发明名称 Access control system with limited evaluation of code and distance information
摘要 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.
申请公布号 US2004189511(A1) 申请公布日期 2004.09.30
申请号 US20040793720 申请日期 2004.03.05
申请人 GILA JANOS;KONRAD WOLFGANG 发明人 GILA JANOS;KONRAD WOLFGANG
分类号 G07C9/00;(IPC1-7):G01S13/76;G01S13/84 主分类号 G07C9/00
代理机构 代理人
主权项
地址