High power moving object identification system
First Claim
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1. A system for identifying a moving object comprising:
- an interrogator transmitting an RF transmission signal indicative of transmission data;
a transponder adapted to be mounted on said moving object for transmitting an RF answer signal indicative of answer data available at said transponder to said interrogator upon receiving said transmission signal, said transponder including energy storing means which stores energy from said RF transmission signal for powering said transponder;
said interrogator comprising;
coding means for providing, from said transmission data, a coded signal in which one logical level of said transmission data is represented by a first series of binary digits and another logical level of said transmission data is represented by a second series of binary digits;
a carrier wave generator for generating a carrier wave; and
a modulator for modulating said carrier wave by said coded signal in an amplitude shift keying (ASK) technique to give an ASK modulated signal in which a binary digit "1" of said coded signal is represented by a maximum amplitude of said carrier wave and a binary digit "0" is represented by the absence of said carrier wave, said ASK modulated signal defining said transmission signal;
said transponder comprising;
a demodulator for demodulating said ASK modulated signal into a demodulated signal having a sequence of pulses of varying width; and
decoding means for decoding said demodulated signal into said transmission data;
wherein, said coding means of the interrogator is configured to provide each said first and second series of binary digits such that a number of binary digit "1" in each series of binary digits is greater than a number of the binary digit "0" in each series of binary digits.
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Abstract
A moving object identification system with a novel coding scheme achieves 75% transmission efficiency. With this system, a transmittable range is expanded. Logical value assignment for residual resonant oscillations in a residual resonant signal is performed by comparing a residual frequency with a threshold frequency. A wave energy reduction of an ASK modulated signal is used to decrease the energy of the signal in order to distinguish similar residual frequencies in the case of extremely close communication. Reliability of Write/Read instructions in this system is improved by employing a test writing before an actual writing and a voltage monitoring device.
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Citations
12 Claims
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1. A system for identifying a moving object comprising:
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an interrogator transmitting an RF transmission signal indicative of transmission data; a transponder adapted to be mounted on said moving object for transmitting an RF answer signal indicative of answer data available at said transponder to said interrogator upon receiving said transmission signal, said transponder including energy storing means which stores energy from said RF transmission signal for powering said transponder; said interrogator comprising; coding means for providing, from said transmission data, a coded signal in which one logical level of said transmission data is represented by a first series of binary digits and another logical level of said transmission data is represented by a second series of binary digits; a carrier wave generator for generating a carrier wave; and a modulator for modulating said carrier wave by said coded signal in an amplitude shift keying (ASK) technique to give an ASK modulated signal in which a binary digit "1" of said coded signal is represented by a maximum amplitude of said carrier wave and a binary digit "0" is represented by the absence of said carrier wave, said ASK modulated signal defining said transmission signal; said transponder comprising; a demodulator for demodulating said ASK modulated signal into a demodulated signal having a sequence of pulses of varying width; and decoding means for decoding said demodulated signal into said transmission data; wherein, said coding means of the interrogator is configured to provide each said first and second series of binary digits such that a number of binary digit "1" in each series of binary digits is greater than a number of the binary digit "0" in each series of binary digits. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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Specification