System and method for ground penetrating radar communication using antenna crosstalk

• US 9,581,691 B2
• Filed: 06/09/2011
• Issued: 02/28/2017
• Est. Priority Date: 06/09/2011
• Status: Active Grant

• Current Assignee: Deere & Company, Louisiana Tech University
• Original Assignee: Deere & Company, Louisiana Tech University
• Inventors: Simicevic, Neven, Jaganathan, Arun, Montgomery, James L., Olson, Jay H.
• Primary Examiner(s): WINDRICH, MARCUS E
• Application Number:
  US14/124,567
• Publication Number:
  US 20140218225A1
• Time in Patent Office: 2,091 Days
• Field of Search: 342/22
• US Class Current: 1/1
• CPC Class Codes: G01S 13/885 for ground probing prospecting or detecting using electromagnetic waves G01V3/12
• CPC Class Codes: H01Q 13/085 Slot-line radiating ends
• CPC Class Codes: H01Q 19/10 using reflecting surfaces
• CPC Class Codes: H01Q 21/08 the units being spaced along or adjacent to a rectilinear path waveguide fed H01Q21/0037
• CPC Class Codes: H01Q 9/28 Conical, cylindrical, cage, strip, gauze, or like elements having an extended radiating surface; Elements comprising two conical surfaces having collinear axes and adjacent apices and fed by two-conductor transmission lines waveguide horns or mouths H01Q13/00; slot antennas H01Q13/00

Abstract

An object detection system (24) is disclosed having a transducer (40, 40′) for detecting buried objects (26). The transducer is encapsulated within a robust, electromagnetically transparent construction (42).

Claims

1. A method of communicating with ground penetrating radar, the method including the steps of:

providing a transmitter and a detector each coupled to a tool configured to penetrate the ground;

communicating a ground-penetrating signal with the transmitter;

detecting crosstalk from the ground-penetrating signal with the detector; and

determining, based on a characteristic of the crosstalk, that at least one of the transmitter or the detector is contacting the ground or is not contacting the ground.

2. The method of claim 1, wherein the characteristic of the crosstalk is an arrival time of the crosstalk at the detector after communicating the ground-penetrating signal.

3. The method of claim 1, wherein the characteristic of the crosstalk is the magnitude of the crosstalk.

4. The method of claim 1, wherein the detector and the transmitter are spaced apart on the tool.

5. The method of claim 1, wherein the transmitter and the detector each include a transducer and a dielectric medium, wherein at least a portion of the transducer is positioned within the dielectric medium.

6. The method of claim 1, further including:

determining, based on the characteristic of the crosstalk, that at least one of the transmitter or the detector is contacting the ground; and

communicating a second ground-penetrating signal with the transmitter based on determining that the at least one of the detector or the transmitter is contacting the ground, the second ground-penetrating signal having at least one of a greater magnitude or a greater frequency than the ground-penetrating signal.

7. The method of claim 6, further including detecting an object positioned in the ground based on a reflection of the second ground-penetrating signal from the object.

8. The method of claim 1, further including:

moving the tool from a first position to a second position; and

communicating a first ground-penetrating signal with the transmitter when the tool is in the first position and communicating a second ground-penetrating signal with the transmitter when the tool is in the second position.

9. The method of claim 8, wherein determining that at least one of the transmitter or the detector is contacting the ground or is not contacting the ground based on the characteristic of the crosstalk includes comparing the characteristic of the crosstalk from the first ground-penetrating signal with the characteristic of the crosstalk from the second ground-penetrating signal.

10. A method of communicating with ground penetrating radar, the method including the steps of:

providing a tool and a detection system coupled to the tool, the detection system including a transmitter and a receiver, the tool being configured to penetrate the ground;

communicating a ground-penetrating signal with the transmitter;

determining, based on crosstalk between the transmitter and the receiver, that the detection system is contacting the ground; and

increasing a magnitude of the ground-penetrating signal based on a determining that the detection system is contacting the ground.

11. The method of claim 10, further including moving the tool from a first position to a second position, wherein in the first position the detection system is positioned away from the ground and in the second position the detection system is positioned in contact with the ground.

12. The method of claim 11, wherein the ground-penetrating signal has a first magnitude based on the tool being in the first position, and the ground-penetrating signal has a second magnitude based on the tool being in the second position, the second magnitude being greater than the first magnitude.

13. The method of claim 10, wherein increasing the magnitude of the ground-penetrating signal includes increasing at least one of the power or the frequency of the ground-penetrating signal.

14. The method of claim 10, wherein determining that the detection system is contacting the ground includes comparing a characteristic of the crosstalk between the transmitter and the receiver when the tool is in the first position with the characteristic of the crosstalk when the tool is in the second position.

15. A method of communicating with ground penetrating radar, the method including the steps of:

providing a tool and a detection system coupled to the tool, the detection system including a transmitter and a receiver and being configured to detect an object positioned in the ground;

penetrating the ground with the tool to create a penetration;

communicating a signal between the transmitter and the object;

identifying crosstalk from the signal with the receiver;

determining a dielectric property of a portion of the ground positioned between the transmitter and the receiver based on the crosstalk of the signal.

16. The method of claim 15, wherein the dielectric property is determined based on the arrival time of the crosstalk at the receiver after the signal is communicated from the transmitter.

17. The method of claim 15, wherein the dielectric property is determined based on the magnitude of crosstalk.

18. The method of claim 15, wherein the transmitter and the receiver are spaced apart by a distance, and the determination of the dielectric property of the portion of the ground is further based on the distance between the transmitter and the receiver.

19. The method of claim 15, further including detecting the object positioned in the ground based on a reflection of the signal from the object and calculating a position of the object based on the reflection and the determined dielectric property of the ground.

20. The method of claim 15, wherein the transmitter and the receiver each include a transducer and a dielectric medium, wherein at least a portion of the transducer is positioned within the dielectric medium to substantially reduce signal loss between the transducer and the ground.

21. A construction vehicle including:

a chassis;

a plurality of traction devices positioned to support the chassis;

a work tool supported by the chassis and configured to penetrate the ground; and

a detection system including a transmitter configured to communicate a ground-penetrating signal and a detector configured to detect crosstalk from the ground-penetrating signal, the transmitter and the detector being mounted to the work tool, the detection system being configured to determine that at least one of the detector or the transmitter is contacting the ground or is not contacting the ground based on a characteristic of the crosstalk from the ground-penetrating signal.

22. The construction vehicle of claim 21, wherein the characteristic of the crosstalk includes at least one of the arrival time of the crosstalk at the detector or the magnitude of the crosstalk.

23. The construction vehicle of claim 21, wherein the detection system includes a controller configured to analyze the crosstalk detected with the detector to determine that the at least one of the detector or the transmitter is contacting the ground and to initiate a control event based on the at least one of the detector or the transmitter contacting the ground.

24. The construction vehicle of claim 23, wherein the control event includes increasing at least one of the power or the frequency of the ground-penetrating signal.

25. The construction vehicle of claim 21, wherein the detection system includes a display configured to provide a visual indication that the at least one of the detector or the transmitter is in contact with the ground.

26. The construction vehicle of claim 21, wherein the detection system is configured to provide an audio signal upon a determination that the at least one of the detector or the transmitter is in contact with the ground.

27. The construction vehicle of claim 21, wherein the transmitter and the detector each include a transducer and a dielectric medium, wherein at least a portion of the transducer is positioned within the dielectric medium.