System for determining position using two way time transfer signals
First Claim
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1. A system for enhancing position determination by a rover, the system comprising:
- A. one or more base stations in known locations, each base station including one or more receivers for receiving and processing return two way time transfer (TWTT) signals from one or more rovers and determining information relating to position and clock differences for the respective rovers based on the time travel of the return TWTT signals, and one or both of a phase offset of a code in the return TWTT signals and timing information included in the return TWTT signals, anda transmitter for transmitting one or more TWTT signals, the transmitter further transmitting information related to one or both of the locations of and the timing at the respective one or more rovers;
B. the one or more rovers, each rover including one or more receivers for receiving the TWTT signals and the information transmitted by the one or more base stations, processing the information transmitted by the one or more base stations and determining position, timing or both, anda transmitter for transmitting to the one or more base stations the return TWTT signals that are in response to the receipt of TWTT signals transmitted by the one or more base stations.
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Abstract
A system for enhancing location estimates by movable rovers including one or more base stations that engage in two way time transfer (TWTT) with the rovers. Each TWTT operation between a given base station and a given rover provides range measurements and clock differences between the base station and rover. The range measurements are based on the travel time of return TWTT signals and the clock differences are based on a phase offset of a code in the return TWTT signal and/or timing information included in the return TWTT signals.
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Citations
25 Claims
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1. A system for enhancing position determination by a rover, the system comprising:
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A. one or more base stations in known locations, each base station including one or more receivers for receiving and processing return two way time transfer (TWTT) signals from one or more rovers and determining information relating to position and clock differences for the respective rovers based on the time travel of the return TWTT signals, and one or both of a phase offset of a code in the return TWTT signals and timing information included in the return TWTT signals, and a transmitter for transmitting one or more TWTT signals, the transmitter further transmitting information related to one or both of the locations of and the timing at the respective one or more rovers; B. the one or more rovers, each rover including one or more receivers for receiving the TWTT signals and the information transmitted by the one or more base stations, processing the information transmitted by the one or more base stations and determining position, timing or both, and a transmitter for transmitting to the one or more base stations the return TWTT signals that are in response to the receipt of TWTT signals transmitted by the one or more base stations. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
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16. A ranging base station comprising:
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a transmitter for transmitting two way time transfer (TWTT) signals and further transmitting to one or more rovers respective range measurements; and a receiver for receiving and processing returned TWTT signals from the one or more rovers and determining the range measurements to the respective rovers based on the time travel of the return TWTT signals, and one or both of a phase offset of a code in the return TWTT signals and timing information included in the return TWTT signals. - View Dependent Claims (17, 18, 19, 20, 21)
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22. A system for enhancing position determination by a rover, the system comprising:
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A. a base station in a known location, the base station including; one or more receivers for receiving and processing return two way time transfer (TWTT) signals from one or more rovers and determining information relating to position, timing, or both, for the respective rovers based on the time travel of the return TWTT signals, and one or both of a phase offset of a code in the return TWTT signals and timing information included in the return TWTT signals, and a transmitter for transmitting one or more TWTT signals in synchronism with the transmission of GNSS signals by GNSS satellites, the transmitter further transmitting information related to one or both of the locations of and the timing at the respective one or more rovers; B. the one or more rovers, each rover including one or more receivers for receiving the TWTT signals and the information transmitted by the base station, processing the information transmitted by the base station and determining position information, timing or both, and a transmitter for transmitting to the base station the return TWTT signals that are in response to the receipt of TWTT signals transmitted by the base station. - View Dependent Claims (23, 24, 25)
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Specification