METHOD FOR ACTIVE RETRANSLATION OF RADIO-FREQUENCY IDENTIFICATION SIGNALS OF UHF RANGE Russian patent published in 2023 - IPC H01Q1/38 H01Q21/24 G06K19/12 

FIELD: radio engineering.

SUBSTANCE: invention relates to the field of radio engineering, and more specifically, to radio frequency identification systems (hereinafter – RFID); it can be used for UHF-range systems with passive and semi-passive tags. At the same time, provision of a possibility of confident reading of radiation through metal walls can allow, within the framework of a single reading session, to carry out automated inventory not only of objects in a room, where a metal container is located, but also directly inside it (if necessary), using for these purposes an ordinary RFID data collection terminal (hereinafter – DCT), including portable one. This may be useful (for example, when using tags with code encryption) for automated inventory of special-purpose objects, such as weapon safes and rooms in military units, bank vaults, etc. In this way, it is possible to carry out automated inventory of transport logistics facilities, for example, closed sea and land cargo containers, refrigerators, etc., including by flying around a site, where they are located, by a radio-controlled drone with DCT on board. Such practical applications make such a technology of inventory of objects inside blind metal containers in demand to a large extent. Unevenness in the resulting superposition of volumetric interference patterns of an electromagnetic field inside a container with metal walls is minimized by organization of active retranslation of radio frequency identification signals, using an antenna array inside the specified container, with creation of at least three types of amplitude-phase distribution on ports of elements of such an array, namely, one type in each from a series of consecutive time windows forming a single reading session, including in conditions of coating of inner walls of the container with radio-absorbing material.

EFFECT: maximization of a number of confidently readable tags identifying objects inside a container with metal walls, including in conditions of strong interference of an electromagnetic field.

80 cl, 7 dwg