Detector of uplink frequencies with feedback

摘要

An apparatus and method for detection of uplink frequencies from a mobile device, such as a cell phone, may be used as an alarm for people not to use their mobile device, or may signal security personnel when an unauthorized mobile device is being used. The apparatus and method may measure the uplink frequency band and use feedback with the downlink frequencies to gain a better reading of the distance the mobile device being used is from the detection device The apparatus and method has more precision of distance compared to conventional detectors, as the uplink RF power of a mobile device changes depending where it's located from the cell tower transmitting the downlink data to the mobile device monitored.

主权项

1. A device to detect use of a mobile device without altering an uplink signal and a downlink signal associated with the use of the mobile device, comprising:
at least one antenna for detecting a mobile device uplink signal and for detecting a cell tower downlink signal; a plurality of uplink filters and uplink amplifiers for enhancing the mobile device uplink signal detected by the at least one antenna; an uplink power detector for detecting the enhanced mobile device uplink signal; a plurality of downlink filters and downlink amplifiers for enhancing the cell tower downlink signal; a downlink power detector for detecting the enhanced cell tower downlink signal; and a logic circuit comparing an output from the uplink power detector with an output from the downlink power detector to determine whether an unauthorized mobile device is being used in a predefined area.