METHOD FOR ADAPTING DECAMETER RADIO COMMUNICATION ACCORDING TO THE WIDTH OF THE SPECTRUM OF TRANSMITTED SIGNALS Russian patent published in 2023 - IPC H04L1/00 

FIELD: ionospheric communication systems.

SUBSTANCE: all the necessary data for operation are entered in advance, then the communication receiver is turned on, the quality of the communication channel is periodically measured and compared with an acceptable level, data exchange on new adaptation parameters is performed and the communication channel is switched to new adaptation parameters, the spatial spectrum of interference is estimated at each of the reserve frequencies, the average parameters of the communication channel at the current time are calculated, the power of the received signal at the communication frequency is measured, the actual signal attenuation coefficient by the D-ionosphere layer based on the power forecast is calculated, the absorption coefficients for all reserve communication frequencies are calculated, the values of the expected power of the received signal are specified, the forecast data is loaded into the simulator of the communication channel at backup frequencies, the power values of the received signal are specified, the characteristics of the spatial spectrum of interference, in all permissible modes of operation of the data transmission modem, the signal of the used data transmission modem transmitting the text data sequence is passed through the simulator, errors are calculated in the test sequence on its length, on the basis of which the list of reserve frequencies is ranked and the data is recorded in the form of a ranked list of reserve frequencies on the carrier in a machine-readable form. For each of the operating and reserve frequencies, the path parameters are determined, the phase paths are measured and the characteristics of the ionosphere are determined, and, taking into account the possible values of the bandwidth of the transmitted signals, service messages are generated containing information on the assignment of the operating frequency of the radio link.

EFFECT: increasing the noise immunity of receiving radio signals.

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