Smart/active RFID tag for use in a WPAN

• US 8,483,720 B2
• Filed: 06/11/2008
• Issued: 07/09/2013
• Est. Priority Date: 06/11/2008
• Status: Active Grant

• Current Assignee: NXP USA, Inc. (NXP Semiconductors NV)
• Original Assignee: Freescale Semiconductor, Inc. (NXP Semiconductors NV)
• Inventors: Farahani, Shahin, Chang, Kuor-Hsin, Powell, Clinton C
• Primary Examiner(s): Tran, Tuan A
• Application Number:
  US12/136,861
• Publication Number:
  US 20090311960A1
• Time in Patent Office: 1,854 Days
• Field of Search: 4554561-4566, 455/457, 455 411- 412, 455/552.1, 455/553.1, 340/572.1, 340/572.2, 340/572.4, 340/573.1, 340/10.1, 340/538.11, 340/538.15, 340/539.13, 340/539.23, 340/539.1, 342126-127, 342/386, 342/450, 342/453, 342/458, 342463-465
• US Class Current: 455/456.5
• CPC Class Codes: G01S 13/767 Responders; Transponders teaching or practice apparatus for gun-aiming or gun-laying using reflecting targets or active targets F41G3/26
• CPC Class Codes: G01S 5/0263 by combining or switching between positions derived from two or more separate positioning systems
• CPC Class Codes: G01S 5/0289 of multiple transceivers, e.g. in ad hoc networks
• CPC Class Codes: G01S 5/14 Determining absolute distances from a plurality of spaced points of known location
• CPC Class Codes: H04B 1/7163 using impulse radio
• CPC Class Codes: H04W 88/06 adapted for operation in multiple networks or having at least two operational modes, e.g. multi-mode terminals

Abstract

A system and method is provided for processing communication signals in a wireless personal area network (WPAN) using a transceiver comprising a first transmitter and a first receiver operable to transmit and receive signals using a first transmission protocol and a second transmitter operable to transmit signals using a second transmission protocol. In various embodiments, the first receiver is used to receive a first signal that was transmitted using the first communication protocol and the second transmitter is used to transmit a second signal using the second transmission protocol in response to receipt of the first signal. The second signal is then processed to determine the location of the object. In some embodiments, the first transmission protocol is compliant with an Institute of Electrical and Electronics Engineers 802.15.4 transmission protocol and the second transmission protocol is compliant with an Ultra-Wide Band (UWB) protocol.

Claims

1. A method for determining the location of an object using a transceiver co-located with said object, said transceiver comprising a first transmitter and a first receiver operable to transmit and receive signals using a first transmission protocol and a second transmitter operable to transmit signals using a second transmission protocol, the method comprising:

transmitting a first signal using said first transmission protocol;

using said first receiver to receive said first signal;

using said first transmitter to transmit a second signal using said first transmission protocol in response to receipt of said first signal, if said transceiver is outside transmission range of a node using said second transmission protocol;

using said second transmitter to transmit a second signal using said second transmission protocol in response to receipt of said first signal, if said transceiver is within transmission range of a node using said second transmission protocol; and

processing said second signal to determine the location of said object.

2. The method of claim 1, wherein said first transmission protocol is an IEEE 802.15.4 transmission protocol.

3. The method of claim 1, wherein said second transmission protocol is compliant with an Ultra Wide Band (UWB) protocol.

4. The method of claim 1, wherein said first signal is transmitted by a fixed node transceiver.

5. The method of claim 1, wherein said second transmitter is contained in a mobile transceiver node.

6. The method of claim 1, wherein circuitry comprising said first transmitter, said first receiver, and said second transmitter are fabricated on a single integrated circuit substrate.

7. A system for determining the location of an object using a transceiver co-located with said object, said transceiver comprising a first transmitter and a first receiver operable to transmit and receive signals using a first transmission protocol and a second transmitter operable to transmit signals using a second transmission protocol, wherein:

said first transmitter is configured to transmit a first signal using said first transmission protocol;

said first receiver is configured to receive said first signal;

said first transmitter is further configured to transmit a second signal using said first transmission protocol in response to receipt of said first signal, if said transceiver is outside transmission range of a node using said second transmission protocol;

said second transmitter is configured to transmit a second signal using said second transmission protocol in response to receipt of said first signal, if said transceiver is within transmission range of a node using said second transmission protocol; and

said second signal is processed to determine the location of said object.

8. The system of claim 7, wherein said first transmission protocol is an IEEE 802.15.4 transmission protocol.

9. The system of claim 7, wherein said second transmission protocol is compliant with an Ultra Wide Band (UWB) protocol.

10. The system of claim 7, wherein said first signal is transmitted by a fixed node transceiver.

11. The system of claim 7, wherein said second transmitter is contained in a mobile transceiver node.

12. The system of claim 7, wherein circuitry comprising said first transmitter, said first receiver, and said second transmitter are fabricated on a single integrated circuit substrate.

13. A transceiver for use in a wireless personal area network (WPAN), comprising:

a first transmitter and a first receiver operable to transmit and receive signals using a first transmission protocol;

a second transmitter operable to transmit signals using a second transmission protocol;

an Ultra Wide Band (UWB) antenna for transmitting signals using the first and second transmission protocols; and

an antenna diversity switch for selectively coupling the first and second transmitters to the UWB antenna;

wherein circuitry comprising said first transmitter, said first receiver, and said second transmitter are fabricated on a single integrated circuit substrate;

wherein said first transmission protocol is an IEEE 802.15.4 transmission protocol; and

wherein said second transmission protocol is compliant with an Ultra Wide Band (UWB) protocol.