By Irfan Ali, Pierino G. Bonanni, Naofal Al-Dhahir, John E. Hershey (auth.)
Doppler purposes in LEO satellite tv for pc verbal exchange Systems develops and provides a tremendous category of thoughts worthwhile within the development of little Low Earth Orbit (LEO) satellite tv for pc verbal exchange platforms. It facilities at the very major Doppler shift that attends communications via a LEO satellite tv for pc and exhibits how this phenomenon will be exploited for an unforeseen profit. The ideas taught within the booklet are anticipated to be fairly appealing to approach engineers simply because ground-based transceivers needs to in most cases make amends for the big Doppler part and accordingly the mandatory receiver processing loops are usually already in position and expensed.
This quantity begins with a recounting of the features of a LEO satellite tv for pc and its orbit. The 2d bankruptcy addresses the LEO orbital geometry and reports the Doppler influence attending LEO communications. bankruptcy 3 is targeted at the vital activity of estimating the Doppler at a flooring terminal. applicable sign processing algorithms are reviewed. bankruptcy 4 is worried with predicting LEO satellite tv for pc visibility. Chapters 5 and 6 are, respectively, dedicated to using the numerous LEO Doppler as an reduction in a brand new site visitors circulate regulate protocol and as an relief for effecting communications energy keep an eye on. The final bankruptcy describes MATLAB® established research.
Doppler functions in LEO satellite tv for pc conversation Systems offers an intensive evaluate of the LEO Doppler phenomenon.
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Extra info for Doppler Applications in LEO Satellite Communication Systems: CD-Rom Included
After the Doppler frequency is estimated accurately, its effect may be removed by de-rotating the received data symbols. Prior to data demodulation, an accurate estimate of any unknown phase offset may be calculated as the arctangent of the ratio of averaged quadrature to in-phase values of the de-rotated data symbols. Simulation results illustrate the effectiveness of the Doppler frequency estimation algorithms. 1. INTRODUCTION The relative movement, whether approach or escape, of a LEO satellite with respect to a receiving terminal on the surface of the Earth causes a shift in the carrier frequency of the received satellite signal.
NUMERICAL RESULTS The configuration for the numerical results consists of a satellite in a circular orbit (eccentricity=0) of altitude 1000 km and orbit inclination of 53°. ). A computer orbit generation program was used to generate exact Doppler-time curves. Doppler Characterization 35 Figure 14 consists of plots of exact normalized Doppler-time and the analytic Doppler-time (Equation (5)) approximation for a range of maximum elevation angles. In Figure 19, we provide numerical results for the visibility window duration versus maximum elevation angle.
J. Saulnier, and R. Nelson, “Doppler as a New Dimension for Multiple-access in LEO Satellite Systems,” International Journal of Satellite Communications, Vol. 15 No. 6, Nov-Dec 1997, p. 269-279.  I. Ali, N. E. Hershey, “Predicting the Visibility of LEO Satellites,” IEEE Transactions on Aerospace and Electronic Systems, Vol. 35, No. 4, October 1999, p. 1183-1189.  W. Mendenhall and T. Sincich, Statistics for Engineering and Computer Sciences, Second Edition, Dellen Publishing Company, 1988.