Investigation of Pulsing Schemes for Pseudolite Applications

Cillian O'Driscoll, Daniele Borio, Joaquim Fortuny-Guasch

Abstract:	Pseudolites, or pseudo-satellites, are ground based transmitters of radio frequency (RF) signals for ranging, navigation and timing applications. Unlike Global Navigation Satellite System (GNSS) signals, pseudolite signals can be received with significant differences in power levels. This results in the so-called “near-far” problem, whereby a signal from a nearby transmitter completely masks one from further away. In addition, if pseudolite signals are transmitted in GNSS bands then the pseudolite signal can cause significant degradation to non-participating (non pseudolite enabled) GNSS receivers. To overcome these issues the pseudolite signal can be pulsed, that is transmitted in short high power bursts with low duty cycle. This paper presents a thorough analysis of the important parameters in the design of pseudolite pulsing schemes. Some simple bounds on the properties of any pulsing scheme are derived and the important parameters to be considered are highlighted. A simple construction of pulsing schemes is described, which can be viewed as a generalisation of a well-known existing scheme. Finally, some sample schemes are described for application to a variety of existing civil GNSS signals.
Published in:	Proceedings of the 24th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GNSS 2011) September 20 - 23, 2011 Oregon Convention Center, Portland, Oregon Portland, OR
Pages:	3480 - 3492
Cite this article:	O'Driscoll, Cillian, Borio, Daniele, Fortuny-Guasch, Joaquim, "Investigation of Pulsing Schemes for Pseudolite Applications," Proceedings of the 24th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GNSS 2011), Portland, OR, September 2011, pp. 3480-3492.
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