Tag tracking
First Claim
1. A racing transmitter for use in a system used to track one or more competitors or equipment in a race event, the racing transmitter comprising:
- a clock for generating a clock signal;
a generator operable to generate a transmission signal using the generated clock signal, the transmission signal including a temporal sequence of at least three frequency components having a frequency spacing therebetween; and
an output operable to transmit the transmission signal;
wherein said generator is arranged so that the duration of the frequency components having the greatest frequency separation therebetween is longer than the duration of the or each other frequency component in the sequence.
2 Assignments
0 Petitions
Accused Products
Abstract
A tracking system is described in which a mobile tag having an unknown position is tracked in space over time. The mobile tag transmits a signal comprising a sequence of frequency components at different frequencies. The transmitted signal is received at each of a plurality of receivers, each having a known location. Each of the receivers measures the phase of each of the tones and the phase measures are passed to a central processing unit. The central processing unit then uses the determined phase measures to determine the position of the tag at the time of the transmission. Various novel tag arrangements are described which generate new transmission signals which improve accuracy and reliability of the position measurements obtained.
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Citations
27 Claims
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1. A racing transmitter for use in a system used to track one or more competitors or equipment in a race event, the racing transmitter comprising:
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a clock for generating a clock signal;
a generator operable to generate a transmission signal using the generated clock signal, the transmission signal including a temporal sequence of at least three frequency components having a frequency spacing therebetween; and
an output operable to transmit the transmission signal;
wherein said generator is arranged so that the duration of the frequency components having the greatest frequency separation therebetween is longer than the duration of the or each other frequency component in the sequence. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 16, 21, 23)
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13. A racing transmitter for use in a system used to track one or more competitors or equipment in a race, the racing transmitter comprising:
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a clock for generating a clock signal;
a generator operable to generate pulses of a transmission signal using the generated clock signal, each pulse of transmission signal including a sequence of a plurality of frequency components having a frequency spacing therebetween; and
an output operable to transmit the pulses of transmission signal;
wherein said generator is arranged to generate pairs of said pulses of transmission signal and wherein said output is operable to transmit said pairs of pulses so that a time interval between the pulses of a pair is less than a time interval between adjacent pairs of pulses. - View Dependent Claims (17, 18, 22, 26)
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14. A racing transmitter for use in a system used to track one or more competitors or equipment in a race, the racing transmitter comprising:
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a clock for generating a clock signal;
a generator operable to generate pulses of a transmission signal using the generated clock signal, each pulse of transmission signal including a sequence of a plurality of frequency components having a frequency spacing therebetween; and
an output operable to transmit the pulses of transmission signal;
wherein said generator is operable to generate pulses of transmission signal including first and second temporal sequences of frequency components, wherein the frequency components in the first temporal sequence are different to the frequency components in the second temporal sequence, wherein the frequency components in the first temporal sequence are the same within said pulses and wherein the frequency components in the second temporal sequence are different in adjacent said pulses. - View Dependent Claims (19, 20, 24, 25, 27)
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15. A racing transmitter for use in a system used to track one or more competitors or equipment in a race event, the racing transmitter comprising:
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a clock for generating a clock signal;
a generator operable to generate a transmission signal using the generated clock signal, the transmission signal including a temporal sequence of different frequency components including at least one start frequency component at least one middle frequency component and at least one end frequency component; and
an output operable to transmit the transmission signal;
wherein said generator is arranged so that the duration of the at least one middle frequency component is longer than the duration of the at least one start frequency component and the at least one end frequency component.
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Specification