PSEUDOLITE-BASED PRECISE POSITIONING SYSTEM WITH SYNCHRONISED PSEUDOLITES
First Claim
1. A method for synchronizing a clock of a slave pseudolite with a reference clock of a master pseudolite in a precise navigation system, comprising the steps of:
- synchronizing the clock of the slave pseudolite with the reference clock of the master pseudolite based on pseudorange of the master and the slave pseudolites;
performing a frequency synchronization process based on Doppler of the master and the slave pseudolites; and
performing a phase synchronization process based on the carrier-phase of the master and the slave pseudolites.
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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 Uk of the slave pseudolite to the digitally controlled numerical controlled oscillator means, clock synchronisation loop filter means generating the synchronisation information Uk based on the pseudorange information and carrier phase information received from the master pseudolite and the slave pseudolite.
22 Citations
10 Claims
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1. A method for synchronizing a clock of a slave pseudolite with a reference clock of a master pseudolite in a precise navigation system, comprising the steps of:
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synchronizing the clock of the slave pseudolite with the reference clock of the master pseudolite based on pseudorange of the master and the slave pseudolites; performing a frequency synchronization process based on Doppler of the master and the slave pseudolites; and performing a phase synchronization process based on the carrier-phase of the master and the slave pseudolites. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A method for synchronizing a reference clock of a master slave with a clock of a slave pseudolite in a precise navigation system, comprising the steps of:
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performing the clock synchronization process which synchronizes the clock of the slave pseudolite with the clock of the master pseudolite based on the single differenced pseudorange and carrier-phase of the master and slave pseudolites by controlling the clock of the slave pseudolite for a predetermined time so that the single differenced pseudorange is matched with a geometrical distance between the master pseudolite and the slave pseudolites; performing a frequency synchronization process based on Doppler of the master and slave pseudolites by performing discreteness of a single differenced Doppler; and performing a phase synchronization process based on the carrier-phase by performing discreteness of the carrier-phase synchronization error, wherein the clock synchronization process, the frequency synchronization process and the phase synchronization process are sequentially performed.
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Specification