| US 7,538,716 B2 | ||
| System and method for location determination using time differences | ||
| Yu-Sheng Lai, Hsinchu (Taiwan); and Wen-Yang Wang, Hsinchu (Taiwan) | ||
| Assigned to Industrial Technology Research Institute, Hsinchu (Taiwan) | ||
| Filed on Aug. 07, 2006, as Appl. No. 11/499,782. | ||
| Claims priority of application No. 94144938 A (TW), filed on Dec. 16, 2005. | ||
| Prior Publication US 2007/0139257 A1, Jun. 21, 2007 | ||
| Int. Cl. G01S 13/74 (2006.01); G01S 13/08 (2006.01) | ||
| U.S. Cl. 342—118 [342/42; 342/126; 342/146] | 13 Claims |
| 1. A system for location determination using time differences, comprising:
a directional transmitter, rotating at an angular velocity, for transmitting a transmission signal, the transmission signal
comprising a transmission identification and a transmitting time;
an omnidirectional transceiver, for receiving the transmission signal, adding a personal identification to the transmission
signal to be a response signal, and transmitting the response signal; and
an omnidirectional receiver, for receiving the response signal from the omnidirectional transceiver and recording a receiving
time, the directional transmitter and the omnidirectional receiver disposed in a wireless transceiver device for calculating
the location of the omnidirectional transceiver corresponding to the directional transmitter according to the difference between
the receiving time and the transmitting time.
|