Device and method for shielding mobile phone signal by time division synchronous control

Abstract

The invention provides a device and method for shielding a mobile phone signal by time division synchronous control. The shielding device comprises a synchronous signal receiving antenna, a time division synchronous detection unit, a time division synchronous control unit and a shielding signal generation circuit which are sequentially connected, wherein the time division synchronous detection unit acquires a carrier with a synchronous signal after processing a space time division signal and acquires a downlink signal emission time period and an uplink signal receiving time period of a mobile communication base station according to the synchronous signal; in the downlink signal emission time period, the time division synchronous control unit switches on the shielding signal generation circuit; and in the uplink signal receiving time period, the time division synchronous control unit switches off the shielding signal generation circuit. The shielding device can accurately detect the downlink signal emission time period and the uplink signal receiving time period of the mobile communication base station; in the downlink signal emission time period, the device for shielding the mobile phone signal is switched on to interfere with a downlink signal; and in the uplink signal emission time period, the device for shielding the mobile phone signal is switched off to avoid the interference with the base station.

Description

technical field [0001] The invention relates to a mobile phone signal shielding device, in particular to a mobile phone signal shielding device and a shielding method of a time-division communication system. Background technique [0002] The existing GSM frequency division system mobile phone signal jammer comprises a sawtooth wave generating circuit, a voltage-controlled oscillator, a GSM frequency band filter, a signal amplifier and a transmitting antenna connected in sequence. The sawtooth wave generating circuit generates a sawtooth wave voltage with the lowest voltage V1, the highest voltage V2, and a period of f (f>100KHz). The sawtooth wave voltage controls the voltage control terminal of the voltage-controlled oscillator, thereby generating a frequency change from f1 to f2 The frequency sweep signal is filtered by the filter, and then amplified by the signal amplifier to obtain the required power and then transmitted through the transmitting antenna. The frequenc...

AI Technical Summary

Problems solved by technology

[0004] In order to solve the technical problem of uplink interference caused by shielding time-division communication system signals in the prior art, the present invention provides a time-division synchronous control mobile phone signal jammer and its method. The mobile phone signal jammer can accurately detect the downlink signal transmission of a mobile communication base station Time period and uplink signal receiving period, turn on the mobile phone signal jammer during the downlink signal transmission period to interfere with the downlink signal, and turn off the mobile phone signal jammer during the uplink signal period to avoid interference to the base station

Images