| US 7,577,444 B2 | ||
| Method and apparatus for indicating the location of an object | ||
| Neil C Bird, Eindhoven (Netherlands); and Paul R. Simons, Redhill (United Kingdom) | ||
| Assigned to Koninklijke Philips Electronics N.V., Eindhoven (Netherlands) | ||
| Appl. No. 10/575,580 PCT Filed Oct. 12, 2004, PCT No. PCT/IB2004/052056 § 371(c)(1), (2), (4) Date Apr. 11, 2006, PCT Pub. No. WO2005/038480, PCT Pub. Date Apr. 28, 2005. |
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| Claims priority of application No. 0324098.3 (GB), filed on Oct. 15, 2003. | ||
| Prior Publication US 2007/0052534 A1, Mar. 08, 2007 | ||
| Int. Cl. H04W 24/00 (2006.01) | ||
| U.S. Cl. 455—456.2 [455/456.1; 455/456.3; 455/41.2; 455/457; 455/456.6] | 32 Claims |
| 1. A method of indicating the location of a relatively mobile object, comprising the acts of:
(a) generating a first signal that is characteristic of a first, relatively immobile object;
(b) transmitting the first signal from the first relatively immobile object;
(c) detecting the first signal at a receiver;
(d) generating a second signal that is characteristic of a second, relatively immobile object;
(e) transmitting the second signal from the second, relatively immobile object;
(f) detecting the second signal at the receiver;
(g) generating a third signal that is characteristic of the relatively mobile object;
(h) detecting the third signal at the receiver;
(i) operating a processing device operatively connected to the receiver using signal time-of-flight (t-o-f) data and/or received
signal strength information (RSSI) of the first, second and third signals received by the receiver to establish a distance
of the relatively mobile object respectively from the first and second relatively immobile objects; and
(j) generating a signal indicating whether the relatively mobile object is closer to the first or the second relatively immobile
object.
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