GB2395438A - Golf ball locating system - Google Patents

Golf ball locating system Download PDF

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Publication number
GB2395438A
GB2395438A GB0227063A GB0227063A GB2395438A GB 2395438 A GB2395438 A GB 2395438A GB 0227063 A GB0227063 A GB 0227063A GB 0227063 A GB0227063 A GB 0227063A GB 2395438 A GB2395438 A GB 2395438A
Authority
GB
United Kingdom
Prior art keywords
golf ball
electromagnetic radiation
frequency
detecting
transmitted
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
GB0227063A
Other versions
GB0227063D0 (en
Inventor
Keith Trafford
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Qinetiq Ltd
Original Assignee
Qinetiq Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Qinetiq Ltd filed Critical Qinetiq Ltd
Priority to GB0227063A priority Critical patent/GB2395438A/en
Publication of GB0227063D0 publication Critical patent/GB0227063D0/en
Publication of GB2395438A publication Critical patent/GB2395438A/en
Withdrawn legal-status Critical Current

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Classifications

    • A—HUMAN NECESSITIES
    • A63—SPORTS; GAMES; AMUSEMENTS
    • A63B—APPARATUS FOR PHYSICAL TRAINING, GYMNASTICS, SWIMMING, CLIMBING, OR FENCING; BALL GAMES; TRAINING EQUIPMENT
    • A63B24/00—Electric or electronic controls for exercising apparatus of preceding groups; Controlling or monitoring of exercises, sportive games, training or athletic performances
    • A63B24/0021—Tracking a path or terminating locations
    • A—HUMAN NECESSITIES
    • A63—SPORTS; GAMES; AMUSEMENTS
    • A63B—APPARATUS FOR PHYSICAL TRAINING, GYMNASTICS, SWIMMING, CLIMBING, OR FENCING; BALL GAMES; TRAINING EQUIPMENT
    • A63B37/00—Solid balls; Rigid hollow balls; Marbles
    • A63B37/0003—Golf balls
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
    • G01S13/00—Systems using the reflection or reradiation of radio waves, e.g. radar systems; Analogous systems using reflection or reradiation of waves whose nature or wavelength is irrelevant or unspecified
    • G01S13/74—Systems using reradiation of radio waves, e.g. secondary radar systems; Analogous systems
    • G01S13/75—Systems using reradiation of radio waves, e.g. secondary radar systems; Analogous systems using transponders powered from received waves, e.g. using passive transponders, or using passive reflectors
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q1/00—Details of, or arrangements associated with, antennas
    • H01Q1/12—Supports; Mounting means
    • H01Q1/22—Supports; Mounting means by structural association with other equipment or articles
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q1/00—Details of, or arrangements associated with, antennas
    • H01Q1/36—Structural form of radiating elements, e.g. cone, spiral, umbrella; Particular materials used therewith
    • H01Q1/38—Structural form of radiating elements, e.g. cone, spiral, umbrella; Particular materials used therewith formed by a conductive layer on an insulating support
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q3/00—Arrangements for changing or varying the orientation or the shape of the directional pattern of the waves radiated from an antenna or antenna system
    • H01Q3/26—Arrangements for changing or varying the orientation or the shape of the directional pattern of the waves radiated from an antenna or antenna system varying the relative phase or relative amplitude of energisation between two or more active radiating elements; varying the distribution of energy across a radiating aperture
    • H01Q3/2605—Array of radiating elements provided with a feedback control over the element weights, e.g. adaptive arrays
    • H01Q3/2647—Retrodirective arrays
    • A—HUMAN NECESSITIES
    • A63—SPORTS; GAMES; AMUSEMENTS
    • A63B—APPARATUS FOR PHYSICAL TRAINING, GYMNASTICS, SWIMMING, CLIMBING, OR FENCING; BALL GAMES; TRAINING EQUIPMENT
    • A63B24/00—Electric or electronic controls for exercising apparatus of preceding groups; Controlling or monitoring of exercises, sportive games, training or athletic performances
    • A63B24/0021—Tracking a path or terminating locations
    • A63B2024/0053—Tracking a path or terminating locations for locating an object, e.g. a lost ball
    • A—HUMAN NECESSITIES
    • A63—SPORTS; GAMES; AMUSEMENTS
    • A63B—APPARATUS FOR PHYSICAL TRAINING, GYMNASTICS, SWIMMING, CLIMBING, OR FENCING; BALL GAMES; TRAINING EQUIPMENT
    • A63B2225/00—Miscellaneous features of sport apparatus, devices or equipment
    • A63B2225/50—Wireless data transmission, e.g. by radio transmitters or telemetry
    • A—HUMAN NECESSITIES
    • A63—SPORTS; GAMES; AMUSEMENTS
    • A63B—APPARATUS FOR PHYSICAL TRAINING, GYMNASTICS, SWIMMING, CLIMBING, OR FENCING; BALL GAMES; TRAINING EQUIPMENT
    • A63B37/00—Solid balls; Rigid hollow balls; Marbles
    • A63B37/0003—Golf balls
    • A63B37/007—Characteristics of the ball as a whole
    • A63B37/0077—Physical properties
    • A63B37/0088—Frequency
    • A—HUMAN NECESSITIES
    • A63—SPORTS; GAMES; AMUSEMENTS
    • A63B—APPARATUS FOR PHYSICAL TRAINING, GYMNASTICS, SWIMMING, CLIMBING, OR FENCING; BALL GAMES; TRAINING EQUIPMENT
    • A63B43/00—Balls with special arrangements
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
    • G01S13/00—Systems using the reflection or reradiation of radio waves, e.g. radar systems; Analogous systems using reflection or reradiation of waves whose nature or wavelength is irrelevant or unspecified
    • G01S13/74—Systems using reradiation of radio waves, e.g. secondary radar systems; Analogous systems
    • G01S13/82—Systems using reradiation of radio waves, e.g. secondary radar systems; Analogous systems wherein continuous-type signals are transmitted
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
    • G01S13/00—Systems using the reflection or reradiation of radio waves, e.g. radar systems; Analogous systems using reflection or reradiation of waves whose nature or wavelength is irrelevant or unspecified
    • G01S13/88—Radar or analogous systems specially adapted for specific applications

Landscapes

  • Engineering & Computer Science (AREA)
  • Radar, Positioning & Navigation (AREA)
  • Remote Sensing (AREA)
  • Health & Medical Sciences (AREA)
  • General Health & Medical Sciences (AREA)
  • Physical Education & Sports Medicine (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Radar Systems Or Details Thereof (AREA)
  • Geophysics And Detection Of Objects (AREA)

Abstract

A golf ball 10 comprises means 12,18 for re-radiating electromagnetic radiation which is incident on the golf ball, having a non-linear element 18 for summing the frequency components of the incident radiation. A method and apparatus of locating a golf ball having a non-linear element is also provided including means for transmitting electromagnetic radiation having first and second transmitted frequencies f1, f2 and detecting means for detecting electromagnetic radiation at a frequency f1 + f2 when emitted from a location within an angle of 0-4 F steradians. Preferably the frequencies are between 500-2000MHz.

Description

GOLF BALL
The invention relates to golf balls and to methods of, and apparatus for, locating golf balls.
It is a frequent occurrence that a golfer loses his or her golf ball when making a long distance stroke such as a tee shot or a fairway shot. Loss of golf balls during a game results in penalties and delays.
10 Previously, attempts have been made to provide golf balls which are capable of being located more rapidly than by a golfer's manual searching, and to provide corresponding methods and apparatus for detection of such golf balls. A majority rely on detection of a signal emitted by a golf ball, the ball being arranged to emit the signal either independently or in response to an applied signal. Golf ball 15 location based on detection of acoustic signals emitted by the ball (e.g. US 5 447 314, US 5 820 484) has been suggested, as has detection of a characteristic odour to which a golf ball is previously subjected (e.g. US 6 353 386), however more credible suggestions involve detection of electromagnetic (EM) radiation emanating from the golf ball.
Although golf balls incorporating powered EM wave transmitters have been suggested (e.g. published Canadian patent application number 2 087 196), passive golf balls are preferred as they do not require a power supply and are hence of simpler construction and low maintenance. US 5 662 534 and US 5 662 25 533 describe golf balls which reflect EM radiation. However such balls would be difficult to locate because they would not be easily distinguished from other reflectors of EM radiation (e.g. the ground, walls, fences etc). US 4 660 039 discloses a golf ball comprising a conductive stripe which increases the load on a transmitter as the transmitter moves closer to the ball, however the range at which 30 such a ball may be detected is very short because the detection process involves absorption of radiation. US 5 626 531 discloses a ball comprising a resonant circuit which re-radiates EM radiation having a frequency close to the resonant frequency of the circuit. This ball would be difficult to detect because one has to transmit and receive EM waves at the same frequency, resulting in a poor signal
to-noise ratio in detection. A signal received form this ball would be small in comparison to the transmitted signal and to reflections from the surrounding environment. Furthermore this problem cannot be overcome using pulsed operation due to the relatively short distances over which over which golf bail 5 location takes place.
It is an object of the invention to provide a golf ball which, when lost, is capable of being located using EM radiation more reliably and rapidly than has previously been possible.
According to a first aspect of the present invention, this object is achieved by a golf ball comprising means for re-radiating electromagnetic radiation which is incident on the golf ball, characterized in that said means comprises a non-linear element for sum-frequency mixing spectral components of the incident 15 electromagnetic radiation.
When EM radiation having frequencies f,, f2 from a transmitter is incident on a golf ball of the invention, the ball re-radiates EM waves of frequency f,+ f2, this frequency being easily distinguished from transmitted frequencies f, and f2 and 20 harmonics 2f,, 2f2 emitted both by the transmitter and by the golf ball.
Preferably the means for re-radiating EM radiation comprises a fractal antenna, as such an antenna has good radiating properties in relation to its physical size.
Conveniently, the non-linear element may be a diode.
A golf ball according to the first aspect of the invention may be more reliably located than locatable golf balls of the prior art by employing a method according
to a second aspect of the invention, the method comprising the steps of (i) transmitting electromagnetic radiation having first and second transmitted 30 frequencies f,, f2; (ii) providing detecting means for detecting electromagnetic radiation of frequency f, + f2 preferentially when emitted from a position lying within a solid angle Q subtended at the detection means, where O < Q < 4n steradians; and
(iii) carrying out angular scanning of the detecting means to establish the golf ball's angular position with respect to the detecting means.
Good penetration of long grass, bushes etc and a good antenna radiating 5 efficiency are simultaneously achieved if f, and f2 are in the range 500 MHz to 2 GHz. Preferably a characteristic amplitude, frequency or phase modulation is applied to the transmitted radiation; detection of a corresponding modulation in a received 10 signal of frequency f, + f2 then clearly establishes that a golf ball of the invention is nearby. A third aspect of the invention provides apparatus for locating a golf ball according to the first aspect of the invention, the apparatus comprising: 15 (i) means for transmitting electromagnetic radiation having first f, and second f2 transmitted frequencies; and (ii) detecting means for detecting electromagnetic radiation at a frequency f,+f2 preferentially when emitted from a position lying within a solid angle Q subtended at the detection means, where O < Q < 4n steradians.
If f, and f2 are in the range 500 MHz to 2 GHz the apparatus is particularly efficient in locating golf balls of the invention; furthermore the apparatus may be constructed from components which are widely and cheaply available in the mobile telecommunications industry.
Preferably the apparatus further comprises means for applying a characteristic amplitude, frequency or phase modulation to the transmitted frequencies as this allows a golf ball to be detected and located efficiently.
Embodiments of the invention are described below with reference to the accompanying drawings in which Figure 1 shows a cross-section of a golf ball of the invention, Figure 1A shows a non-linear device incorporated within the golf ball of Figure 1, Figure 2 shows a portion of a transmitter apparatus used to locate the golf 10 ball of Figure 1, and Figure 3 shows a portion of a receiver apparatus used to locate the golf ball of Figure 1.
15 Referring to Figure 1, a golf ball according to the invention is indicated generally by 10. The ball 10 comprises a conformal fractal antenna 12 located on the surface 11 of the ball 10. The ball 10 may therefore be formed by retrofitting the antenna 12 to a conventional golf ball. (Alternatively, the antenna 12 may be embedded in the ball.) An alternative golf ball of the invention comprises a half 20 wave antenna, however a fractal antenna is preferred as it provides a good re-
radiated signal strength in relation to its relatively small physical size. Ends 14, 16 of the antenna 12 are connected by a non-linear element 18, which may be diode or any other device able to provide sum-frequency mixing of EM waves at low signal levels when the EM waves are received by the antenna 12. The 25 antenna 12 may need to be impedance-matched to the diode by inclusion of an inductive element between the element 18 and one end of the antenna (i.e. end 14 or end 16). The non-linear element 12 is preferably a chip device integrating a non-linear element with any impedance-matching components that may be required, as this makes for simpler mass-production. Figure 1A illustrates how 30 such a chip device could be connected to the antenna 12.
Referring now to Figure 2, a portion 20 of a transmitter apparatus used to locate the golf ball 10 comprises a CW transmitter oscillator 22 arranged to output a RF signal having a frequency fit = 800 MHz to a frequency or amplitude modulator 24
to generate a modulated transmission signal. The modulator 24 operates to impose a characteristic amplitude, frequency or phase modulation, providing for more reliable detection and location of the golf ball 10. The modulated transmission signal is amplified by an amplifier 26 and filtered by a low pass filter 5 28 (to suppress harmonics) and then passed to a substantially omni-directional antenna, or at least an antenna for emitting EM radiation into a large solid angle.
The transmitter apparatus comprises a second portion like to the portion 20 except that the CW transmitter oscillator of the second portion operates at a frequency f2 = 900 MHz.
To locate the golf ball 10 of Figure 1 when it is lost in long grass, bushes etc. the transmitter apparatus is operated to transmit EM radiation at frequencies of 800 MHz and 900 MHz. (Some low-intensity radiation will also be emitted at 2f, = 1.6 GHz and 2f2 = 1.8 GHz, as well as other harmonics.) The transmitted EM 15 radiation is received by the golf ball 10. The non-linear element 18 and fractal antenna 12 of the golf ball 10 operate to sum-frequency mix, and frequency-
double the received EM radiation so that the ball re-radiates electromagnetic waves principally at frequencies 2f, = 1.6 GHz, f, + f2 = 1.7 GHz and 2f2 = 1.8 GHz. Referring to Figure 3, heterodyne receiving apparatus 30 for detecting re-radiated EM radiation emanating from the golf ball 10 of Figure 1 at a frequency f, + f2 = 1.7 GHz comprises a receiver antenna (not shown), a bandpass filter 31 for suppressing signals at 2f, and 2f2 (i.e. 1.6 GHz and 1.8 GHz) and other unwanted 25 frequencies, and a mixer 33 for mixing a filtered received signal with a signal of frequency fLO =1.7214 GHz from a local oscillator 34. Intermediate frequency (IF) output from the mixer 33 passes to an IF amplifier 35, and then to an IF filter 36 which extracts a signal of frequency from f, + f2 = 21.4 MHz, this signal being detected by a detector 37. Output from the detector 37 may be passed either to a 30 visual display 37 and/or to an audio amplifier 38 to provide visual and/or audible indications of received signal strength.
The receiver antenna is directional, i.e. it receives EM radiation from the golf ball 10 preferentially (i.e. more efficiently) when the ball 10 lies within a solid angle
corresponding to the receiver antenna's main radiation lobe, than when the ball 10 lies outside the solid angle. By operating the transmitter apparatus and carrying out angular scanning of the main radiation lobe of the receiver until a signal having a frequency f'+f2 and the characteristic amplitude, frequency or 5 phase modulation is received, the angular position of the ball 10 may be established as being within the receiver antenna's main radiation lobe. The strength of the received signal at f'+f2 is indicated by the display means and/or an audible signal and provides a measure of the direction of the ball 10 in relation to that of the main radiation lobe of the receiver antenna.
In alternative apparatus of the invention for detecting the golf ball 10, the frequencies fit, f2 may have values other than 800 MHz and 900 MHz. Lower frequencies provide better penetration of grass, bushes etc but result in a lower antenna efficiency. Transmitted frequencies in the range 500 MHz to 2 GHz 15 provide good penetration and a useful signal strength from the ball 10; furthermore these frequencies allow use of components used in mobile communications systems.
In further alternative apparatus of the invention for detecting the golf ball 10, the 20 receiver antenna may be a phased array antenna, allowing electronic rather than mechanical angular scanning.
In still further alternative apparatus of the invention for detecting the golf ball 10, the transmitter oscillators operate pulsed rather than continuously. This is 25 particularly useful if local regulations disallow use of CW transmitted signals of the required intensity.
An apparatus of the invention may comprise a mobile or cellular telephone as transmitting means.
The invention may be applied to finding other objects which may become lost, e.g. a fractal antenna and a non-linear element could be comprised in a key fob to find lost keys, or in other sports balls to find them when they are lost.

Claims (12)

1. A golf ball (10) comprising means (12, 18) for re-radiating electromagnetic radiation which is incident on the golf ball, characterized in that said means 5 comprises a non-linear element (18) for sum-frequency mixing spectral components of the incident electromagnetic radiation.
2. A golf ball according to claim 1 wherein the means for re-radiating incident electromagnetic radiation comprises a fractal antenna (12).
3. A golf ball according to claim 1 or claim 2 wherein the non-linear element is a diode (18).
4. A method of locating a golf ball according to any preceding claim, the method 15 comprising the steps of: (i) transmitting electromagnetic radiation having first and second transmitted frequencies f,, f2; (ii) providing detecting means for detecting electromagnetic radiation of frequency fit + f2 preferentially when emitted from a position lying within a 20 solid angle Q subtended at the detecting means, where O < Q < 4n steradians; and (iii) carrying out angular scannirig of the detecting means to establish the golf ball's angular position with respect to the detecting means.
25
5. A method according to claim 4 wherein the first and second transmitted frequencies are in the range 500 MHz to 2 GHz.
6. A method according to claim 4 further comprising the step of applying a characteristic amplitude, frequency or phase modulation to the transmitted 30 electromagnetic radiation.
l
7. Apparatus for locating a golf ball according to any one of claims 1 to 3, characterized in that the apparatus comprises
(i) means for transmitting electromagnetic radiation having first f, and second f2 transmitted frequencies; and (ii) detecting means (30) for detecting electromagnetic radiation at a frequency f,+f2 preferentially when emitted from a location lying within a solid angle Q subtended at the detection means, where O < Q < 4'T steradians.
8. Apparatus according to claim 7 wherein the first and second transmitted frequencies are in the range 500 MHz to 2 GHz.
9. Apparatus according to claim 7 further comprising means for applying a characteristic amplitude, frequency or phase modulation to the transmitted electromagnetic radiation.
15
10. Apparatus according to claim 7 wherein the means for transmitting electromagnetic radiation is a mobile telephone.
11. A golf ball substantially as hereinbefore described and illustrated in Figures 1 and 1A.
12. Apparatus for locating the golf ball of claim 10, the apparatus being substantially as hereinbefore described and illustrated in Figures 2 and 3.
GB0227063A 2002-11-20 2002-11-20 Golf ball locating system Withdrawn GB2395438A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB0227063A GB2395438A (en) 2002-11-20 2002-11-20 Golf ball locating system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB0227063A GB2395438A (en) 2002-11-20 2002-11-20 Golf ball locating system

Publications (2)

Publication Number Publication Date
GB0227063D0 GB0227063D0 (en) 2002-12-24
GB2395438A true GB2395438A (en) 2004-05-26

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Family Applications (1)

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2004067109A2 (en) * 2003-01-17 2004-08-12 Radar Golf, Inc. Apparatuses, methods and systems relating to findable golf balls
US7691009B2 (en) 2003-09-26 2010-04-06 Radar Golf, Inc. Apparatuses and methods relating to findable balls
US7766766B2 (en) 2003-09-26 2010-08-03 Radar Corporation Methods and apparatuses relating to findable balls
US11892537B1 (en) 2022-05-10 2024-02-06 Ballocalor LLC Golf ball locating nonlinear radar system employing a snowflake nonlinear passive tag and associated method(s)

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1197765A (en) * 1966-12-15 1970-07-08 Tech Et D Entpr S Generales So Radio System for the Identification of Movable Bodies.
GB1543155A (en) * 1975-05-02 1979-03-28 Nat Res Dev Transponders
GB1574417A (en) * 1975-11-10 1980-09-03 Sperry Corp Navigation systems
US4471344A (en) * 1980-10-09 1984-09-11 Ici Americas Inc. Dual frequency anti-theft system
US4700179A (en) * 1982-04-12 1987-10-13 Ici Americas Inc. Crossed beam high frequency anti-theft system
GB2306080A (en) * 1995-10-10 1997-04-23 Roke Manor Research Detection systems
US5626531A (en) * 1996-02-02 1997-05-06 Tee To Green Inc. Golf ball with tag, and detecting system

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1197765A (en) * 1966-12-15 1970-07-08 Tech Et D Entpr S Generales So Radio System for the Identification of Movable Bodies.
GB1543155A (en) * 1975-05-02 1979-03-28 Nat Res Dev Transponders
GB1574417A (en) * 1975-11-10 1980-09-03 Sperry Corp Navigation systems
US4471344A (en) * 1980-10-09 1984-09-11 Ici Americas Inc. Dual frequency anti-theft system
US4700179A (en) * 1982-04-12 1987-10-13 Ici Americas Inc. Crossed beam high frequency anti-theft system
GB2306080A (en) * 1995-10-10 1997-04-23 Roke Manor Research Detection systems
US5626531A (en) * 1996-02-02 1997-05-06 Tee To Green Inc. Golf ball with tag, and detecting system

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2004067109A2 (en) * 2003-01-17 2004-08-12 Radar Golf, Inc. Apparatuses, methods and systems relating to findable golf balls
WO2004067109A3 (en) * 2003-01-17 2005-05-19 Radar Golf Inc Apparatuses, methods and systems relating to findable golf balls
US8002645B2 (en) 2003-01-17 2011-08-23 Radar Corporation Apparatuses, methods and systems relating to findable golf balls
US8425350B2 (en) 2003-01-17 2013-04-23 Rf Corporation Apparatuses, methods and systems relating to findable golf balls
US7691009B2 (en) 2003-09-26 2010-04-06 Radar Golf, Inc. Apparatuses and methods relating to findable balls
US7766766B2 (en) 2003-09-26 2010-08-03 Radar Corporation Methods and apparatuses relating to findable balls
US8758166B2 (en) 2003-09-26 2014-06-24 Rf Corporation Apparatuses and methods relating to findable balls
US9592424B2 (en) 2003-09-26 2017-03-14 Topgolf International, Inc. Apparatuses and methods relating to findable balls
US11892537B1 (en) 2022-05-10 2024-02-06 Ballocalor LLC Golf ball locating nonlinear radar system employing a snowflake nonlinear passive tag and associated method(s)

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Publication number Publication date
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