Gnss receiver using signals of opportunity and assistance...

G - Physics – 01 – S

Patent

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G01S 5/14 (2006.01)

Patent

CA 2724994

A GNSS receiver reduces the time to first fix by utilizing the properties of existing radiated signals of opportunity, such as AM or FM radio signals, televi-sion signals and so forth, to reduce the uncertainties asso-ciated with oscillator frequency and phase, and further uti-lizing an Almanac and battery backed-up date and time to determine the satellites in view and reduce the uncertain-ties associated with Doppler. The receiver may use multi-ple signals of opportunity to determine the city or local area in which the receiver is located based on the set of frequencies of the signals, and also to reduce search uncer-tainties for oscillator frequency by estimating an offset based on the differences between the frequencies of the re-spective signals of opportunity at the receiver and the nominal broadcast frequencies of the signals.

Récepteur GNSS permettant de réduire le délai de premier positionnement (TTFF) au moyen des propriétés de signaux d'opportunité rayonnés existants, notamment de signaux radio AM ou FM, de signaux de télévision et autres, afin de réduire les incertitudes associées à la fréquence et à la phase d'oscillateur, et au moyen d'un almanach et de la date et de l'heure secourues par batterie afin de déterminer les satellites en vue et de réduire les incertitudes associées à l'effet Doppler. Le récepteur peut utiliser une pluralité de signaux d'opportunité pour déterminer la ville ou l'agglomération dans laquelle il se trouve sur la base de l'ensemble des fréquences des signaux, et pour réduire les incertitudes de recherche associées à la fréquence d'oscillateur en estimant un décalage fondé sur les différences entre les fréquences des signaux d'opportunité respectifs au niveau du récepteur et les fréquences nominales de diffusion des signaux.

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