Positioning system
First Claim
1. A positioning system for determining a position P of a positioning terminal, the system including a plurality of first signal sources each emitting a respective first signal, and one or more second signal sources each emitting a respective second signal, the first signals being synchronous to each other and the second signals being non-synchronous with the first signals, for, based on a signal propagation time and signal propagation speed of the first signals, determining a distance from the positioning terminal to the first signal sources so as to determine a position of the positioning terminal, said positioning system comprising:
- a measurement device for receiving the signals from the first signal sources to determine the position P and a time of measurement when the measurement device receives the first signals and for, based on the time of measurement, measuring a receiving time (TR) of a predetermined event of the second signals;
a control device for determining a signal propagation time (t) between the measurement device and one of the second signal sources by calculating a relative distance |P−
Q| between the measurement device and the one second signal source based on the position P measured by the measurement device and a position (Q) of the one second signal source and by dividing the resulting distance by the signal propagation speed, and for determining a time (TT) at which the one second signal source originates the predetermined event by solving TR−
t;
the positioning terminal having a receiving device for receiving the signals from the first and second signal sources; and
a communication device for communicating between the control device and the positioning terminal,wherein the positioning terminal uses the time TT as a reference to receive the signals from the first signal sources for positioning.
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Abstract
A positioning system is provided having a first signal source for originating synchronous signals, and a second signal source for originating a signal which is not synchronous with the signal from the first signal source. The system determines, based on a signal propagation time and signal propagation speed from the first or second signal source, the distance to this signal source so as to determine a position of a receiving point.
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Citations
12 Claims
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1. A positioning system for determining a position P of a positioning terminal, the system including a plurality of first signal sources each emitting a respective first signal, and one or more second signal sources each emitting a respective second signal, the first signals being synchronous to each other and the second signals being non-synchronous with the first signals, for, based on a signal propagation time and signal propagation speed of the first signals, determining a distance from the positioning terminal to the first signal sources so as to determine a position of the positioning terminal, said positioning system comprising:
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a measurement device for receiving the signals from the first signal sources to determine the position P and a time of measurement when the measurement device receives the first signals and for, based on the time of measurement, measuring a receiving time (TR) of a predetermined event of the second signals; a control device for determining a signal propagation time (t) between the measurement device and one of the second signal sources by calculating a relative distance |P−
Q| between the measurement device and the one second signal source based on the position P measured by the measurement device and a position (Q) of the one second signal source and by dividing the resulting distance by the signal propagation speed, and for determining a time (TT) at which the one second signal source originates the predetermined event by solving TR−
t;the positioning terminal having a receiving device for receiving the signals from the first and second signal sources; and a communication device for communicating between the control device and the positioning terminal, wherein the positioning terminal uses the time TT as a reference to receive the signals from the first signal sources for positioning. - View Dependent Claims (3, 4, 5, 6, 7, 12)
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2. A positioning system for determining a position P of a positioning terminal, the system including a plurality of first signal sources each emitting a respective first signal, and one or more second signal sources each emitting a respective second signal, the first signals being synchronous with each other and the second signals being non-synchronous with the first signals, for, based on a signal propagation time and signal propagation speed of at least one of the first and second signals, determining a distance from the positioning terminal to the first and second signal sources so as to determine a position of the positioning terminal, said positioning system comprising:
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a measurement device associated with each second signal source for receiving the signals from the first signal sources to determine the position P and a time of measurement when the measurement device receives the first signals and for, based on the time of measurement, measuring a receiving time (TR) of a predetermined event of the second signals; a control device for determining a signal propagation time (t) between the measurement device and its associated second signal source by calculating a relative distance |P−
Q| between the measurement device and its associated second signal source based on the position P measured by the measurement device and a position (Q) of the second signal source and by dividing the resulting distance by the signal propagation speed, and for determining a time (TT) at which the second signal source originates the predetermined event by solving TR−
t;the positioning terminal having a receiving device for receiving the signals from the first and second signal sources; and a communication device for communicating between the control device and the positioning terminal, wherein the positioning terminal receives the first and second signals for positioning. - View Dependent Claims (8, 9, 10, 11)
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Specification