Pulse or digital communications – Repeaters – Testing
Patent
1994-09-13
1997-02-25
Tse, Young T.
Pulse or digital communications
Repeaters
Testing
342 42, H04B 726, G01S 1378
Patent
active
056065744
ABSTRACT:
A first mobile unit identification system having a interrogator and responder. The interrogator transmits a given magnitude of a spread spectrum coded signal in standby mode. The responder receives the spread spectrum coded signal and when the magnitude of received signal exceeds a given value, it reflects the transmitted spread spectrum coded signal with ID code when the magnitude of received signal exceeds the given value. The interrogator receives this and then, transmits data to the responder with amplitude modulating the spread spectrum coded signal with the data. The responder detects by amplitude demodulation and stores the detected data. The interrogator may transmit a mode change code. The responder may transmit an end code after transmission of a data train. A second interrogator informs the responder of the standby mode thereof by amplitude-modulated signal having a given cycle. A second responder judges whether or not the second interrogator is in standby mode by detecting the cycle and sends a communication requesting signal Q to the second responder and then, transmits ID code. In response to the signal Q, tile second interrogator transmits a signal having a fixed magnitude. A method of modulating for the mobile unit identifying system is also disclosed.
REFERENCES:
patent: 3981011 (1976-09-01), Bell, III
patent: 4862176 (1989-08-01), Voles
patent: 5055659 (1991-10-01), Hendrick
patent: 5245346 (1993-09-01), Nishimura et al.
patent: 5444448 (1995-08-01), Schuermann et al.
Adachi Naoki
Hasegawa Makoto
Hirabayashi Hirohide
Mimura Masahiro
Namura Yasuaki
Matsushita Electric - Industrial Co., Ltd.
Tse Young T.
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