发明名称 | Sign detection in multi-dimensional signal measurements | ||
摘要 | Systems, methods, circuits and computer-readable mediums are disclosed for sign detection in multi-dimensional signal measurements. In some implementations, orthogonally oriented antennas are configured to generate signals in response to a magnetic field, where the signals correspond to components of magnetic field vectors in space. A circuit is coupled to the antennas and configured to: determine polarities of the signals based on phase measurements between the signals; reduce a possible number of magnetic field vector interpretations based on the determined polarities of the signals; reduce a possible number of angles or angle differences between the magnetic field vectors based on the reduced possible number of magnetic field vector interpretations; compare the reduced possible number of angles or angle differences to predetermined angle or angle differences; and detect a relay attack based on results of the comparing. | ||
申请公布号 | US9355509(B1) | 申请公布日期 | 2016.05.31 |
申请号 | US201414560713 | 申请日期 | 2014.12.04 |
申请人 | Atmel Corporation | 发明人 | Blatz Werner |
分类号 | G07C9/00 | 主分类号 | G07C9/00 |
代理机构 | Fish & Richardson P.C. | 代理人 | Fish & Richardson P.C. |
主权项 | 1. A system comprising: orthogonally oriented antennas configured to generate signals in response to a magnetic field, where the signals correspond to components of magnetic field vectors in space; a circuit coupled to the antennas and configured to: determine polarities of the signals based on phase measurements between the signals;reduce a possible number of magnetic field vector interpretations based on the determined polarities of the signals;reduce a possible number of angles or angle differences between the magnetic field vectors based on the reduced possible number of magnetic field vector interpretations;compare the reduced possible number of angles or angle differences to predetermined angle or angle differences; anddetect a relay attack based on results of the comparing. | ||
地址 | San Jose CA US |