RU2619470C1 - Stationary node of territorial radio division of dkmv range - Google Patents

Abstract

FIELD: radio engineering, communication.

SUBSTANCE: stationary unit of territorial radio HF band contains in its structure additional sets of receive and transmit antennas radio, as well as hardware and software systems ionospheric sounding, determining spatial parameters of radio and determining the operating frequency range, providing maintenance sessions fashion 1F2 without fading multipath in around HF range.

EFFECT: increase in the radius of the territorial unit to radio coverage area 3000 km, exclusion of signal fading due to multipath in large coverage area, expanding the range of operating frequencies of the service area of the node.

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Description

The invention relates to radio communication systems DKMV range using the reflection of radio waves from the ionospheric layer F2. The invention can be used to build large-scale national or continental radio access networks.

The invention can be used to create local radio communication zones with a radius of a continuous service area of up to 3,000 km with increased throughput in areas not equipped with other systems and devices of electrical communication.

To assess the novelty and technical level of the claimed solution, we consider a number of technical means known to the applicant for a similar purpose, characterized by a combination of features similar to the claimed invention, known from the information that became public until the priority date of the invention.

A known system of stationary digital broadband radio access containing a base (central) microwave radio station with an antenna having a circular or sector beam pattern, and located within direct radio visibility, at different distances from the base (central) microwave station, a subscriber group (terminal) microwave radio station with highly directional antennas oriented to the base (central) microwave station, characterized in that a microwave power divider is introduced into the base station into N directions, N-1 are introduced directional antennas working with two orthogonal polarizations, the group output of the broadband transmitter (s) of the microwave base station is connected to the input of the power divider, one of the outputs of which is connected to a single-mode input of the antenna polarization selector with a circular or sector beam pattern in the horizontal plane, and the other N- 1 outputs of the power divider are connected to the corresponding inputs of the polarization selectors N-1 of directional antennas, while in the composition of the microwave base station an adder of microwave signals received from subscriber stations from N directions, comprising N preselectors, N low-noise microwave amplifiers and an addition circuit, the output of which is connected to the group input of the receiver (s) of the microwave base station, and each individual signal adder input is connected to the output the polarization selector of the corresponding antenna, see RF patent No. 2285339.

The disadvantage of such systems is a small (with a radius of several tens of kilometers) service area of one base station, limited by direct visibility between the antennas of the base and subscriber radio stations.

Known zone systems DKMV radio with a remote relay point (OV Golovin, SP Simple. Systems and devices of short-wave radio communications. Hot Line - Telecom. 2006. 600 S.). The main disadvantage of such systems is the relatively small (with a diameter of up to 1000) service area of one repeater, and the location area of the repeater itself is not served by it.

A well-known DKMV communication system using the reflection of radio waves from the ionosphere, containing transceiver devices connected to a transceiver antenna of zenith radiation (Polyakov V.T. NVIS - NEAR COMMUNICATION TECHNIQUE ON SQ. "Special equipment and communications", 2009, No. 1, p. 59- 63). This technical solution is made as a prototype of the claimed invention. A base station or radio center built using this technology provides communication with subscribers in a zone with a radius of up to 500 km from the location of the anti-aircraft radiation antenna (AZI). The disadvantages of the system are a relatively small service area and a small range of operating frequencies, which is limited by the critical frequency of the ionosphere layer F2 - ƒ _krF2 . This frequency in winter nighttime can be reduced to 2.5 - 3.0 MHz with a corresponding decrease in the bandwidth of a node using only this technology.

The problem solved by the claimed invention is as follows:

Known radio access nodes (anti-aircraft radiation nodes and remote repeaters) of the DKMV range are suitable for organizing local radio access zones with a relatively small number of radio subscribers. This limitation is associated with the small allowable range of operating frequencies of such nodes, due to the conditions of use. The quasistationary ionosphere in the stationarity interval provides reflection of radio waves, approximately, in the range from 2 to 30 MHz, depending on the angles of incidence of the radio waves (the length of the radio lines). A node for which this entire range is operational can provide the maximum number of radio channels and the maximum radius of the subscriber service area. In turn, a node with the maximum possible service area allows the formation of large-scale radio access networks with a small number of base nodes.

The claimed invention is directed to the creation of a radio access node of the DKMV range with a maximum radius of the service area and a maximum range of operating frequencies, which allows serving a large number of subscribers using radio lines free of multipath fading.

The invention as a technical solution is expressed in the following set of essential features, sufficient to achieve the above result.

According to the invention, a stationary site of territorial radio access of the DKMV range, comprising a receiving radio center with a multi-channel radio receiving device connected to a receiving antenna of an anti-aircraft reception, and a transmitting radio center with a multi-channel radio transmitting device connected to a transmitting antenna of an anti-aircraft radiation, connected to each other by a dedicated cable or relay link and connected each of the communication lines of a single automated communication network is characterized by the fact that at the receiving radio center e it is equipped with a set of receiving subband antennas for expanding the access area connected to the inputs of the antenna switch, the outputs of which are connected to functional groups of multichannel radio receivers of the ionospheric-wave service, automatic communication and adaptive radio lines, the signal outputs of which are connected to the signal inputs of the corresponding software and hardware complexes united in a single local network of the node with the hardware-software complexes of the geographic information service, information Safety first broadcasting center management, switch, router, gateways dedicated link transmitting radio center and external networks; at the same time, at the transmitting center, the stationary unit is equipped with a set of transmitting band antennas for expanding the access zone, each of which is connected to the output of the power addition circuit that combines at its inputs a corresponding group of radio transmitting devices, all channel forming devices along with additional software and hardware complexes for controlling the transmitting radio center , a switch-router and gateways are integrated into the local network of the radio center.

The technical result provided by the implementation of the claimed combination of essential features is as follows:

- an increase in the radius of the service area of the territorial radio access hub to 3,000 km;

- elimination of signal fading caused by multipath propagation in a large service area;

- expanding the range of operating frequencies in the service area of one node.

An increase in the radius of the service area of the territorial radio access node to 3000 km is provided by sets of band receiving and transmitting radio access antennas for radio lines of any length in the range of 0-3000 km.

The elimination of signal fading due to multipath propagation in a large service area is provided by PAK IV, PAK GEO, which determine the parameters of radio lines with mode 1F2, as well as PAK AUS, PAK ARL, which create and maintain a radio line with the parameters found.

The extension of the operating frequency range in the service area of one node is ensured by all the essential features, since the support of radio links in the range of 0-3000 km only by 1F2 modes requires the use of the entire frequency range of the ionospheric propagation of 2-30 MHz.

The invention is illustrated by drawings, where in FIG. 1 shows a connection diagram of a diversity receiving (PRC) and transmitting center (PDRC) node, their connection to a single automated communication network (EACC) and interaction with CAT, FIG. 2 is a functional diagram of a receiving radio center as a part of the assembly, in FIG. 3 is a functional diagram of a transmitting radio center as part of a node.

The positions in the drawings indicate:

1 - stationary site territorial radio access DKMV;

2 - receiving center (PRC) node;

3 - transmitting center (PDRTS) node;

4 - mobile and stationary network subscriber terminals (CAT);

5 - unified automated communication network (EACC);

6 - a set of subband stationary receiving radio access antennas, the number of which depends on the number of antennas in the set;

7 - a set of subband stationary receiving antenna arrays of the radio links, the number of which depends on the number of antennas in the set;

8 - receiving antenna switch;

9 - a set of digital multi-channel radio receivers (TsRPU) of the ionospheric-wave service;

10 - a set of multichannel CRPU automatic establishment service;

11 - a set of multichannel CRPU service adaptive radio links;

12 - hardware-software complex of the ionospheric-wave service (PAK IW);

13 - hardware-software complex of automatic communication establishment service (PAC AUS);

14 - software and hardware complex adaptive radio links (PAK ARL);

15 - hardware-software complex of the geographic information service (PAK GEO);

16 - hardware-software complex of information security (PAKIB);

17 - a hardware-software complex for controlling a radio node (PAK UR);

18 - gateway dedicated line with a transmitting radio center;

19 - gateway for interfacing with EACC lines and other external networks;

20 - software and hardware node switch-router (PAK UKM);

21 - a set of sub-band stationary transmitting radio access antennas, the number of which depends on the number of antennas in the set;

22 - a set of subband stationary transmitting antenna arrays of the main radio links, the number of which depends on the number of antennas in the set;

23 - power addition device, the number of which depends on the total number of antennas of the radio center;

24 - a set of digital radio transmitting devices (GPRPDU) radio access, the number of which depends on the number of antennas in the set;

25 - a set of digital radio transmitting devices (CRPDU) of the main radio links, the number of which depends on the number of antennas in the set;

26 - a hardware-software complex for transmitting radio center control (PAK URPRD);

27 - software-hardware switch-router of the transmitting center (PAK CCM),

28 - gateway dedicated line with a receiving radio center;

29 - gateway for interfacing with EACC lines and other external networks. The claimed stationary radio access node contains a receiving 1 and transmitting 2 radio centers with software-defined equipment, anti-aircraft antennas and radiation, interconnected by a dedicated communication line and connected by connecting lines to the EACC 5 each. The PRC 2 of the node contains a set of subband stationary receiving antenna antennas for radio access 6 and a set of subband stationary receiving antenna arrays of the radio links 7. All antennas are connected to the antenna inputs of the antenna switch 8, the outputs of which are connected to a set of multi-channel CRPs of the ionospheric-wave service 9, the outputs of which are connected to the signal inputs PAK IV 12, a set of multichannel central control rooms of the AUS 10 service, the outputs of which are connected to the signal inputs of PAK AUS 13, a set of multi-channel central control services of the adaptive line 11, the outputs of which are connected to the signal inputs of PAK ARL 14. The above functional software and hardware systems together with PAK GEO 15, PAK IB 16, PAK UR 17, gateways 18 and 19, PAK UKM 20 are combined with a high-speed data and control bus a single nodal local control computer network.

PDRC 3 nodes contains a set of sub-band stationary transmitting radio access antennas 21, a set of sub-band stationary transmitting antenna arrays of radio links 22, the inputs of which are connected to the signal outputs of the power addition devices 23, the signal inputs of which are connected to the signal outputs of the channel central control center of the radio access 24 and the signal outputs of the channel main DPCA radio line 25. The above functional software and hardware systems together with PAK URPRD 26, PAK TsKM 27, gateways 28 and 29 unite They are equipped with a high-speed bus for controlling and transmitting data to a single nodal local computer-control network of the MPDC.

The claimed stationary radio access node operates as follows.

PAK IV 12 nodes according to a given daily schedule performs vertical sounding of the ionosphere above the node and oblique sounding with stationary CAT 4 according to a given group of azimuths around the node. Based on the results of sounding, it determines the distribution of critical frequencies in the circular region of the ionosphere with a diameter of 3000 km above the node.

The node performs customer service in the following modes. In the call mode from the subscriber of the external network to CAT 4 of the served zone through the PAK U KM 20, the PAK AUS 13 requests free channeling radio from the PAK UR 17 and performs the AUS procedure with the called CAT 4 on the fixed zone grid of calling frequencies. During the procedure, CAT authentication is performed 4 together with PAK IB 16, updating the current coordinates of CAT 4 and calculating the range and azimuth of the radio link together with PAK GEO 15, determining the operating frequency range for mode 1F2 together with PAK IV 12. After determining the parameters of the radio line, PAK AUS 13 selects initial frequencies for data transmission and transmits them with the parameters of the radio link to the PAK AR L 14, which performs a communication session in the frequency adaptation mode and after its end returns PAK UR 17 the released channeling means.

In the call mode from CAT 4 of the service area to the subscriber of the external network, the PAK AUS 13 receives a request from CAT 4 on the calling frequency grid, requests from the PAK UR 17 free channelization radio tools and performs the AUS procedure with the calling CAT 4. During the procedure, CAT 4 is authenticated jointly with PAK IB 16, updating the current coordinates of CAT 4 and calculating the range and azimuth of the radio link together with PAK GEO 15, determining the operating frequency range for mode 1F2 together with PAK IV 12. After determining the parameters of the radio line, PAK AUS 13 selects the initial frequencies for data transmission and transmits them with the parameters of the radio line to the PAK AR L 14, which performs the communication session in the frequency adaptation mode, transmits the session data to the outside party through the PAK UKM 20 and after the end of the session returns the PAK UR 17 free channeling means.

In the exchange mode of two CAT 4 of the served area, at the first stage, the AUS procedure is performed with the caller. At the second stage, the AUS procedure is performed with the called subscriber and the AAC 13 PAC makes a decision on the execution of the session either by relaying messages or via a direct radio link. In the second case, at the third stage of the ACS procedure, the sign and parameters of the direct communication radio line without relaying messages are transmitted to both subscribers and the node’s communication sessions with these subscribers are terminated.

Antennas of antiaircraft radiation (ASI) used in the prototype allow serving with a vertical incidence and reflection from the ionosphere allow serving a zone with a radius of up to 500 km. ASI can be implemented in various known ways (for example, USSR copyright certificate No. 766487).

For electromagnetic access to any area of the service area with a radius of 3000 km that is not covered by an obstacle, the node must use the entire range of ionospheric propagation frequencies. The entire range is divided into several, for example, four sub-bands corresponding to radio lines of various lengths (Zaitsev V.V. Estimation of the size of the service area and the lower limit of the throughput of the radio access node of the DKMV range. Information and space, No. 1, 2014, pp. 13-17). For each of the subbands, one of the known methods implements an antenna with a circular radiation pattern in the horizontal plane and providing radiation at angles to the horizon, corresponding to the length of the radio lines served by this subband. Antennas for such a set can be implemented both in the form of antenna arrays and in the form of simple vibrator antennas, for example, a set of horizontal turnstile antennas raised above the ground with different lengths of vibrators for different subbands.

The hardware and software systems for the proposed node are implemented on any modern samples of computer technology and the architecture of computer networks and complexes using publicly available operating systems, including real-time operating systems. Special software for solving the problems of determining the parameters of the ionosphere and radio links can be performed on the basis of known methods and methods. For PAC IV 12 can be used, for example, "A method for determining the maximum applicable frequency of the radio path in the decameter range", USSR copyright certificate No. 1762413. Methods for determining the length of radio links taking into account the curvature of the earth's surface are also known (NN Stepanov. Spherical trigonometry. OGIZ, State Publishing House of Technical and Theoretical Literature. L., Moscow: 1948). A method for selecting the operating frequencies of radio lines of various lengths for mode 1F2 is known and published. (Zaitsev V.V., Krukovskaya I.Ya. Choice of operating frequencies in the service area of the radio access node of the DKMV band. "Information and Space". 2015, No. 4, pp. 10-12). All professional transmitting and receiving equipment for the DKMV range has a working range often from 1.5 to 30 MHz.

Claims (1)

The stationary site of the territorial radio access of the DKMV range, comprising a receiving radio center with a multi-channel radio receiving device connected to a receiving antenna of an anti-aircraft reception, and a transmitting radio center with a multi-channel radio transmitting device connected to a transmitting antenna of an anti-aircraft radiation, interconnected by a dedicated cable or radio-relay communication line and connected to the lines each of a single automated communication network, characterized in that it is equipped with a set at the receiving radio center receiving sub-band antennas for expanding the access zone connected to the inputs of the antenna switch, the outputs of which are connected to functional groups of multichannel radio-receiving devices of the ionospheric-wave service, automatic communication and adaptive radio lines, the signal outputs of which are connected to the signal inputs of the corresponding software and hardware systems, combined into a single the local network of the node with the hardware and software systems of the geographic information service, information security is managed I broadcasting centers, switch-routers, gateways dedicated link transmitting radio center and external networks; at the same time, at the transmitting center, the stationary unit is equipped with a set of transmitting band antennas for expanding the access zone, each of which is connected to the output of the power addition circuit that combines at its inputs a corresponding group of radio transmitting devices, all channel forming devices along with additional software and hardware complexes for controlling the transmitting radio center , a switch-router and gateways are integrated into the local network of the radio center.

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