RU2650191C1 - Departmental system of two-way high-speed radio communication with efficient use of the radio frequency spectrum - Google Patents

Abstract

FIELD: radio engineering and communications.

SUBSTANCE: invention relates to the field of radio communication and can be used in the construction of departmental communication systems (DCS), including medium-wave (MW) and short-wave (SW) ones, providing full-range single-frequency duplex and simplex high-speed exchange of digitized data and voice messages between radio subscribers of the system, and is designed to increase the noise immunity of conducting duplex and simplex radio communication between any two DCS TS due to the provision of the possibility of selecting the optimal communication frequency with a minimum level of additive interference from the corresponding group of optimal operating frequencies determined by the results of short-term prediction of ionospheric propagation conditions for each time interval of operation of the DCS. Departmental system of two-way high-speed radio communication with efficient use of the radio-frequency spectrum consists of K identical transceiver sets, each of which contains a serially connected analog signal source, an encoder, a first input signal switch, a signal compression device, a second input signal switch, a radio transmitter, a radio switch, and a radio receiving device (RRD), each transceiver set comprises a clock driver and an optimum communication frequency selection device (OCFSD), RRD includes K receiving channels combined by the antenna inputs, the value of K determines the number of optimal operating frequencies allowed for communication to each transceiver set, the values of which, when the departmental system operates within each time interval of the established duration, are determined by the frequency schedule compiled from the results of a short-term prediction of the ionospheric propagation conditions of radio waves.

EFFECT: increase of noise immunity when conducting duplex and simplex radio communication.

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Description

The invention relates to the field of radio communications and can be used in the construction of departmental communication systems (BCC), including medium-wave (CB) and short-wave (KB), providing full-access single-frequency duplex and simplex high-speed exchange of data and voice messages converted to digital form, between radio subscribers of the system without the use of duplex base stations-repeaters.

Known two-way radio communication systems (satellite, radio-relay, mobile), using frequency duplex (FDD), when the receive and transmit frequencies of each subscriber channel are spaced by the size of the duplex frequency separation, which ensures the simultaneous operation of the receiving and transmitting devices of interacting radio stations [1].

The disadvantage of these systems is the inefficient use of the radio frequency spectrum [1], since for the organization of each duplex radio communication between any two radio subscribers it is necessary to use two frequency channels. The disadvantage is that the duplex mode of operation, implemented by connecting the transmitter and receiver (operating at different frequencies) through a duplex filter with a transceiver antenna, can only be used in radio communication systems operating in the frequency range above 30 MHz.

In CB and KB radio communication systems, such a mode of operation between each two interacting radio stations of the communication system is not used due to the difficulty of implementing a duplex filter in each radio station in the frequency range up to 30 MHz [2].

To ensure two-way communication in the KB range when using frequency duplex, it is required (in addition to the separation of the reception and transmission frequencies) to use the spatial diversity of the receiving and transmitting radio equipment of radio stations (receiving and transmitting antennas, or radio stations in general) to ensure their electromagnetic compatibility (EMC), which leads to to complicating and significantly increasing the cost of such systems during their implementation [2, 3].

Known duplex radio communication systems using frequency and time diversity of the reception and transmission channels of each subscriber channel, which include digital trunking and cellular multiple access systems with time division (GSM, TETRA, etc.) [4].

In these systems, at each operating frequency with time division, several subscriber channels are placed to provide duplex separation of the reception and transmission frequencies and time separation of the reception and transmission modes in each subscriber channel. This allows for duplex radio communication using a duplex base station and simplex subscriber radio stations.

The disadvantages of such systems, as well as the above systems, include the complexity and cost of such systems when they are implemented to work in the KB frequency range due to the need to use a duplex base station, as well as the need to separate the transmitting and receiving equipment of the duplex base station to provide EMC.

A known radio communication system, which allows on the basis of the time separation of the processes of reception and transmission, as well as compression of the transmitted analog signal and its recovery when receiving, to provide duplex radio communication with telephone signals when working on one antenna using a single carrier frequency [5].

However, this system has the following disadvantages [2]:

1. Only duplex telephone radiocommunication is provided with the transmission of analog two-band signals (AZE emission class with a occupied frequency band of 6800 Hz), which reduces the EMC and noise immunity from the effects of concentrated radio frequency interference compared to analogs.

2. Duplex radio communication with discrete messages is not provided, which reduces the functionality of the system and does not allow for collaboration with commercially available equipment for guaranteed closure of discrete information.

3. To ensure the separation of the processes of reception and transmission, it is necessary to regularly transmit special clock signals, which reduces the bandwidth of the communication channel.

4. It is not envisaged to increase the number of radio subscribers (transceiver kits - PPC) that can operate in the regional KB radio system.

A known system of zone duplex communication with time division of transmission and reception channels, containing a base station - a repeater, which includes receiving and transmitting hardware that implements N relay channels of received signals, and 2N subscriber stations, each relay channel communicating via radio channel with a pair subscriber radio stations [6].

In this duplex radio communication system, each of the subscriber radio stations in the communication mode periodically switches from reception to transmission with a frequency of f = 1 / T (T is the period of the receive / transmit cycle) and transmits information frames alternately to the base station and receives information from the base station, which, in turn, relays information frames from one subscriber station to another.

To enter the communication, the calling subscriber station receives the base station clock and adjusts its own transmit-receive cycle to the receive-transmit cycle of the relay channel of the base station, then transmits the ring signal in the interval T _{prm of the} base station. The called subscriber radio station, having received a call signal from the base station, provides synchronization with the base station by the clock signal transmitted to the base station as part of the ring signal, also by adjusting its own transmit-receive cycle to the transmit-receive cycle of the base station relay channel.

The following disadvantages of this duplex radio communication system when operating in a KB radio channel should be noted:

1. Using a base station significantly complicates the communication system as a whole and requires unreasonably high financial costs for its implementation, since the number of relay channels determines the corresponding number of simultaneously conducted communications between radio subscribers (simultaneously working pairs of radio subscribers), each of which must be equipped with a subscriber radio transceiver a set with time division channels of reception and transmission. Moreover, each relay channel should include the following necessary technical means of the KB range:

- radio receiver;

- receiving antenna;

- a radio transmitting device with the necessary radiation power to provide the required communication range;

- transmitting antenna;

- demodulator of information signals;

- a demodulator of clock signals;

- modulator of information signals;

- modulator of synchronization signals;

- control units, power supply, interfaces, etc.

Moreover, the KB antennas of the range (receiving and transmitting) of each relay channel, in contrast to the antennas of subscriber radio stations, should be more efficient, and therefore larger and placed on large areas, like antennas of stationary geographically dispersed radio communication nodes [3, 7].

Since the base station must have N relay channels, the base station designed for operation in the KB radio channel should be a virtually stationary territorially spaced N-channel transceiver radio node, for example, similar to that given in [8].

The high cost of manufacturing and commissioning of such a KB radio system and the significant overhead required to maintain such a base station may impede its implementation.

2. To conduct each duplex radio communication through the base station, it is necessary to use two frequencies, which reduces the efficiency of using the radio frequency spectrum in relation to the previously considered communication system [5].

3. Since for the implementation of the communication system under consideration [6], its authors provide for the use of transceiver kits from the previously considered duplex radio communication system [5] as a subscriber radio station, the communication system [6] also has all the disadvantages of the system [5] above.

4. In this system [6], when using ionospheric radio waves, there is no change in the optimal operating frequencies (ORC) for each pair of interacting radio stations depending on the time of day and time of the year, which will lead to a decrease in noise immunity of radio communications or to complete loss of communication from due to operation at non-optimal operating frequencies [9].

Of the known two-way radio communication systems, the closest in essence to the tasks to be solved and most of the coinciding features is the departmental system of two-way high-speed radio communication with efficient use of the radio frequency spectrum, presented in [10], consisting of R transceiver kits (PPC), each of which contains a source connected in series analog signal, encoder, first input switch, signal compression device, second input switch, modulator, radio a transmitting device (PRDU), a radio signal switch and a radio receiving device (RPU), a serially connected demodulator, a signal expansion device, an output signal switch, a decoder and an analog signal receiver, as well as a transceiver antenna, the input-output of which is connected to an additionally connected RPdU output, a source discrete signal, the output of which is connected to another input of the first input signal switch, the receiver of the discrete signal, whose input is connected to another output of the output switch signals, the control input of which, which is the control signal source input of the control panel, is combined with the control input of the first input signal commutator, a digital selective call signal conditioner (DSC), a control unit and a clock demodulator, the input and output of which are connected respectively to the input of the demodulator and the first input control unit, the second input of which is connected to the control output of the signal compression device, the control input of which is combined with the control input of the RPDU, with the control input of the comm radio signal tator, with the control input of the demodulator and with the output of the control unit, the third input of which, which is the control input of the DSC PPK signal transmission, is combined with the control input of the second input signal switch and with the control input of the DSC signal generator, the output and clock input of which are connected respectively to another the input of the second input signal switch and with the clock input of the signal compression device, the fourth input of the control unit is the input of the control panel in standby mode "reception", and the fifth and sixth its inputs are connected respectively to the clock output of the signal expansion device and to the additionally connected output of the demodulator.

The disadvantages of the well-known departmental system (AC) radio [10] include the following:

1. The aircraft’s functionality is limited due to the impossibility of maintaining between two two control panels of single-frequency simplex radio communication without doubling the data transfer rate and with the remote switching (via radio channel) of each “slave” control panel from duplex communication mode to simplex communication mode.

2. A relatively long waiting time for the communication of each “leading” ACC with the required “slave” ACC due to the use of one common channel for all R ACCs at the allocated transmit-receive frequency, which can be used sequentially in time.

3. Insufficient noise immunity of radio communications when using ionospheric radio waves due to the lack of the ability to change the optimal operating frequencies for each two interacting BCPs depending on the time of day and time of year, as well as the choice of optimal operating frequencies free of interference.

4. To ensure stable synchronous operation of each two interacting control panels (“master” and “slave”), each of them requires devices that form transmitted binary symbol sequences (discrete signal source and encoder) with high stability, which is determined by the stability of the master generators in these devices. Because of this, during relatively long duplex communication sessions, inserts or occurrences of individual binary symbols in the demodulated binary signal of only the “leading” PPC can occur, since from the moment of phasing the write and readout counters of the “slave” PPC, carried out after the decoder detects the DSC signal of its address , after a certain time, a shift in the critical value of the temporary position of the fronts of the control meander at the output of the “slave” control panel control unit (synchronous with the control yuschim meander "lead" PEP) and moments sequence of binary symbols output from the first switch input of the AUC.

Such possible signal distortions will practically not affect the quality of voice messages received by the “leading” PPC, however, when exchanging data during sufficiently long communication sessions, such distortions to some extent can reduce the reliability of discrete messages received by the “leading” PPC.

The tasks to be solved by the proposed invention is a departmental system of two-way high-speed radio communications with efficient use of the radio frequency spectrum are:

1. Expanding the functional capabilities of the aircraft by providing the possibility for each two control panels, in addition to single-frequency duplex radio communication, to also single-frequency simplex radio communication with remote switching (via radio channel) of any “slave” control panels to both duplex radio communication mode and simplex radio communication at the request of the radio initiator ("Leading" PPK). In addition, in the simplex radio mode, higher noise immunity with respect to the duplex radio mode should be ensured by halving the speed of the transmitted data.

2. Significant reduction in the waiting time for any “leading” control panel to communicate with the required “slave” control panel without using a duplex base station — a repeater, which provides fast organization of the available communication channels between the radio subscribers of the aircraft [7, 11].

3. Increasing the noise immunity of conducting duplex and simplex radio communications between any two ACPs by providing the possibility of choosing the optimal communication frequency with a minimum level of additive interference from the corresponding group of optimal operating frequencies, determined by the results of short-term forecasting of the conditions of ionospheric propagation of radio waves for each time interval of aircraft operation.

4. Ensuring stable synchronous operation of every two interacting control rooms regardless of the duration of a duplex communication session.

The solution of the tasks is achieved by the fact that in the departmental system of two-way high-speed radio communication with efficient use of the radio frequency spectrum, consisting of R PPC, each of which contains a source of an analog signal, an encoder, a first input signal switch, a signal compression device, a second input signal switch, modulator, RPdU, switch of radio signals and RPU, serially connected demodulator, signal expansion device, first switch of output signals, the decoder and receiver of the analog signal, as well as the transceiver antenna, the input-output of which is connected to the additionally connected output of the RPDU, the source of a discrete signal, the output of which is connected to another input of the first switch of input signals, the receiver of a discrete signal, the input of which is connected to another output of the first switch of output signals, the control input of which, which is the control input of the control signal source, is combined with the control input of the first input signal switch, the signal shaper A DSC, a control unit and a clock demodulator, the input and output of which are connected respectively to the input of the demodulator and the first input of the control unit, the second input of which is connected to the control output of the signal compression device, the control input of which is combined with the control input of the RPDU, with the control input of the radio signal switch, with the control input of the demodulator and with the output of the control unit, the third input of which, which is the control input of the DSC PPK signal transmission, is combined with the control input of the second switch in input signals and with the control input of the DSC signal conditioner, the output and the clock input of which are connected respectively to the other input of the second input signal commutator and to the clock input of the signal compression device, the fourth input of the control unit is the input of the control panel in standby "reception" mode, and the fifth and its sixth inputs are connected respectively to the clock output of the signal expansion device and to the additionally connected output of the demodulator, the signal compression device of each control panel consists of the first memory block, the first a write counter, a first phasing unit and a first read counter, the output of which is combined with a read control input of the first memory unit and with a first input of the first phasing unit, the second input of which is combined with a write control input of the first memory unit and with the output of the first write counter, whose control input is connected to the first output of the first phasing unit, the second output of which is connected to the control input of the first readout counter, the clock input of which is the clock input of the device A signal whose control input and control output are respectively the control input and control output of the first phasing unit, the control unit of each control panel contains the first OR element, the first and second triggers, the third input signal switch, the OR-NOT element and the DSC signal decoder, the output of which combined with the first input of the first OR element and with the first input of the first trigger, the output of which is connected to the control input of the third input signal switch, the output of which is connected to the first input of the element OR NOT, the second input of which is connected to the output of the second trigger, the first input of which is connected to the output of the first OR element, the first and second inputs of the third input signal switch, the second input of the first trigger combined with the second input of the first OR element, the second input of the second trigger , the first and second inputs of the DSC signal decoder are the first, second, third, fourth, fifth, and sixth inputs of the control unit, respectively, the signal expansion device of each transceiver set consists of a second block an eye of memory, a second write counter, a second phasing block, a second read counter, a clock synchronization block and a cyclic synchronization block, the input of which is combined with the input of the signal expansion device and the input of the clock synchronization block, the first and second outputs of which are connected respectively to the clock input of the second read counter and with the clock input of the cyclic synchronization unit combined with the clock input of the second recording counter and being the clock output of the signal expansion device, the output is second the write counter is combined with the recording control input of the second memory unit and with the first input of the second phasing unit, the second input of which is combined with the read control input of the second memory unit and with the output of the second read counter, the control input of which is connected to the first output of the second phasing unit, the second output which is connected to the control input of the second recording counter, and the control input of the second phasing unit is connected to the output of the cyclic synchronization unit, are additionally introduced into each control panel a clock pulse generator and a device for selecting the optimal communication frequency (UHCO), the first control input of which is the control input for selecting the optimal communication frequency of the control panel, and the second control input, control output, control output-input, channel output and channel input-output of the UHFD are connected respectively to the first additional output of the control unit, with the first additional input of the control unit, with an additional control input-output RPDU, with an additionally connected input of the demodulator and with the corresponding and channel outputs-inputs of the RPU, which additionally uses K-1 reception channels combined by antenna inputs with the antenna input of the RPU, K separate channel outputs-inputs of which are channel outputs-inputs of the corresponding K reception channels, and the value of K determines the number allowed for communication to each transceiver set of optimal operating frequencies, the values of which during the operation of the departmental system within each time interval of a specified duration, are determined by the hour the total schedule, compiled from the results of short-term forecasting of the ionospheric propagation of radio waves, the input of the pulse shaper is connected to the additional clock output of the signal expansion device, and the first, second, third and fourth outputs of the pulse shaper are connected respectively to the additionally connected clock input of the DSC signal shaper, with additional clock input of the signal compression device, with an external synchronization input of a discrete signal source and with an input ohm of external synchronization of the encoder, while the control input of the clock generator is combined with an additional control input of the signal compression device, with an additional input of the signal expansion device and with the second additional output of the control unit, the second and third additional inputs of which are respectively the input of the control panel to simplex radio communication and the input of the installation of the control panel in the "reception" or "transmission" mode.

In each control panel, a fourth input switch, a third trigger, a second OR element, the output of which is connected to the first input of the third trigger, and a third OR element, the output of which is connected to the second input of the third trigger, the output of which is the second additional output, are additionally introduced into the control unit a control unit connected to a control input of the fourth input signal switch, the first input of which is connected to the output of the OR-NOT element, and the output and second input of the fourth input signal switch are respectively, the output and the third additional input of the control unit, and the first and second inputs of the second OR element are connected respectively to the second input of the second trigger, and with an additionally connected output of the DSC signal decoder, the additional input of which is the first additional input of the control unit, and the additional output of the DSC decoder combined with an additional input of the first OR element and with the first input of the third OR element, the second input of which is the second additional input of control, the first additional output of which is the additionally connected output of the second trigger.

In each control panel, a second output signal switch and a fifth input switch are additionally introduced into the signal compression device, the output of which is the output of the signal compression device, the input of which is the input of the second output signal switch, the first output of which is connected to the input of the first memory block, the output of which is connected to the first input of the fifth input signal switch, the second input of which is connected to the second output of the second output signal switch, the control input of which is combined with the control m input of the fifth switch of input signals and is an additional control input of the signal compression device, the additional clock input of which is the clock input of the first recording counter.

In each control panel, a third output signal switch and a sixth input signal switch are additionally introduced into the signal expansion device, the output of which is the output of the signal expansion device, the input of which is the input of the third output signal switch, the first output of which is connected to the input of the second memory block, the output of which is connected to the first input of the sixth switch of input signals, the second input of which is connected to the second output of the third switch of output signals, the control input of which is combined with the control input of the sixth input signal switch, with an additional input of the clock synchronization unit and is an additional input of the signal compression device, the additional clock output of which is an additional clock output of the clock synchronization unit.

The electrical structural diagram of the proposed departmental system of two-way high-speed radio communication with efficient use of the radio frequency spectrum is shown in FIG. one; in FIG. 2 shows an electrical structural diagram of one of the versions of the UVHCH PPK; in FIG. 3 is a timing diagram explaining the operation of the system.

Departmental system of two-way high-speed radio communication with efficient use of the radio frequency spectrum, consisting of R PPK 1, each of which contains a series-connected source of analog signal 2, encoder 3, the first input signal commutator 4 ₁ , the signal compression device 5, the second input signal commutator 4 ₂ , modulator 6, 7 RPdU, radio switch 8 and RPU 9, a demodulator 10 connected in series, the signal expansion unit 11, the first switch output signal on January _12, decoder 13 and receiver analogous ovogo signal 14 as well as receive antenna 15, which input-output connected to a further connecting the output RPdU 7, digital signal source 15 whose output is connected to another input of the first switch input signals on April _1, the receiver digital signal 17, whose input is connected to the other the output of the first switch of the output signals 12 ₁ , the control input of which, which is the control input of the signal source PPK 1, is combined with the control input of the first switch of the input signals 4 ₁ , signal conditioner DSC 18, to the control 19 and the demodulator of the clock signal 20, the input and output of which is connected respectively to the input of the demodulator 10 and the first input of the control unit 19, the second input of which is connected to the control output of the signal compression device 5, the control input of which is combined with the control input of the RPDU 7, with the control the input of the radio signal switch 8, with the control input of the demodulator 10 and with the output of the control unit 19, the third input of which, which is the control input of the signal transmission DSC PPK 1, is combined with the control input of the second switch ora input signals April ₂ and to the control input of the DSC signal 18 and output clock input of which is connected respectively to the other input of the second switch input signals April ₂ and a clock input signal compression unit 5. The fourth input 19 is input to the control unit 1 in the installation AUC standby mode "reception", and the fifth and sixth inputs of the control unit 19 are connected respectively to the clock output of the signal expansion device 11 and to the additionally connected output of the demodulator 10.

In addition, each control panel 1 contains a clock shaper 31 and UVCHS 32, the first control input of which is the control input for selecting the optimal communication frequency of control panel 1, and the second control input, control output, control output-input, channel output, and channel input-output of UOVKS 32 are connected respectively with the first additional output of the control unit 19, with the first additional input of the control unit 19, with an additional control input-output RPDU 7, with an additionally connected input of the demodulator 10 and with corresponding channel outputs-inputs RPU 9.

The input of the pulse shaper 31 is connected to the additional clock output of the signal expansion device 11, and the first, second, third and fourth outputs of the pulse shaper 31 are connected respectively to the additionally connected clock input of the DSC 18 signal shaper, with an additional clock input of the signal compression device 5, s the external synchronization input of the discrete signal source 16 and with the external synchronization input of the encoder 3, while the control input of the clock shaper 31 is combined with additional the corresponding control input of the signal compression device 5, with an additional input of the signal expansion device 11 and with a second additional output of the control unit 19, the second and third additional inputs of which are respectively the input of the control panel 1 into the simplex radio mode and the input of the control panel 1 in the “receive” mode or "transfer."

In each control panel 1, the signal compression device 5 consists of a first memory block 21 ₁ , a first write counter 22 ₁ , a first phasing block 23 ₁ , a first read counter 24 ₂ , a second switch of output signals 12 ₂ and a fifth switch of input signals whose output is the output of the device signal compression is 5, the input of which is the input of the second switch outputs of February _12, the first output of which is connected to the input of the first memory unit 21 ₁ whose output is connected to the first input of the fifth switch input signals April _5, to a second input orogo connected to the second output of the second switch output signal on February _12, control input of which is combined with a fifth control input of switch input signals on May ₄ and an additional control input signal compression unit 5, an additional clock input of which it is the first recording clock input of the counter ₂₂ January.

The output of the first readout counter 24 _{1 is} combined with the readout control input of the first memory unit 21 ₁ and with the first input of the first phasing unit 23 ₁ , the second input of which is combined with the write control input of the first memory unit 21 ₁ and with the output of the first write counter 22 ₁ , control input which is connected to the first output of the first phasing unit 23 ₁ , the second output of which is connected to the control input of the first readout counter 24 ₁ , the clock input of which is the clock input of the signal compression device 5, the control input and whose control output is respectively the control input and the control output of the first phasing unit 23 ₁ .

In each control panel 1, the control unit 19 contains the first OR 25 ₁ element, the first 26 ₁ and second 26 ₂ triggers, the third input signal switch 4 ₃ , the OR-NOT 27 element, the DSC 28 signal decoder, the fourth input signal switch 4 ₄ , the third trigger 26 ₃ , the second element OR 25 ₂ , the output of which is connected to the first input of the third trigger 26 ₃ , and the third element OR 25 ₃ , the output of which is connected to the second input of the third trigger 26 ₃ , whose output, which is the second additional output of the control unit 19, is connected with the control input of the fourth switch in April _4-period signal, the first input of which is connected to the output of OR-NO element 27.

The output and second input of the fourth switch of the input signals 4 ₄ are respectively the output and the third additional input of the control unit 19, and the first and second inputs of the second element OR 25 _{2 are} connected respectively to the second input of the second trigger 26 ₂ , and with the additionally connected output of the DSC signal decoder 28 , the additional input of which is the first additional input of the control unit 19, and the additional output of the signal decoder DSC 19 is combined with an additional input of the first element OR 25 ₁ and with the first input the third element OR 25 ₃ , the second input of which is the second additional input of the control unit 19, the first additional output of which is the additionally connected output of the second trigger 26 ₂ .

The output of the DSC 28 signal decoder is combined with the first input of the first OR element 25 ₁ and with the first input of the first trigger 26 ₁ , the output of which is connected to the control input of the third input signal switch 4 ₃ , the output of which is connected to the first input of the OR-NOT 27 element, the second input which is connected to the output of the second trigger 26 ₂ , the first input of which is connected to the output of the first element OR 25 ₁ .

The first and second inputs of the third input signal switch 4 ₃ , the second input of the first trigger 26 ₁ , combined with the second input of the first OR element 25 ₁ , the second input of the second trigger 26 ₂ , the first and second inputs of the DSC signal decoder 28, are respectively the first, second, the third, fourth, fifth and sixth inputs of the control unit 19.

In each control panel 1, the signal expansion device 11 consists of a second memory block 21 ₂ , a second write counter 22 ₂ , a second phasing block 23 ₂ , a second read counter 24 ₂ , a clock synchronization block 29, a cyclic synchronization block 30, and a third output signal switch 12 ₃ and the sixth input signal switch 4 ₆ , the output of which is the output of the signal expansion device 19, the input of which is the input of the third output signal switch 12 ₃ , the first output of which is connected to the input of the second memory block 21 ₂ , the output of which connected to the first input of the sixth input signal switch 4 ₆ , the second input of which is connected to the second output of the third output signal switch 12 ₃ , the control input of which is combined with the control input of the sixth input signal switch 4 ₆ , with an additional input of the clock synchronization unit 29 and is an additional input signal compression device 11, the additional clock output of which is the additional clock output of the clock synchronization unit 29.

The input of the loop synchronization unit 30 is combined with the input of the signal expansion device 11 and the input of the clock synchronization unit 29, the first and second outputs of which are connected respectively to the clock input of the second readout counter 24 ₂ and to the clock input of the loop synchronization block 30, combined with the clock input of the second write counter Feb. _22, and a clock output signal which is the expansion device 11, the output of the second write counter February ₂₂ integrated with the control input of the recording unit 21 of the second memory ₂ and to a first input of the second phasing unit Bani February _23, the second input of which is combined with the control input of the reading of the second memory unit 21 ₂ and with the output of the second read counter Feb. _24, a control input coupled to a first output of the second block phasing February _23, the second output of which is connected to the control input of the second write counter 22 ₂ , and the control input of the second phasing unit 23 _{2 is} connected to the output of the cyclic synchronization unit 30.

Departmental system of two-way high-speed radio communication with efficient use of the radio frequency spectrum operates as follows.

In RPU 9 of each aircraft control panel, K are used for receiving frequency channels, combined by antenna inputs and connected to a transceiving antenna 15 in the “receive” mode, for simultaneous reception of K ₁ , P ₂ , ..., P _K with K independent frequency channels of reception the output voltage of each receive channel P _j with serial number j = 1,2, ..., K in digital form.

In the KB (3-30) MHz band and the upper part of the CB (0.3-3) MHz band, the work of the aircraft due to the variability of the parameters of the radio lines depending on the time of day, season, and level of solar activity [9, 12] is carried out in accordance with frequency schedule, compiled for each work shift with a duration of L hours of continuous operation of aircraft, counted according to a single time system.

The frequency schedule is compiled based on the results of short-term forecasting of the conditions of ionospheric propagation of radio waves or according to the results of more accurate operational forecasting with sounding of the ionosphere [12] within a specific region of the system on land or at sea with a radius of up to 1000 km or more (depending on the radiation power used RPDU as a part of each PPK).

In accordance with the frequency schedule, each work shift of L hours is divided into m time intervals each of duration T _i = L / m, where i = 1, 2, ..., m determines the sequence number of each time interval T _i within L hours, and for each time interval T _i , a corresponding group is allocated from K allowed for communication optimal working frequencies (ORC) f _1Ti , f _2Ti , ..., f _KTi , each of which f _jTi is assigned a serial number j = 1,2, ..., K, which coincides with the serial number of the receive channel P _j , tuned to this ORC for work s within the time interval T _i , and each group of K ORC is formed from the corresponding frequency interval Δ _{f Ti} = (0.7-0.9) • f _{MFC Ti} , where f _{MFC Ti} is the maximum applicable frequency in the time interval T _i determined by the results of short-term forecasting of the conditions of ionospheric propagation of radio waves.

Considering that in BCC modern multichannel digital RPUs and modern RPdUs should be used, which should be RPU 9 and RPdU 7 respectively in each control panel and which allow programming the necessary number of tuning channels or the so-called pre-prepared channels (ZPC) for receiving or transmitting [ 7], then the start of each work shift in electronic memory each reception channel P _j RPU 9 of each recorded as a PEP receiving ZPK m CFP corresponding values _{f jT1, f jT2, ...,} f jTm, allowed to work at appropriate time intervals T _1, T _2, ..., T _m of the frequency according to the schedule, and in electronic memory each transmission channel BCC AUC recorded as ZPK transmit all Q = K • m CFP values according to the frequency schedules.

Before each successive time interval T _{i of} operation of the aircraft occurs, all K reception channels P ₁ , P ₂ , ..., P _{K of} each PPC are _{simultaneously tuned} to the corresponding K PPC reception f _1Ti , f _2Ti , ..., f _KTi . This makes it possible to minimize the tuning time of the receive and transmit channels in accordance with the frequency schedule.

For example, the values of the first group of K ORC (f _1T1 , f _2T1 , ..., f _KT1 ), allowed for the operation of the aircraft in the first time interval T ₁ , are recorded in the first cells of the electronic memory of the corresponding K reception channels of RPU 9 of each control panel - one value ORC for each channel of reception of each PPK. The values of the second group of K ORC (f _1T2 , f _2T2 , ..., f _KT2 ) allowed for the operation of the BCC on the second time interval T ₂ are recorded in the second cells of the electronic memory of the corresponding K channels of reception RPU 9 of each control panel - also one value of ORC for each receive channel, etc. .. As a result, for each j-th receive channel P _j RPU 9 of each control _panel , m values of ORCH-PPC (f _jT1 , f _jT2 , ..., f _jTm ) will be recorded that are allowed to work on the corresponding m time intervals (T _1, T _2, ..., T _m) according to the frequency scheduling sun on one shift length L aces.

If at the time of changing the frequencies of one of the ACPs the aircraft continues to receive information on one of the reception channels of the RPU 9, then the frequency of this reception channel is tuned after the communication session, i.e. after setting this control panel to its initial state - standby mode "reception". The frequency tuning of the reception channels of the RPU 9 and the transmission channel of the RPDU 7 of each control panel is performed according to the digital signals generated by the UVCHS 32, which can interact with the RPU 9 and the RPDU 7, for example, by information exchange via the Gigabit Ethernet interface [7].

In this case, the first time interval T ₁ for each PPC must begin at the beginning of each work shift, i.e. with the start of every L hours of continuous operation of the aircraft within 24 hours. For example, the first work shift with a duration of L = 6 hours should start at 00 hours, 00 minutes, 00 seconds, counted in UHVS 32 according to a single accurate time system. Accordingly, the first interval T ₁ will begin at the same time and before the beginning of the first interval T _1, all reception channels of the RPU 9 of each control _panel should be tuned to the corresponding frequencies f _1T1 , f _2T1 , ..., f _KT1 . When m = 2, the moment of the beginning of the second interval should be counted in this case from 3 hours, 00 minutes, 00 seconds, and before the end of the first interval T ₁ , for example, at 2 hours, 59 minutes, 45 seconds, synchronous tuning of the reception channels of the RPU 9 should be performed of all _ACS for the next group of operating frequencies f _1T2 , f _2T2 , ..., f _KT2 in accordance with the frequency schedule of this work shift.

Each AIC aircraft before the start of a duplex or simplex communication session or after the communication session is completed, is set to its initial state - standby mode "reception", by applying to the input "Ex. PFP "(the fourth input of the control unit 19) of the pulse signal in the form of a short-term logical level" 1 ". In the control unit 19, the pulse signal transfers the second trigger 26 ₂ to a single (inhibitory) state, and its output logic level “1” blocks the control signal from the output of the third input signal switch 4 ₃ to the output of the “OR-NOT” element 27. From the output element "OR NOT" 27 in this case, the first input of the fourth switch of the input signals 4 ₄ receives the logical level "0".

At the same time, the pulse signal from the input of the control panel “Ex. PFP "through the second element" OR "25 ₂ is fed to the first input of the third trigger 26 ₃ , setting it to zero, and its output logic level" 0 "is fed to the control input of the fourth switch of input signals 4 ₄ of the control unit 19, from the second additional the output of which this logical level is fed to the additional control input of the signal compression device 5 and to the additional input of the signal expansion device 11. As a result, the signal compression device 5 and the signal expansion 11 are installed in their main mode - compression and expansion of the signal (increase the transmission rate of binary symbols by half and reduce the speed of the received signal by half), as in the known system [10], since the second switch of output signals 12 ₂ and the fifth switch of input signals 4 ₅ provide input connection and the output of the first memory unit 21 _1, respectively to the input and output of the signal compression device 5, and the third switch output signal ₁₂ March and sixth switch input signals April ₆ permit connection of input and output of the second memory block ₂₁ February sootvets venno to input and output signal expansion device 11. Furthermore, the fourth switch input signals April ₄ provides switching element output signal "NOR" 27 to the output control unit 19. In this case, as in the known system [10], the logic level “0” from the output of the control unit 19, arriving at the control input of the RPDU 7, at the control input of the switch of the radio signals 8 and the control input of the demodulator 10, blocks the output signal of the RPDU 7 at the input of the transceiver antenna 15 and provides the connection of the transceiver antenna 15 to the input RPU 9 through the radio signal switch 8.

In the “receive” mode, the resulting oscillation received by the transceiver antenna 15 can be a combination of various types of interference and signals, which can be called the resulting oscillation. This oscillation is fed to the antenna input of the RPU 9, which is common to all K reception channels of the RPU 9, which are tuned before starting each time interval T _i to the corresponding group of K different frequencies in accordance with the frequency schedule. In RPU 9 of each control panel, each receiving channel P _j amplifies the received signal, converts it to digital form, main frequency filtering with the necessary bandwidth, transfers the spectrum of the received signal from the tuning frequency to zero frequency with the transition to representing the signal as quadrature samples, and the output of the quadrature samples of the output signal of each reception channel of the RPU 9 to the corresponding input-output of the UHCO 32, for example, through the Fast Ethernet interface specification 100 Base - TX [7].

The exchange of information between any two control panels using sources of analog signals 2 and recipients of analog signals 14 is carried out by applying to the input “Ex. IS "(control of the signal source) of each of the interacting control panels of the logic level" 0 ". In this case, the first input signal switch 4 ₁ connects the output of the encoder 3 to the input of the signal compression device 5, which provides the conversion of an analog, for example, telephone (TLF) signal from the output of the analog signal source 2 into a binary stream, and the first output signal switch 12 ₁ connects the output the signal expansion device 11 to the decoder 13, which performs the inverse operation of converting the received binary stream into an analog signal, which is then fed to the receiver of the analog signal 14.

Information exchange using discrete information sources 16 and discrete information recipients 17 is carried out by applying to the input “Ex. IS ”of each of the interacting control panels of the logic level“ 1 ”, in which the first input signal switch 4 ₁ connects the output of the discrete information source 16 to the input of the signal compression device 5, and the first output signal switch 12 ₁ connects the output of the signal expansion device 11 to the discrete information receiver 17.

In this case, the first switch of the output signals 12 _{1 can be set} into a signal branching mode (for example, using local controls) in which the input binary signal from the output of the signal expansion device 11 can simultaneously be input to the decoder 13 and to the input of the receiver of the discrete signal 17 outside depending on the control commands at the input IS "PPK. This allows auditory control of the received discrete signal and the reception of voice control commands from the interacting control panel in the pauses between the reception of individual digital information files, for example, commands to change the communication frequency when the quality of the received information deteriorates.

For a more detailed description of the principle of operation of the AUC we consider its operation with one of the versions of the UHES 32, the structural diagram of which is shown in FIG. 2.

This option of UHF 32 includes an Ethernet switch, the inputs and outputs of which are UHF 32 inputs and outputs, as well as K group signal subchannel level analyzers (AUPGS), K temporary duplex signal detectors (OSMD), a hardware analysis and control unit (BAUTS), and a unit for determining the location and time stamps (BOMMTV), the inputs and outputs of each of which are connected to the corresponding outputs and inputs of the Ethernet switch, the control output-input and channel output of which are respectively the control output ohm-input and channel output of UHF 32, the control input and control output of which are respectively the control input and control output of BAUTS, the control input of which selects the optimal communication frequency (SFN) of which is the control input of the choice of SFN UHF 32, and, accordingly, the control input of the choice of SFN PPK one.

In this embodiment, UHF 32, the output voltage of each receive channel P _j RPU 9 with serial number j (j = 1,2, ..., K), presented in digital form, is fed through the Ethernet switch to the input of the AUPGS with the same serial number j.

In duplex radio communication between any two PPCs, each of them periodically switches from the “receive” mode to the “transmit” mode with a frequency of F = 1 / T _c , where T _c is the duration of one cycle of the “receive” - “transfer” switchings, and transmits to broadcast on one of the allowed ORF sequences regularly following at the corresponding time intervals “transmission” of quanta of a group signal modulated by a binary signal, each of duration T _c / 2, and the group signal is formed as an OFDM signal consisting of N orthogonal subchannel signals with a frequency interval between adjacent subchannels equal to Δf = 1 / T _gs , where T _gs is the duration of sending a group signal [10]. For brevity, such a sequence of quanta of a group signal will be called in accordance with [1] a group signal of temporary duplex (GSVD).

With single-frequency simplex radio communication, each control panel receives in the “receive” mode and emits in the “transfer” mode at the same frequency a group signal of the same structure, which is only continuous within each “transmission” time interval. Such a signal, by analogy with the GSD, will be called the group signal of a single-frequency simplex (GSOS). In this case, the GSVD and GSOS are modulated either by the binary DSC signal from the DSC signal generator 18, or by the information binary signal from the source of the discrete signal 16, or from the source of the analog signal 2 converted to digital form in the encoder 3).

Given the structure of the GSVD and GSOS, which can be transmitted to any of the K carrier frequencies during the operation of the aircraft within the corresponding time interval T _i , for the continuous analysis of the structure of the received oscillations at the output of each receiving channel P _j RPU 9 it is required that each of K AUPGS contained, for example, N digital filters, where N (as noted above) is the number of frequency subchannels in the structure of the group signal used in the BCC.

The passband of each of the N filters should provide the selection from the multi-frequency group signal, presented in digital form at the output of the receive channel, of the voltage of the corresponding frequency subchannel with a passband Δf = 1 / T _gf . At the same time, in each AUPGS with serial number j corresponding to the serial number of the receiving channel P _j RPU 9, the output voltage of which is filtered out, a continuous assessment is made (in relative units) of the instantaneous values of the output voltage of each filter in real time and the average voltage level of each filter, as well as instantaneous values of the total voltage from the outputs of all N filters in real time and the average level of the total voltage from the outputs of all N filters. Moreover, when receiving by any reception channel an RPM 9 of the GSWD, the average voltage level of each frequency subchannel and the average level of the total voltage N of the subchannels should be evaluated in UVCHS 32 based on the results of the reception of only successive quanta of a group signal (excluding reception at other time intervals, on which the group signal is not transmitted) with the integration time constant of the results of the evaluation of the received signals exceeding the period of fading of the signal arriving at the receiving point after reflection from the ionosphere.

Similarly, the average interference level at the output of each reception channel P _j RPU 9 can be estimated in UHF 32 of each BCP when the GSVD or GSOS at the carrier frequency f _{jTi of the} tuning of this reception channel is not broadcast by other BCPs.

The results of evaluating the output voltages of the digital filters of each AUPGS with serial number j are transmitted through the Ethernet switch to the BAUTS in the form of digital data for subsequent analysis. At the same time, the current data (without averaging) on the estimates of the level of the total voltage from the outputs of the N filters of each AUPGS are fed through the Ethernet switch to the corresponding OSMD with the same serial number j. In each j-th OSMD, digital data on the estimates of the level of the filtered group voltage of the corresponding j-th receiving channel P _j are checked for whether or not the received signal is a temporary duplex signal transmitted by one of the R ACCs. For example, as a detector of a temporary duplex signal, you can use a digital amplitude detector, the output binary signal of which is continuously checked for compliance (with a certain degree of certainty) of the control binary sequence (square wave), a similar sequence generated in each control panel at the output of the control unit 19.

The serial numbers of those OSVDs in which the temporary duplex group signal was detected are transmitted through the Ethernet switch to the BAUTS in the form of digital data. In BAUTS, a continuous analysis of digital data coming from each of the K AUPGS and each of the K OSVDS is performed. The results of the analysis in visual form can be displayed on a panel or display as part of the UVCHS 32 for continuous monitoring of the estimates of the following data (within each time interval T _i ), the use of which significantly affects the noise immunity of radio communications between any two control panels:

1. The voltage levels at the output of each receiving channel P _j RPU 9:

- in the partial band Δf of each of the N frequency subchannels of the group signal;

- in the total band ΔF = Δf • N of all subchannels.

This data can characterize in real time the busyness of communication channels at each time interval T _i in real time and the relative level of interference in each communication channel.

2. The serial numbers of those reception channels P _j RPU 9, according to the analysis of the output oscillations of each of which revealed that there is a reception:

a) GSVD (if it is revealed in the corresponding ALCS that the average voltage levels of the subchannels of the group signal differ slightly from each other and the average level of the total voltage N of the subchannels is not lower than the selected threshold value, and also provided that a group signal of temporary duplex is detected in the corresponding OSVD) ;

b) GSOS (if it is revealed in the corresponding ALCS that the average voltage levels of the subchannels of the group signal differ slightly from each other and the average level of the total voltage N of the subchannels is not lower than the selected threshold value, and also provided that the group signal of the time duplex is not detected in the corresponding OSMD );

c) concentrated over the interference spectrum [15], the spectral components of which fall into the passband of one or several subchannels of a group signal (if the corresponding AUPGS reveals that the average level of interference voltage estimated in the passband of one or more subchannels of a group signal significantly exceeds the average level voltage of each of the other subchannels, as well as under the condition that a signal of temporary duplex is not detected in the corresponding OSVD);

d) interference of the type normal white noise [15], which means that the communication channel at the tuning frequency of this reception channel is not busy (if the corresponding ALCS indicates that the average voltage level of the fluctuation interference estimated in the passband of each of the subchannels is approximately the same, and the average level of the total interference voltage N of the subchannels does not exceed a predetermined threshold value, and also provided that a temporary duplex signal is not detected in the corresponding OSMD).

For the convenience of operation and displaying the results of the analysis in UHF 32, all the reception channels of the RPU 9 of each BPC during the operation on the time interval T _i can be divided into four categories: the first category includes the reception channels corresponding to the reception channels described in paragraph 2a above; the second category includes reception channels corresponding to the reception channels described in paragraph 2b; to the third category — reception channels corresponding to the reception channels given in clause 2c; and to the fourth category — reception channels corresponding to the reception channels given in clause 2d.

In addition, the task of BAUTS in this embodiment of the UHFD 32 is to generate control commands for changing the tuning frequencies (ORCH) of the reception channels of the RPU 9 in accordance with the frequency schedule for each time interval T _i as well as for changing the tuning frequency of the RPUU 7 after selection using the UHVS 32 optimal communication frequencies (SFN). The control commands from BAUTS are received on RPU 9 and RPDU 7 through Ethernet switch UHVS. The necessary accurate time signals for a synchronous frequency change in each aircraft BCP come in digital form from the BOMMTV, which is part of the UHFD. In addition, BOMMTV provides the determination of the coordinates of the location of each BCP, since data on the location of each of R BCPs, dispersion within a region or sea space, must be taken into account when compiling a frequency schedule.

It should be noted that the specific structure of the group signal makes it possible to determine the presence or absence of this signal at the output of any reception channel of RPU 9.

In this embodiment, the UVCHS 32 (Fig. 2), upon detection of a GSVM, modulated by a DSC signal or an information signal, at the output of the reception channel P _j RPU 9 with serial number j related to the reception channels of the first category, BAUKS provides switching of this signal to the channel output UHVS 32 (via an Ethernet switch), provided that its second control input receives a logic level of "1", signaling that the control panel is in the standby "reception" mode, in which a search for GSVD or GSOS modulated by the DSC signal is performed, each m channel reception RPU 9.

From the UHFD channel output 32, the group signal of the jth reception channel P _{j is} supplied in parallel to the inputs of the demodulator clock 20 and demodulator 10, which operate in continuous mode (the operation of the demodulator 10 is not blocked by the control signal at its control input).

At the same time, a positive level logic level “1” is generated at the control output of the UVCHS 32, which is fed to the additional input of the decoder of the DSC 28 signal of the control unit 19 and signals the detection of a gas supply line at the output of the reception channel related to the reception channels of the first category. The duration of this signal should not be less than the time required for the decoder to detect the DSC 28 signal (with the required probability of correct detection) of its address encoded in demodulated quanta of the binary signal at the output of the demodulator 10.

When it detects its address at the output of the DSC 28 signal decoder, a pulse signal is formed - a short-term logic level “1”, which, entering the first inputs of the first trigger 26 ₁ , the first element OR 25 ₁ and the second element OR 25 ₂ , sets the first and second triggers 26 ₁ and 26 ₂ to the zero state, in which the control meander is switched from the output of the clock demodulator 20 (via the third input signal switch 4 ₃ , the OR-NOT element 27 and the fourth input signal switch 4 ₄ ) to the output of control unit 1 9. This ensures the remote transfer of the control unit called for communication to the “slave” state and the duplex operation mode of the “follower” control panel, in which the formation and transmission of 15 quantifications of the GSFM modulated by the “follower” information signal using the RPMD 7 and the transmitting antenna is performed PPK. At the same time, the output of the selected receive channel P _j RPU 9, receiving the GSVD, modulated by the information signal of the “leading” PPC, will be constantly connected to the channel output of the UVCHS 32 of the “slave” control panel, and the control signal will be generated at the control output of the UVCHS 32 - logic level “0” , which blocks the operation of the DSC 28 signal decoder for the duration of the duplex communication session.

At the same time, the UVCHS 32 generates a digital signal supplied to the control input-output of the RPDU 7 to change the tuning frequency of the RPDU 7 in accordance with the tuning frequency of the selected reception channel of the RPU 9.

If it is detected on the time interval T _i GSOS by the receiving channel P _j RPU 9 with serial number j related to the receiving channels of the second category, the SIA 32 also provides switching of this signal to the channel output, provided that its second control input also receives a logic level " 1 ”from the first additional output of the control unit 19. However, in this case, the logic level“ 1 ”of negative polarity will be sent to the additional control input of the DSC 28 signal decoder from the control output of the UVCHS 32, signaling general reception of GSOS. The duration of this signal should also be no less than the time required for the decoder to detect the DSC 28 signal (with the required probability of correct detection) of its address encoded in a continuous binary signal at the output of the demodulator 10.

In this case, when it detects its address in the demodulated binary signal, an impulse signal is formed at the additional output of the DSC 28 signal decoder — a short-term logic level of “1”. This signal, arriving at the additional input of the first element OR 25 ₁ and the first input of the third element OR 25 ₃ , sets the second trigger 26 ₂ to the zero state, and the third trigger 26 ₃ to the single state, in which the control logic level from the input "Ex. Pfp / pwd ”PPC through the fourth switch of input signals 4 ₄ is fed to the output of the control unit 19 (logical level“ 0 ”- receiving GSOS; logical level“ 1 ”- transmitting GSOS), thereby providing a remote translation of the“ slave ”PPC in simplex mode work in which the “slave” control panel as well as the “master” control panel, in the “transmission” mode, can broadcast GSOS, modulated by an information binary signal.

At the same time, the output of the selected reception channel RPU 9, which receives the GSOS from the "leading" PPK, will be constantly connected to the channel output of the UVCHS 32 of the “slave” control panel, and a control signal will be generated at the control output of the UVCHS 32 — logic level “0”, which blocks the operation of the decoder DSC 28 signal for the duration of a simplex communication session.

The tuning of the transmission frequency of the RPDU 7 after the discovery of its address in the binary DSC signal is carried out similarly to that described above.

It should be noted that the formation of three types of control commands at the control output of the UVCHS 32 (in this version of the UVOKS 32 version - logical levels: “1” - positive polarity, “1” - negative polarity and “0” - zero level) simplifies the implementation of the decoder DSC 28 signal and increase its noise immunity from false alarms when searching for your address in a demodulated signal.

In addition, if two or more reception channels belonging to the first and second categories of reception channels are defined in any ACS aircraft in the initial state (with the simultaneous detection of two or more GSVD and GSOS at the outputs of the corresponding reception channels of the RPU 9), then UHCO 32 provides serial switching of the output signals of these reception channels to the channel output with the required holding time interval of each output signal at the input of the demodulator 10, and, accordingly, at the signal input of the DSC 28 signal decoder after group signal demodulation.

The time interval for holding the output signal of each of these reception channels of the RPU 9 at the input of the demodulator 10 should be no less than the time required for the decoder to detect the DSC 28 signal (with the required probability of correct detection) of its address encoded in one of the switched signals.

In this case, the logic levels of positive or negative polarity from the control output of the UVCHS 32 corresponding to the type of signal (GSVD or GSOS) switched to the channel output of the UVCH 32 will be switched to the additional input of the decoder of the DSC 28 signal synchronously with the switched group signals.

Upon receipt of a logical level of "0" at the control input of the UVCHS 32 (after the decoder 28 detects its address in the received binary signal), the serial switching of the signals in the UVCHS 32 is terminated and the output signal of the last commutated receiving channel RPU 9 continues to be fed to its channel output. tuning of the transmission frequency of the RPDU 7 is similar to that discussed above.

If necessary, the installation of any receive-transmit frequency of the “slave” control panel, as well as the “master” control panel, from the number of optimal operating frequencies indicated in the frequency schedule, or automatically selected using the UVCH 32 optimal communication frequency - SFN (by selecting one from the reception channels П _j РПУ 9 with the corresponding serial number j, which coincides with the serial number j of its tuning frequency f _jTi , and related to the reception channels of the fourth category, with a minimum level of interference voltage at its output) can also be omands received by the digital input PSP »PPK (selection management PSP).

To conduct a duplex communication session within the time interval T _i between any two PPCs, it is first necessary to select the SFN “leading” PPC.

The selection of SFN is carried out, as noted above, with the help of the UVCH 32 of the "leading" control panel automatically - when fed to the control multi-bit digital input "Ex. PSP »PPK corresponding digital team. In this case, out of all the K receive-transmit frequencies (ORC) allowed for communication on the time interval T _i in accordance with the frequency schedule, UHCO 32 should provide switching to the inputs of the demodulator 10 and the demodulator clock 20 of the output signal of one of the reception channels П _j RPU 9 with a serial number j corresponding to the reception channels of the fourth category, at the output of which the interference voltage level is minimal with respect to other reception channels of this category.

At the same time, the control digital signal about the number of the selected reception channel generated by the UVCHS 32 is fed to the control input-output of the RPDU 7, ensuring its tuning to the ORCH f _jTi . The digital signal (receipt) on the implementation of adjustment in the opposite direction RPdU 7 is transmitted to the frequency UVOCHS 32. Thereafter, the output signal 32 executed in UVOCHS switching the selected reception channel P _j RPU 9 and setting RPdU 7 CFP f _jTi must be stored in the "master" AUC before entering its entrance OKS ”of the subsequent team about the choice of another SFN.

For example, if you want to use a new _ORF f _jTi with a different serial number, for example, with j = K, if the quality of communication is deteriorating at any interval T _i , i.e. SFN f _KTi , selected by the radio subscriber (radio operator, for example, a “leading” control panel) based on the analysis of data displayed on the UVOKS 32 screen, the new SFN number f _KTi and the exact time of frequency change can be communicated to the interacting “slave” _{control panel} in advance a communication channel (on a previously selected _ORF f _jTi ), for example, using the most noise-resistant coding when transmitting a new number TO SFN f _KTi . The necessary information is recorded, for example, in the BAUKS shown in FIG. 2 versions of the UVCHS 32, each PPC, and at the appointed time determined by BOMMTV, BAUKS UVOKS (Fig. 2) of the interacting PPC will provide their synchronous automatic reorganization to the _PSP f _KTi , the work on which should provide better communication quality.

After choosing before the start of the communication session of the SFN f _KTi , at which a duplex communication session with the “slave” _{control panel} will be conducted, it is required to call the “slave” _{control panel} for communication.

A call is made by submitting to the input “Ex. DSC "of the" leading "PPK (DSC signal transmission control) command in the form of a logical level" 1 ". This level, arriving at the control inputs of the second commutator of the input signals 4 ₂ and the signal conditioner DSC 18, enables the shaper 18 and the switching of its output signal through the second commutator of the input signals 4 ₂ to the input of the modulator 6.

The DSC modulating signal is generated in the form of a binary sequence with the coded and periodically repeated digital address of the PPC called for communication, and the speed of generating the DSC binary signal during a duplex communication session is set twice as fast as the transmission rate of the information binary signal V = 1 / T, where T is the duration of the binary information signal element transmitted from the source of the discrete signal 16, or from the source of the analog signal 2, digitized by the encoder 3.

At the same time, the control logic level is “1” from the input “Ex. DSC "of the" leading "control panel is fed to the third input of the control unit 19, in which it enters the second input of the first OR 25 ₁ element and the second input of the first trigger 26 ₁ , translating the first 26 ₁ and second 26 ₂ triggers to the single and zero states, respectively. In this case, the output of the control unit 19 is switched from the control output of the signal compression device 5 (through the third input signal switch 4 ₃ , the OR-NOT element 27, the fourth input signal switch 4 ₄ ) control signal-meander. This control meander, formed in the signal compression device 5, determines periodically repeating cycles of the “reception” - “transmission” of the “leading” _{control panel} with a frequency F _{c prd1} (“transmission” - logic level “1”, “reception” - logical level “ 0 ").

In each time interval, the “transfer” of the control RPdU 7 meander provides amplification of the signal power from the output of the modulator 6, filtering it from undesirable frequency components in one of the harmonic filter band filter nodes, the transparency band of which ensures the transmission of the transmitted signal [10], and the radiation in broadcast using a transceiver antenna 15 GSVD, modulated by a binary DSC signal.

The original modulating binary sequence of the DSC signal from the output of the second input signal commutator 4 ₂ is fed to the input of the modulator 6, in which it is divided into N parallel flows (N is the number of frequency subchannels of the modulator 6, in each of which the duration of the binary symbols is increased by N times), after which the formation of a multi-frequency OFDM signal (group signal) [10].

At time intervals “receiving” the control meander, the pathogen and the power amplifier are locked as part of the RPDU, as a result, at these time intervals, the necessary attenuation of the noise level from the output of the RPDU 7 and the sensitivity of the sensitivity of the reception channels of the RPU 9 are maintained.

The operation of the “slave” control panel when receiving the DDS modulated by the binary DSC signal is similar to the operation of any other control panel set to its initial state — the standby mode “reception”, and is given above. In addition, it should be noted that the GSVD used in the VSS is a signal in the form of a signal of multi-frequency amplitude telegraphy (AT) [10], which contains, in addition to the basic information contained in the quanta of the group signal, also sync information on the boundaries of time intervals “reception "-"broadcast". This sync information can be used to ensure the synchronous operation of two PPCs without introducing excessive sync information into the transmitted signal.

The synchronization signal corresponding to the control meander of the “leading” control panel is extracted by the demodulator of the synchronous signal 20 of the “slave” control panel, in which the signal is first detected by an amplitude detector, after which the AT signal is regenerated by the regenerator, where the temporal position of the edges of the binary sequence parcels (meander type) is averaged. at the detector output and restoration of the form of the premises as a control meander, ensuring the operation of the slave control panel in antiphase with respect to the work of the master control panel [10].

In view of the periodicity and rather long duration of the period of following the cyclic intervals “transmission” - “reception”, the regenerated meander can be restored with a high degree of reliability.

At the same time, in the “slave” control panel, the received group signal is demodulated by the OFDM signal demodulator 10 in a known manner, after which N synchronous binary streams are converted into a single binary sequence, which is transmitted to the output of demodulator 10 with the broadcast transmission speed V = 2F _{t prm2} = 2F _{t prd1} [10].

Let us consider in more detail the process of establishing and maintaining duplex radio communications.

At the end of the transmission of the DSC signal by the “leading” control panel (when the unit logic level changes to zero at the “DSC control” input), the second input signal switch 4 ₂ connects the modulating information binary sequence from the output of the signal compression device 5 to the input of modulator 6.

The signal compression device 4 operates as follows.

At the input of the device through the first switch of the input signals 4 ₁ , a binary signal can be received either from the output of the encoder 3 (digital speech) or from the output of the source of the discrete signal 16 (data) with a transmission speed V (bit / s). For clarity, the description of the operation, we assume that the input signal is a periodically repeated combination of binary symbols of type 1110010 (Fig. 3A).

In the signal compression device 5, the input signal through the third output signal switch 12 _{3 is} supplied to the first memory block 21 ₁ , which can be a random access memory with separate and independent control inputs for recording and reading information.

The formation of the necessary clock pulse sequences for the first write counter 22 ₁ (F _{t prd1} ), for the first readout counter 24 ₂ , combined at the clock inputs with a DSC 18 signal conditioner (2 F _{t prd1} ), for a discrete signal source 16 (F _{t vs1} ) and for encoder 3 (F _{t vs 2} ) it is produced from one clock _generator 31, which generates these pulse sequences from one reference sequence of clock pulses (F _{t op} ) from the additional clock output of the signal compression device 11, which is formed by it clock synchronization unit 29. Accordingly, this ensures synchronous operation of all the components of the control panel and eliminates possible phase mismatches between the transmitted and received binary signals of the two interacting control panels due to the lack of stability of the reference frequencies of the clock clock generators with the composition of the binary signal sources 16 and the 3 "encoders ”And the“ slave ”control panel with which the corresponding binary signals are generated.

To ensure compression of the binary signal by 2 times at the output of the signal compression device 5, it is necessary that the pulse repetition rate is two times higher than the pulse repetition rate F _{t prd1} .

Capacities M ₁ and M ₂ counters write (22 ₁ ) and read (24 ₂ ) should be determined as follows.

To conduct duplex radio communication, each control panel should periodically switch from receiving to transmitting in antiphase with respect to each other with a frequency of F = 1 / T _c , where T _c is the duration of one cycle “transmission” - “reception”. The duration T _c is selected based on the permissible delay of the digitally converted telephone signal (0.1-0.3) s and the characteristics of the used transceiver means. For radio communication by discrete messages, the value of T _c can be selected over a wider range.

When the bit rate of the binary symbols of the digitized speech signal is equal to V (bit / s), the capacity M _{1 of the} write counter 22 ₁ or the number of binary characters periodically recorded by the write counter 22 ₁ in the memory block 21 ₁ for one cycle of duration T _c = M ₁ T ( binary symbols or clock intervals (TI) of the frequency F _{t prd1} ), you can choose between: M ₁ = T _c / T ~ (0.1-0.3) ⋅V. Moreover, the integer M ₁ must be even to ensure a delay of T _c / 2 between the moments of writing and reading information in the first memory block 21 ₁ .

To ensure compression of the initial quantum of the signal with a duration of T _c in 2 times, the following is performed:

- in the first half of each cycle (time interval “reception” of duration T _c / 2), sequential recording (into the corresponding memory cells of the memory block 21 ₁ ) M ₁ binary symbols of the signal being prepared for transmission is performed;

- in the second half of each cycle (time interval "transfer") from these cells of the memory block 21 ₁ sequential reading of binary information is performed at double speed and with a delay of T _c / 2 in relation to the recording times.

For this, it is necessary that the capacity M _{2 of the} read counter 24 ₁ is 2 times the capacity of the write counter 22 ₁ , i.e. M ₂ = 2M ₁ . Moreover, the first M ₁ addresses of read cells successively replaced at the output of the read counter 24 ₁ with a clock frequency of 2F _{t prd1} must correspond to the addresses of the memory cells into which M _{1 the} input characters of the first memory block 21 ₁ were recorded, and the subsequent M ₁ read addresses should correspond to cells, in each of which the symbol "0" is constantly recorded.

Accordingly, the number of memory cells in the memory block 21 _{1 of the} signal compression device 4 must be at least M ₂ .

For clarity, in FIG. 3a, the cycle time T _c in clock intervals (TI) or the capacity M _{1 of the} write counter 22 _{1 is} taken to be M ₁ = 16, the capacity of the read counter 24 ₁ -M ₂ = 32. In this case, a 4-bit binary counter can be used as a write counter 22 ₁ , and a 5-bit binary counter as a read counter 24 ₁ .

Each state of the recording counter (in the case under consideration, from 0 to 15) has its own memory cell in the memory block 21 ₁ , into which a logical level is written corresponding to the binary symbol at the input of the memory block and which is stored in the cell for one cycle.

In FIG. 3d, d, g, h, and logical levels of memory cells with numbers 1, 2, 3, ..., 15, 16 are shown, corresponding to numbered from 1 to 16 characters of the input binary sequence, conventionally divided into cyclic intervals of duration T _c = 16 TI everyone.

The information is read from the memory cells with a delay of T _c / 2 = 8 TI (or 16 clock intervals of the pulse repetition rate 2F _{t prd1} ).

The required phase relationships between the counters recording and reading are set unit phasing January ₂₃ by comparing the states of the counter (output bit binary numbers) to inputs 1 and 2 of the phasing unit 23 ₁ and the forced initial setting of the counter recording Jan. ₂₂ to a desired state by the control signal from the first output of the block .

In addition, the phasing unit 23 ₁ forms a control square wave with a frequency of binary levels F _{c prd1} , which controls the operation of the control _panel set to the “master” state. Since the outputs of the write and read counters are connected to the inputs 1 and 2 of the phasing block 23 ₁ , the formation of the control signal is quite simple using the output signal of the highest level of the read counter 24 ₁ .

In FIG. 3k shows the output signal of the signal compression device 5, FIG. 3L - control meander of the control unit 19, formed by the phasing unit 23 ₁ in inverse form. The time intervals "transmission" and "reception" of the "leading" control panel are indicated here, respectively, "PR1" and "PFP1".

2 times compressed quanta of the transmitted signal at the end of the action of the unit logical level command at the input DSC ”” of the master ”PPC is fed through the second 4 g input signal switch to the input of modulator 6. To simplify the presentation of the operating principle, it is assumed that the number of parallel frequency subchannels of the modulator 6 seal is N = 8, respectively, the binary symbols of each quantum of the transmitted signal in series the parallel converter of modulator 6 are distributed over eight subchannels for generating a multi-frequency OFDM signal by the OFDM signal generating unit of modulator 6 [10]. At the same time, the duration of each binary symbol of the input quantum is increased by 8 times, and for each frequency interval “transmission” (PR1) of duration T _c / 2 for each of the frequency subchannels of the OFDM signal (group signal) information is transmitted (by the above method) information about the values of only two characters out of every 16 with the duration of the group signal element on the air T _gf = 4T.

Further, the process of generating and transmitting quanta of a group signal of a temporary duplex modulated by an information binary signal is similar to that described above for transmitting a GSV modulated by a DSC signal.

Similarly to the foregoing, the signal compression device 11 of the “slave” control panel and its subsequent devices are used, which provide for the transmission of the GSV modulated by the information signal into the air during duplex transmission of information to the “leading” control panel. However, the quantization of the GSVD quanta begins only after the regeneration of the demodulated control meander and the reception of the DSC signal.

The regenerated control meander, similar to the control meander of the first PPC, with a repetition rate of cycle intervals F _{c prm2} = F _{c prd1} , is shown in FIG. 3m, taking into account the delay of the signal τ _З for the time of its propagation from the transmitter of the first BCP to the receiver of the second BCP. For clarity, it is assumed that the delay value corresponds to the duration of one received binary symbol, i.e. τ _W = T / 2.

In order to form “slave” PPC signal quanta similar to the “master” PPC quantization method, it is necessary to combine the beginning of reading binary characters from the first memory block 21 _{1 of the} signal compression device 5 with the beginning of the “transmission” time interval of the regenerated control meander. This is achieved by forcing the readout counter 24 ₁ to the required state by a signal from the second output of the first phasing block 23 ₁ in accordance with the temporary position (phase) of the “transfer” intervals of the regenerated control meander, which is fed to the control input of the first phasing block 23 ₁ after finding its address in the signal from the DSC.

In FIG. 3n, the temporal boundaries of the quanta of the group signal transmitted by the “slave” control panel are conventionally indicated at the input of the radio signal switch 8 of the “master” control panel taking into account the propagation delay of the signal from one set to another. In this case, the total delay of the received by the "leading" PPK signal quanta in relation to the transmitted ones is 2 τ _s .

Consider the process of receiving the "leading" PPK GSVD, modulated by the information signal, after receiving the "slave" PPK GSVD, modulated by the DSC signal.

We will assume that in the “slave” control panel the initial signal at the input of signal compression device 5 is similar to that previously considered (Fig. 3a), but with a phase shift (temporary position) of the binary sequence relative to the control square wave (Fig. 3m).

The radio signal switch 8 of the first PPC, controlled by the meander (Fig. 3l), formed by the signal compression device 5, will switch in time intervals PRM1 (“reception”) to the input of the RPU 9 quanta of the received group signal truncated at the ends by 2τ _s . The envelope shape of these quanta corresponds to the output signal of the clock demodulator 20 shown in FIG. 3o (in the absence of any interference at the input of the RPU 9).

The OFDM signal demodulation unit as part of the demodulator 10 performs an operation inverse to the operation performed by the OFDM signal forming unit of modulator 6 [10]. At the same time, N = 8 binary streams are formed at its output, which are converted by a parallel-serial converter (as part of demodulator 10) into a common stream with a speed of 2F _{t prd1} (Fig. P).

The shortening in duration of each quantum of the high-frequency signal received from the ether by the radio signal switch 8 by a value of 2τ _s will not affect the noise immunity of receiving binary information. The number of frequency subchannels N, determining the increase in the duration of the binary symbol (after doubling the transmission rate) in each channel by N times (T _e = NT / 2), is selected based on ensuring the required value of the guard interval when transmitting high-speed information over the KB communication channel [13] , which is significantly larger than 2τ _s .

Moreover, only the part of the quantum of the signal corresponding to the last binary symbol in each subchannel is subjected to a decrease in duration (in our example, with N = 8 and T _c = 16 TI, the last is the second symbol of each subchannel - Fig. 3o). In reality, during the implementation of the system, T _c is chosen to be much larger than 16 TI, for example, at T _c = 0.2 s, N = 8 and at a data transfer rate of 4800 bit / s on the KB channel, in each quantum of signal for each 8 frequency subchannels transmit L = 0.2 • 4800/8 = 120 binary characters, i.e. the last in the subchannel will be the 120th character).

From the output of the demodulator 10, a discrete signal is supplied to the signal expansion device 11, in which this signal is fed to the inputs of the clock synchronization unit (BTS) 29 and the cyclic synchronization unit 30, as well as to the input of the second memory block 21 ₂ through the third output signal switch 4 ₃ . In the signal expansion device 11, an operation inverse to the signal compression operation is performed. To do this, the BTS 29 determines the temporal position of the boundaries of the binary elements from the output of the demodulator 10 and generates the corresponding sequences of clock pulses F _{t prm1} , 2F _{t prm1} (Fig. 3p, t), providing synchronous recording of information in the second memory block 21 ₂ and its reading with the second write counter 22 ₂ and the second reading counter 24 ₂ , the capacity of which is equal to the previously determined values of M ₂ and M ₁ , respectively.

The sequence of clock pulses 2F _{t PRM1} and F _{t PRM1} can be formed at the outputs of the intermediate frequency dividers BTS 29 by dividing the frequency of the master oscillator having high stability. The phase of pulses at the output of the dividers can be changed using a phase-locked loop by adding or subtracting pulses in a sequence of pulses with a higher frequency in accordance with the phase change of the input binary symbols [15, p. 252]. In a similar way, a sequence of reference pulses F _{t op} is formed at the additional output of BPS 29, which is phase-adjusted in accordance with the phase change of the input binary signal and supplied to the input of the clock pulse shaper 31. The pulse repetition rate of this sequence must be a multiple of the frequency F _{t prm1} , t. e. F _{t op} = k • F _{t prm1} , where k is an integer. The choice of the frequency F _{t op} (at the output of one of the intermediate frequency dividers BPS 29) is made depending on the requirements for the pulse shaper 31, which ensures the formation of the necessary clock sequences of pulses by dividing the reference frequency F _{t op} by the corresponding division factors. This formation of synchronous clock frequencies for the operation of the receiving and transmitting components of each control panel provides, as noted above, a reliable synchronous duplex data exchange between each two control panels of the communication system.

The necessary delay by half the cycle interval T _c / 2 of the moments of reading binary information regarding the moments of recording is provided by setting the second read counter 24 ₂ in the required state by the control signal from the first output of the second phasing block 23 ₂ .

In addition, it is necessary that the beginning of the recording in the second memory block 21 _{2 of the} sequence of binary information symbols of each demodulated quantum of the signal (Fig. 3p) coincides with the arrival of the first binary symbol of the demodulated quantum, i.e. the first character of the demodulated quantum of the signal must be written in the first memory cell of block 21 ₂ , the next second character, etc., in the second cell

The necessary phasing of the second recording counter 22 _{2 is} provided by a control signal from the second output of the phasing block 23 ₂ in accordance with the temporary position (phase) of the cyclic pulses F _{cs prm1} (Fig. 3c) from the output of the cyclic synchronization block 30. As a cyclic clock signal contained in each cycle of the demodulated signal, you can use a sequence of M ₁ zero binary characters following the last information symbol of the demodulated quantum of the signal (Fig. 3P).

In order to exclude the appearance of 10 “false” symbols “1” at the output of the demodulator after the last information symbol of each demodulated quantum of the signal (due to the action of noise at its input), the operation of the OFDM signal demodulation unit as part of the demodulator 10 is blocked by the control meander from the output of the control unit 19 at time intervals "PRD1" [10] (Fig. 3L).

To ensure the operation of the BCS 30, a signal from the output of the demodulator 10 is supplied to its information input, and a sequence of clock pulses from the second output of the BTS 29 is supplied to its clock input.

The result of reading information from the second memory unit 21 ₂ is shown in FIG. 2y From the output of the memory unit 21 _2, this binary signal is fed to the output of the signal expansion device 11 through the sixth input signal switch 4 ₆ and then switched by the first output signal switch 12 ₁ to the input of the decoder 13, where it is converted into an analog TLF signal, which is then fed to the receiver analog signal 14.

Similarly, the reception of the information signal by the “slave” control panel during duplex radio communication after receiving the DDS modulated by the DSC signal occurs. In contrast to the reception of information by the “leading” control panel, the received signal quanta are not shortened here because the “PFP 2” time intervals of the regenerated control meander coincide with the duration of the quanta of the binary sequence of the demodulated signal.

Consider the work of the same two PPC when conducting a simplex communication session.

In the initial state (before the start of the communication session), as well as during duplex operation, each control panel is set to standby mode “reception” by applying to the input “Ex. PFP "pulse signal similar to the above.

Before starting a simplex communication session, the communication initiator, the “leading” control panel, is set to simplex mode of operation by applying “Set. SR "(setting the simplex mode of operation) of the pulse signal in the form of a short-term logical level" 1 ". Acting on the second additional input of the control unit 19, this signal is fed through the third element OR 25 ₃ to the second input of the third trigger 26 ₃ , setting it in a single state. Logical level “1” from the output of this trigger goes to the control input of the fourth switch 4 ₄ and provides switching of control logic levels from the input “Ex. Pfd / pfd ”(control of the“ receive ”/“ transmit ”modes) to the output of the control unit 19. In this case, the control logic level is“ 0 ”at the input“ Ex. Pfp / pfd ”puts the control panel in the“ receive ”mode, ensuring the reception of signals during the duration of this level, and the control logic level“ 1 ”at this input puts the control panel in the“ transmit ”mode. Thus, the control of the control panel for this input is similar to the control of a simplex radio station in the mode of reception and transmission using the tangent.

At the same time, when e 5, the operation of the signal expansion device 11 is blocked and each of them is switched to the binary signal switching mode from the input to the output of the corresponding device. In this case, the logic level "1" from the second additional output of the control unit 19, arriving at the control input of the pulse shaper 31, at the additional control input of the signal compression device 5 and at the control input of the signal expansion device 11 provides the following:

1. In the shaper of clock pulses 31, the frequency of the clock pulses at its first output (2F _{1 prd} ) is halved, providing the formation of a binary DSC signal by block 18 with the same speed F _1prd as the transmission speed of information symbols at the input of the signal compression device 5 .

2. In the signal compression device 5, the logic level “1”, arriving at the control inputs of the fifth input signal switch 4 ₅ and the second output signal switch 12 ₂ , provides a binary signal from the output of the first input signal switch 4 ₁ to the input of the second input signal switch 4 ₂ .

3. In the signal expansion device 11, the logic level “1”, arriving at the control inputs of the sixth switch of the input signals 4 ₆ and the third switch of the output signals 12 ₃ , transfers the binary signal from the output of the demodulator 10 to the input of the first switch of the output signals 12 ₁ . In addition, the logic level "1", arriving at the additional input of the BTS 29, provides a decrease in the speed of clock pulses at the second output of the BTS 29 (2F _{t prm1} ) 2 times (F _{t prm1} ), i.e. in accordance with the speed of the received binary characters at the output of the demodulator 10.

Further, for conducting a simplex communication session, it is required to select the optimal communication channel by the “leading" control panel. The choice is made by submitting to the input "Ex. SFN "of the" leading "control panel of the impulse command in the same manner as during the duplex communication session described above.

After that, the “leading” control panel must transmit the GSOS, modulated by the DSC signal, by simultaneously supplying “Ex. DSC ”and the input“ Ex. Pfp / pwd ”command in the form of a logical level“ 1 ”.

GSOS, modulated by the DSC signal, is generated and broadcast on the air as a continuous group signal with a coded and periodically repeated digital address of the called PPC. The transmission speed of the DSC signal and the subsequent discrete information in this case is equal to the transmission speed of the main signal V = 1 / T bit / s (T is the duration of the element of the original signal at the output of the first input signal commutator 4 ₁ ). The duration of the DSC signal is determined by the duration of the logic level “1” at the inputs of Ex. DSC ”and“ Ex. Pfp / pfd ”and should not be less than the time interval necessary for reliable detection of the DSC signal in the second (“ slave ”) control panel.

The operation of the “slave” control panel when receiving the GSOS, modulated by the DSC signal, is similar to the work of any other control panel set to its initial state — the standby mode “reception”, and is given above.

Conducting a simplex radio communication session is carried out in a known manner, by sequentially exchanging information with appropriate control of the processes of transmitting and receiving a group signal at the inputs of “Ex. Pfp / pwd ”of each PPC.

From a practical point of view, all the constituent parts of a departmental system of two-way high-speed radio communication with efficient use of the radio frequency spectrum are realizable, which is stated in the presentation of the system and in [10]. Fifth generation radio receivers (such as RPU 9) with direct analog-to-digital conversion open up the possibility of creating multi-channel digital radio receivers based on the principle of “one analog input - many reception channels”, in which the complexity and cost of the RPU as a whole weakly depends on the number of reception channels [7 ]. UHOS 32 can be implemented programmatically, for example, under the Windows operating system. As a hardware platform, mini-PCs with the required speed can be used.

In conclusion, it should be noted that the implementation of the present invention is a departmental system of two-way high-speed radio communications with efficient use of the radio frequency spectrum, will achieve the following advantages compared to the known two-way radio communication systems [5, 6, 10]:

1. To expand the capabilities of the aircraft by providing each two control panels, in addition to single-frequency duplex radio communications, also single-frequency simplex radio communications with remote switching (via radio channel) of any “slave” control panels both to full-duplex radio communication mode and to simplex radio communication at the request of the radio initiator ( "Leading" PPK). In addition, the simplex radio communication mode provides higher noise immunity in relation to the duplex radio communication mode by halving the speed of data transmitted on the air.

2. Significantly reduce the waiting time for any “leading” control panel to communicate with the required “slave” control panel without the use of a duplex base station, a repeater, which provides fast organization of available communication channels between BCC radio subscribers [7, 11].

3. To increase the noise immunity of conducting both full-duplex and simplex radio communications between any two ACS due to the possibility of choosing the optimal communication frequency with a minimum level of additive interference from the corresponding group of optimal operating frequencies, determined by the results of short-term forecasting of the conditions of ionospheric propagation of radio waves for each time interval BCC work.

4. Ensure stable synchronous operation of every two control panels during a duplex communication session, regardless of the duration of the communication session.

Information sources

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2. Shadrin B.G., Zachateisky D.E., Budyak B.C., Alekseenko V.N. Improvement of duplex decameter radio communication systems // Radio communication technology / Omsk Research Institute of Instrument Engineering. - 2015. - Issue. 4. - S. 31-47.

3. Berezovsky V.A., Dulkeit I.V., Shadrin B.G., Budyak B.C. Features of the development and modernization of short-wave radio communication nodes // Special equipment. - 2010 .-- S. 17-24.

4. Kartashevsky V.G., Semenov S.N., Firstova T.V. Mobile networks. - M .: Eco-Trends, 2001.

5. RF patent 2190301 Duplex radio communication system: / A.N. Yuriev, B.N. Yaroshevich, V.I. Levchenko, B.G. Shadrin. - 2002.

6. RF patent 2507683 The method of area duplex communication with temporary diversity channels of reception and transmission / A.N. Yuriev, V.L. Khazan. - 2014.

7. Berezovsky V.A., Dulkeit I.V., Savitsky O.K. Modern decameter radio communication: equipment, systems and complexes / Ed. V.A. Berezovsky. - M .: Radio engineering. 2011 - 444 p.

8 Pat. No. 2428792 of the Russian Federation Automated short-wave communication radio center / V.A. Berezovsky, O.A. Selivanov, I.V. Dulcate, B.G. Shadrin, V.S. Budyak. - 2011.

9. Aizenberg G.Z., Belousov S.P., Zhurbenko E.M. et al. Short-wave antennas / ed. G.Z. Eisenberg. 2nd ed., Revised. and add. M .: Radio and communications, 1985.536 s.

10. Pat. No. 2553091 of the Russian Federation System of duplex high-speed short-wave radio communication / B.G. Shadrin, V.S. Budyak, V.N. Alekseenko. - 2015.

11. Shadrin B.G., Yuryev A.N., Grinenko A.A. Trunking communication system in the range 136 - 174 MHz // Radio communication technology / Omsk Research Institute of Instrument Engineering. - 2001. - Vol. 6. - - p. 27-33.

12. Zachateisky D.E., Shadrin B.G. On the accuracy of short-term forecasting of propagation conditions of KB radio waves based on the use of the IRI ionosphere model // Radio communication technology / Omsk Research Institute of Instrument Engineering. - 2006. - Vol. 11. - p. 29-39.

13. Kiselev A.M., Mahotin VV, Ryzhov N.Yu., Shatalova G.V. A method for implementing a high-speed parallel modem // Radio engineering. 2006. issue. 11. p. 5-15.

14. Ginsburg V.V., Girshov B.C., Zayezny A.M., Kagan B.D., Kustov O.V., Okunev Yu.B. and other equipment for the transmission of discrete information MS-5 / Edited by Zaezdny A.M. and Okuneva Yu.B. - M .: Communication. 1970.152 s.

15. N.A. Sartasov, V.M. Edvabny, V.V. Gribin Short-wave radio receivers. M.: Communication, 1971 - 288 p.

Claims (4)

1. Departmental system of two-way high-speed radio communication with efficient use of the radio frequency spectrum, consisting of R identical transceiver kits, each of which contains a serially connected analog signal source, encoder, first input signal switcher, signal compression device, second input signal switcher, modulator, radio transmitting device , a radio signal switch and a radio receiving device (RPU), a serially connected demodulator, a signal expansion device a, the first switch of the output signals, the decoder and receiver of the analog signal, as well as the transceiver antenna, the input-output of which is connected to the additionally connected output of the radio transmitting device, the source of a discrete signal, the output of which is connected to another input of the first switch of the input signals, the receiver of a discrete signal, input which is connected to the other output of the first output signal switch, the control input of which, which is the control input of the signal source of the transceiver kit, is it is single with the control input of the first input signal commutator, a digital selective call signal conditioner (DSC), a control unit and a clock demodulator, the input and output of which are connected respectively to the input of the demodulator and to the first input of the control unit, the second input of which is connected to the control output of the signal compression device the control input of which is combined with the control input of the radio transmitting device, with the control input of the radio signal switch, with the control input of the demodulator and with the output control bay, the third input of which is the control input of the DSC signal transmission of the transceiver set, is combined with the control input of the second input signal switch and the control input of the DSC signal generator, the output and clock input of which are connected respectively to the other input of the second input switch and the clock input signal compression devices, the fourth input of the control unit is the input of the transceiver set in standby mode "reception", and its fifth and sixth inputs are connected s respectively with the clock output of the signal expansion device and with an additionally connected output of the demodulator, the signal compression device of each transceiver set consists of a first memory block, a first write counter, a first phasing block and a first read counter, the output of which is combined with a read control input of the first memory block and with the first input of the first phasing unit, the second input of which is combined with the recording control input of the first memory unit and with the output of the first recording counter, unitary enterprise the branching input of which is connected to the first output of the first phasing unit, the second output of which is connected to the control input of the first readout counter, the clock input of which is the clock input of the signal compression device, the control input and control output of which are the control input and the control output of the first phasing unit, block the control of each transceiver set contains the first OR element, the first and second triggers, the third input signal switch, the OR-NOT element and decryption DSC signal ator whose output is combined with the first input of the first OR element and with the first input of the first trigger, the output of which is connected to the control input of the third input signal switch, the output of which is connected to the first input of the OR-NOT element, the second input of which is connected to the output of the second trigger the first input of which is connected to the output of the first OR element, the first and second inputs of the third input signal switch, the second input of the first trigger combined with the second input of the first OR element, the second input second of the trigger, the first and second inputs of the DSC signal decoder are the first, second, third, fourth, fifth and sixth inputs of the control unit, respectively, the signal expansion device of each transceiver set consists of a second memory block, a second write counter, a second phasing block, a second read counter , a clock synchronization block and a cyclic synchronization block, the input of which is combined with the input of the signal expansion device and the input of the clock synchronization block, the first and second outputs of which are respectively, with the clock input of the second readout counter and with the clock input of the cyclic synchronization unit, combined with the clock input of the second record counter and which is the clock output of the signal expansion device, the output of the second record counter is combined with the write control input of the second memory block and with the first input of the second phasing block the second input of which is combined with the control input of the reading of the second memory block and with the output of the second read counter, the control input of which is connected to the first the output of the second phasing unit, the second output of which is connected to the control input of the second recording counter, and the control input of the second phasing unit is connected to the output of the cyclic synchronization unit, characterized in that each transceiver set additionally includes a clock shaper and a device for selecting the optimal communication frequency (UHVS ), the first control input of which is the input of the choice of the optimal communication frequency of the transceiver set, and the second control input, which controls you od, control output-input, channel output and channel inputs-outputs of the UHFD are connected respectively with the first additional output of the control unit, with the first additional input of the control unit, with additional control input-output of the radio transmitting device, with an additionally connected input of the demodulator and with the corresponding channel outputs - RPU inputs, which additionally use K-1 reception channels combined by antenna inputs with RPU antenna input, To separate channel outputs-inputs of They are channel outputs and inputs of the corresponding K reception channels, and the K value determines the number of optimal operating frequencies allowed for communication to each transceiver set, the values of which, when the departmental system operates within each time interval of a specified duration, are determined by the frequency schedule compiled from the results of short-term forecasting conditions of ionospheric propagation of radio waves, the input of the pulse shaper is connected to an additional clock output of the signal expansion device, and the first, second, third and fourth outputs of the clock driver are connected respectively to the additionally connected clock input of the DSC signal driver, to the additional clock input of the signal compression device, to the external synchronization input of the digital signal source and to the external synchronization input of the encoder wherein the control input of the pulse shaper is combined with an additional control input of the signal compression device, with an additional input m signal extension unit and the second additional output of the control unit, the second and third additional inputs of which are respectively input for setting the transceiver in the set mode and a simplex radio transceiver set input for setting a mode of "reception" or "signaling. 2. Departmental system of two-way high-speed radio communication with efficient use of the radio frequency spectrum according to claim 1, characterized in that in each transceiver set, a fourth input switch, a third trigger, a second OR element, the output of which is connected to the first input of the third trigger, are additionally introduced into the control unit , and the third OR element, the output of which is connected to the second input of the third trigger, the output of which, which is the second additional output of the control unit, is connected to the control the input of the fourth switch of input signals, the first input of which is connected to the output of the OR-NOT element, and the output and second input of the fourth switch of input signals are respectively the output and the third additional input of the control unit, and the first and second inputs of the second OR element are connected respectively to the second input of the second trigger and with an additionally connected output of the DSC signal decoder, the additional input of which is the first additional input of the control unit, and the additional output of the decoder The DSC signal is combined with an additional input of the first OR element and with the first input of the third OR element, the second input of which is the second additional input of the control unit, the first additional output of which is the additionally connected output of the second trigger. 3. The departmental system of two-way high-speed radio communication with the efficient use of the radio frequency spectrum according to claim 1, characterized in that in each transceiver set, a second output signal switch and a fifth input signal switch, the output of which is the output of the signal compression device, are additionally input into the signal compression device which is the input of the second switch output signals, the first output of which is connected to the input of the first memory block, the output of which is connected to the first input m fifth switch input, a second input coupled to the second output of the second switch outputs the control input of which is combined with a fifth control input of switch input signals and an additional control input signal compression device, an additional clock input of which is the first recording clock input of the counter. 4. The departmental system of two-way high-speed radio communication with efficient use of the radio frequency spectrum according to claim 1, characterized in that in each transceiver set, a third output signal switch and a sixth input signal switch, the output of which is the output of the signal expansion device, are additionally introduced into the signal expansion device which is the input of the third switch output signals, the first output of which is connected to the input of the second memory block, the output of which is connected to the first input of the sixth switch of input signals, the second input of which is connected to the second output of the third switch of output signals, the control input of which is combined with the control input of the sixth switch of input signals, with an additional input of the clock synchronization unit and is an additional input of the signal compression device, the additional clock output of which is additional clock output of the clock synchronization block.

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