METHOD OF CONTINUOUS MONITORING OF SCREENED STRUCTURE STATE Russian patent published in 2019 - IPC G12B17/00 

FIELD: information protection.

SUBSTANCE: invention relates to protection of information by continuous monitoring of the state of screened structures and is intended to increase the level of protection of objects with which work is carried out in said structures. Method for continuous monitoring of the state of a shielded structure involves reception and subsequent evaluation of the obtained signal, which is carried out using a receiver with a signal level detector and receiving antennae. At that, it differs from the prototype in that the receiving antennae in the required quantity are placed outside the screened structure opposite to places of the most probable leakage of the signal. Receiving antennae are selected based on the operating frequency range of the article to be operated in the shielded structure. Prior to installation of receiving antennas, receiving channel is calibrated, signal level (power) is measured, as well as theoretical calculation of signal attenuation in free space. During operation with article in closed shielded structure, signal level change from structure elements of shielded structure is continuously monitored by receiving antennas and receiver with signal level recorder. In case the signal received by the n-th receiving channel exceeds the threshold value set in the signal level logger for the given receiving channel, at the output of the latter, a trigger signal is generated, which activates operation of one or more terminal devices informing on the fact of signal leakage and providing termination of the signal generation and emission or its masking.

EFFECT: design of a method for continuous monitoring of the state of a shielded structure, which enables to detect and prevent the leakage of electromagnetic fields from the article and its components during operation of the shielded structure, operation with which is carried out in it.

1 cl, 2 dwg