摘要 |
<p>A system for detecting and locating illicit cellular telephone use within a facility includes an array of radio frequency (RF) receivers, each receiver being placed in a predetermined location in the facility, and a central server, the receivers being in electrical communication with the central server. The server commands a group or groups of receivers to tune to a frequency of interest and to perform detailed sample rate measurements of the RF signal level received at the receivers. The array of receivers is organized into a plurality of measurement areas covering widely separated areas of the facility or different buildings of the facility, and the plurality of receivers of a measurement area is organized into a plurality of measurement groups covering areas of approximately uniform RF propagation conditions. Each receiver scans a frequency band of interest non-synchronously and independently of the other receivers in the array. Also, each receiver is preferably a direct-conversion receiver.</p> |
申请人 |
EDO CORPORATION;OLBERS, ROBERT, L.;LIU, YUAN-MIN;NESKY, MARK, S.;PLECAS, CRAIG, A.;REYES, JOSEPH, L.;KEIMIG, JOHN;HORVATH, KENJI, C. |
发明人 |
OLBERS, ROBERT, L.;LIU, YUAN-MIN;NESKY, MARK, S.;PLECAS, CRAIG, A.;REYES, JOSEPH, L.;KEIMIG, JOHN;HORVATH, KENJI, C. |