Pseudolite-based precise positioning system with synchronised pseudolites
First Claim
1. A precise navigation system using pseudolites that can determine a position of a mobile station even without correction information transmitted from a reference station through a data link, comprising:
- a master pseudolite having a reference clock of the navigation system;
at least one slave pseudolite having a digitally controlled numerical controlled oscillating means;
a mobile station which determines a position of the mobile station based on a clock synchronized signal transmitted from the master and slave pseudolites even without correction information transmitted from the reference station through the data link; and
a clock synchronization loop filtering means for generating synchronization information Uk of the slave pseudolite(s) based on the pseudorange and/or carrier-phase information received from the master pseudolite and the slave pseudolite(s), and transmitting the synchronization information Uk to the digitally controlled numerical controlled oscillating means so that the digitally controlled numerical controlled oscillating means could synchronize the clock(s) of the slave pseudolite(s) with the reference clock of the master pseudolite.
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Accused Products
Abstract
Pseudolite-based precise positioning system with synchronised pseudolites that can compute the position of a mobile station with slave pseudolites synchronised to master pseudolite is provided. Therefore pseudolite-based precise positioning system according to present invention does not need correction information of a reference station. A pseudolite-based precise positioning system for computing the position of a mobile station without correction information of a reference station, the pseudolite-based precise positioning system includes: master pseudolite with reference clock of the positioning system; at least one slave pseudolite having digitally controlled numerical controlled oscillator means; mobile station computing the position of itself based on the clock-synchronised signal from the master pseudolite and the slave pseudolite without correction information of a reference station; and clock synchronisation loop filter means having the digitally controlled numerical controlled oscillator means synchronise the clock of the slave pseudolite to the clock of the master pseudolite by transmitting synchronisation information U k? of the slave pseudolite to the digitally controlled numerical controlled oscillator means, clock synchronisation loop filter means generating the synchronisation information U k? based on the pseudorange information and carrier phase information received from the master pseudolite and the slave pseudolite.
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Citations
13 Claims
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1. A precise navigation system using pseudolites that can determine a position of a mobile station even without correction information transmitted from a reference station through a data link, comprising:
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a master pseudolite having a reference clock of the navigation system;
at least one slave pseudolite having a digitally controlled numerical controlled oscillating means;
a mobile station which determines a position of the mobile station based on a clock synchronized signal transmitted from the master and slave pseudolites even without correction information transmitted from the reference station through the data link; and
a clock synchronization loop filtering means for generating synchronization information Uk of the slave pseudolite(s) based on the pseudorange and/or carrier-phase information received from the master pseudolite and the slave pseudolite(s), and transmitting the synchronization information Uk to the digitally controlled numerical controlled oscillating means so that the digitally controlled numerical controlled oscillating means could synchronize the clock(s) of the slave pseudolite(s) with the reference clock of the master pseudolite. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. A precise navigation system using pseudolites that can determine a position of a mobile station even without correction information transmitted from a reference station through a data link, comprising:
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a master pseudolite having a reference clock of the navigation system;
at least one slave pseudolite having a digitally controlled numerical controlled oscillating means connected to the master pseudolite though a cable or wireless data link and controls its clocks based on the reference clock transmitted from the master pseudolite; and
a mobile station which determines a position of the mobile station based on a clock synchronized signal transmitted from the master and slave pseudolites even without correction information transmitted from the reference station through the data link.
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Specification