METHOD OF JAMMING-RESISTANT INFORMATION TRANSMISSION BASED ON AMPLITUDE MANIPULATION Russian patent published in 2023 - IPC H04L27/02 

FIELD: radio engineering.

SUBSTANCE: invention is intended for use in jamming-resistant radio communication systems. In the method of jamming-resistant information transmission based on amplitude manipulation, the bit stream is additionally divided into information blocks of more than four bits, and the time cycle of transmitting the information block is divided into two time subcycles; the list of operating frequencies is formed based on the requirements for the permissible value of the minimum frequency spacing between neighbouring operating frequencies, and the number of operating frequencies is set equal to the number of combinations of information blocks, a unique combination of an information block is assigned to each operating frequency, a harmonic oscillation is generated with a nominal frequency equal to the nominal operating frequency corresponding to the transmitted combination of the information block. In the first time subcycle, the generated harmonic oscillation is emitted, in the second time subcycle, transmission is not carried out. When receiving a radio signal at all the operating frequencies in the first time subcycle, operating frequencies are selected with the level of the received signal exceeding the specified threshold value of amplitude detection, after which, from the selected operating frequencies, operating frequencies with the maximum difference in the levels of the received signal on in the first and second time subcycles, if two or more operating frequencies are determined, then the formation of an information block and its transmission to the message recipient is not carried out, but a decision is made to replace the list of operating frequencies, otherwise, based on the selected operating frequency, an information block is formed and transmitted to the message recipient.

EFFECT: improved noise immunity of signal reception under exposure to barrage noise and polyharmonic interference concentrated in a dedicated operating frequency band.

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