RU2390096C2 - Method for assignment of frequencies to radio-electronic facilities - Google Patents

Abstract

FIELD: radio engineering.

SUBSTANCE: invention relates to methods for provision of electromagnet compatibility (EMC) of radio-electronic facilities (REF) of communication system with other REF that operate in matching range of working frequencies at the territory serviced by communication system. In method for each transmitter of communication system a set of frequency channels is identified, every of which satisfies conditions of intersystem EMC provision, selected frequency channels are assigned so that minimum of noise capacities sum, which is generated by transmitters of communication system at inlets of other REF receivers and at inlets of communication system receivers, is maintained.

EFFECT: reduced noise effect of communication system transmitters at receivers of other radio-electronic facilities, provision of electromagnetic compatibility of communication system and other radio-electronic facilities, and improved conditions of electromagnetic compatibility inside communication system.

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Description

The invention relates to radio communication systems, and more specifically to methods for ensuring electromagnetic compatibility (EMC) of electronic equipment (RES) communication systems with other RES operating in the same operating frequency range in the territory served by the communication system. In this case, other RES have priority (work on a primary basis) relative to a communication system that works on a secondary basis. RES of a communication system can be the source of unintentional radio interference (URF) for other RES. One of the effective ways of providing EMC in these conditions is the optimal (quasi-optimal) assignment of operating frequencies (frequency channels) to the transmitters of the communication system.

The invention can be applied in the development of the frequency-territorial plan in order to increase the efficiency of using the frequency resource, reduce the influence of the interference effect of the communication system RES on another purpose RES, improve the EMC conditions inside the communication system.

Known methods for assigning operating frequencies to a group of RES.

1. Soloviev V.V., Yanshin S.N. Dynamic assignment of frequencies to GSM standard cellular networks // Radio Engineering, 2001, No. 6. - p. 101-104.

2. Sorokin S.A., Yanshin S.N. Optimization of frequency assignments to networks of radio relay stations // Radio Engineering, 2005, No. 9. - p. 110-112.

The essence of these methods of frequency assignment is to perform the following sequence of actions:

- a functionally weighted multigraph is generated that displays the conditions of a duel (pairwise) mutual influence of the analyzed RES, which is the initial one for solving the frequency assignment problem;

- the problem of numerically marking the vertices of the obtained functionally weighted oriented multigraph is solved. As a result of solving this problem, the necessary frequency plan is formed. To solve this problem, the local optimization method is used, according to which the numerical marking of the vertices of the multigraph is carried out sequentially (in steps) and at each step the decision to assign the frequency to the next RES is made based on the objective function - the minimum of the assigned frequency channel numbers. The sequence of unmarked vertices of a multigraph is ordered in accordance with a decrease in the number of frequency constraints for each RES, and if they are equal, in decreasing degree of a vertex. At each step, on the basis of the relations defining the interference-hazardous channel numbers, a set of such accessible numbers of frequency channels is formed, on which there is no mutual influence of the RES that have already received frequency assignments. In this set, a subset of previously assigned channel numbers is highlighted and the minimum one is selected from them. If this subset is empty, then for the considered vertex from the set of available channel numbers on which there is no mutual influence of the RES, the minimum free frequency channel number is selected. If this set is also empty, then it is fixed that the given vertex of the multigraph cannot be marked (the frequency assignment to the corresponding RES cannot be made).

The above methods of frequency assignment are not perfect enough, because focused on EMC calculations in a duel situation, in which two RES are considered: RES, which is the source of interference, and RES, which is the receptor of interference. In the case of a sufficiently close arrangement of the interacting RESs to each other, when the levels of the RRP created by each transmitter on the affected receivers are comparable, taking into account only the duel mutual interference of the interacting RESs can lead to the fact that the sum of the interference powers from the group of transmitters is several times higher than the interference power, created by one transmitter. In this case, the frequency plan calculated only taking into account the duel interference will not ensure the fulfillment of the EMC conditions in the RES group.

The closest method adopted for the prototype is the "method for providing electromagnetic compatibility of a communication system" (Invention "A method for providing electromagnetic compatibility of a communication system", patent RU 2271067 C1, H04B 7/185, H04B 7/26, publ. 02.27.2006). RES of the communication system described in the prototype method, work with other RES in the same operating frequency range. The prototype method consists in the fact that out of the entire set of transmitters of the communication system, a group of specific transmitters is identified that can operate simultaneously on a given frequency channel from the operating frequency range with the given parameters of the emitted radio signals providing radio coverage of the served territory, without having an unacceptable effect on the receivers of other electronic means, such identification is made for each frequency channel from the range of working radio frequencies and is obtained for each transmitter, a set of frequency channels from this range, each of which individually can be used on this transmitter to operate a communication system with inter-system electromagnetic compatibility, and when the communication system is in operation, each transmitter is switched on on a frequency channel selected from the set of frequency channels obtained for it at subject to intrasystem electromagnetic compatibility.

The disadvantages of this method of assigning frequency channels is the insufficiently efficient use of the available frequency resource due to the fact that the order of rational selection of the frequency channel for each transmitter from the set of frequency channels received for it is not defined and recommendations for observing the intrasystem EMC are not proposed.

Also, in the prototype method, only transmitters of a communication system are considered as sources of interference to other RESs. However, other RES may be affected by atmospheric interference, industrial interference, and other interference not related to the functioning of the communication system. In these conditions, it is necessary not only to determine the set of frequency channels for each transmitter of the communication system, each of which can be used on this transmitter to operate the communication system with inter-system EMC, but also to designate the selected frequency channels in such a way as to ensure a minimum of the sum of the interference powers, created by transmitters communication systems at the inputs of receivers of other RES. In this case, the most acceptable conditions for the operation of receivers of other RESs will be provided, taking into account all other interference (atmospheric, industrial, etc.) that are independent of the communication system (Petrovsky V.I., Sedelnikov Yu.E. Electromagnetic compatibility of radioelectronic means: Textbook. manual for universities. - M.: Radio and communications, 1986. - 216 p.: ill.). For the same purpose, it is supposed to minimize the interference power at the inputs of the receivers of the communication system.

The invention is aimed at reducing the interference effect of transmitters of a communication system on the receivers of other RES, providing an EMC communication system and other RES, as well as improving the conditions of the EMC inside the communication system.

The technical result is to expand the capabilities of the prototype method by improving the EMC conditions within the communication system and with other RES.

The technical result is achieved by reducing the power of the URP created by the transmitters of the communication system at the inputs of receivers of other RES and receivers of the communication system, compared with the prototype method.

A distinctive feature of the claimed invention from the prototype is that it allows you to select such frequency channels for transmitters of the communication system in order to minimize the total level of interference at the inputs of receivers of other RES and at the inputs of receivers of the communication system and thereby improve the conditions of intersystem and intrasystem EMC.

A method is proposed that contains the essential features of a prototype: from the entire set of transmitters of a communication system, a group of specific transmitters is identified that can operate simultaneously on a given frequency channel from a range of operating frequencies with specified parameters of emitted radio signals that provide radio coverage of the served area without exerting an unacceptable effect on receivers of other electronic means, such identification is performed for each frequency channel from the range of working radio frequencies t and receive for each transmitter a set of frequency channels from this range, each of which individually can be used on this transmitter to operate the communication system with inter-system electromagnetic compatibility, and when the communication system is in operation, each transmitter is switched on on the frequency channel selected from a set of frequency channels, subject to intrasystem electromagnetic compatibility.

Other significant distinguishing features from the prototype are the following: after determining for each transmitter of the communication system a set of frequency channels, each frequency channel from these sets at the same time satisfies the conditions for ensuring intersystem electromagnetic compatibility, to reduce the power of unintentional interference at the inputs of receivers of other electronic devices and to improve the intra-system electromagnetic channels assign to each transmitter of the communication system frequency channels from received sets of frequency channels in such a way as to ensure a minimum amount of interference power generated by transmitters of the communication system at the inputs of receivers of other electronic devices and at the inputs of receivers of the communication system, then simultaneously turn on the transmitters of the communication system on the frequency channels obtained for them as a result of this purpose, after which measures the interference power at the inputs of the receivers of the communication system and the inputs of the receivers of other electronic equipment, compares the measured values of the interference power with their allowable values and if the conditions of electromagnetic compatibility are not satisfied for at least one receiver, the transmitter power of the communication system is reduced, which has the most undesirable effect on the receivers of other electronic devices and the receivers of the communication system, or, if it is impossible to reduce the power of this transmitter, reconfigure the structure of the communication system , then again assign frequency channels to the transmitters of the communication system in such a way as to ensure a minimum amount of power interference caused by transmitters of the communication system at the inputs of the receivers of other electronic means and at the inputs of the receivers of the communication system, simultaneously include the transmitters of the communication system on the frequency channels obtained for them as a result of a new purpose, measure the power of the interference at the inputs of the receivers of the communication system and the inputs of the receivers of other electronic means , compare the measured values of the interference power with their acceptable values and in case of failure of the conditions of electromagnetic compatibility for at least one receiver and they reduce the power of the transmitter of the communication system, which has the most severe undesirable effect on the receivers of other electronic devices and receivers of the communication system, or, if it is impossible to reduce the power of this transmitter, reconfigure the structure of the communication system and so on until the conditions of electromagnetic compatibility are met for all receivers of the communication system, and all receivers of other electronic means, either the possibilities to reduce the transmit power will be exhausted of communication system or reconfiguration of its structure.

The proposed method due to the inclusion of each transmitter on a frequency channel assigned in this way provides inter-system and intra-system EMC and allows you to build close to the optimal frequency-territorial plan of the communication system.

The invention is described in more detail below.

Currently, RES are used, as a rule, in a complex electromagnetic environment. In this case, a significant contribution to the destructive effect on the RES is made by SLFs, which reduce the signal / (noise + noise) ratio and thereby degrade the quality of communication. In these conditions, it is necessary to solve the problem of providing EMC for functioning RES. One of the main directions of providing EMC RES is their frequency planning (Buzov A.L., Bykhovskiy M.A. et al. Radio-frequency spectrum management and electromagnetic compatibility of radio systems. Textbook / Ed. By Doctor of Technical Sciences, prof. M.A. Bykhovskogo. - M .: Eco-Trends, 2006 .-- 376 p.).

At the same time, part of the RES uses the frequency resource on a primary basis, for example, RES that ensures aviation safety, some RES of law enforcement agencies, RES that ensure the functioning of important state facilities, and others, and part of the RES on a secondary basis, such as cellular and trunked radio networks, commercial television and radio broadcasting networks and others (Buzov A.L., Bykhovsky M.A. et al. Radio-frequency spectrum management and electromagnetic compatibility of radio systems. Textbook / Ed. by Doctor of Engineering, Professor M.A. Bykhovsky. - M.: Eco- Trends, 2006 .-- 376 p.).

Moreover, in one area, RES can operate simultaneously, which use a frequency resource on a primary and secondary basis. If these RES operate in the same frequency ranges, it is necessary to take measures aimed at limiting the undesirable effects of RES using a frequency resource on a secondary basis on RES using a frequency resource on a primary basis. Further in the text, we will assume that the RES using the frequency resource on a secondary basis form a communication system, and the RES using the frequency resource on a primary basis will be called other RES.

One of the most widely used methods for coordinating the conditions of joint work of RESs under the influence of mutual interference is the development and implementation of frequency-territorial separation (BST) standards between RESs (Knyazev A.D. Elements of the theory and practice of ensuring electromagnetic compatibility of radio electronic equipment. - M .: Radio and communications, 1984. - 336 p.). By the norms of the BHF RES are understood the interdependent requirements for frequency detuning and mutual removal of the RES, the implementation of which ensures their joint operation with the specified (required) values of the quality indicators.

The quality indicators of radio electronic equipment under the conditions of the NRP, significantly exceeding the receiver noise floor, mainly depend on the signal-to-noise ratio at the receiver input (Knyazev A.D. Elements of the theory and practice of ensuring electromagnetic compatibility of radioelectronic devices. - M .: Radio and communication, 1984.- 336 p.). In this case, when solving EMC problems, based on the required signal / noise ratio, the permissible interference power at the receiver input is determined, at which the receiver does not exceed the specified quality and the EMC conditions are considered fulfilled.

The essence of the proposed method for assigning frequencies is as follows.

As in the prototype method, at first, from the entire set of transmitters of the communication system, a group of specific transmitters is identified that can operate simultaneously on a given frequency channel from the operating frequency range with specified parameters of the emitted radio signals, providing radio coverage of the served territory, without exerting an unacceptable effect on the receivers of other electronic funds. A similar identification is made for each frequency channel from the range of working radio frequencies and for each transmitter a set of frequency channels from this range is obtained, each of which can be individually used on this transmitter to operate a communication system providing intersystem EMC with other RES.

To achieve a technical result (improving the EMC conditions within the communication system and the RES of the communication system with other RES), taking into account the group influence of the entire set of transmitters of the communication system, the following actions are also performed.

Using the obtained sets of frequency channels of transmitters of a communication system, frequency channels from these sets are assigned in such a way as to ensure a minimum of the sum of the interference powers created by transmitters of the communication system at the inputs of receivers of other RES and at the inputs of receivers of the communication system. Then the transmitters of the communication system on the frequency channels obtained for them as a result of this purpose are turned on, and the interference power is measured at the inputs of the receivers of the communication system and the inputs of the receivers of other electronic means. After that, the measured values of the interference power are compared with their permissible values.

In this case, the total level of interference generated not only by transmitters of the communication system, but also by other sources of interference (industrial, industrial, etc.) that are independent of the communication system is measured at the input of the receivers. Moreover, the measured noise level in most cases will differ from the calculated one, since the calculation did not take into account external sources of interference with respect to the communication system.

If the interference power exceeds its permissible value and, as a result, the electromagnetic compatibility conditions are not met, at least for one receiver, the transmitter power of the communication system is reduced, which has the most undesirable effect on the receivers of other electronic devices and receivers of the communication system, or, if it is impossible to reduce power of the transmitter, reconfigure the structure of the communication system. Reconfiguration of the communication system structure is carried out in order to increase the mutual distances between the electronic means of the communication system and the electronic means of the communication system with other electronic means.

Then, the frequency channels are again assigned to the transmitters of the communication system so that a minimum of the sum of the interference powers created by the transmitters of the communication system at the inputs of the receivers of other electronic means and at the inputs of the receivers of the communication system is provided, at the same time the transmitters of the communication system on the frequency channels obtained for them as a result of the new destination, measure the interference power at the inputs of the receivers of the communication system and the inputs of the receivers of other electronic equipment, compare the measured values of power interference with their acceptable values and if the conditions of electromagnetic compatibility are not met for at least one receiver, the transmitter power of the communication system is reduced, which has the most undesirable effect on the receivers of other electronic equipment and receivers of the communication system, or if it is impossible to reduce the power of this transmitter, reconfigure the system structure communication, and so on, until the conditions of electromagnetic compatibility for all receivers of the system are satisfied s communication and all the receivers of other radio-electronic means or opportunity will be exhausted to reduce transmitter power communication system or reconfiguring its structure.

Frequency channels are assigned using standard optimization theory methods. In this case, the target function will be the minimum amount of interference power generated by transmitters of the communication system at the inputs of receivers of other RES and at the inputs of receivers of the communication system. In the event that restrictions are imposed on the assignment of frequency channels within the communication system that it is not possible to fulfill by minimizing the proposed objective function, these restrictions are converted into equality constraints or inequality restrictions, which are reduced to a standard form suitable for use in optimization methods , and the optimization problem with constraints is solved.

Thus, the objective function of the considered frequency assignment problem is written in the form:

where M is the number of receivers of other RES;

N is the number of receivers of the communication system;

D is the number of transmitters of the communication system;

P _ig is the power of the NRP created by the g-th transmitter of the communication system at the input of the i-th receiver of other RES;

P _jg is the power of the NRP created by the gth transmitter of the communication system at the input of the jth receiver of the communication system;

f _g is the frequency of the gth transmitter of the communication system;

f _i - frequency of the i-th receiver of other RES;

f _j is the frequency of the jth receiver of the communication system.

The limitations of the frequency assignment problem under consideration are written as a set of expressions of the form:

,

,

where Δf _gj is the required frequency spacing between the gth transmitter of the communication system and the jth receiver of the communication system;

f _{min g} , f _{max g} are the boundaries of the operating frequency range of the gth transmitter of the communication system.

Since the reduced objective function and part of the constraints are nonlinear functions, the problem under consideration relates to nonlinear optimization problems. It is advisable to solve the problem of optimizing frequency assignments using the method of sequential quadratic programming, which is one of the most advanced methods for solving general problems of nonlinear optimization (Izmailov A.F., Solodov M.V. Numerical optimization methods: Textbook. - Manual: FIZMATLIT , 2005 .-- 304 s.).

Due to the fact that optimization is carried out in a continuous set of frequencies, and frequency channels occupy discrete positions on the frequency axis, after the process of optimizing frequency assignments, the obtained frequency values must be rounded to the nearest permitted discrete positions of frequency channels.

The assignment of frequency channels in accordance with the proposed criterion will make it possible to achieve the most acceptable operating conditions for both receivers of other RES and communication system receivers.

Consider an example illustrating the work of the developed method for assigning frequencies of RES.

Let 5 RES be located in a certain region, forming a communication system and using a frequency resource on a secondary basis, and 3 other RES, using a frequency resource on a primary basis. The coordinates of the location of the RES relative to some conditional coordinate origin are given in table 1 (the RES of the communication system is indicated by the letter "N", other RES by the letter "M").

Let the transmitters of the communication system can operate on one of 7 frequency channels. Let the operating frequency of the transmitter of the communication system in this case be determined by the formula:

where D = 1 ÷ 7 is the number of the frequency channel.

Table 1 RES No. X, m Y, m N1 200 200 N2 200 400 N3 300 150 N4 300 350 N5 500 300 M1 250 500 M2 500 400 M3 400 one hundred

The receivers of the communication system have a frequency independent setting from the transmitters and operate at the frequencies given in Table 2.

table 2 RES No. Receiver tuning frequency, MHz N1 1505 N2 1570 N3 1490 N4 1560 N5 1480

Assume that it is not possible to assign a frequency to the transmitter of the communication system that differs by less than 25 MHz from the receiver tuning frequency.

Let the transmitter power of the communication system be 10 watts. All analyzed RES use omnidirectional antennas.

Let the receivers of other RES operate at the frequencies given in table 3.

Let the useful signal power at the inputs of the receivers of other RES

P _c = 10 ^-9 W, and the required signal / (noise + noise) (h) ratio is 10. Suppose that the thermal noise power in the input circuits of the receivers of other RES is negligible compared to the interference power generated by transmitters of the communication system at the inputs receiver data.

Table 3 RES No. Receiver tuning frequency, MHz M1 1510 M2 1535 M3 1560

Let the dependence of the attenuation in the selective systems of the receivers of the communication system on the frequency detuning of the interfering signal be determined by the expression:

and the dependence of the attenuation in the selective systems of receivers of other RES on the frequency detuning of the interfering signal is determined by the expression:

Suppose that the area on which the analyzed RES are located does not have significant local objects in height and losses during the propagation of radio waves can be calculated by the formula (Antonyuk L.Ya., Ignatov V.V. Radio communication efficiency and methods for its assessment. - EAS, 1994 . - 138 p.):

where R is the distance between the RES;

λ is the wavelength of the transmitter acting on the analyzed receiver.

Let the transmitters of the communication system do not have the possibility of reducing power and the structure of the communication system does not allow the possibility of reconfiguration.

It is required to determine the optimal frequency plan for transmitters of a communication system, in which these transmitters create a minimum of interference to receivers of other RES and communication system receivers.

The calculated distance matrix for the RESs of interest is given in table 4.

Table 4 R m N1 N2 N3 N4 N5 M1 M2 M3 N1 0 200 112 180 316 304 361 224 N2 200 0 269 112 316 112 300 361 N3 112 269 0 200 250 354 320 112 N4 180 112 200 0 206 158 206 269 N5 316 316 250 206 0 320 one hundred 224 M1 304 112 354 158 320 - - - M2 361 300 320 206 one hundred - - - M3 224 361 112 269 224 - - -

The matrix of radio wave attenuation in free space calculated in accordance with expression (7) is shown in Table 5.

Table 5 W N1 N2 N3 N4 N5 M1 M2 M3 N1 0 1.610 ⁸ 5.110 ⁷ 1.310 ⁸ 4.110 ⁸ 3.8 · 10 ⁸ 5.310 ⁸ 2.110 ⁸ N2 1.610 ⁸ 0 3 · 10 ⁸ 5.110 ⁷ 4.110 ⁸ 5.110 ⁷ 3.7 · 10 ⁸ 5.310 ⁸ N3 5.110 ⁷ 3 · 10 ⁸ 0 1.610 ⁸ 2.610 ⁸ 5.110 ⁸ 4.210 ⁸ 5.110 ⁷ N4 1.310 ⁸ 5.110 ⁷ 1.610 ⁸ 0 1.710 ⁸ 10 ⁸ 1.710 ⁸ 3 · 10 ⁸ N5 4.110 ⁸ 4.110 ⁸ 2.610 ⁸ 1.710 ⁸ 0 4.210 ⁸ 4.110 ⁷ 2.110 ⁸ M1 3.8 · 10 ⁸ 5.110 ⁷ 5.110 ⁸ 10 ⁸ 4.210 ⁸ - - - M2 5.310 ⁸ 3.7 · 10 ⁸ 4.210 ⁸ 1.710 ⁸ 4.110 ⁷ - - - M3 2.110 ⁸ 5.310 ⁸ 5.110 ⁷ 3 · 10 ⁸ 2.110 ⁸ - - -

Based on the power of the useful signal and the required signal-to-noise ratio (interference + noise), we find the permissible interference power at the inputs of the receivers of other RES:

Based on the data in tables 3 and 5 and expressions (4) and (6), we determine the numbers of frequency channels on which the transmitters of the communication system will not cause unacceptable interference to receivers of other RES. The calculation results are shown in table 6.

Table 6 RES No. M1 M2 M3 Result N1 1, 3, 4, 5, 6, 7 1, 2, 3, 4, 5, 6, 7 1, 2, 3, 4, 5, 6 1, 3,4,5,6 N2 5, 6, 7 1, 2, 3, 4, 5, 6, 7 1, 2, 3, 4, 5, 6 5, 6 N3 1, 3, 4, 5, 6, 7 1, 2, 3, 4, 5, 6, 7 1, 2, 3, 4 1, 3, 4 N4 1, 3, 4, 5, 6, 7 1, 2, 3, 4, 5, 6, 7 1, 2, 3, 4, 5, 6 1.3, 4.5.6 N5 1, 3, 4, 5, 6, 7 - 1, 2, 3, 4, 5, 6 -

An analysis of the data in Table 6 shows that the transmitter of the 5th RES of the communication system will cause unacceptable interference to the receiver with the number "M2" on all frequency channels available for operation and should be turned off, since the RES of the communication system use the frequency resource on a secondary basis.

Based on the requirements of intra-system compatibility for the allowed frequency separation of the transmitters and receivers of the communication system and the data of tables 2 and 6, we obtain the resulting set of allowed frequency channels for transmitters of the communication system (table 7).

Table 7 RES No. Available transmitter frequency channels N1 4, 5, 6 N2 5 N3 3, 4 N4 13

The sum of the interference power at the inputs of the receivers of other RES and at the inputs of the receivers of the communication system for the various combinations of frequency channels available for the transmitters of the communication system is given in Table 8 (the interference power at the inputs of all receivers of other RES and at the inputs of the receivers of the RES of the communication system with numbers was taken into account) N1 "," N2 "," N3 "and" N4 ", because the RES with the number" N5 "is turned off due to the impossibility of fulfilling the conditions of intersystem EMC). The transmitter power of the communication system at the input of its own receiver was not taken into account, since in this case the EMC conditions are provided due to the required frequency separation of 25 MHz.

An analysis of the data in Table 8 shows that the optimal frequency plan corresponding to the minimum amount of interference at the inputs of the receivers of the analyzed RES is achieved with the following assignment of frequency channels to the transmitters of the communication system: channel No. 4 - to the transmitter of the RES with the number "N1", channel No. 5 - to the transmitter of the RES with number "N2", channel No. 4 to the transmitter of the RES with the number "N3", channel No. 3 to the transmitter of the RES with the number "N4". In this case, the total interference power is equal to P _min = 119.4 · 10 ^-12 watts. The average interference power for all variants of the frequency plans, corresponding to the equally probable choice of the variant of the frequency plan according to the prototype method, is P _cp = 133.3 · 10 ^-12 W.

Table 8 Combination number Frequency channel for N1 Frequency channel for N2 Frequency Channel for N3 Frequency Channel for N4 The sum of the interference power,
× 10 ^-12 W one four 5 3 one 137.3 2 four 5 3 3 122.1 3 four 5 four one 130.2 four four 5 four 3 119.4 5 5 5 3 one 139.8 6 5 5 3 3 131.5 7 5 5 four one 135.4 8 5 5 four 3 122.7 9 6 5 3 one 144.5 10 6 5 3 3 133.7 eleven 6 5 four one 149.2 12 6 5 four 3 133.9

The effectiveness of the proposed method of assigning frequencies in comparison with the prototype method is determined by the expression:

Substituting into the expression (8) the calculated values of P _min and P _cf , we find that for the considered example, the proposed method for assigning frequencies in comparison with the prototype method reduces the total interference power at the inputs of the receivers of the analyzed RES by 10.4%.

Thus, the distinctive features of the proposed method of assigning frequencies to electronic means provide the emergence of new properties not achieved in the prototype and analogues. The analysis made it possible to establish that there are no analogues with a set of features identical to all the features of the claimed technical solution, which indicates the compliance of the claimed method with the condition of patentability "novelty".

The search results for known solutions in the field of communications in order to identify signs that match the distinctive features of the prototype of the proposed method showed that they do not follow explicitly from the prior art. Also, the popularity of the influence of the actions provided for by the essential features of the claimed invention on the achievement of the specified result has not been revealed. Therefore, the claimed invention meets the condition of patentability "inventive step".

Claims (1)

A method of ensuring electromagnetic compatibility of a communication system that works with other electronic means in the same operating frequency range, which consists in identifying a group of specific transmitters that can operate simultaneously on a given frequency channel from the operating frequency range with the given frequencies from the entire set of transmitters of the communication system parameters of the emitted radio signals providing radio coverage of the served territory, without exerting an unacceptable effect on the receivers of other radio electronic means, such identification is made for each frequency channel from the range of working radio frequencies and for each transmitter a set of frequency channels from this range is obtained, each of which can be individually used on this transmitter to operate the communication system with inter-system electromagnetic compatibility, and during operation communication systems, each transmitter is switched on on a frequency channel selected from the set of frequency channels obtained for it, subject to compliance with the intrasystem electron compatibility, characterized in that after determining for each transmitter of the communication system a set of frequency channels, assign to each transmitter of the communication system frequency channels from the received sets of frequency channels in such a way as to ensure a minimum of the sum of the interference powers created by the transmitters of the communication system at the inputs of receivers of other electronic means and at the inputs of the receivers of the communication system, then simultaneously turn on the transmitters of the communication system on the frequency channels obtained for them as a result of purpose, after which the interference power is measured at the inputs of the receivers of the communication system and the inputs of the receivers of other electronic devices, the measured values of the interference power are compared with their permissible values, and if the conditions of electromagnetic compatibility are not fulfilled, at least one receiver reduces the power of the transmitter of the communication system that has the most strong undesirable effects on receivers of other electronic equipment and receivers of the communication system, or, if it is impossible to reduce power of this transmitter, reconfigure the structure of the communication system, then again assign frequency channels to the transmitters of the communication system so as to ensure a minimum of the sum of the interference power generated by the transmitters of the communication system at the inputs of the receivers of other electronic devices and at the inputs of the receivers of the communication system, simultaneously turn on the transmitters of the communication system frequency channels obtained for them as a result of a new purpose, measure the interference power at the inputs of the receivers of the communication system and the inputs of the receiver other electronic means, compare the measured values of the interference power with their permissible values and if the conditions of electromagnetic compatibility are not met for at least one receiver, the transmitter power of the communication system is reduced, which has the most undesirable effect on the receivers of other electronic means and receivers of the communication system, or, when the impossibility of reducing the power of this transmitter, reconfigure the structure of the communication system, and so on, until Execute the EMC environment for all the receivers of the system of communication and all the receivers of other radio-electronic means, or are exhausted opportunities to reduce transmitter power communication system or reconfiguring its structure.