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US 2006/0133556 A1Published application
Device, system and method for obtaining timing information and ranging
AssigneeKoninklijke Philips Electronics N.V.
InventorAmites Sarkar
Life of this patent
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Abstract
A system includes first (1) and one or more second devices (2). A first signal (61) and a second signal (62) are transmitted from the first (1) to second (2) device and a third signal (63) is transmitted from the second to the first device. The times of these signals (61, 62, 63) being transmitted and received are measured and used to calculate timing information including a correction for different clock rates in first and second local clocks in the first and second devices.
Claims12
A method of obtaining timing information between first and second devices having respective first and second local clocks, including:
- transmitting a first signal from the first device to the second device at a first time t1 relative to the first local clock;
- measuring the second time t2 relative to the second local clock that the first signal arrives at the second device;
- transmitting a second signal from the first device to the second device at a third time t3, different to t1, relative to the first local clock;
- measuring the second time t4 relative to the second local clock that the second signal arrives at the second device;
- transmitting a third signal from the second device to the first device at a fifth time t5 relative to the second local clock;
- measuring the sixth time t6 relative to the first local clock at which the third signal arrives at the first device;
- and
- calculating timing information from the first, second, third, fourth, fifth and sixth times, including correcting for different clock rates and clock times in the first and second local clocks.
5 more elements
A system for obtaining timing information, comprising:
- a first device having a first local clock, a transmitter and a receiver, arranged:
- to transmit a first signal at a first time t1 relative to the first local clock;
- to transmit a second signal at a third time t3 relative to the first local clock;
- and
- to receive a third signal and to measure the sixth time t6 relative to the first local clock that the third signal arrives at the first device;
- and a second device having a second local clock, a transmitter and a
- receiver, arranged:
- to receive the first signal and to measure the second time t2 relative to the second local clock that the first signal arrives at the second device;
- to receive the second signal and to measure the fourth time t4 relative to the second local clock that the second signal arrives at the second device;
- and
- to transmit the third signal at a fifth time t5 relative to the second local clock;
- the system being arranged to calculate timing information from the first, second, third, fourth, fifth and sixth times including correcting for different clock rates and clock times in the first and second local clocks.
9 more elements
A device for operation together with a second device having a second local clock, the device comprising:
- a first local clock;
- a transmitter arranged to transmit to the second device a first signal at a first time t1 relative to the first local clock and to transmit to the second device a second signal at a third time t3 relative to the first local clock;
- and
- a receiver arranged to receive a third signal from the second device and to measure its arrival time at a sixth time t6 relative to the first local clock;
- and
- a calculation unit arranged to receive timing information from the second device including a second time t2 when the second device receives the first signal according to the second local clock, a fourth time t4 when the second device receives the second signal according to the second local clock and a fifth time t5 when the second device transmits the third signal according to the second local clock;
- and to calculate timing information from the first, second, third, fourth, fifth and sixth times including correcting for different clock rates and clock times in the first and second local clocks.
4 more elements
A device for operation together with a first device having a first local clock, the device comprising:
- a second local clock (26);
- a receiver arranged to receive first and second signals from the first device and to measure the arrival time of the first signal as a second time t2 according to the second local clock and to measure the arrival time of the second signal as a fourth time t4 according to the second local clock;
- and
- a transmitter arranged to transmit to the first device a third signal at a fifth time t5 relative to the second local clock;
- and
- a calculation unit arranged to receive timing information from the first device including a first time t1 when the first device transmits the first signal according to the first local clock, a third time t3 when the first device transmits the third signal according to the first local clock and a sixth time t6 when the first device receives the sixth signal according to the first local clock;
- and to calculate timing information from the first, second, third, fourth, fifth and sixth times including correcting for different clock rates and clock times in the first and second local clocks.
4 more elements
Dependencies are inferred from the claim text.