Apparatuses, methods and systems relating to findable golf balls
View Patent ↗Golf ball locators and components of such locators and methods of operating such locators and processing signals within such locators. In one aspect of the inventions described herein, an exemplary method of initializing a golf ball locator includes receiving received RF signals while also transmitting signals used to locate balls and determining a parameter representative of received signal strength of the received RF signals and setting a threshold to determine when subsequent received signals are to cause an indication of golf ball detection. In another aspect of this disclosure, the golf ball locator is a handheld unit having a volume of less than about 150 inches cubed and includes a transmitter, a transmit antenna, a receiver, a receive antenna and a processor coupled to the transmitter and to the receiver, and the handheld unit achieves a signal isolation, between a second harmonic of a transmitted signal from the transmitter and the receiver's received signal, of greater than about 130 to 160 dB. Other aspects are also described.
1. A method of locating a golf ball with a handheld golf ball detector having a transmitter and a receiver, the method comprising:
modulating a carrier to provide a binary phase shift keyed (BPSK) modulated signal, the modulation comprising a pseudorandom binary sequence (PN) modulated on the carrier;
shielding the receiver from the transmitter;
transmitting with the transmitter the BPSK modulated signal in transmitted pulses to locate a golf ball having an RF (radio frequency) circuit;
receiving with the receiver a received signal from the golf ball, wherein the received signal is a harmonic of the transmitted pulses and wherein the received signal was despread by the golf ball's RF circuit.
2. A method as in claim 1 wherein the harmonic is a 2 times harmonic and wherein a single crystal is used to generate a reference frequency for both the transmitting and the receiving.
3. A handheld locator comprising:
a housing;
a modulator, within the housing and coupled to the signal source, the modulator to modulate a pseudorandom binary sequence (PN) on the signal source using binary phase shift keying (BPSK) modulation to produce a BPSK modulated signal;
a transmitter coupled to the modulator to transmit the BPSK modulated signal in transmitted pulses to locate an object having an RF (radio frequency) circuit, the transmitter being within the housing;
a receiver within the housing, the receiver to receive, as a received signal, a harmonic of the transmitted pulses, wherein the receiver is shielded from the transmitter and wherein the received signal was despread by the object's RF circuit.
4. A handheld locator as in claim 3 further comprising:
a frequency source coupled to the transmitter and to the receiver, the frequency source generating the signal source for the modulator and generating a reference frequency for use by the receiver, and wherein the harmonic is a 2 times harmonic.