RU2707878C1 - Method and device for active radio ranging of earth station location - Google Patents

Abstract

FIELD: radio equipment.

SUBSTANCE: inventions relate to radio engineering and can be used for protection against air and space radio monitoring equipment. Said result is achieved by selecting I satellites relay adjacent to the used (RS) having similar characteristics, determining the coordinates of the earth station (ES) and the I selected RSs, the direction of these RSs, calculating the distance between the ES and the RS, the value of the interference signal required for emitting power in the direction of each RS, I additional antennas are oriented in the direction of the corresponding RS, and as active masking interference there used are different delayed pseudorandom law and ES-optimized signals. Device for active radio ranging of ES location comprises splitter, unit of buffer stages, I-channel radio transmitter, unit of directed antennae, a pseudorandom sequence generator, a unit for calculating signal power, a communication distance calculation unit and four input buses with corresponding links.

EFFECT: provision of difficulty of determining the earth station (ES) location.

3 cl, 10 dwg

Description

The inventive objects are united by one inventive concept, relate to radio engineering and can be used to protect against airborne and space radio monitoring.

Known devices based on the method of active radio masking (see Pat. RF No. 2170493, 2224376), based on the creation of induced masking noise interference in the entire frequency band used. The method protects information from unauthorized access to it. The main disadvantage of this method is the inability to hide the location of the protected source of radio emission (IRI).

A known method of active radio masking (see Pat. RF No. 2495527, 2525299, 2543078 and others), based on the distortion of the navigation field formed by the global navigation satellite system (GNSS). The method makes it difficult to determine the coordinates of the protected object. However, the effect of the analog does not apply to Iran. The location of the latter is determined by known methods and devices (see, for example, Pat. RF No. 2659808).

The closest in technical essence is the method of active radio masking of electronic equipment by active jamming stations (see Pat. RF No. 2632219, IPC H04K, publ. 03.10.2017, bulletin No. 28). In the prototype, active masking is carried out by emission, relaying of noise interference or imitating and false signals, coupled and synchronized with the signals of the masked electronic means (RES) so that the active interference is as close as possible to the parameters of the electronic means, form an active interference in the form of an additive mixture of station signals active interference (SAP) and RES by simultaneous and synchronous emission of information and interference signals RES and SAP with the ability to provide both iomaskirovki RES jamming stations and radio camouflage SAP radio electronic means, wherein the electromagnetic compatibility of SAP and a receiving device RES ensure compliance with their spatial separation through the use of a directional antenna on EPS and EPS orientation antenna directivity pattern with respect to the antenna pattern RES radio receiving apparatus.

The prototype provides an increase in the effectiveness of active radio masking of electromagnetic radiation from RESs by pairing and synchronizing the operation of SAP and RES, making it difficult to analyze and receive them by means of space R and RTR. However, the modern development of geolocation methods in these conditions allows us to obtain separate coordinates on the SAP and RES (see Volkov R.V., Sevidov V.V. Geolocation accuracy by the difference-ranging method using satellite transponders in geostationary orbit // Izvestiya SPbGETU " LETI ”, No. 9, 2014, pp. 12-18; Volkov RV, Sayapin VN, Sevidov VV Algorithm for determining the coordinates of earth stations from signals from satellite transponders // Theory and Practice of Modern Science, No. 10 (16), 2016. Electronic scientific journal).

The aim is to develop a method of active radio masking, which makes it difficult to determine the location (WMD) of an earth station (AP).

необходимой для излучения мощности помехового сигнала в направлении каждого из выбранных i-тых спутников-ретрансляторов, i=2, 3, … I, а ЗС ССС дополнительно оборудуют I направленными антеннами, которые ориентируют в направлении соответствующих спутников-ретрансляторов, и I-канальным когерентным радиопередатчиком, а в качестве активной маскирующей помехи в I дополнительных каналах радиопередатчик - направленная антенна используют отличные между собой задержанные по псевдослучайному закону и оптимизированные по мощности

сигналы ЗС.This goal is achieved by the fact that in the known method of active radio masking of the location of the AP, consisting in radiation, relaying of noise interference or imitating and false signals, coupled and synchronized with the signals of the earth station, at the preparatory stage, I isolate I adjacent to the used satellite transponders (CP ), i = 2, 3, ... I, having the same frequencies of the uplink, the polarization of the antenna system and the coverage area, determine the coordinates of the AP [X, Y, Z) of the _AP and the selected CP (X, Y, Z) _i , direction ( θ, β) _i to the selected CP , calculate the distance between the AP and the relay satellites, determine the values

required for radiation power of the interfering signal in the direction of each of the selected i-th satellite transponders, i = 2, 3, ... I, and the CCC CCS are additionally equipped with I directional antennas, which are oriented in the direction of the corresponding satellite transponders, and I-channel coherent radio transmitter, and as an active masking noise in I additional channels, the radio transmitter - directional antenna uses excellent interconnected pseudo-random law and optimized in power

AP signals.

The above-mentioned new set of essential features due to the fact that, together with the emissions of the pollutants, synchronized with the main signal, it emits time-shifted copies of it to neighboring (selected) relay satellites (CP), which allows achieving the purpose of the invention. The cross-correlation function (CCF) of the aggregate of such signals represents a set of both true and false correlation peaks. As a result, it is difficult to determine the location of the AP, and, therefore, the objective of the invention is achieved: the proposed method does not hide the true position of the AP, but “disguises” it in the group of other, false positions.

A device for radio masking is known (see Pat. RF No. 2170493, IPC H04K 3/00, publ. 10.07.2001, bull. No. 19). It contains a noise generator made in the form of a system of coupled two generators, an active antenna circuit in the form of a magnetic dipole, an adjustable delay line, and a source of low-frequency noise. The device provides increased stability of the process of radio masking of transmitted information in the entire band of used frequencies. However, the analogue does not allow you to hide the location of the source of radio emission, which limits the scope of its application.

A device is known for the active radio masking of radio electronic means by active jamming stations (see Pat. RF No. 2632219, IPC H04K 3/00, publ. 03.10.2017, bull. No. 28). The analogue contains an active jamming station, a camouflaged electronic device, two interface and synchronization devices interconnected by intercom channels. The device provides an increase in the effectiveness of active radio masking of RES, elimination or significant difficulty in detecting emissions of both a masked RES and active jamming station, difficulty in determining their location. However, it is impossible to hide the location of the protected RES and EPS from modern geolocation systems (see Pat. 55700 US, GO IS 003/16. TDOA / FDOA technique for locating a transmitter / Desjardins GA, No. 138154; Filed Oct. 15, 1993; et al Oct. 29, 1996). Currently, the following standards and name servers are widely used: ISO 3166, FIPS, INSEE, GtoNames, etc.

The closest in technical essence is a radio masking device (see Pat. RF №2224376, IPC H04K 3/00, Н03В 29/00, publ. 02.20.2004, bull. No. 5). The radio masking device comprises a noise generator in series, a splitter into I, I buffer stages, an I-channel radio transmitter and a block of I antennas.

The device provides an increase in the effectiveness of radio masking by creating induced masking noise interference and the formation of an electromagnetic field in space. However, the prototype, as well as its analogues, has a common drawback: it protects only the information transmitted at the object. In this case, the determination of the coordinates of the object from the sources of radio emission does not cause difficulties.

The goal is to develop an active radio masking device for the location of the AP, making it difficult to determine its coordinates.

, выходы которого соединены с соответствующими управляющими входами I-канального радиопередатчика, I+1-ый информационный вход которого объединен с вторым информационным входом блока расчета мощности сигнала

, а группа входов блока расчета дистанции связи R_i является четвертой входной шиной устройства, предназначенной для задания координат ЗС (X,Y,Z)_ЗС и соседних выбранных спутников-ретрансляторов (X,Y,Z)_i.This goal is achieved by the fact that in the device of the active radio masking of the location of the earth station, containing a splitter, a block of buffer stages, an I-channel radio transmitter, i = 2, 3, ..., I, and a block of I antennas, directional antennas are used in the antenna block , each of which is connected to the corresponding output of the I-channel radio transmitter, and the group of control inputs of the directional antenna unit is the first input bus of the device, designed to orient the I directional antennas to the corresponding Suitable relay satellites, the pseudo-random sequence (CST), the outputs of which are connected to respective buffer stages control unit inputs intended for the delay of AP signals at predetermined CSTs each cascade quantity Δτ _i, control input CST is the third input bus device intended for setting the law of following a pseudo-random sequence, the information input of the splitter is combined with the I + 1-m information input of the I-channel radio transmitter and is the second input bus oh device, which receives the value of the working frequency band ΔF and the actual signals of the AP S (t), connected in series to the unit for calculating the communication distance R _i and the unit for calculating the signal power

the outputs of which are connected to the corresponding control inputs of the I-channel radio transmitter, I + the 1st information input of which is combined with the second information input of the signal power calculation unit

and the group of inputs of the unit for calculating the communication distance R _i is the fourth input bus of the device, designed to set the coordinates of the AP (X, Y, Z) of the _AP and neighboring selected satellite transponders (X, Y, Z) _i .

Moreover, the buffer cascade block contains I parallel cascades of sequentially connected decoder and controlled delay line, the information inputs of which are information inputs of the buffer cascade block, the control inputs of which are connected to the information inputs of the corresponding decoders.

The listed new set of essential features due to the introduction of new elements and relationships allows us to achieve the purpose of the invention: to develop a device for active radio masking of the location of the earth station, which makes it difficult to determine its coordinates.

The inventive objects are illustrated by drawings, which show:

in FIG. 1 is a diagram of a multisatellite satellite geolocation system (MSSG) when receiving signals of three CPs;

in FIG. 2 is a view of the cross-correlation function obtained by processing the signals of the main and adjacent (selected) CP;

in FIG. 3 is a view of the cross-correlation function obtained by processing the main signal (protected by the AP) and several shifted copies thereof;

in FIG. 4 - position lines obtained from the results of correlation analysis;

in FIG. 5 is an algorithm for generating signals in the direction of an adjacent satellite;

in FIG. 6 is a generalized block diagram of an active radio masking device for the location of an earth station;

in FIG. 7 is a block diagram of a block of buffer cascades;

in FIG. 8 is a generalized block diagram of an earth station;

in FIG. 9 - a variant of the radiation pattern in the horizontal (vertical) plane for the antenna VS VSAT;

in FIG. 10 is a block diagram of a digital implementation of the main elements of an active radio masking device for the location of an earth station.

At present, multisatellite geolocation systems using two or more CPs to determine the location of APs are widely used (see Fig. 1). For their functioning it is necessary to fulfill a number of requirements. The latter include: the presence of at least two additional CPs that have the same uplink frequencies, polarization of the antenna system and coverage area. In addition, the MSSGs require knowledge of the exact position of all CPs involved in positioning (see Elbert B. Radio Frequency Interference in Communications System. New York: Artech House Publishers, 2016 .-- 229 p.).

The multi-satellite architecture of the GPS for determining the location of APs involves the use of differential-ranging, differential-Doppler methods or their combinations (see Chan M. Application of a dual satellite geolocation system on locating sweeping interference // World Academy of Science, Engineering Technology. - 2012. T 6, No. 9. - p. 1029-1034). In this case, CP1 (Fig. 1) will be the “main” CP, since it provides relaying of the signal along the main lobe of the radiation pattern. The second and third CPs are adjacent, are located at some distance from CP1 and are capable of transmitting the same radiation received from the side lobes of the CS LC, but with a large attenuation and with a different transfer frequency. As a result of correlation processing, the difference between the paths of signal paths through the main and adjacent CPs and the corresponding time delay of the signal Δt

where c is the speed of light.

Otherwise, the expression (1) can be written through the coordinates of the location of the AP, CP and MSSG

where (x _{AP, AP} y, z _ES) (x _{CP1, CP1} y, z _CP1), (x _{MSSG, MSSG} y, z _MSSG) - AP coordinates, respectively, CP1, CP2 and MSSG. According to equations (1) or (2), a position line (hyperbola) is drawn on the Earth’s surface, passing through the coordinates of the Earth. In FIG. 2 shows the value of the VKF of the signals of the main and adjacent CPs, and the value of the delay time is determined by the position of the maximum of the presented function. To determine the location of the satellite, it is necessary and sufficient to use another CP in the geostationary orbit, with the help of which one more line of position is obtained. The intersection point of the position lines gives the location coordinates of the AP.

In FIG. Figure 2 shows the results of processing the records of signals obtained as a result of a communication session with the known coordinates of the main (Yamal 202) and one adjacent (Express AM7) CP at a frequency of 3936 MHz. The Y axis represents the value of the normalized correlation coefficient to the average noise level in the emission band, and the X axis represents the mutual time delay of the signals. The correlation function has one maximum corresponding to the difference in the signal path of the ES.

The essence of the proposed method consists in the fact that in the VKF obtained at the MSSG to form a set of additional (false) equivalent maxima that make it difficult to choose the true one. To do this, it is proposed to simultaneously emit time-shifted copies of this signal, coordinated in distance to the CP power, in the direction of the selected (adjacent) satellites along with the main signal of the ES. The latter should be limited in comparison with the main signal of the ES, since they simulate spurious emissions. On the other hand, they should exceed the level of the spurious emissions of the ES itself.

Information about the coordinates of the ES (X, Y, Z) of the _AP and the i-th CP [X, Y, Z) _i allows you to determine the direction (azimuth θ _i and elevation angle β _i ) from the earth station to the i-th CP in the local tangent system coordinate (ENU - East north up), where the X axis is east, the Y axis is north and the Z axis is up. It is believed that the coordinates of the AP in it are equal to (0,0,0) _AP , and the ith CP is found from the expression

where α is the geocentric or geodetic longitude (they are equal) ZS, which is defined as

and ϕ is the geodesic latitude of the ES, which differs from the geocentric latitude ϕ '.

Geocentric and geodetic latitudes are related by the following expression

, ƒ - сжатие земного эллипсоида

е - эксцентриситет земного эллипсоида

а - большая полуось земного эллипсоида,

- геодезическая высота. Для вычисления геодезических координат CP используют итеративный метод Боуринга. После нахождения координат i-го CP в локальной касательной системе координат определяют на него направление с земной станцииwhere M (ϕ) is the radius of curvature of the first vertical

, ƒ - compression of the earth ellipsoid

e - eccentricity of the earth ellipsoid

and - the semimajor axis of the earth's ellipsoid,

- geodetic height. To calculate the geodetic coordinates of CP, the iterative Bowring method is used. After finding the coordinates of the ith CP in the local tangent coordinate system, the direction from the earth station is determined on it

The signal power required for radiation emitted in the direction of neighboring (selected) CPs is determined from the expression

- коэффициент усиления передающей антенны; P_t - коэффициент усиления приемной антенны;

- мощность сигнала в передающей антенне (Вт) без учета потерь; G_t - мощность сигнала, принимаемая антенной (Вт) без учета потерь; R - расстояние между антеннами ЗС и CP в метрах; λ - длина волны сигнала в метрах. Зная

, P_t, λ, R, заданное значение

можно определить необходимую излучаемую мощность сигнала

на каждый соседний i-тый CPWhere

- gain of the transmitting antenna; P _t is the gain of the receiving antenna;

- signal power in the transmitting antenna (W) without taking into account losses; G _t is the signal power received by the antenna (W) without taking into account losses; R is the distance between the AP and CP antennas in meters; λ is the wavelength of the signal in meters. Knowing

, P _t , λ, R, setpoint

you can determine the required radiated signal power

for each neighboring i-th CP

To do this, the distance between the AP and the i-th CP is determined using the well-known expression

At present, small-sized APs are widely used, for example, in the VSAT (Very Small Aperture Terminal) CCC (see Ovcharenko K.L., Eremeev I.Yu., Sazonov K.V. et al. Difference-ranging method for determining the location of earth stations satellite communication systems using a repeater on an unmanned aerial vehicle // Transactions of SPIIRAS. - 2018. - T. 18, No. 1. - P. 176-201). They are characterized by relatively small antenna dimensions (up to 1.8 m) and narrow radiation patterns (LH), the width of the main lobe of which does not exceed several degrees. The level of the side lobes of the DN is significantly limited and is determined by the following expression

A variant of the MD in the horizontal (vertical) planes for the AP VSAT antenna is shown in FIG. nine.

As a result of receiving a combination of emissions from the main and adjacent CPs on the MSSG, their cross-correlation function takes the form shown in FIG. 3. Based on the measured time delays, position lines are constructed based on correlation processing (Fig. 4).

Using a random delay between copies of the main signal as the generated interference leads to random path differences between the signals received from CP2 and CP3, and, accordingly, to displacement of the position lines relative to the true ones. The result is a set of coordinates of the location of the AP, which significantly reduces the efficiency of the MSSG. The experiment confirmed the effectiveness of the proposed method of masking the coordinates of the AP.

Based on the foregoing, we can distinguish the following sequence of operations. At the preparatory stage:

1. Allocate CP adjacent to the used AP, which can be used by the MSSG in the process of geolocation of the AP.

2. Determine the direction from ES to I selected CP (θ, β) _i , θ = 1 °, 2 °, ..., 360 °; β = 1 °, 2 °, ..., 180 °; i = 2, 3, ..., I. Orient the additional antennas in the direction of the corresponding CPs (expressions 6 and 7).

3. Calculate the removal of the selected CP from the ES in accordance with (10).

4. Set the level of spurious emissions of the AP antenna in the direction of the corresponding CP

в направлении каждого i-го CP в соответствии с (9),

5. Determine the required power of the interfering signal

in the direction of each i-th CP in accordance with (9),

6. Determine the boundary values of the delay signal ZS Δt _min and Δt _max during the formation of masking interference and the value of the time samples δ _t .

In progress:

1. Form the SRP, which determines the delay of the signal of the AP for each i-th CP within the specified boundary limits.

2. An individual interfering signal is generated for each i-th CP on the basis of ES emissions, which is delayed according to the pseudo-random law with power adapted for each CP.

8, выходы которого соединены с соответствующими управляющими входами I-канального радиопередатчика 4, I+1-й информационный вход которого объединен со вторым информационным входом блока расчета мощности сигнала

8, а группа входов блока расчета дистанции связи R_i 9 является четвертой входной шиной 11 устройства, предназначенной для задания координат ЗС (X,Y,Z)_ЗС и соседних выбранных спутников-ретрансляторов (X,Y,Z)_i. При этом блок буферных каскадов 3 содержит I-параллельных каскадов из последовательно соединенных дешифратора 12.i и управляемой линии задержки 13.i, информационные входы которых являются информационными входами блока буферных каскадов 3, входы управления которого соединены с информационными входами соответствующих дешифраторов 12.i.The device for active radio masking of the location of the earth station (see Figs. 6 and 7) includes a coupler splitter 2, a block of buffer cascades 3, designed to delay the ES signals by a given value Δτ _i , I-channel radio transmitter 4, block of directional antennas 5 , each of the antennas of which is connected to the corresponding output of the I-channel radio transmitter 4, and the group of control inputs of the block of directional antennas 5 is the first input bus 1 of the device intended for orientation of I directional antennas nn 5 to the respective relay satellites, a pseudo-random sequence generator 7, the outputs of which are connected to the corresponding control inputs of the buffer cascade unit 3, the GPS control input 7 is the third input bus 10 of the device, designed to set the pseudo-random sequence, the information input of the splitter 2 is combined with I + 1-m information input of the I-channel radio transmitter 4 and is the second input bus 6 of the device, which often receives the value of the working band ΔF and the actual S (t) signals LC serially connected communication distance calculation unit 9 R _i and signal power calculation unit

8, the outputs of which are connected to the corresponding control inputs of the I-channel radio transmitter 4, I + the 1st information input of which is combined with the second information input of the signal power calculation unit

8, and the group of inputs of the unit for calculating the communication distance R _i 9 is the fourth input bus 11 of the device, designed to set the coordinates of the AP (X, Y, Z) of the _AP and neighboring selected satellite transponders (X, Y, Z) _i . At the same time, the buffer cascade block 3 contains I-parallel cascades of sequentially connected decoder 12.i and a controlled delay line 13.i, the information inputs of which are information inputs of the buffer cascade block 3, the control inputs of which are connected to the information inputs of the corresponding decoders 12.i.

The work of the proposed device is as follows. At the preparatory stage, satellite-transponders adjacent to the used AP are determined, which can be used by the CCG to determine the location of the protected AP. After selecting I CP, their coordinates (X, Y, Z) _i on the fourth input bus 11 are input to the unit for calculating the communication distance R _i 9. In addition, the bus 11 is used to set the coordinates of the ZS (X, Y, Z) _{ZS itself} . The direction from the ES to I of the selected satellite transponders (θ, β) _i in the horizontal θ and vertical β regions is determined.

In the block of buffer cascades 3, on a constant basis, the boundary values of the delay of the ES signals Δt _min and Δt _max and the value of the time samples δ _t in this interval are set. The performed experiments indicate that a reasonable delay interval for the ES signals is 10 ns ... 1 ms in steps of 10 ns.

8 на постоянной основе фиксируют средний уровень боковых излучений

и задают значение необходимой мощности сигнала в приемной антенне выбранных спутников-ретрансляторов

Для того, чтобы ССГ было принято решение об успешной геолокации ложной цели, необходимо превышение ложного пика ВКФ над истинным на случайное значение от 10 до 50%

The third input bus 10 sets the pseudo-random sequence law generated by block 7. The latter determines (in block 3) the delay value of the CC signal for each i-th selected CP at discrete time instants δ _t ⋅j, j = 1, 2, ..., J , δ _t ⋅J time interval of active radio masking. In the power calculation unit

8 permanently record the average level of side emissions

and set the value of the required signal power in the receiving antenna of the selected satellite transponders

In order for SSG to make a decision on the successful geolocation of a false target, it is necessary that the false peak of the VKF exceeds the true peak by a random value from 10 to 50%

для выбранных СР.In addition, information on its working frequency band in the L wavelength range of 950-2150 MHz is received from the AP output via the second input bus 6 of the device. The latter can be from 5 kHz to 10 MHz. This information is used in block 4 to configure the I channels of the transmitters. In block 8, it is necessary to calculate the required power of the interfering signals

for selected CP.

In the process of operation of the active radio masking device, the signals SZ S (t) are fed to the second input bus 6 of the device. In FIG. Figure 8 shows a simplified block diagram of the ES. It contains serially connected satellite modems 17, an adder 14, an up-converter 15, a power amplifier 16, a main antenna system 18, a low-noise amplifier 21, a down converter 20, a divider 19, the outputs of which are connected to the second information inputs of the satellite modems 17, the first group of information inputs is the control bus of the AP (see V. Bobkov. Earth satellite communications stations // CONNECT, No. 2, 2007, p. 148-151). Structurally, the elements of the station can be combined. The ZS signal to the inventive device (on bus 6) comes from the transceiver of the station, which usually combines an up and down frequency converter and a low-noise amplifier. In block 2 carry out their additional amplification and branching (division) into I identical channels. The ES signal from the I outputs of block 2 simultaneously arrives at the I information inputs of the buffer cascade block 3. The I control inputs of block 3 are supplied with different values of the pseudo-random sequence from the corresponding outputs of the GPS 7. The latter can be a set of I m-sequence generators of a given lengths or one shaper. In this case, the SRP values arrive at the I outputs of block 7 with some mutual time shifts nδ _t , n = 1, 2, ..., n, ..., N.

In the block of buffer cascades 3, the current values of the SRP received at the I control inputs from block 7 are converted to the corresponding values of the delay signal ZS. As a result, at the I outputs of block 3 there are AC signals delayed at various time intervals. The latter arrive at the corresponding information inputs of the I-channel radio transmitter 4.

8. В блоке 8 в соответствии с (9) определяют необходимую для излучения мощность задержанного в блоке 3 сигнала ЗС

для каждого i-го выделенного СР. Необходимая информация о частоте сигнала ЗС в блок 8 поступает на второй информационный вход с выхода I-канального радиопередатчика 4. Полученные в блоке 8 значения

для каждого i-го канала преобразуют в соответствующие коэффициенты усиления, которые поступают на управляющие входы блока 4.Simultaneously with performing the above operations in the unit for calculating the communication distance R _i 9, based on the initial data on the location of the AP (X, Y, Z) _AP and CP (X, Y, Z) _i, in accordance with (10), their mutual distances R _i . The found values of R _i are supplied to the information inputs of the signal power calculation unit

8. In block 8, in accordance with (9), the power required for radiation delayed in block 3 of the signal ЗС is determined

for each i-th selected SR. The necessary information about the frequency of the AP signal in block 8 is fed to the second information input from the output of the I-channel radio transmitter 4. The values obtained in block 8

for each i-th channel, they are converted into the corresponding gain factors, which are fed to the control inputs of block 4.

Further, the ES signals amplified in block 4 are fed to the inputs of the directional antennas of block 5 and are emitted in the direction of the selected SRs. In this case, the directions of emission of the signals of the CS and their power are optimized with the spatial position of the SR grouping.

The implementation of the device is known and does not cause difficulties. Splitter 2 is a series-connected power amplifier and a high-frequency splitter proper to I. Its function is to generate identical copies of the ES signal at its I outputs I with an amplitude suitable for normal operation of unit 3. As the last, a PROconect 3- product can be used WAY SPLITER and AD8351 ARM2 amplifier from Analog Devices Inc.

The buffer cascade block 3 contains I parallel cascades of sequentially connected decoder 12.i and a controlled delay line 13.i. The functions of block 3 include delaying the signals of the ES for various time intervals, the values of which are set by block 7. The implementation of decoders and controlled delay lines of analog signals is widely covered in the literature. The latter can be performed based on the NC12111c-106 six-bit controlled delay line.

The I-channel radio transmitter 4 provides the final generation of interfering signals to the selected CPs, optimized for delay and amplitude, converting the operating frequency of the ES "up" (for example, into C or Ku wave bands) with subsequent amplification. For this purpose, commercially available products SSPBM-KX16-DSE-HU1, SSPBMg-CX20-DSE-HU1, etc. can be used.

The implementation of blocks 8 and 9 is known and does not cause difficulties. Their functions include settlement operations in accordance with expressions 9 and 10 (see Shevkoplyas B.V. Microprocessor structures. Engineering solutions: Handbook. - 2nd ed. Revised and enlarged. - M.: Radio communication, 1990. - 512 from.).

The implementation of the pseudo-random sequence generator 7 is known (see ibid., Pp. 492-497).

Thus, the proposed method and device for active radio masking of the location of the CCC earth station does not imply changes to the algorithm of its operation, but is implemented as additional equipment.

The implementation of the proposed device is greatly simplified when processing the signals of the AP in digital form. In this case, the functions of blocks 2, 3 and 7-9 and partially 4 are performed according to the circuit shown in FIG. 10. Two AD9361 2x2 transceivers with integrated 12-bit DAC-ADC, Xil-inx Kintex 7 FPGA (XC7K325T-2FFG900C) and a digital signal processor TMS320TC166 14 (2GB DDR3 RAM, 1 Mb NOR Flash) are used here. After the digital-to-analog conversion to AD9361, the AP signals are sent to the SSPBM-KX16-DSE-H01 or SSPMg-CX20-DSE-H01 block depending on the used wavelength range and then to the directional antennas of block 5.

Claims (3)

1. The method of active radio masking of the signals of the earth station (AP) satellite communication system (CCC), which consists in the fact that the masking is carried out by radiation, relay noise interference or imitating and false signals, paired and synchronized with the signals of the AP, characterized in that in the preparatory stage, I isolate the satellites-repeaters (CPs) adjacent to them, i = 2, 3, ... I, having the same uplink frequencies, polarization of the antenna system and coverage area, determine the coordinates of the AP (X, Y, Z) of the _AP and selected CP (X, Y, Z) _i , direction (θ, β) _i to the selected CPs, calculate the distance between the ES and the relay satellites, determine the values

required for radiation power of the interfering signal in the direction of each of the selected i-satellite transponders, i = 2, 3, ... I, and the CCC CCS are additionally equipped with I directional antennas, which are oriented in the direction of the respective satellite transponders, and I-channel coherent radio transmitter, and as an active masking noise in I additional channels, the radio transmitter - directional antenna uses excellent interconnected pseudo-random law and optimized in power

AP signals. 2. An active radio masking device for signals from an earth station (AP), comprising a splitter, a block of buffer stages, an I-channel radio transmitter, i = 2, 3, ... I, and a block of I antennas, characterized in that directional antennas are used antennas, each of which is connected to the corresponding output of the I-channel radio transmitter, and the group of control inputs of the directional antenna unit is the first input bus of the device, designed to orient I directional antennas to the corresponding relay satellites lasers, a pseudo-random sequence generator (GPS), the outputs of which are connected to the corresponding control inputs of the buffer cascade unit, designed to delay the signals of the GC to a given GPS value for each cascade Δτ _i value, the GPS control input is the third input bus of the device, designed to set the pseudo-random sequence , the information input of the splitter is combined with the I + 1-m information input of the I-channel radio transmitter and is the second input bus of the device, according to which the swarm receives the value of the working frequency band ΔF and the actual signals of the AP S (t) connected in series to the unit for calculating the communication distance R _i and the unit for calculating the signal power

the group of outputs of which is connected to the corresponding control inputs of the I-channel radio transmitter, I + 1-st information input of which is combined with the second information input of the signal power calculation unit

and the group of inputs of the unit for calculating the communication distance R _i is the fourth input bus of the device, designed to set the coordinates of the AP (X, Y, Z) of the _AP and neighboring selected satellite transponders (X, Y, Z) _i . 3. The device according to claim 2, characterized in that the buffer cascade block is made up of I parallel cascades of sequentially connected decoder and a controlled delay line, the information inputs of which are information inputs of the buffer cascade block, the control inputs of which are connected to the information inputs of the corresponding decoders.

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