Precise local positioning systems using ground-based transmitters
First Claim
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1. A method for determining a position solution, said method comprising:
- transmitting a first ranging signal with code modulation, wherein the first ranging signal is to be transmitted by a first ground transmitter and to be received by a rover;
receiving a second signal, the second signal to be received by the first ground transmitter from a second ground transmitter;
determining a ground transmitter time relative to a reference time, the ground transmitter time to be determined by the first ground transmitter based on the second signal received from the second ground transmitter;
communicating the ground transmitter time relative to the second ground transmitter, the ground transmitter time to be communicated to the rover by the first ground transmitter;
receiving the first ranging signal, the first ranging signal to be received by the rover; and
determining a position associated with the rover based on the ground transmitter time relative to the second ground transmitter and the first ranging signal, the position to be determined by the rover without synchronization of the first and second ground transmitters to a common clock source.
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Abstract
A precise positioning method and system is disclosed wherein at least one ground transmitter is used for transmitting a ranging signal with code modulation. The at least one ground transmitter is configured to receive a signal from at least one satellite and a second ground transmitter. The at least one ground transmitter measures a code phase of the received signals. The measured code phase information is communicated to a rover that is associated with a user. The rover can determine the user'"'"'s precise position based on the measured code and/or carrier phase information and a clock correction model.
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Citations
19 Claims
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1. A method for determining a position solution, said method comprising:
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transmitting a first ranging signal with code modulation, wherein the first ranging signal is to be transmitted by a first ground transmitter and to be received by a rover; receiving a second signal, the second signal to be received by the first ground transmitter from a second ground transmitter; determining a ground transmitter time relative to a reference time, the ground transmitter time to be determined by the first ground transmitter based on the second signal received from the second ground transmitter; communicating the ground transmitter time relative to the second ground transmitter, the ground transmitter time to be communicated to the rover by the first ground transmitter; receiving the first ranging signal, the first ranging signal to be received by the rover; and determining a position associated with the rover based on the ground transmitter time relative to the second ground transmitter and the first ranging signal, the position to be determined by the rover without synchronization of the first and second ground transmitters to a common clock source. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
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16. A system for determining a position of a rover, said system comprising:
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at least one ground transmitter communicatively coupled to a second ground transmitter, wherein said at least one ground transmitter is operatively configured to, when in operation, transmit a wideband ranging signal; and
to determine a transmitter time relative to a reference time based on the second ground transmitter;a rover communicatively coupled to the at least one ground transmitter, wherein said rover;
is operatively configured to, when in operation, receive said wideband ranging signal from the at least one ground transmitter and to determine said position of the rover based on said wideband signal without a need for synchronization of the at least one around transmitter to a common clock source and wherein said position of the rover is determined within one meter level of accuracy. - View Dependent Claims (17)
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18. A transmitter method for determining a position, said transmitter method comprising:
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transmitting a ranging signal with code modulation to an external rover; receiving a second ranging signal from another transmitter; determining the transmitter clock based on the second ranging signal received from the another transmitter; determining a relative transmitter clock, the relative transmitter clock to be determined based on the transmitter clock relative to a reference clock without a need for synchronization of the transmitter and the other transmitter to a common clock source; and generating a clock model based on relative transmitter clock. - View Dependent Claims (19)
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Specification