| US 7,595,755 B2 | ||
| Distance estimation | ||
| Timothy Newton, Cambridge (United Kingdom); James Collier, Cambridge (United Kingdom); and Candido Levita, Cambridge (United Kingdom) | ||
| Assigned to Cambridge Silicon Radio Limited, Cambridge (United Kingdom) | ||
| Filed on Aug. 15, 2005, as Appl. No. 11/161,738. | ||
| Application 11/161738 is a continuation of application No. PCT/GB2004/000630, filed on Feb. 18, 2004. | ||
| Prior Publication US 2006/0154611 A1, Jul. 13, 2006 | ||
| Int. Cl. G01S 13/10 (2006.01) | ||
| U.S. Cl. 342—458 [342/127] | 14 Claims |
| 1. A method for estimating the distance between a transmitter and a receiver, the transmitter being arranged to transmit a
signal as a series of bursts, and the carrier frequency of each burst being set according to a predetermined sequence, the
method comprising:
forming a first series comprising the measured differences between the phases of successive bursts as received at the receiver;
forming a plurality of second series each comprising estimated differences between the phases of successive bursts as received
at a respective supposed time difference between the transmitter and the receiver;
determining the qualities of fit between the first series and each of the second series; and
adopting the supposed difference corresponding to the second series having the highest quality of fit to the first series
as an estimate of the time difference between the transmitter and the receiver.
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