RU2643154C1 - Single-position multiplicative virtual-real method for determining coordinates of radio-frequency source location - Google Patents

Abstract

FIELD: radio engineering, communication.

SUBSTANCE: method is based on the energy principle, which consists in measuring (or calculating) the strength of the RFS field and at several space points with known coordinates of their location. The strength of the RFS field is measured on the RCP, and is calculated at the additional point (points). A virtual post (VP), whose coordinates and parameters of its virtual antenna (directional pattern and suspension height) are specified, is proposed as an additional point in the method. When using n VP, they are "placed" not in line with the RCP and are "spaced" from it by latitude and (or) by longitude by several arc minutes. The calculation of the strength on the VP is based on the principle of the correlation dependence (CD) of the field strengths created in a given frequency range by a pularity of radio-frequency sources located in the electromagnetic accessibility zone of the RSC according t the data base and calculated by a certain program both for the RCP and for all given VP.

EFFECT: determination of source location without the use of direction finders and radio receivers with autocorrelators.

2 cl, 7 dwg, 2 tbl

Description

A single-position multiplicative difference-relative method for determining the coordinates of the location of radio emission sources (IRI) relates to the field of radio engineering, namely, radio monitoring systems for determining the location of radio frequency sources of the VHF-microwave ranges, both digital and analog modes of communication, information about which is not available in the database (e.g., the State Radio Frequency Service or the State Communications Supervision Service). The invention can also be used in the search for the location of radio communications, as possible sources of communication interference.

Known methods for determining the coordinates of the IRI, in which passive direction finders are used in an amount of at least three, the center of gravity of the region of intersection of the revealed azimuths of which at the wave arrival front is taken as the location estimate. The basic principles of operation of such direction finders are amplitude, phase, and interferometric [1, 2]. Their disadvantages include a high degree of complexity of antenna systems, switching devices and the presence of multi-channel radios.

The presence in the federal districts of the state radio-frequency service interconnected through a central point of an extensive network of radio monitoring posts (RCP) equipped with means for receiving radio signals, measuring and processing their parameters, allows you to supplement their functions and tasks of determining the location of those IRI, information about which is not in the database, is not resorting to the use of complex and expensive direction finders.

Of other known methods and devices, close analogues of the proposed method according to the technical nature and intended for use in radio monitoring, can be [3, 4].

The method [3] is based on the reception of signals by three antennas forming two pairs of measuring bases, measuring the differences in the arrival time of the IRI signals and deterministic calculations of the desired coordinates.

The disadvantages of the method include:

1. A large number of antennas.

2. The method is not focused on the use of RCP.

3. The measuring base for calculating the difference in the time of arrival of the IRI signals by antenna pairs significantly limit the separation of these antennas, not to mention the inappropriateness and great technical complexity of the method.

Diversity difference-range direction finding [4], consisting of two peripheral points, a central and a single time system. The peripheral points are intended for receiving, storing, processing signals and transmitting signal fragments to the CPU, on which the difference of the signal arrival time is calculated. In the system of single time, a chroniser is used, which represents the keeper of the current time scale (hours) attached to the scale of the single time, designed to bind the signal level values recorded in the memory to the value of the reception time.

This direction finder has the following disadvantages:

1. Not adapted to the RCP used in the branches of the federal districts of the state radio frequency service or the state service for supervision of communications.

2. A large number of specialized direction finding (but not radio monitoring) posts.

3. Unreasonable and unrevealed (at least up to the functional diagram) application of a single time system on a CPU and time clocks on a PC synchronized with a single time system.

4. The need for radio channels with high bandwidth (up to 625 Mbaud) for the transmission of even fragments of signals from PP1 and PP2 to the CPU.

5. To organize a radio channel, radio transmitting devices and obtaining permission for their operation in certain operating conditions are required.

The closest analogue selected for the prototype of the proposed method is [5].

The method [5] relates to passive radio monitoring systems and is intended to determine the coordinates of the sources of radio waves of the VHF-microwave ranges using digital (discrete) types of signals from one RCP. The method for determining the location of the IRI is based on measuring the direction of the IRI, estimating the relative time delay, followed by calculating the coordinates of the IRI as the point of intersection of the direction line to the source and the hyperbolic position line. All measurements are made at one receiving point. Moreover, the estimate of the relative time delay is determined by determining the discrepancy in the time of arrival of the signal from the source relative to the reference time scale, formed on the basis of the estimate of the time structure of the signal of the source, the location of which is assumed to be known, determined by comparing the estimates of the discrepancy in the time of arrival of signals from the sources with the known and estimated location, operating in a single synchronization system with digital (discrete) types of signals.

The disadvantages of the prototype are:

1. The method applies only to digital (discrete) types of communications with a clearly defined pulse repetition period of clock (cycle) synchronization, operating in a single synchronization system, the time parameters of which and the accuracy of their determination significantly affect the estimation of the relative time delay, and therefore and the accuracy of determining the coordinates of the desired IRI.

2. There is no decision to improve the accuracy of estimating the coordinates of the desired IRI, for example, by increasing the number of correspondents from the radio network and averaging the results of calculating the coordinates of the desired IRI for each of the radio network correspondents;

3. The frequency-time structure of the signal (frequency (period) of the following pulses of clock (cycle) synchronization) should be a priori known (or accessible to estimation). Moreover, the estimation of the frequency-time structure of the signal leads to the appearance of an additional error in calculating the coordinates of the desired IRI and the appearance of additional time and hardware costs when implementing the method.

4. The scope of the method is limited to the fact that for the implementation of the method it is necessary to have:

a) a special radio receiving device, in which an autocorrelator must also be introduced;

b) a direction finder that meets the requirements for sufficient direction finding accuracy, based on the accuracy of determining the coordinates of the desired IRI.

и

мультипликативных функций, представляющих сочетания, взятые по два и по три, разностей отношений расстояний от ВП к расстоянию РКП до местоположения ПТ, и вычисленных

парных сочетаний (n+1) обратных отношений напряженностей сигналов искомого ИРИ, соответствующих этим расстояниям, а затем равномерно или дихотомически, или методом наискорейшего спуска изменяют значение одной из координат ПТ при неизменном значении ее другой и находят точки экстремумов

или перегиба

мультипликативных функций, координаты которых по всем М₂ и М₃ сочетаниям корректируют по калибровочным характеристикам пар РКП - ВП, представляющим зависимости разности вычисленных координат ПТ и истинных координат источников радиоизлучений, известных по соответствующей базе данных, как функцию ошибки определения координат, а потом усредняют и фиксируют как окончательные координаты местоположения искомого ИРИ,The aim of the present invention is to develop a method for determining the location coordinates of the IRI VHF-microwave ranges from one RCP without the disadvantages inherent in the prototype. This goal is achieved using the features specified in the claims, common with the prototype: a method for determining the coordinates of the location of the IRI, based on measuring the parameters of the desired IRI on one RCP and calculating the same parameters at points whose location is assumed to be known, and distinguishing features consisting in that both digital and analog modes of communication are used and the field strength of the desired IRI is measured, using, in addition, RCP with a log-periodic rotary antenna system (LPAS), the coordinates of the field If n (more than or equal to two) virtual posts (VPs) are not lying on the same straight line and are located at a distance of several angular minutes relative to the RCP, they divide the zone of electromagnetic accessibility around the RCP into k azimuth sectors, setting the limiting values of the coordinates of their points, calculate according to a specialized program [6] or a similar program, the field strength at the location of n (more than or equal to two) VP and RCP created by each of the sources of radio emission of a given frequency range located in all k azimuthal seconds nuts, establish a correlation between the field strengths at each of n VP and the field strength at the RCP, measure the field strength from the desired IRI on the last one, and determine the field strength at the corresponding VP for its azimuthal sections with a maximum correlation coefficient, after which set the coordinates of the location of the test point (PT), as the current location of the desired source of radio emission, are

and

multiplicative functions representing combinations of two and three, differences in the ratio of the distances from the VP to the distance of the RCP to the location of the PT, and calculated

paired combinations of (n + 1) inverse ratios of the signal strengths of the desired IRI corresponding to these distances, and then uniformly or dichotomously, or by the method of steepest descent, change the value of one of the coordinates of the PT at the same value of its other and find the points of extrema

or inflection

multiplicative functions, the coordinates of which for all M ₂ and M ₃ combinations are adjusted according to the calibration characteristics of the RCP - VP pairs, which are the dependences of the difference between the calculated coordinates of the PT and the true coordinates of the sources of radio emissions, known from the corresponding database as a function of the error in determining the coordinates, and then averaged and fix as the final coordinates of the location of the desired IRI,

in addition, characterized in p. 1 in that, according to the measured azimuth and the coordinates of the location of the RCP, they compose the equation of the azimuthal straight line and move the test point along it, and the preliminary coordinates of the location of the test point on this straight line are set at the maximum distance from the RCP, in accordance with its zone electromagnetic accessibility.

The initial conditions for implementing the method of on-off determination of the coordinates of the location of the IRI are:

1. The antennas of the sought sources of radio emission are non-directional.

2. The measurement conditions and the location of the desired IRI during the measurement and calculation of the coordinates of its location do not change. These conditions, in most cases, are fulfilled and do not limit the application of the method.

The claimed method is illustrated by drawings, which show:

FIG. 1 - the location of the RCP, VP and IRI, the initial and intermediate position of the PT;

FIG. 2 - correlation dependence of field strengths for a pair of RCP - VP1 and polynomials approximating them, correlation coefficient R = 0.816;

FIG. 3- a change in two pairwise products of the differences in relations in a sequential search for the location of the IRI;

FIG. 4 - change in the product of three differences in relations in a sequential search for the location of the IRI;

FIG. 5 - calibration characteristic of the pair RCP - VP in latitude;

FIG. 6 - calibration characteristic of the pair RCP - VP in longitude;

FIG. 7 - the location of the RCP, VP, the initial, one intermediate and final position of the PT.

The method is based on the energy principle, which consists in measuring (or calculating) the IRI field strength at several points in space with known coordinates of their location. In this case, the field strength of the IRI on the RCP is measured, and calculated at an additional point (s). As an additional point in the method, a virtual post (VP) is proposed, the coordinates of which and the parameters of its virtual antenna (radiation pattern and suspension height) are set. When using n VP, they are not located on a straight line with the RCP and are separated from it by several angular minutes. In FIG. 1 shows the conditional arrangement of VP, RCP and IRI. The directivity pattern of the virtual antenna and the height of its suspension are selected the same as on the RCP. The calculation of the voltage at the airspace is based on the principle of the correlation of the field strengths generated in a given frequency range by a variety of radio sources located, according to the database, in the electromagnetic zone of the RCP and calculated both for the RCP and for all the given airplanes according to a certain program [6] . As an example, in FIG. Figure 2 shows the correlation dependence of the field strengths between the RCP and one of the EPs. Namely, for a pair of VP1 and RCP, the correlation coefficient, showing the tightness of the relationship between the field strengths, is R = 0.816. For other EPs that are 3 and 5 arc minutes longitude from the RCP, in particular for VP2 and VP3, their correlation coefficients with the field strength at the RCP, as well as with each other, are shown, as an example, in Table 1 below:

Preliminarily, the zone of electromagnetic accessibility of the RCP relative to the latter is divided into k azimuthal sectors with a width of each sector equal to the error in determining the azimuth used for this purpose, LPAS. Such a correlation dependence is obtained for all k azimuthal sectors. Then, for azimuthal sectors with a high correlation coefficient of the field strengths of the RCP - VP pairs, for example, more than 0.7, and the field strength of the desired IRI measured on the RCP, the strength at the corresponding VP is determined. Based on the received pairs of RCP - VP field strengths, the IRI location parameters are successively determined: latitude - Xi and longitude - Yi according to the criterion for reaching the extremum point by the multiplicative function of the differences in the ratios of the distances of the IRI location to each of the corresponding locations of the RCP - VP pairs and the corresponding inverse relations of signal levels obtained in these pairs and taken in combinations of two or reaching the inflection point of the same multiplicative functions taken in combinations of three.

. Затем вычисляют попарные отношения этих расстояний. Обозначив РКП индексом 1, а индексами 2, 3, 4…n соответствующие ВП, эти отношения представим в виде, например,

,

,

и т д. Таких отношений, назовем их прямыми, всего для одного РКП и n ВП может быть получено

. Но есть и инверсные отношения, такие, например, как

. Их количество также равно

. Всего может быть составлено

отношений для расстояний. Аналогичные отношения составляют и для прямых отношений напряженностей полей

,

,

и т.д. и инверсных отношений, таких, например, как

и их комбинаций. Всего прямых и инверсных отношений напряженностей может быть также составлено

. Полученные отношения сравнивают, путем вычитания, и получают функцию F попарных разностей отношений расстояний и обратных им отношений напряженностей. Например, эту разность для РКП и ВП₁ определяют как F₁₂₌(n_12i-n₂₁). Для ВП₂ и ВП₃ - как F₂₃=(n_23i-n₃₂).Let's consider getting multiplicative functions in more detail. After setting the initial position of the PT, by assigning coordinates to it, calculate the distance from the i-th location of the PT to each j-th point, including one RCP and all n VP (j = n + 1), according to the formula

. Then calculate the pairwise ratios of these distances. Denoting the RCP by index 1, and by the indices 2, 3, 4 ... n the corresponding EPs, we represent these relations in the form, for example,

,

,

etc. Such relations, let us call them direct, for only one RCP and n VP can be obtained

. But there are inverse relationships, such as

. Their number is also equal

. Total can be made up

relationships for distances. Similar relationships are for direct relationships of field strengths

,

,

etc. and inverse relationships, such as, for example

and their combinations. Total direct and inverse tension relations can also be made up

. The obtained relations are compared, by subtraction, and a function F of pairwise differences of the distance relations and the inverse tension relations is obtained. For example, this difference for RCP and VP ₁ is defined as F _{12 =} (n _12i -n ₂₁ ). For VP ₂ and VP ₃ - as F ₂₃ = (n _23i -n ₃₂ ).

функций. Из этих попарных разностей отношений составляют первый вид мультипликативных функций попарных произведений разностей отношений F₁ Например, для пары РКП и ВП₂ и пары ВП₂ и ВП₃ получают F_1,12.23=F₁₂*F₂₃.Such functions F pairwise differences of the distance relations and the inverse relations of the field strengths of their combinations in total can also be composed

functions. Of these pairwise differences of relations, the first type of multiplicative functions of pairwise products of difference of relations F ₁ is compiled. For example, for a pair of RCP and VP ₂ and a pair of VP ₂ and VP ₃ , F _1.12.23 = F ₁₂ * F _{23 is} obtained.

функций F₁, для которых, с целью определения координат местоположения искомого ИРИ, находят их экстремумы. Примеры графического отображения таких функций приведены на фиг. 3. Составляют также функции F₂ произведения трех разностей отношений отношений F. Например, для РКП и ВП₃: F_{2 12.23.31}=F₁₂*F₂₃*F₃₁, Всего может быть составлено

функций F₂, для которых находят их точки перегиба. Примеры графического отображения таких функций приведены на фиг. 4. Координаты местоположения искомого ИРИ, при этом, могут вычисляться методом последовательного приближения, методом наискорейшего спуска или по методу дихотомии, например, методу поразрядного уравновешивания или другим методом. Для использования, например метода поразрядного уравновешивания, априори должны быть известны диапазоны D значений искомых величин. Эти диапазоны обычно известны, исходя из известных параметров зоны электромагнитной доступности используемых РКП. В соответствии с алгоритмом поразрядного уравновешивания, первоначально, путем присвоения, пробной точке (ПТ) задают, в качестве координат начального ее местоположения (см. фиг. 1.), среднее из диапазона D значение определяемой величины (например, широты) при фиксированных, но лежащих в известных диапазонах значений долготы. Если значение мультипликативной функции окажется меньше нуля, то к первоначальному значению широты местоположения ПТ добавляют 1/4 часть диапазона по широте. В противном случае из первоначального значения широты вычитают 1/4 часть диапазона ее значения. Затем опять производят вычисление расстояний от нового положения ПТ до РКП и ВП и оценку результатов сравнения, как описано выше. При этом добавляют (или вычитают) уже 1/8 часть диапазона, затем 1/16 часть и т.д. Такие итерации продолжают до тех пор, пока результат сравнения не окажется по модулю меньше заранее заданного значения погрешности дискретизации каждого параметра местоположения

, где m - количество итераций. После определения промежуточного положения ПТ (см фиг. 1), с координатой по широте, ближайшей к широте местоположения искомого ИРИ, приступают к вычислению по такому же алгоритму следующей координаты местоположения ПТ-долготы. Найденные координаты всех точек экстремумов

и перегиба

мультипликативных функций по всем М₂ и М₃ сочетаниям представляют координаты конечного положения ПТ. Эти координаты корректируют по калибровочным характеристикам (КХ) пар РКП - ВП. КХ представляет зависимость разности истинных значений широт и долгот местоположения источников радиоизлучений, известных по соответствующей базе данных, так называемых базовых ИРИ, и вычисленных для тех же источников радиоизлучений значений широт и долгот, полученных в точках экстремума и перегиба мультипликативных функций, как функцию ошибки определения координат. КХ получают для всех пар РКП - ВП всех k азимутальных секторов. На фиг. 5 показан пример КХ по широте, а на фиг. 6 - по долготе. После корректировки координат конечного положения ПТ координаты усредняют по всем точкам экстремума и перегиба, и фиксируют, уже как окончательные координаты местоположения ПТ. То есть фиксируют, как искомые координаты местоположения ИРИ.For a pair of RCP and VP ₂ and a pair of RCP and VP ₃ - F _1.12.31 = F ₁₂ * F ₃₁ , etc. The total can be composed

functions F ₁ , for which, in order to determine the location coordinates of the desired IRI, their extremes are found. Examples of graphical display of such functions are shown in FIG. 3. The functions F _{2 are} also composed _{of the} products of the three differences in the relations of relations F. For example, for the RCP and VP ₃ : F _{2 12.23.31} = F ₁₂ * F ₂₃ * F _31. In total, it can be composed

functions F ₂ for which their inflection points are found. Examples of graphical display of such functions are shown in FIG. 4. The location coordinates of the desired IRI, in this case, can be calculated by the method of successive approximation, by the method of steepest descent, or by the method of dichotomy, for example, the method of bitwise balancing or other method. To use, for example, the method of bitwise balancing, a priori, the ranges D of the values of the sought quantities must be known. These ranges are usually known based on the known parameters of the electromagnetic accessibility zone used by the RCP. In accordance with the bitwise balancing algorithm, initially, by assigning, the test point (PT) is set, as the coordinates of its initial location (see Fig. 1.), the average value from the range D of the determined value (for example, latitude) at fixed but lying in known ranges of longitude values. If the value of the multiplicative function turns out to be less than zero, then 1/4 of the latitude range is added to the initial value of the latitude of the PT location. Otherwise, 1/4 of the range of its value is subtracted from the original latitude value. Then again calculate the distances from the new position of the PT to the RCP and VP and evaluate the results of the comparison, as described above. In this case, 1/8 of the range is added (or subtracted), then 1/16 of the range, etc. Such iterations continue until the result of the comparison is in absolute value less than a predetermined value of the sampling error of each location parameter

where m is the number of iterations. After determining the intermediate position of the PT (see Fig. 1), with the latitude coordinate closest to the latitude of the location of the desired IRI, they proceed to calculate the following coordinate of the PT longitude location using the same algorithm. The found coordinates of all extreme points

and inflection

multiplicative functions for all M ₂ and M ₃ combinations represent the coordinates of the final position of the PT. These coordinates are adjusted according to the calibration characteristics (KX) of the RCP - VP pairs. The KH represents the dependence of the difference between the true latitude and longitude values of the location of radio emission sources known from the corresponding database, the so-called basic IRI, and the latitude and longitude values calculated for the same sources of radio emission obtained at the points of extremum and inflection of multiplicative functions, as a function of the coordinate determination error . KX is obtained for all pairs of RCP - VPs of all k azimuthal sectors. In FIG. 5 shows an example of a latitudinal latitude, and FIG. 6 - in longitude. After adjusting the coordinates of the final position of the PT, the coordinates are averaged over all points of the extremum and inflection, and fixed, already as the final coordinates of the location of the PT. That is, fix, as the desired coordinates of the location of the IRI.

Due to averaging, they increase the accuracy of determining the coordinates, which substantially depends on the total number of averagings M = M ₂ + M ₃ , determined by the number of VP. To assess the accuracy of determining the coordinates, we present Table 2 for a different number of VIs.

The table shows that, in contrast to the prototype, estimates of the average linear and standard deviation of the calculated coordinates can be significantly improved. For example, with n = 5, the accuracy of the average linear deviation increases by more than 17000 times, and the standard deviation by more than 130 times than with a single calculation in the prototype.

So, algorithmically, the method according to p. 1 of the claims provides for the following operations:

1. At the RCP, the field strength of the desired IRI is changed.

2. Break the zone of electromagnetic accessibility of the RCP into k azimuth sectors with a width of each not exceeding twice the average error in determining the azimuth used for this purpose by the LASP, setting the limit values of the coordinates of the sectors.

3. Set the coordinates of n VP, not lying on the same line with the RCP and located from him at a distance of several angular minutes.

4. Calculate the field strengths on the RCP and in each EP from radiation sources located in each of the k azimuth sectors according to the RCP database using the program [6] or the like.

5. Establish the correlation dependence and the calibration characteristic of the RCP - VP pairs between the calculated field strengths on the RCP and at the location of each of the n VPs for all k azimuthal sectors.

6. From the measured field strength of the desired IRI and correlation dependences measured at the RCP, the field strength at each of the n VPs is determined.

7. Calculate the direct and inverse ratios of field strengths on the RCP and VP in all combinations.

8. Choose a method for determining the location coordinates of the desired IRI: the method of successive approximation, dichotomous (described above) or the method of accelerated descent, or any other.

9. Set the initial coordinates of the location of the PT, as a point of the possible location of the desired IRI.

10. Calculate the distance R _1i from the i-th point of the location of the PT to the RCP and the distance R _1i to the j-th VP _j .

11. Calculate the direct about the inverse relationship of distances in all combinations.

и

мультипликативных уравнений, представляющих произведения разностей попарных отношений расстояний от РКП или ВП до ПТ и соответствующих обратных отношений напряженностей поля, взятых в сочетаниях по два и по три.12. Make up

and

multiplicative equations representing the products of the differences of the pairwise relations of the distances from the RCP or VP to the PT and the corresponding inverse relations of the field strengths, taken in combinations of two and three.

13. Calculate, in accordance with the selected method, the coordinates of the location of the point until the multiplicative equations reach the points of extremum or inflection, using as the field strength on the RCP and VP the values obtained in paragraph 1 and paragraph 6.

или перегиба

мультипликативных функций по всем М₂ и М₃ сочетаниям корректируют по калибровочным характеристикам пар РКП-ВП.14. The found coordinates of all extreme points

or inflection

the multiplicative functions for all M ₂ and M ₃ combinations are adjusted according to the calibration characteristics of the RCP-VP pairs.

15. The calibrated coordinates of the location of the desired IRI are averaged over all M = M ₂ + M ₃ combinations of multiplicative functions and recorded as the final coordinates of the location of the sought source of radio emission.

, заданной координатами местоположения РКП и измеренным азимутом ϕ на ИРИ. Такой принцип существенно повышает скорость определения координат искомого ИРИ и. наряду с усреднением по всем возможным сочетаниям М=М₂+М₃ мультипликативных функций, повышает не только быстродействие, но и точность определения координат.The implementation of the method according to claim 2 of the claims is illustrated in FIG. 7, which shows the azimuthal line, the placement of the RCP and VP, located around it at a distance of several angular minutes, the initial, one intermediate and final position of the PT, as well as the straight lines connecting the two VP, chosen to explain the principle of operation, with the RCP and the initial, intermediate and final position PT. According to the measured azimuth ϕ and the coordinates of the location of the RCP are the equation of the azimuthal straight line, and PT move along it. Initially, the position of the PT is set with its maximum distance from the RCP, in accordance with the zone of its electromagnetic accessibility. Then, on the azimuthal straight line, by any method, including numerical method, for example, by halving, find the position of the PT in which the multiplicative function, which expresses in two different combinations two or three products of the difference of the relations described in detail in paragraph 1 above, will not reach extremum or inflection points. Thus, unlike p. 1, PTs are not moved across the entire space of possible positions of the desired IRI, but only along the azimuthal line

defined by the coordinates of the location of the RCP and the measured azimuth ϕ in the IRI. This principle significantly increases the speed of determining the coordinates of the desired IRI and. along with averaging over all possible combinations of M = M ₂ + M ₃ multiplicative functions, it increases not only speed, but also the accuracy of determining coordinates.

The analysis of the prior art allows us to establish that the analogues and the closest of them are the prototype, characterized by a combination of features that are identical to all the features of the proposed method for determining the coordinates of the IRI, are absent and, therefore, the claimed method has the property of novelty.

The study of known solutions in this and related fields of technology in order to identify signs that match the distinctive features of the prototype of the features of the proposed method showed that it does not follow explicitly from the prior art, from which the influence of transformations provided for by the essential features of the claimed invention is also not known, to achieve the specified result, which allows us to consider the claimed object corresponding to the level of patentability "inventive step".

Information sources

1. The collection of materials of continuing education courses for specialists of radio frequency centers of federal districts. Book 2. - SPb .: SPbSUT. 2003.

2. Lipatnikov V.A., Solomatin A.I., Terentyev A.V. Direction finding. Theory and practice. SPb YOU, 2006 - 356 s.

3. Difference-range measuring method of direction finding of a source of radio emission. RF patent №2325666 C2. Authors: Saibel A.G., Sidorov P.A.

4. Diversity differential range finder direction finder. RF patent No. 2382378, C1. Authors: Ivasenko A.V., Saibel A.G., Khokhlov P.Yu.

5. A method for determining the sources of radio emissions. Patent No. 2285884 C2. Author (s): Luzinov V.A. (RU), Ustinov K.V. (RU).

6. Design and analysis of radio networks. Description and instruction manual. Yaroslavl, 2009.

Claims (2)

1. A single-position multiplicative difference-relative method for determining the location coordinates of radio emission sources, based on measuring the parameters of the desired source of radio emissions (IRI) at one radio monitoring station (RCP) and calculating the same parameters at points whose location is assumed to be known, characterized in that it is used for both digital and analog modes of communication, and at the same time, the field strength of the desired IRI and the azimuth to it are measured using RCP with a log-periodic rotary antenna system (LAS), at a distance of several angular minutes relative to the RCP, specify the coordinates of the location n, more than or equal to 2, virtual posts (VP) that are not lying on the same line with it, divide the electromagnetic accessibility zone around the RCP into k azimuth sectors, calculate the field strength at the location of n VP and RCP created by each of the sources of radio emission of a given frequency range located in all k azimuthal sectors, establish a correlation between the field strength at each of n VP and voltage by the field strength at the RCP, the field strength from the sought-after source of radio emission is measured at the last and the azimuthal sectors with the maximum correlation coefficient are determined by its magnitude, and therefore the field strength at the corresponding airspace, and then the coordinates of the location of the radiation source are searched over the entire electromagnetic accessibility zone RCP, for which: set the coordinates of the location of the test point (PT), as the current location of the desired IRI, are

and

multiplicative functions representing combinations of two and three, differences in the ratio of the distances from the VP to the distance of the RCP to the location of the PT, and calculated

paired combinations of (n + 1) inverse ratios of the field strengths of the signals of the desired IRI corresponding to these distances, and then uniformly or dichotomously, or by the method of steepest descent, change the value of each of the coordinates of the PT with the constant value of its other coordinate and find the points of extrema

or inflection

the multiplicative functions of the location of the PT, the coordinates of which for all M ₂ and M ₃ combinations are adjusted according to the calibration characteristics of the RCP-VP pairs, representing the dependences of the difference between the calculated coordinates of the PT and the true coordinates of the sources of radio emissions, known from the corresponding database, as a function of the error in determining the coordinates of the PT, and then the latter are averaged and then fixed as the final coordinates of the location of the desired IRI. 2. The method according to p. 1, characterized in that according to the measured azimuth and the coordinates of the location of the RCP are the equation of the azimuthal line and the test point is moved along it, and the preliminary coordinates of the location of the test point on this line are set at the maximum distance from the RCP in accordance with its zone electromagnetic accessibility.

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