RU2014111576A - METHOD FOR IMPROVING INTERFERENCE OF DATA TRANSMISSION BY SHORT-WAVE RADIO CHANNEL IN DEPARTMENTAL COMMUNICATION SYSTEM - Google Patents

Abstract

A method for improving the noise immunity of data transmission over a short-wave (KB) radio channel in a departmental communication system (BCC), consisting of N of the same type of KB transceiving radio communication nodes (URS), according to which, when conducting direct simplex radio communication between each two URS, one of which is URS1 with conventional serial number 1 is central, and the other is URSj, with conventional serial number j = 2, 3, 4, ..., N is peripheral, in the corresponding azimuthal radio direction, conventionally referred to as URS1↔URCj or URSj↔URCl, n and the optimum operating frequency (ORF) corresponding to this radio direction, conventionally referred to as OPCH (1↔j) or OPCH (j↔1), where the ↔ sign indicates the symmetry of the radio direction when transmitting the radio signal as in the direction from URS1 to URSj (URSl → URSj), and in the opposite direction - from URSj to URS1 (URSj → URS1), using the same ORC value, on the URS transmitting binary information, it is encoded with a noise-resistant code and using a transmitter connected to a transmitting antenna, whose radiation pattern accordingly complies with the propagation conditions of radio waves in the azimuthal direction, they emit a radio signal in the ORF with the necessary power and speed of information transfer, and on the URS receiving information, spatial transmission of the transmitted radio signal reflected from the ionosphere is performed by its antenna-receiving complex (AIC), one of which is selected for reception radiation patterns which corresponds to the conditions of propagation of radio waves in the azimuthal radio direction, after which the received signal is subjected to further

Claims (2)

A method for improving the noise immunity of data transmission over a short-wave (KB) radio channel in a departmental communication system (BCC), consisting of N of the same type of KB transceiving radio communication nodes (URS), according to which, when conducting direct simplex radio communication between each two URS, one of which is URS1 with conventional serial number 1 is central, and the other is URSj, with conventional serial number j = 2, 3, 4, ..., N is peripheral, in the corresponding azimuthal radio direction, conventionally referred to as URS1↔URCj or URSj↔URCl, n and the optimum operating frequency (ORF) corresponding to this radio direction, conventionally referred to as OPCH (1↔j) or OPCH (j↔1), where the ↔ sign indicates the symmetry of the radio direction when transmitting the radio signal as in the direction from URS1 to URSj (URSl → URSj), and in the opposite direction - from URSj to URS1 (URSj → URS1), using the same ORC value, on the URS transmitting binary information, it is encoded with a noise-resistant code and using a transmitter connected to a transmitting antenna, whose radiation pattern accordingly complies with the propagation conditions of radio waves in the azimuthal direction, they emit a radio signal in the ORF with the necessary power and speed of information transfer, and on the URS receiving information, spatial transmission of the transmitted radio signal reflected from the ionosphere is performed by its antenna-receiving complex (AIC), one of which is selected for reception radiation patterns which corresponds to the conditions of propagation of radio waves in the azimuthal radio direction, after which the received signal is subjected to further filtering, demodulation and decoding with the detection and correction of erroneously received binary symbols, while adapting the parameters of each URS according to the operating frequency used, information transfer rate, radiation power, as well as the spatial orientation of the APC radiation pattern and the transmit antenna pattern, depending on conditions of propagation of radio waves when working on each of the N-1 azimuthal radio directions URSl↔URСj, operational probes are conducted on the central URS ionosphere, according to the results of each session, they make up the frequency schedule of the BCC for the next selected time interval of the BCC operation, indicating the necessary data to change the hardware settings of each URS, characterized in that in all URS the VSS continuously and synchronously form the same clock sequences, cyclic and vertical pulses, the clock pulse sequence determines the moments following the respective clock intervals ΔT _i? T duration each cycle sequence x pulses define respective moments of cyclic repetition intervals? T _tsr, each lasting $$\Delta T_c={\displaystyle \sum _{i=\mathrm{one}}^N\Delta T_i=N\cdot \Delta T}$$

, where i = 1, 2, 3, ..., N, determines the sequence number of the time position of each clock interval in each cycle interval, the sequence of frame pulses, determine the moments of the corresponding frame intervals, each of duration $$\Delta T_{\mathrm{to}}={\displaystyle \sum _{r=\mathrm{one}}^L\Delta T_{cr}=L\cdot \Delta T_c}$$

, where r = 1, 2, 3, ..., L, determines the sequence number of the time position of each cycle interval in each frame interval, within which the parameters of the hardware of all the BSS URS set in accordance with the frequency schedule are kept constant, in-phase formation by all The URS of sequences of clock, cyclic, and frame pulses provide due to the receipt by each URS of radio signals of a single exact time, while in each cycle interval ΔT _cr from each URSi with serial number i, which coincides with the order With the number of the clock interval ΔТ _i , it is possible to transmit only one data packet in the form of a radiogram (RG) of a fixed duration T _PГ < _ΔТ / 2 addressed to the receiver of URSj with serial number j = 2, 3, 4, ..., N for j ≠ i, along the corresponding one of the N-1 azimuthal directions of direct radio communication, and in time, the beginning of the radiation from the RRSi from the URSi is combined with the beginning of the corresponding clock interval ΔT _i , with each other URSk with the serial number k = 2, 3, 4, ..., N at k ≠ i, k ≠ j receive the transmitted GR with identification of its address part, and e if the RG is addressed to another URS - URSj, then it is relayed to the recipient within the same clock interval ΔТ _i according to the corresponding radio direction of the direct radio link URSk↔URСj to the corresponding OPC (k↔j), provided that the percentage of erroneously received binary characters in the received The RG does not exceed the established threshold value, according to the results of reception at different frequencies in the electronic memory of the URSj, in addition to the RG sample taken in the main azimuthal radio direction (URSi↔URSj), Q of other RG samples are also recorded, where Q≤N-2, p signals from the relaying URS, corresponding to other Q directions, after which out of all Q + 1 WG samples received at URSj, one of the WG samples in which no errors were detected is selected as the received radiogram, while if in all Q + 1 WG samples errors are detected and the Q value is an even number, then all the samples of the radiograms are combined in time and the resulting RG is obtained by the method of discrete elementwise addition of all the RG samples, which is considered as the accepted RG, if the Q value is an odd number, then the result A generating RG is obtained in a similar way, but with the exception from the process of elementwise discrete addition of RG samples of one of the Q + 1 RG samples with the largest number of erroneously received characters. 2. The method according to p. 1, characterized in that the session of operational sounding of the ionosphere on the central URS is carried out in the second half of each personnel interval T _to in parallel with its main job of transmitting and receiving RG, during which for each azimuthal radio direction URSi↔URСj from of the total number M = N (N-1) / 2 possible radio directions of the direct air force between each two URS with different serial numbers, assign one value of the OPCH (i↔j) in the range from 0.7 to 0.9 of the maximum applicable frequency (MFC) ) radio direction different from the value of the RCF assigned for any other radio direction, and also determine the value of each of the N-1 values of the angle of arrival of the radio signal reflected from the ionosphere to the receiving point with the coordinates of the location of the URSi when transmitting the radio signal from URSj to the corresponding one of N-1 ORC assigned to URSj for the corresponding N-1 azimuthal radio directions, and the value of each of the N-1 values of the angle of arrival of the radio signal to the receiving point with the coordinates of the location of URSj when transmitting the radio signal from URSi to the corresponding one of the N-1 ORCs assigned to UPSi for the corresponding N-1 azimuthal radio directions, and form a frequency schedule for the next frame interval T _{to the} BCC operation, indicating for each of the two URS interacting for each of the M radio directions, data about one value ORCh, N-1 values of the angle of arrival of radio waves, radiation power, as well as data on a uniform for all URS form of transmitted or received signal and information transfer rate, which bring the central URS to each peripheral URS at the end of each inte tore T _to by transmitting technological radiograms in the manner described above, while in the initial time interval of each frame interval T _to corresponding to the duration of the first clock interval ΔT _{1 of the} first cycle interval T _c1 , which determines the beginning of each frame interval, the transmission of RG from URS1 is not performed, in this clock interval on each URS for each of the N-1 azimuthal radio directions in accordance with the data of the frequency schedule obtained at the end of the previous frame interval, the necessary switching and changing the settings of the corresponding receiving and transmitting technical means and the formation of its AIC N-1 radiation patterns, the spatial direction of the maximum of each of which corresponds to the direction of arrival of the radio signal transmitted from the URS interacting along this radio direction to the corresponding one of the N-1 RCFs assigned for operation this URS relevant azimuth radionapravleniyam, when the next second clock interval? T ₂ of the first cyclic interval T _u1 each frame th interval T _to WBU work carried out in accordance with the above method with the parameters of each URS ARIA adapted to the propagation conditions for each azimuthal radionapravleniyu.