A device for assessing the timeliness of message transmission in decameter radio links in conditions of small-scale ionospheric formations

Abstract

The utility model relates to the field of decameter (DCM) radio communication and can be used to assess the timeliness of message transmission in conditions of small-scale ionospheric formations. The technical result of the utility model is the possibility of determining the timeliness of message transmission in decameter radio links during ionospheric disturbances, taking into account the occurrence of frequency-selective fading and intersymbol interference. The device for assessing the timeliness of message transmission in conditions of small-scale ionospheric formations additionally includes a sequentially connected unit for determining the diffraction parameter (17), a unit for determining the coherence bandwidth of the DCM radio channel (18), a unit for determining energy losses due to frequency-selective fading and intersymbol interference (19), and a unit for assessing the probability of timely message transmission (23). 2 fig.

Description

[0001] Field of technology to which the utility model belongs

[0002] The utility model relates to the field of decameter (DCM) radio communication and can be used to assess the timeliness of message transmission in conditions of small-scale ionospheric formations.

[0003] Technology Level

[0004] Analysis of the propagation conditions of decameter-range radio waves in the ionosphere shows that the reliability and timeliness of message transmission significantly depend on the state of the ionized environment, particularly on the occurrence of ionospheric formations [1-3]. Under conditions of pronounced diffuseness, the signal is a superposition of multiple components with similar amplitudes and phases, making the channel particularly sensitive to rapid fading. Consequently, the probability of timely message transmission in a decameter-range radio link is closely related to the current level of ionospheric diffuseness, since it determines the degree of temporal signal smearing and the depth of fading [4].Thus, forecasting and assessing the probability of timely transmission in DCM radio channels requires a detailed consideration of the dynamics of small-scale ionospheric irregularities and their influence on the temporal structure of the signal, since it is these parameters that determine the channel's maximum capabilities to ensure a given delay in message delivery, i.e., ensuring the timeliness of message transmission.

[0005] An analogue of the proposed device is a device for determining the noise immunity of digital signal reception in a DCM communication channel under conditions of ionospheric diffusion [5].

[0006] The device comprises: a receiving antenna 1, the output of which is connected to the first input of a dual-frequency receiver 2; a dual-frequency receiver 2, the output of which is connected to the first input of an analog-to-digital primary processing processor 4; a reference generator and frequency synthesizer 3, the first output of which is connected to the second input of the dual-frequency receiver 2, and the second output is connected to the second input of an analog-to-digital primary processing processor 4 and the second input of the total electron content of the ionosphere calculating unit 6; an analog-to-digital primary processing processor 4, the output of which is connected to the signal phase path calculating unit 5; a signal phase path calculating unit 5, the output of which is connected to the first input of the total electron content of the ionosphere calculating unit 6;a unit for calculating the total electron content of the ionosphere 6, the output of which is connected to a unit for calculating the standard deviation of small-scale fluctuations of the total electron content of the ionosphere 7 and a unit for calculating the average value of the total electron content of the ionosphere 8; a unit for calculating the standard deviation of small-scale fluctuations of the total electron content of the ionosphere 7, the output of which is connected to a first input of a unit for calculating the intensity of small-scale irregularities of the electron concentration of the ionosphere 9; a unit for calculating the average value of the total electron content of the ionosphere 8, the output of which is connected to a second input of a unit for calculating the intensity of small-scale irregularities of the electron concentration of the ionosphere 9;a unit for calculating the intensity of small-scale inhomogeneities of the electron concentration of the ionosphere 9, the output of which is connected to a unit for determining the root-mean-square deviation of the fluctuations of the phase front of the wave at the output of the inhomogeneous ionosphere 13; an information output device 10; a unit for determining the root-mean-square deviation of the fluctuations of the phase front of the wave at the output of the inhomogeneous ionosphere 13, the output of which is connected to a unit for determining the Rice parameter 14; a unit for determining the Rice parameter 14, the output of which is connected to the first input of a unit for determining the probability of error 15; a unit for determining the probability of error 15, the output of which is connected to an input of the information output device 10; a unit for determining the parameters of the DCM of the radio path 11, the output of which is connected to the unit for determining the root-mean-square deviation of the fluctuations of the phase front of the wave at the output of the inhomogeneous ionosphere 13;a block for determining the multiplicity and type of modulation 12, the output of which is connected to the second input of the block for determining the probability of error 15; a block for determining the signal / noise ratio at the receiving point 16, the output of which is connected to the third input of the block for determining the probability of error 15.

[0007] The disadvantage of this device is its limited functionality: the influence of frequency-selective fading and intersymbol interference is not taken into account to determine the timeliness of message transmission in the DCM range during single reception in conditions of ionospheric diffusion.

[0008] The prototype of the claimed utility model is a device for assessing the reliability of communication when processing digital signals in a decameter communication channel under conditions of ionospheric diffusion [6], shown in Fig. 1.

[0009] This device comprises a receiving antenna 1, the output of which is connected to the first input of a dual-frequency receiver 2; a dual-frequency receiver 2, the output of which is connected to the first input of an analog-to-digital primary processing processor 4; a reference oscillator and frequency synthesizer 3, the first output of which is connected to the second input of the dual-frequency receiver 2, and the second output is connected to the second input of the analog-to-digital primary processing processor 4 and the second input of the total electron content of the ionosphere calculating unit 6; an analog-to-digital primary processing processor 4, the output of which is connected to the signal phase path calculating unit 5; a signal phase path calculating unit 5, the output of which is connected to the first input of the total electron content of the ionosphere calculating unit 6;the output of which is connected to the input of the unit for calculating the root mean square deviation of small-scale fluctuations of the total electron content of the ionosphere 7 and the input of the unit for calculating the average value of the total electron content of the ionosphere 8; the unit for calculating the root mean square deviation of small-scale fluctuations of the total electron content of the ionosphere 7, the output of which is connected to the first input of the unit for calculating the intensity of small-scale inhomogeneities of the electron concentration of the ionosphere 9; the unit for calculating the average value of the total electron content of the ionosphere 8, the output of which is connected to the second input of the unit for calculating the intensity of small-scale inhomogeneities of the electron concentration of the ionosphere 9; the unit for calculating the intensity of small-scale inhomogeneities of the electron concentration of the ionosphere 9, the output of which is connected to the first input of the unit for determining the root mean square deviation of the fluctuations of the phase front of the wave at the output of the inhomogeneous ionosphere 13;an information output device 10; a unit for determining the parameters of the radio path DCM 11, the output of which is connected to the second input of the unit for determining the root-mean-square deviation of the phase front fluctuations of the wave at the output of the inhomogeneous ionosphere 13; a unit for determining the multiplicity and type of modulation 12, the first output of which is connected to the second input of the unit for determining the error probability 15, and the second output to the second input of the unit for determining the error probability in diversity reception 17; a unit for determining the root-mean-square deviation of the phase front fluctuations of the wave at the output of the inhomogeneous ionosphere 13, the output of which is connected to the unit for determining the Rice parameter 14; a unit for determining the Rice parameter 14, the first output of which is connected to the first input of the unit for determining the error probability 15, and the second output to the first input of the unit for determining the error probability in diversity reception 17;an error probability determination unit 15, the output of which is connected to the first input of an acceptable signal-to-noise ratio estimator unit 18; a signal-to-noise ratio determination unit at the receiving point 16, the first output of which is connected to the third input of the error probability determination unit 15, the second output is connected to the third input of the diversity reception error probability determination unit 17; a diversity reception error probability determination unit 17, the output of which is connected to the second input of an acceptable signal-to-noise ratio estimator unit 18; an acceptable signal-to-noise ratio estimator unit 18, the output of which is connected to the first input of a communication reliability estimator unit 21; a unit for determining initial data for estimating the average signal-to-noise ratio 19, the output of which is connected to the input of an average signal-to-noise ratio estimator unit 20; an average signal-to-noise ratio estimator unit 20, the output of which is connected to the second input of a communication reliability estimator unit 21;a communication reliability evaluation unit 21, the output of which is connected to the information output device 10.;

[0010] The disadvantage of this device is its limited functionality, since it only allows calculating the reliability of communication in the DCM range, when transmitting signals with multiple (multi-position) modulation, and does not evaluate the timeliness of message transmission under conditions of frequency-selective fading and intersymbol interference.

[0011] Disclosure of the essence of the utility model

[0012] The technical result of the utility model is the development of a device for determining the timeliness of message transmission in decameter radio lines during ionospheric disturbances, taking into account the occurrence of frequency-selective fading and intersymbol interference.

[0013] The technical result of the claimed utility model is achieved by introducing new (in relation to the prototype) functional elements, namely: a block for estimating the probability of timely transmission of messages, a block for determining the coherence band of the DCM radio channel, a block for determining the diffraction parameter, a block for determining energy losses due to frequency-selective fading and intersymbol interference.

[0014] The device for determining the timeliness of message transmission in decameter radio links under small-scale ionospheric formations does not include a unit for determining the modulation ratio and type, or a unit for determining the error probability during diversity reception. Therefore, the determination of the timeliness of message transmission in decameter radio links under small-scale ionospheric formations is performed under ionospheric disturbances, taking into account the occurrence of frequency-selective fading and intersymbol interference.

[0015] Brief description of drawings

[0016] Fig. 1 shows a diagram of a device for determining the reliability of communication when processing digital signals in a DCM communication channel under conditions of ionospheric diffusion according to the prototype.

[0017] Fig. 2 shows a device for determining the timeliness of message transmission in decameter radio lines under conditions of small-scale ionospheric formations.

[0018] The device comprises a receiving antenna 1, the output of which is connected to the first input of a dual-frequency receiver 2; a dual-frequency receiver 2, the output of which is connected to the first input of an analog-to-digital primary processing processor 4; a reference oscillator and frequency synthesizer 3, the first output of which is connected to the second input of the dual-frequency receiver 2, and the second output is connected to the second input of an analog-to-digital primary processing processor 4 and the second input of an ionospheric total electron content calculating unit 6; an analog-to-digital primary processing processor 4, the output of which is connected to a signal phase path calculating unit 5; a signal phase path calculating unit 5, the output of which is connected to the first input of an ionospheric total electron content calculating unit 6;a unit for calculating the total electron content of the ionosphere 6, the first output of which is connected to a unit for calculating the average value of the total electron content of the ionosphere 7, a second output - to a unit for calculating the standard deviation of small-scale fluctuations of the total electron content of the ionosphere 8; a unit for calculating the average value of the total electron content of the ionosphere 7, the output of which is connected to the first input of a unit for calculating the intensity of small-scale inhomogeneities of the electron concentration of the ionosphere 9; a unit for calculating the standard deviation of small-scale fluctuations of the total electron content of the ionosphere 8, the output of which is connected to the second input of the unit for calculating the intensity of small-scale inhomogeneities of the electron concentration of the ionosphere 9;a unit for calculating the intensity of small-scale inhomogeneities of the electron concentration of the ionosphere 9, the output of which is connected to the first input of the unit for determining the standard deviation of the phase front fluctuations of the wave at the output of the inhomogeneous reflecting layer of the ionosphere 11; an information output device 10; a unit for determining the parameters of the DCM radio path 16, the first output of which is connected to the second input of the unit for determining the standard deviation of the phase front fluctuations of the wave at the output of the inhomogeneous ionosphere 11, the second output - to the unit for determining the diffraction parameter 17, and the third output - to the third input of the unit for determining the coherence band of the DCM radio channel 18, with the second input of the unit for determining energy losses due to frequency-selective fading and intersymbol interference 19, with the second input of the unit for estimating the probability of timely transmission of messages 23;a unit for determining the root-mean-square deviation of the phase front fluctuations of the wave at the output of the inhomogeneous reflecting layer of the ionosphere 11, the first output of which is connected to a unit for determining the Rice parameter 12, the second output - to the second input of the unit for determining the coherence bandwidth of the DCM radio channel 18; a unit for determining the Rice parameter 12, the output of which is connected to the first input of the unit for determining the probability of error 14; a unit for determining the signal-to-noise ratio at the reception point 13, the output of which is connected to the second input of the unit for determining the probability of error 14; a unit for determining the probability of error 14, the output of which is connected to the first input of the unit for estimating the permissible signal-to-noise ratio 15; a unit for estimating the permissible signal-to-noise ratio 15, the output of which is connected to the first input of the unit for estimating the reliability of communication 22; a unit for determining the diffraction parameter 17, the output of which is connected to the first input of the unit for determining the coherence bandwidth of the DCM radio channel 18;a unit for determining the coherence bandwidth of the DCM radio channel 18, the output of which is connected to the second input of the unit for determining energy losses due to frequency-selective fading and intersymbol interference 19; a unit for determining energy losses due to frequency-selective fading and intersymbol interference 19, the output of which is connected to the second input of the unit for estimating the permissible signal-to-noise ratio 15; a unit for determining the initial data for estimating the average signal-to-noise ratio 20, the output of which is connected to the input of the unit for estimating the average signal-to-noise ratio 21; a unit for estimating the average signal-to-noise ratio 21, the output of which is connected to the second input of the unit for estimating the reliability of communication 22; a unit for estimating the reliability of communication 22, the output of which is connected to the first input of the unit for estimating the probability of timely transmission of messages 23; a unit for estimating the probability of timely transmission of messages 23, the output of which is connected to the information output device 10.

[0019] Implementation of a utility model

[0020] The proposed device operates as follows. Receiving antenna 1 receives radio waves emitted by navigation satellites. From the output of receiving antenna 1, the radio signal u вх (t) is fed to the first input of the dual-frequency receiver 2, designed to amplify and select the received signals. From the output of the dual-frequency receiver 2, the vector of digital signal evaluation y(t) is fed to the first input of the primary processing analog-to-digital processor 4. j), consisting of signals from j=1…n visible navigation satellites. The reference generator and frequency synthesizer 3 generates the nominal carrier frequencies f1 and f2 fed to the second input of the dual-frequency receiver 2 [7], the second input of the primary processing analog-to-digital processor 4 and the second input of the ionospheric total electron content computing unit 6. The primary processing analog-to-digital processor 4 implements circuits for searching and tracking signal parameters. From the output of the primary processing analog-to-digital processor 4, estimates of the phase time of signal propagation at frequencies are fed to the input of the signal phase path computing unit 5 for calculating the pseudo-ranges to the navigation satellite, measured by phase R ф1 and R ф2 . From the output of the signal phase path calculation unit 5, the values ​​of R ф1 and R ф2 are fed to the first input of the block for calculating the total electron content of the ionosphere N T 6 according to the formula:

[0021] (1)

[0022] Further from the first output of the total electron content calculation unit of the ionosphere 6 values ​​of N Т are fed to the input of the block for calculating the average value of the total electron content of the ionosphere 7, from the second output to the input of the block for calculating the standard deviation of small-scale fluctuations of the total electron content of the ionosphere 8, where according to the formula:

[0023] (2)

[0024] centering, squaring, averaging and square root extraction operations are performed [8, 9]. From the output of the ionospheric total electron content average value calculation block 7, the ionospheric total electron content average value is <N T> is fed to the first input of the block for calculating the intensity of small-scale irregularities of the ionospheric electron concentration 9. From the output of the block for calculating the root-mean-square deviation of small-scale fluctuations of the total electron content of the ionosphere 8, the value of the root-mean-square deviation of small-scale fluctuations of the total electron content of the ionosphere is fed to the second input of the block for calculating the intensity of small-scale irregularities of the ionospheric electron concentration 9. In the block for calculating the intensity of small-scale irregularities of the ionospheric electron concentration 9, the value of the intensity of small-scale irregularities of the ionospheric electron concentration β is calculated и according to expression [1]:

[0025] (3)

[0026] where z э = (m) is the equivalent thickness of the ionosphere, l s= 400 (m) is the characteristic size of small-scale irregularities. The intensity value of small-scale irregularities in the electron concentration of the ionosphere β и comes from the output of the block for calculating the intensity of small-scale inhomogeneities of the electron concentration of the ionosphere 9 to the first input of the block for determining the standard deviation of the fluctuations of the phase front of the wave at the output of the inhomogeneous reflecting layer of the ionosphere 11.

[0027] In the block for determining the parameters of the DCM radio path 16, the values ​​of the operating frequency - f0, the angle of incidence of the wave on the lower boundary h0 of the reflecting layer F of the ionosphere - ϕ0, the equivalent homogeneous path of the DCM wave in the F layer of the ionosphere - L are determined э , the propagation paths of the DCM wave in free space L св , operational information transfer rate c э , associated with the technical speed c т =1 / T с signal transmission through the operational coefficient k э (c э= k э cт ), the standardized message volume-V, the permissible value of the transmission time via the RK, determined depending on the priority of the message and its volume-T пер.доп Methods for determining φ0i are presented in

[10] . The obtained values ​​of f0, φ0, L э , from the output of the block for determining the parameters of the radio path 16 are fed to the second input of the block for determining the standard deviation of the phase front fluctuations of the wave at the output of the inhomogeneous reflecting layer of the ionosphere 11.

[0028] In the block for determining the root-mean-square deviation of the phase-front fluctuations of the wave at the output of the inhomogeneous reflecting layer of the ionosphere 11, the root-mean-square deviation of the phase-front fluctuations of the wave at the output of the inhomogeneous reflecting layer of the ionosphere is calculated according to expression

[10] :

[0029] ,(4)

[0030] where - the speed of light.

[0031] Received value from the output of the unit for determining the standard deviation of the phase front fluctuations of the wave at the output of the inhomogeneous reflecting layer of the ionosphere 11, it is fed to the input of the unit for determining the Rice parameter 12, in which the parameter γ is determined 2 Rician fading of the received signal according to the expression

[10] :

[0032] .(5)

[0033] The information about the γ parameter obtained in the Rice parameter determination block 12 2 is fed to the first input of the error probability determination block 14.

[0034] In the signal-to-noise ratio determination block at receiving point 13, the obtained values ​​h 2 are fed to the second input of the error probability determination block 14.

[0035] Determination of the probability of erroneous reception P ош the signal element for the DCM radio channel in the case of incoherent reception of frequency telegraphy with fast Rayleigh-type fading is carried out in the error probability determination block 14 in accordance with the expression [11, 12]:

[0036] (6)

[0037] The error probability value P calculated in the error probability determination block 14 ош using expression (6) it is fed to the first input of the block for estimating the permissible signal-to-noise ratio 15.

[0038] Obtained values ​​f0, L э , L св from the output of the block for determining the parameters of the radio path 16, they are fed to the input of the block for determining the diffraction parameter 17. The increase in diffraction effects in the wave front as it moves away from the reflective layer to the receiving point (diffraction parameter) is calculated in the block for determining the diffraction parameter 17 according to the expression

[13]

[0039] , (7)

[0040] where L=L э + L св - the sum of the equivalent homogeneous path of the DCM wave in the F layer of the ionosphere L э and the propagation path of the DCM wave in free space L св. , i.e. from the point of exit from the reflective layer to the point of reception.

[0041] From the output of the diffraction parameter determination unit 17, the diffraction parameter value is sent to the first input of the coherence band determination unit of the radio channel 18. Taking into account the received values from the unit for determining the root-mean-square deviation of the phase front fluctuations of the wave at the output of the inhomogeneous ionosphere 11 and the operating frequency f0 from the unit for determining the parameters of the DCM radio path 16 the frequency coherence band of the DCM radio channel F к under conditions of ionospheric disturbances it is calculated in accordance with the expression [14, 15]:

[0042] .(8)

[0043] Obtained F values к in the block for determining the coherence bandwidth of the radio channel 18, the data are fed to the first input of the block for determining energy losses due to frequency-selective fading and intersymbol interference 19 to calculate the energy loss coefficients during incoherent signal processing due to frequency-selective fading and intersymbol interference .

[0044] ,(9)

[0045] ,(10)

[0046] where erf(x) is the probability integral, with т - technical signal transmission speed (baud), received from the second input from the third output of the block for determining the parameters of the DCM radio path 16.

[0047] Energy loss coefficients And , obtained in accordance with expressions (9) and (10), respectively, from the block for determining energy losses due to frequency-selective fading and intersymbol interference 19 are fed to the second input of the block for estimating the permissible signal-to-noise ratio 15.

[0048] In the block for assessing the permissible signal-to-noise ratio, parameter 15 is estimated as the acceptable signal-to-noise ratio to ensure an acceptable error probability P ош ≤P ош.доп =10 -5 based on the results of the error probability assessment P ошin the block for determining the probability of error 14, and the values ​​of the coefficients And from the block for determining energy losses due to frequency-selective fading and intersymbol interference 19. Acceptable signal-to-noise ratio Z доп at the receiver input in accordance with [16, 17] is determined by the expression:

[0049] .(11)

[0050] In the block for determining the initial data for estimating the average signal-to-noise ratio 20, the following values ​​are determined: f F2 - critical frequency of the F2 layer of the ionosphere with maximum electron concentration, h m -height of maximum electron concentration, f E - critical frequency of the E layer of the ionosphere, x j - zenith angle of the sun at the point of reflection, M(3000)F2 - scale factor, f H - gyrofrequency at the reflection point, d is the communication range, F инд - level of industrial interference, ρ прм - receiver coordinates, ρ отр - coordinates of the wave reflection point, t дт- date of organization of radio communication, t отр - time of day, which are received at the input of the average signal-to-noise ratio evaluation unit 21. Ionospheric parameters (f F2 , f E , f H , h m , M(3000)F2) for a given wave reflection point can be obtained using the IRI-2016 reference model

[18] .

[0051] In the average signal-to-noise ratio estimation unit 21, based on the initial data received from the initial data determination unit for estimating the average signal-to-noise ratio 20, the average signal-to-noise ratio is estimated in accordance with known methods [19, 20].

[0052] After the values And calculated, they are sent to the first and second inputs (respectively) of the communication reliability assessment unit 22 to calculate the parameter D св .

[0053] Parameter D св is determined by the formula:

[0054] .(12)

[0055] Here -Laplace function; ; - standard deviation of the signal-to-noise ratio during slow fading of signals and interference.

[0056] The standard deviation of the signal-to-noise ratio for slow fading of signals and interference included in expression (12) does not depend on the choice of operating frequency (i.e. ) and on average per month is dB

[21] .

[0057] Calculated value of communication reliability D св in the communication reliability evaluation block 22, it is fed to the first input of the block for evaluating the probability of timely transmission of messages 23, to the second input of which the values ​​of the operational speed of information transmission are fed э , the permissible time for transmitting messages via radio channel T пер.доп , determined depending on the priority of the message and its volume (min), and the standardized volume of the message V, to determine the probability of timely transmission of messages P спс in accordance with the expression

[16]

[0058] .(13)

[0059] Calculated P value спс in the block for assessing the probability of timely transmission of messages 23, the input of the information output device 10 is received.

[0060] Thus, the developed device (Fig. 2) allows, based on measuring the intensity of small-scale inhomogeneities of the electron concentration of the ionosphere (β и ), determining the parameters of the DCM radio path (f0, ϕ0, L э , L св , c э , V, T пер.доп ), energy losses due to frequency-selective fading ( ) and intersymbol interference ( ), as well as determining the frequency coherence band of the DCM radio channel (F к ) to determine the timeliness of message transmission P спс in decameter radio lines during ionospheric disturbances, taking into account the occurrence of frequency-selective fading and intersymbol interference.

[0061] The study was supported by the Russian Science Foundation grant No. 24-21-00295 (https: / / rscf.ru / project / 24-21-00295 / ).

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Claims

A device for assessing the timeliness of message transmission in conditions of small-scale ionospheric formations, including a receiving antenna, the output of which is connected to the first input of a dual-frequency receiver, a dual-frequency receiver, the output of which is connected to the first input of an analog-to-digital primary processing processor, a reference generator and frequency synthesizer, the first output of which is connected to the second input of the dual-frequency receiver, the second output - to the second input of the analog-to-digital primary processing processor and the second input of the unit for calculating the total electron content of the ionosphere, an analog-to-digital primary processing processor, the output of which is connected to the unit for calculating the phase path of the signal, the unit for calculating the phase path of the signal, the output of which is connected to the first input of the unit for calculating the total electron content of the ionosphere, the unit for calculating the total electron content of the ionosphere,the first output of which is connected to the input of the unit for calculating the average value of the total electron content of the ionosphere, the second output - to the unit for calculating the root-mean-square deviation of small-scale fluctuations of the total electron content of the ionosphere, the outputs of which are connected respectively to the first and second inputs of the unit for calculating the intensity of small-scale inhomogeneities of the electron concentration of the ionosphere, the unit for calculating the intensity of small-scale inhomogeneities of the electron concentration of the ionosphere, the output of which is connected to the first input of the unit for determining the root-mean-square deviation of the fluctuations of the phase front of the wave at the output of the inhomogeneous reflecting layer of the ionosphere, the unit for determining the parameters of the decameter (DCM) radio path, the first output of which is connected to the second input of the unit for determining the root-mean-square deviation of the fluctuations of the phase front of the wave at the output of the inhomogeneous reflecting layer of the ionosphere,a unit for determining the root-mean-square deviation of the phase front fluctuations of the wave at the output of the inhomogeneous reflecting layer of the ionosphere, the first output of which is connected to the input of the unit for determining the Rice parameter, a unit for determining the Rice parameter, the output of which is connected to the first input of the unit for determining the probability of error, a unit for determining the signal-to-noise ratio at the reception point, the output of which is connected to the second input of the unit for determining the probability of error, a unit for determining the probability of error, the output of which is connected to the first input of the unit for estimating the permissible signal-to-noise ratio, a unit for determining the initial data for estimating the average signal-to-noise ratio, the output of which is connected to the input of the unit for estimating the average signal-to-noise ratio, a unit for estimating the average signal-to-noise ratio, the output of which is connected to the second input of the unit for estimating the reliability of communication, a unit for estimating the permissible signal-to-noise ratio, the output of which is connected to the first input of the unit for estimating the reliability of communication, an information output device,characterized in that it further comprises a unit for determining the diffraction parameter, a unit for determining the coherence bandwidth of the DCM radio channel, a unit for determining energy losses due to frequency-selective fading and intersymbol interference, and a unit for estimating the probability of timely transmission of messages, wherein the second output of the unit for determining the standard deviation of the phase front fluctuations of the wave at the output of the inhomogeneous reflecting layer of the ionosphere is connected to the second input of the unit for determining the coherence bandwidth of the DCM radio channel, the second output of the unit for determining the parameters of the DCM radio path is connected to the input of the unit for determining the diffraction parameter, the third output of the unit for determining the parameters of the DCM radio path is connected to the third input of the unit for determining the coherence bandwidth of the DCM radio channel,with the second input of the unit for determining energy losses due to frequency-selective fading and intersymbol interference and with the second input of the unit for estimating the probability of timely transmission of messages, the output of the unit for determining the diffraction parameter is connected to the first input of the unit for determining the coherence bandwidth of the DCM radio channel, the output of the unit for determining the coherence bandwidth of the DCM radio channel is connected to the second input of the unit for determining energy losses due to frequency-selective fading and intersymbol interference, the output of the unit for determining energy losses due to frequency-selective fading and intersymbol interference is connected to the second input of the unit for estimating the permissible signal-to-noise ratio, the output of the unit for estimating the reliability of communication is connected to the first input of the unit for estimating the probability of timely transmission of messages, and the output of the unit for estimating the probability of timely transmission of messages is connected to the information output device.

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