Frequency channel diversity for real-time locating systems, methods, and computer program products

• US 9,684,054 B2
• Filed: 07/03/2014
• Issued: 06/20/2017
• Est. Priority Date: 07/14/2010
• Status: Active Grant

• Current Assignee: Zebra Technologies Corporation
• Original Assignee: ZIH Corp. (Zebra Technologies Corporation)
• Inventors: Wisherd, David S., O'Hagan, James J.
• Primary Examiner(s): LIU, HARRY K
• Application Number:
  US14/323,534
• Publication Number:
  US 20150002337A1
• Time in Patent Office: 1,083 Days
• Field of Search: 342465
• CPC Class Codes: G01S 1/08 Systems for determining direction or position line
• CPC Class Codes: G01S 5/02213 Receivers arranged in a network for determining the position of a transmitter
• CPC Class Codes: G01S 5/0226 Transmitters
• CPC Class Codes: G01S 5/06 Position of source determined by co-ordinating a plurality of position lines defined by path-difference measurements G01S5/12 takes precedence

Abstract

Provided are architectures, systems, methods, and computer program products for real-time object locating and position determination using frequency channel diversity for transmitting and receiving position determination signals including bursts of location signals. Channelized frequency diversity of a short burst of small location signals that “hop” across multiple frequency channels is used to collectively produce a quasi-wideband position determination signal. Object tags operating with frequency channel diversity for transmitting location signals of position determination signals require low power consumption, but can still efficiently provide adequate position determination signals for reliable position determination.

Claims

1. A system comprising:

a plurality of wireless receivers, wherein the plurality of wireless receivers comprise at least one receiver configured to receive a location signal on a first frequency channel and at least one receiver configured to receive the location signal on a second frequency channel wherein the second frequency channel is distinct from the first frequency channel;

a controller configured to generate a position determination signal based on the location signal received by the plurality of wireless receivers; and

a transmitter configured to transmit the position determination signal to a central computer, wherein the location signal is transmitted at least on and within the first frequency channel in dynamically adjustable time duration bursts and on and within the second frequency channel in dynamically adjustable time duration bursts.

2. The system of claim 1, wherein the controller is configured to discard the location signal in an instance in which the location signal is determined to be outside of an acceptable range of values.

3. The system of claim 2, wherein the acceptable range of values is determined by the controller based upon the location signal received from the plurality of wireless receivers.

4. The system of claim 1, wherein the controller is configured to compile a data load partitioned between the data of the location signal received via the plurality of wireless receivers, and wherein the transmitter is further configured to transmit the data load.

5. The system of claim 1, further comprising a timer configured to measure an arrival time of the location signal received via each of the plurality of wireless receivers, wherein the controller is further configured to associate the location signal received via the first frequency channel with the corresponding arrival time of the location signal received via the second frequency channel, thereby defining the location data, and wherein the transmitter is further configured to transmit the arrival time with the location signal received via each of the plurality of wireless receivers to the central computer.

6. The system of claim 1, further comprising a timer configured to measure an arrival time of the location signal received via the first frequency channel, wherein the controller is further configured to determine the time differences of arrival of the location signal received via the second frequency channel, thereby defining the location data, and wherein the transmitter is further configured to transmit the time of arrival of the location signal received via the first frequency channel and the time differences of arrival of the location signal received via the second frequency channel to the central computer.

7. A system comprising:

a first wireless receiver configured to receive a location signal transmitted on a first frequency channel;

a second wireless receiver configured to receive the location signal transmitted on a second frequency channel, wherein the first frequency channel is at a different frequency when compared to the second frequency channel;

a controller configured to generate a position determination signal based on the location signal received by the first wireless receiver and the second wireless receiver; and

a transmitter configured to transmit the position determination signal to a central computer, wherein the location signal is transmitted at least on and within the first frequency channel in dynamically adjustable time duration bursts and on and within the second frequency channel in dynamically adjustable time duration bursts.

8. The system of claim 7, wherein the controller is configured to discard the location signal in an instance in which the location signal is determined to be outside of an acceptable range of values.

9. The system of claim 8, wherein the acceptable range of values is determined by the controller based upon the location signal received from the first wireless receiver and the second wireless receiver.

10. The system of claim 7, wherein the controller is configured to compile a data load partitioned between the data of the location signal received via first wireless receiver and the second wireless receiver, and wherein the transmitter is further configured to transmit the data load.

11. The system of claim 7, further comprising a timer configured to measure an arrival time of the location signal received via each of the first wireless receiver and the second wireless receiver, wherein the controller is further configured to associate the location signal received via the first frequency channel with the corresponding arrival time of the location signal received via the second frequency channel, thereby defining the location data, and wherein the transmitter is further configured to transmit the arrival time with the location signal received via each of the first wireless receiver and the second wireless receiver to the central computer.

12. The system of claim 7, further comprising a timer configured to measure an arrival time of the location signal received via the first frequency channel, wherein the controller is further configured to determine the time difference of arrival of the location signal received via the second frequency channel, thereby defining the location data, and wherein the transmitter is further configured to transmit the time of arrival of the location signal received via the first frequency channel and the time difference of arrival of the location signal received via the second frequency channel to the central computer.

13. The system of claim 7, wherein the first wireless receiver is configured to monitor the first frequency channel and the second wireless receiver is configured to monitor the second frequency channel.

14. A method, comprising:

receiving, by a plurality of wireless receivers, a location signal transmitted over multiple different frequency channels, wherein the plurality of wireless receivers comprise at least one receiver configured to receive location signals on a first frequency channel of the multiple different frequency channels and at least one receiver configured to receive location signals on a second frequency channel of the multiple different frequency channels, wherein the second frequency channel is distinct from the first frequency channel;

generating, by a controller, a position determination signal based on the location signal received by the plurality of wireless receivers; and

transmitting, by a transmitter, the position determination signal to a central computer, wherein the location signal is transmitted at least on and within the first frequency channel of multiple different frequency channels in dynamically adjustable time duration bursts and on and within the second frequency channel of the multiple different frequency channels in dynamically adjustable time duration bursts.

15. The method of claim 14, further comprising determining, by the controller, if the location signal received via one of the plurality of wireless receivers is outside of an acceptable range of values and, in an instance in which the location signal received via one of the multiple different frequency channels is outside of the acceptable range of values, discarding the location signal.

16. The method of claim 15, further comprising calculating, by the controller, the acceptable range of values based upon the location signal received via the plurality of wireless receivers.

17. The method of claim 14, further comprising:

compiling, by the controller, a data load partitioned between the location signal received via the multiple different frequency channels; and

transmitting, by the transmitter, the data load to the central computer.

18. The method of claim 14, further comprising:

measuring, by a timer, an arrival time of the location signal on each of the multiple frequency channels;

associating, by the controller, the location signal received on each of the multiple frequency channels with the corresponding arrival time; and

transmitting the arrival time with the location signal received on each of the multiple frequency channels to the central computer.

19. The method of claim 14, further comprising:

measuring, by a timer, an arrival time of the location signal received on each of the first frequency channel and the second frequency channel;

determining, by the controller, the time differences of arrival between the location signal received on each of the first frequency channel and the second frequency channel; and

transmitting the time of arrival of the location signal on at least one of the first frequency channel and the time differences of arrival between the location signal received via the second frequency channel to the central computer.

20. The method of claim 14, wherein at least one of the plurality of wireless receivers is configured to monitor a frequency channel of the multiple different frequency channels and at least another one of the plurality of wireless receivers that is configured to monitor a different frequency channel of the multiple different frequency channels.