Method and apparatus for locating a golf ball with doppler radar

• US 8,400,346 B2
• Filed: 06/25/2010
• Issued: 03/19/2013
• Est. Priority Date: 06/25/2010
• Status: Expired due to Fees

• Current Assignee: Glass Wind LLC
• Original Assignee: Glass Wind LLC
• Inventors: Hubbard, Kevin M., Bevirt, Dennis P.
• Primary Examiner(s): Keith, Jack W
• Assistant Examiner(s): BYTHROW, PETER M
• Application Number:
  US12/823,404
• Publication Number:
  US 20110316733A1
• Time in Patent Office: 998 Days
• Field of Search: 342/27, 342/175, 342/195, 342/196, 473151-155, 473190-199, 473/353
• US Class Current: 342/27
• CPC Class Codes: A63B 24/0021 Tracking a path or terminating locations
• CPC Class Codes: G01S 13/04 Systems determining presence of a target based on relative movement of target G01S13/56
• CPC Class Codes: G01S 13/56 for presence detection presence detection using near field arrangements G01V3/00, e.g. G01V3/08, G01V3/12; burglar, theft or intruder alarms with electrical actuation G08B13/22 - G08B13/26

Abstract

A method comprises transmitting a radar signal into an target area, receiving reflected portions of the radar signal from the target area, and processing the reflected portions of the radar signal. The step of processing comprises windowing analog signals representative of the reflected portions of the radar signal, performing a fast Fourier transform on the windowed analog signals to produce an FFT result for each window, and obtaining the average of the FFT results from consecutive windows. In accordance with the method, a user receives indication from an indicator that a golf ball is present in the target area when the average of the FFT results corresponds to characteristics of the golf ball. The system comprises a radar transceiver, a processor for processing reflected portions of the radar signal, and an indicator indicating to the user a golf ball present in the target area.

Claims

1. A method comprising:

transmitting a doppler radar signal into an target area by moving a transmitter of the radar signal across the target area;

receiving reflected portions of the radar signal from the target area;

processing the reflected portions of the radar signal by windowing analog signals representative of the reflected portions of the radar signal, performing a fast Fourier transform on the windowed analog signals to produce an FFT result for each window, and obtaining the average of the FFT results from consecutive windows; and

indicating to the user a golf ball present in the target area when the average of the FFT results corresponds to characteristics of a golf ball.

2. The method of claim 1 further comprising:

establishing a lower threshold based upon a level of background noise from a sample of reflected portions of a radar signal directed to a non-target area having environmental characteristics similar to the target area.

3. The method of claim 2 further comprising:

indicating to the user the presence of the golf ball when the average of the FFT results is above the lower threshold.

4. The method of claim 1 further comprising:

establishing an upper threshold based upon a maximum variation in a sample of reflected portions of a radar signal directed to a non-target area having environmental characteristics similar to the target area.

5. The method of claim 4 further comprising:

indicating to the user the presence of the golf ball when the average of the FFT results is below the upper threshold.

6. The method of claim 1 wherein the characteristics of the golf ball comprise a spacing of the dimples on the golf ball.

7. A method comprising:

transmitting a doppler radar signal in a target area by moving a transmitter of the radar signal across the target area;

receiving reflected portions of the radar signal from the target area;

processing the reflected portions of the radar signal by windowing analog signals representative of the reflected portions of the radar signal, performing a fast Fourier transform on the windowed analog signals to generate an FFT result for each window, and obtaining the average of the FFT results from consecutive windows; and

indicating to the user a golf ball present in the target area when the average FFT result falls within a user defined window, the user defined window being based upon predetermined results representative of reflected radar signals corresponding to characteristics of a golf ball.

8. The method of claim 7 wherein the user defined window includes a lower threshold based upon a level of background noise from a sample of reflected portions of a radar signal directed to a non-target area having environmental characteristics similar to the target area.

9. The method of claim 7 wherein the user defined window includes an upper threshold based upon a maximum variation in a sample of reflected portions of a radar signal directed to a non-target area having environmental characteristics similar to the target area.

10. The method of claim 7 wherein the predetermined results are representative of reflected radar signals corresponding to a spacing of dimples on the golf ball.

11. A system comprising:

a doppler radar transceiver adapted to transmit a radar signal into a target area and receive reflected portions of the radar signal from the target area;

a processor configured to;

(i) window analog signals representative of the reflected portions of the radar signal;

(ii) perform a fast Fourier transform on the windowed analog signals to generate an FFT result for each window; and

(iii) average the FFT results from consecutive windows; and

a indicator indicating to the user a golf ball present in the target area when the average of the FFT results falls within a user defined window, the user defined window being based upon predetermined results representative of reflected radar signals corresponding to characteristics of a golf ball when the transceiver is moved across the target area.

12. The system of claim 11 wherein the user defined window includes a lower threshold based upon a level of background noise from a sample of reflected portions of a radar signal directed to a non-target area having environmental characteristics similar to the target area.

13. The system of claim 11 wherein the user defined window includes an upper threshold based upon a maximum variation in a sample of reflected portions of a radar signal directed to a non-target area having environmental characteristics similar to the target area.

14. The system of claim 11 wherein the predetermined results are representative of reflected radar signals corresponding to a spacing of dimples on the golf ball.

15. A system comprising:

a doppler radar transceiver adapted to transmit a radar signal into a target area and receive reflected portions of the radar signal from the target area;

a processor configured to;

(i) window analog signals representative of the reflected portions of the radar signal;

(ii) perform a fast Fourier transform on the windowed analog signals to generate an FFT result for each window; and

(iii) average the FFT results from consecutive windows; and

an indicator configured to indicate to the user a golf ball present in the target area when the average of the FFT results corresponds to characteristics of a golf ball when the transceiver is moved across the target area.

16. The system of claim 15 wherein the processor is further configured to establish a lower threshold based upon a level of background noise from a sample of reflected portions of a radar signal directed to a non-target area having environmental characteristics similar to the target area.

17. The system of claim 16 wherein the indicator indicates to the user the presence of the golf ball when the average of the FFT results is above the lower threshold.

18. The system of claim 15 wherein the processor is further configured to establish an upper threshold based upon a maximum variation in a sample of reflected portions of a radar signal directed to a non-target area having environmental characteristics similar to the target area.

19. The system of claim 18 wherein the indicator indicates to the user the presence of the target when the average of the FFT results is below the upper threshold.

20. The system of claim 15 wherein the characteristics of the golf ball comprise a spacing of dimples on the golf ball.