Radio frequency environment object monitoring system and methods of use

• US 8,120,488 B2
• Filed: 02/27/2009
• Issued: 02/21/2012
• Est. Priority Date: 02/27/2009
• Status: Active Grant

• Current Assignee: RF Controls LLC
• Original Assignee: RF Controls LLC
• Inventors: Bloy, Graham P.
• Primary Examiner(s): Bugg, George
• Assistant Examiner(s): MCNALLY, KERRI L
• Application Number:
  US12/395,595
• Publication Number:
  US 20100219953A1
• Time in Patent Office: 1,089 Days
• Field of Search: 340/572.1
• US Class Current: 340/572.1
• CPC Class Codes: G01S 13/003 Bistatic radar systems; Multistatic radar systems
• CPC Class Codes: G01S 13/04 Systems determining presence of a target based on relative movement of target G01S13/56
• CPC Class Codes: G01S 13/758 using a signal generator powered by the interrogation signal
• CPC Class Codes: G01S 13/82 wherein continuous-type signals are transmitted
• CPC Class Codes: G01S 13/872 Combinations of primary radar and secondary radar
• CPC Class Codes: G01S 2013/0245 Radar with phased array antenna
• CPC Class Codes: G06Q 10/087 Inventory or stock management, e.g. order filling, procurement or balancing against orders

Abstract

A method and apparatus for monitoring untagged objects in a target area including calibrating a radio environment monitoring system including a rules engine and a baseline data set for a target area by recording a set of changes to the RF environment fingerprint of the target area received by the radio environment monitoring system as the target area is filled with objects. During system operation, scanning the target area with the radio environment monitoring system for a current RF environment fingerprint, comparing the current RF environment fingerprint with the baseline data set by a rules engine and reporting an output of the rules engine.

Claims

1. A method for monitoring untagged objects in a target area, comprising the steps of:

calibrating a three dimensional radio environment monitoring system for a target area by recording a baseline data set of changes to an RF environment fingerprint of the target area received by the three dimensional radio environment monitoring system as the target area is filled with objects;

each of a plurality of records of the baseline data set is averaged from multiple scans of the target area during a static object condition;

scanning the target area with the three dimensional radio environment monitoring system for a current RF environment fingerprint;

comparing the current RF environment fingerprint with the baseline data set by a rules engine; and

reporting an output of the rules engine.

2. The method of claim 1, wherein the baseline data set includes changes to the RF environment fingerprint caused by filling the target area with multiple objects in multiple positions within the target area.

3. The method of claim 1, wherein the rules engine includes a line of sight parameter wherein a degradation of a signal response from a reference RFID in the target area indicates the presence of an object along a line of sight between the reference RFID and an antenna associated with the signal response.

4. The method of claim 1, wherein the rules engine includes a dynamic pseudo emitter parameter wherein a pseudo emitter that appears and or disappears correlates to an object being positioned at a known location according to the baseline data set.

5. The method of claim 1, wherein the rules engine includes a static pseudo emitter parameter wherein a signal degradation of a static pseudo emitter correlates to an object being positioned at a known location according to the baseline data set.

6. The method of claim 1, wherein the rules engine output is an inventory report indicating that an inventory of an object has fallen below a preset amount.

7. The method of claim 1, wherein the rules engine output is coupled to an electronic stock keeping system that issues a purchase order for an object that has fallen below a preset amount.

8. The method of claim 1, wherein the RF environment fingerprint is averaged from multiple scans of the target area.

9. The method of claim 1, wherein the rules engine applies a probability factor to an object presence determination.

10. The method of claim 9, wherein the rules engine only outputs object presence determinations that have a probability factor above a preset level.

11. The method of claim 1, wherein objects with RFID tags are included as sources of reference RFID tags during RF environment fingerprint monitoring.

12. A method for monitoring untagged objects in a target area, comprising the steps of:

calibrating a three dimensional radio environment monitoring system for a target area by recording a baseline data set of changes to an RF environment fingerprint of the target area received by the three dimensional radio environment monitoring system as the target area is filled with objects;

scanning the target area with the three dimensional radio environment monitoring system for a current RF environment fingerprint;

comparing the current RF environment fingerprint with the baseline data set by a rules engine; and

reporting an output of the rules engine;

wherein the appearance in the RF environment fingerprint of a registered reference RFID indicates a change to the target area access.

13. The method of claim 12, wherein the change to the target area access is the opening of a door.

14. A method for monitoring untagged objects in a target area, comprising the steps of:

calibrating a three dimensional radio environment monitoring system for a target area by recording a baseline data set of changes to an RF environment fingerprint of the target area received by the three dimensional radio environment monitoring system as the target area is filled with objects;

the baseline data set including changes to the RF environment fingerprint caused by filling the target area with multiple objects in multiple positions within the target area;

scanning the target area with the three dimensional radio environment monitoring system for a current RF environment fingerprint;

comparing the current RF environment fingerprint with the baseline data set by a rules engine;

the rules engine including a line of sight parameter wherein a degradation of a signal response from a reference RFID in the target area indicates the presence of an object along a line of sight between the reference RFID and an antenna associated with the signal response;

the rules engine including a dynamic pseudo emitter parameter wherein a pseudo emitter that appears and or disappears correlates to an object being positioned at a known location according to the baseline data set;

the rules engine includes a static pseudo emitter parameter wherein a signal degradation of a static pseudo emitter correlates to an object being positioned at a known location according to the baseline data set; and

reporting an output of the rules engine.

15. The method of claim 14, wherein the rules engine applies a probability factor to an object presence determination.

16. The method of claim 15, wherein the rules engine only outputs object presence determinations that have a probability factor above a preset level.