发明名称 |
Method of and a system for surveillance of an environment utilising electromagnetic waves |
摘要 |
A system and method for surveillance of a physical environment. May utilise already installed equipment, such as WLAN for surveillance purposes. This makes the system cost effective to implement. Transmits a first and a second signal. The signals are received by receivers, and the received signals are compared in order to detect a difference in the signals, the difference being caused by a physical change present in the signal path between transmitter(s) and receiver(s). Does not require high spectral purity of the transmitted signals or heavy computations in order to establish that a change has occurred. Suitable for intruder alarm purposes.
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申请公布号 |
US7088236(B2) |
申请公布日期 |
2006.08.08 |
申请号 |
US20030602921 |
申请日期 |
2003.06.25 |
申请人 |
IT UNIVERSITY OF COPENHAGEN |
发明人 |
SOERENSEN JOHN ERIK AASTED |
分类号 |
G08B1/08;G01V3/12;G08B13/24;G08B25/08 |
主分类号 |
G08B1/08 |
代理机构 |
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代理人 |
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主权项 |
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