RU2774409C1 - Method for increasing the noise immunity of data transmission over a short-wave radio channel in a departmental communication system - Google Patents

Abstract

FIELD: radio engineering.

SUBSTANCE: invention relates to the field of radio engineering and can be used to transmit data over a short-wave radio channel in a departmental communication system. In the method for transmitting data over a short-wave radio channel in a departmental communication system, due to the parallel retransmission of the signal and the formation of a virtual active phased array in the direction of the recipient of the message, the maximum signal-to-noise ratio is created, which also improves the noise immunity of the radio line. Additionally, there is a decrease in the spatial and energy availability of the sender of messages for the enemy’s electronic warfare system, which makes it difficult to open and suppress the entire radio communication line. In addition, unmasking signs of the sender of messages, which in this method is located outside the zone of possible intelligence, are eliminated.

EFFECT: increase in noise immunity based on a decrease in the energy and spatial availability of radio-electronic means, as well as the elimination of unmasking signs of radio-electronic means by which the operational and tactical affiliation of control points is determined.

1 cl, 1 dwg

Description

The invention relates to the field of radio engineering and can be used to organize radio communications with increased requirements for reconnaissance security and protection against deliberate interference. The technical result of the method is to increase the noise immunity of the radio communication channel between control points and airborne objects, with the possibility of reducing the power of the transmitters of both correspondents in a departmental communication system (VSS), as well as improving intelligence protection and electromagnetic compatibility.

The closest in technical essence to the claimed invention is a method for improving the noise immunity of data transmission over a short-wave radio channel in a departmental communication system, which consists in the frequency-time separation of radio channels, while the URS in the transmission mode is connected to a transmitting antenna, the radiation pattern of which corresponds to the conditions for the propagation of radio waves in the azimuth radio direction to the URS operating in receive mode. At the URS operating in the receive mode, spatial selection of the transmitted radio signal reflected from the ionosphere is carried out by its antenna-receiving complex (ARC), one of the radiation patterns selected for receiving of which corresponds to the conditions for the 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 in order to adapt the parameters of each URS according to the operating frequency used, the information transfer rate, the radiation power, as well as the spatial orientation of the HSC radiation pattern and the radiation pattern of the transmitting antenna, it is carried out depending on the propagation conditions of radio waves when working on each of the N-1 azimuth radio directions URS1↔YPCj (Patent RU 2565768, C1, IPC H04V 7/02 (2006.01). Published 2015.10.20).

The disadvantages of the method are:

- the inability to use it when organizing a departmental communication system using mobile radio stations (complex and bulky antenna systems with a controlled radiation pattern can only be implemented in a stationary version or expensive and extended phased antenna arrays of the KB range);

- high probability of opening by the electronic warfare system of stationary radio communication nodes whose coordinates are known to everyone in advance and, as a result, jamming all radio communication nodes, which significantly reduces noise immunity.

The technical result of the proposed system is an increase in noise immunity based on a decrease in the energy and spatial availability of electronic equipment, as well as the elimination of unmasking signs of electronic equipment, which determine the operational-tactical affiliation of command posts.

The specified technical result is achieved by the fact that in a known method for improving the noise immunity of data transmission over a short-wave radio channel in a departmental communication system consisting of N radio stations of the same type, one of which is central and the rest are peripheral, it consists in the frequency-time separation of radio channels, while the central radio station establishes radio communication with peripheral radio stations and transmits a packet encoded with an error-correcting code at the optimal radio frequency with the required power and transmission rate, in peripheral radio stations the packets are decoded, analyze and correct errors, and also check the address part of the received packet if the address part of the received packet does not match the address of the peripheral radio stations, then the packet with the least number of errors is selected, again encoded and retransmitted further, characterized in that the radio station of the recipient of the message establishes communication with at least four peripheral radio stations , generates a clock signal consisting of the address of the receiving radio station and a probing signal with a known initial phase, emits it, peripheral radio communication nodes receive the clock signal, process, allocate the address and measure the phase of the probing signal, using the data obtained, change the phase of the signal received from the central radio station , and relay it to the recipient of the message.

The essence of the invention lies in the fact that the radio station of the recipient of the message establishes communication with at least four peripheral radio stations, generates a clock signal consisting of the address of the receiver radio station and a probing signal with a known initial phase, emits it, the peripheral radio nodes receive the clock signal, process, allocate the address and measure the phase of the probing signal, using the obtained data, change the phase of the signal received from the central radio station, and retransmit it to the recipient of the message.

Thanks to in-phase retransmission from at least four peripheral radio stations, the signal-to-noise ratio increases due to the addition of signals that have arrived with one phase at the input of the receiver of the message recipient. The presence of several repeaters reduces the number of unmasking signs of correspondents and makes it difficult to determine their operational-tactical affiliation.

The organization of the communication direction that implements a method for improving the noise immunity of data transmission over a short-wave radio channel in a departmental communication system is shown in the figure, where it is indicated: 1 - radio station sender of the message, 2-1, 2-2, 2-7, 2-8, - peripheral radio stations, 2 -3, 2-4, 2-5, 2-6 - peripheral radio repeaters. 3 - radio station recipient of the message, 4-4 - line of EW.

The method is carried out as follows, in a network of departmental packet radio communications of the KB range, consisting of a plurality of radio stations located in a certain territory, a radio direction is formed containing the radio station of the sender of the message 1, the radio station of the recipient of the message 3 and the peripheral radio stations of the repeaters 2. In this case, the enemy has the ability to conduct electronic warfare up to a limited range line (4-4).

The sender of the message is a radio station or a separate transmitting device at the disposal of the subscriber.

The radio station of the sender of the message 1 transmits it in binary form, divided into packets encoded with an error-correcting code, which are received by a certain number of peripheral radio stations 2-1, 2-2, 2-3, 2-4, 2-5, 2-6. If the address part of the received packet does not match the address of the peripheral radio station, then they decode, analyze, correct errors and select the one with the fewest errors from several identical received packets, encode again and retransmit further.

From the set of peripheral radio stations of repeaters distributed over a certain territory 2-1, 2-2, 2-3, 2-4, 2-5, 2-6, 2-7, 2-8, at least four radio stations capable of relaying are selected (2-3, 2-4, 2-5, 2-6) packets received from the sender of message 1.

In the process of retransmission at selected radio stations, repeaters 2-3, 2-4, 2-5, 2-6, synchronization of transmitters is provided for in-phase addition of radio signals at the reception point.

Since the distances between the radio station of the recipient of the message 3 and the radio stations of the repeaters 2-3, 2-4, 2-5, 2-6 are not the same, and change when it moves, it is necessary to synchronize the reference oscillators (OG) of the transmitters of the radio stations of the repeaters 2-3, 2 -4, 2-5, 2-6 to ensure in-phase addition of their power in the required spatial direction.

Synchronization is provided from the OG of the radio station of the recipient of messages 3, located at the point of reception due to the phase-locked loop (PLL) system implemented in the equipment for automating the entry into radio communication and its maintenance. In this case, the conditions for the propagation of radio waves in the radio channel will also be taken into account in the synchronization process.

The set of RSR 2-3, 2-4, 2-5, 2-6, emitting an in-phase signal, is a kind of virtual active phased antenna array (APAA), consisting of N-repeaters (individual transmitters with their own antenna systems) located in a certain way in space and emitters not connected by physical transmission lines.

Virtual APAA with the considered structure will provide in-phase summation of the signals of radio repeaters 2-3, 2-4, 2-5, 2-6 at the location of the radio station of the recipient of messages 3 and attenuation of the resulting signal in other directions.

This is equivalent to the formation of a virtual APAA beam pattern.

In this case, the geometric arrangement of the emitters and the distances between them can be arbitrary.

At the same time, the directional properties of the proposed virtual APAA are provided with the necessary amount of PCP (at least 4).

Transmitters operating on an omnidirectional or weakly directional antenna, for example, a whip asymmetric vibrator, 4 m long and an inclined dual vibrator 2 VNS 40/12 with a shoulder length of 40 m, can be used as repeaters, which allows solving the problem of directional transmission of electromagnetic waves in the DKM range.

Virtual APAA is a variable (a priori indeterminate) and varies depending on the distance to the recipient of the message, the state of the communication channel, the operational situation and other communication conditions.

If it is impossible to carry out retransmission by the repeater radio station involved in the virtual AFAR 2-3, 2-4, 2-5, 2-6, a search is made for other available radio stations 2-1, 2-2, 2-7, 2-8, which can be used as repeaters.

An analysis of the simulation results showed that when the power of two HF transmitters is combined, the directivity increases by 2.1 times, four - by 4.5 times, six - by 6.8 times, eight - by 10 times. Thus, the power emitted by 2-3, 2-4, 2-5, 2-6" will be concentrated strictly in the direction of the radio station of the recipient of message 3, which means that the signal level at the receiving point will increase.

Each radio station of a radio network, when using a method for improving the noise immunity of data transmission over a short-wave radio channel in a private communication system, can be a sender, a repeater, or a recipient of messages. Therefore, these means carry out additional functions:

- formation of a sign of the radio station of the sender of the message;

- search for free repeaters and selection of the optimal APAA structure;

- formation of addresses of repeaters, sender and recipient of messages;

- generation of clock signals;

- processing of the received clock signals and generation of control signals for automatic adjustment of the phase of the emitted radio signals.

These functions are implemented in software in the equipment for adapting advanced radio communication facilities of the 6th generation on the SDR platform.

This achieves the technical result specified in the invention.

The advantage of the invention is that when it is implemented due to the parallel retransmission of the signal with the formation of a virtual active phased array in the direction of the message recipient, the maximum signal-to-noise ratio is created, which also improves the noise immunity of the radio link. Additionally, there is a decrease in the spatial and energy availability of the message sender 1 for the enemy's electronic warfare system 4-4, which makes it difficult to open and suppress the entire radio communication line. In addition, the unmasking signs of the sender of messages are eliminated, which in this method is outside the zone of possible reconnaissance 4-4, which includes only repeaters 2-3, 2-4, 2-5, and their information value for the enemy reconnaissance system is minimal.

Claims (1)

A method for increasing the noise immunity of data transmission over a short-wave radio channel in a departmental communication system consisting of N radio stations of the same type, one of which is central, and the rest are peripheral, consisting in the frequency-time separation of radio channels, while the central radio station establishes radio communication with peripheral radio stations and transmits coded noise-immune packet at the optimal radio frequency with the required power and transmission rate, in peripheral radio stations decode the packets, analyze and correct errors, and also check the address part of the received packet, if the address part of the received packet does not match the address of the peripheral radio station, then select the packet with the least number of errors , encode again and retransmit further, characterized in that the radio station receiving the message establishes communication with at least four peripheral radio stations, which are a virtual active phased antenna this array for the central station, generates a clock signal consisting of the address of the receiving radio station and a probing signal with a known initial phase, emits it, the peripheral radio nodes receive the clock signal, process, allocate the address and measure the phase of the probing signal, using the received data, change the phase of the signal, received from the central radio station, and relay it to the recipient of the message.

Images