo Receiver: A Single-Frequency Approach
Subframes 1, 2, and 3 repeat every 30 s while subframes 4 and 5 have 25 versions before repeating. 5 minutes. Courtesy: Frank van Diggelen. navigation data. 9 shows the overall structure of an entire navigation message. The basic format of the navigation data is a 1500-bit-long frame containing 5 subframes, each having length 300 bits. One subframe contains 10 words, each word having length 30 bits. Subframes 1, 2, and 3 are repeated in each frame. The last subframes, 4 and 5, have 25 versions (with the same structure, but different data) referred to as page 1 to 25.
Since h(t) = 0 for t < 0 for causal systems, we can also write y(t) as y(t) = ∞ −∞ x(λ)h(t − λ) dλ. Deﬁne the continuous-time exponential signal x(t) = e j 2π f t . 19) we then have y(t) = h(t) ∗ x(t) = h(t) ∗ e j 2π f t = ∞ −∞ h(λ)e j 2π f (t −λ) dλ = e j 2π f t ∞ −∞ h(λ)e− j 2π f λ dλ . 20) The expression in brackets is the Fourier transform of h(t), which we denote H ( f ). Now deﬁne the discrete-time exponential sequence x(n) = e j 2π f n = e j ωn . We can then characterize a discrete-time LTI system by its frequency response to x(n).
The convolution in the time domain corresponds to the multiplication of Fourier transforms in the frequency domain. Thus, for the system under consideration the Fourier transforms of the input and output signals are related to each other by Y ( f ) = H ( f )X ( f ). 22) In general, the transfer function H ( f ) is a complex quantity and can be expressed in magnitude and angle form as H ( f ) = H ( f ) e j arg(H ( f )) . The quantity |H ( f )| is called the amplitude response of the system, and the quantity arg(H ( f )) is called the phase response of the system.
A Software-Defined GPS and Galileo Receiver: A Single-Frequency Approach by Kai Borre, Dennis M. Akos, Nicolaj Bertelsen, Peter Rinder, Søren Holdt Jensen