Communications: directive radio wave systems and devices (e.g. – Radar transponder system
Reexamination Certificate
2005-09-13
2005-09-13
Sotomayor, John B. (Department: 3662)
Communications: directive radio wave systems and devices (e.g.,
Radar transponder system
C342S044000, C342S051000, C340S005200
Reexamination Certificate
active
06943725
ABSTRACT:
An access control system for an object, particularly a motor vehicle, comprises at least one base station with a transceiver device that transmits a wideband modulated interrogation signal, at least one transponder that has a modulation device, in order to modulate an auxiliary carrier signal, the frequency of which is changed between an infinite number of frequency positions, onto an interrogation signal received at a distance from the base station and reflect it as a code-modulated response signal, and an evaluation device that is connected after the transceiver device and that evaluates the response signal in sidebands of the changed frequency positions, with respect code and distance.
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“Implementation of reconfigurable transceiver based on digital IF for multiple wideband CDMA signals”, Jae Ho Jung; Kwang Chun Lee; Deuk Soo Lyu; Vehicular Technology Conf., VTC 2003-Spring. The 57th IEEE Semiannual vol. 4, Apr. 22-25, 2003 P(s):2842-2846.
Gila Janos
Konrad Wolfgang
Baker & Botts L.L.P.
Siemens Aktiengesellschaft
Sotomayor John B.
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