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

This booklet discover using new applied sciences within the sector of satellite tv for pc navigation receivers. so as to construct a reconfigurable receiver with a variety of purposes, the authors speak about receiver structure according to software-defined radio options. The presentation unfolds in a straightforward type and is going from the fundamentals to state-of-the-art examine. The publication is geared toward utilized mathematicians, electric engineers, geodesists, and graduate scholars. it can be used as a textbook in quite a few GPS know-how 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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Additional info for A Software-Defined GPS and Galileo Receiver: A Single-Frequency Approach

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This will only be a cursory description of the data in the different words and not a complete description of all bits. 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.

So additional correlators are needed for measuring the correlation profile at half a subcarrier phase from prompt correlator at either side. 4. GPS C/A and Galileo BOC(1,1) sharing L1 spectrum. 42 MHz. If one of the output values of these so-called very early and very late correlators is higher than the punctual correlation, the channel is tracking a side peak and corrective action is taken. According to Nunes & Sousa & Leitão (2004), the ACF for BOC( pn, n) with | is given as p = 1, 2, . . and k = 2 p|τ Tc r (τ ) = (−1)k+1 1 2 p (−k + 2kp + k − p) − (4 p − 2k + 1) |τTc| , for |τ | ≤ Tc , 0, otherwise.

So let us assume a relative signal power of 50% for A, and 25% for both B and C. The first condition expresses that the norm of the I and the Q part of the signal S must be unity: (α − α)2 + (β + γ )2 = 1. The condition of equal power for both I and Q channels leads to α2 + α2 = β 2 . Finally, the condition that the combined power equals one leads to α 2 + α 2 + β 2 + γ 2 = 1. In total, we have three equations in three unknowns: β + γ = 1, 2α 2 = β 2 , 2α 2 + β 2 + γ 2 = 1. 36 3. 1. 3333 −1 |S(t)| 1 1 1 1 1 1 1 1 The useful solution is α= √ 2 , 3 β= 2 , 3 γ = 1 .

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