RU2564535C1 - Unauthorised duplex space communication channel radio suppression system - Google Patents

Abstract

FIELD: radio engineering, communication.

SUBSTANCE: unauthorised duplex space communication channel radio suppression system comprises, including, the ground transceiving terminal comprising the unauthorised channel radio signal source, tropospheric transceiving station and transceiving station.

EFFECT: increase of efficiency and rate of radio suppression of unauthorised duplex space communication channels without use of onboard repeaters.

1 dwg

Description

The invention relates to the field of radio engineering and can be used for selective radio suppression of unauthorized duplex communication channels of space systems, in particular for radio suppression of duplex channels of "pirate" terminals operating in satellite communication networks and using their frequency and energy resources.

In connection with the growth of satellite systems, the volume of services provided to users is expanding significantly, and the unauthorized operation of “pirate” terminals leads to significant losses for operators and users of space systems [1].

The prior art system for suppressing duplex communication channels of “pirate” terminals of a cellular network using a base station. This provides radio suppression of unauthorized channels of “pirated” terminals with a structure that complies with the standard for the cellular network (see the patent of the Russian Federation for the invention RU 2149512 of 04/04/1999, Н04К 3/00, publ. 05.20.2000).

The system includes a transceiver of unauthorized duplex communication channels, as well as a transceiver base station of a cellular network containing equipment for the detection and analysis of parameters of radio signals of duplex channels, an information processing unit, an jammer, and an interference transmitter. Interference parameters are set using the dedicated overhead information of the cellular network. At the same time, the system provides selective radio suppression of duplex communication channels, the structure of which is known and corresponds to the network functioning protocol.

The disadvantage of the system is that there is no possibility of radio suppression of unauthorized duplex communication channels of space systems with an arbitrary structure.

The prior art system for suppressing duplex channels of “pirate” terminals operating in satellite communication networks in accordance with the network operation protocol using an on-board relay and a ground-based base transceiver station for analyzing channel relayed radio signals and generating interference [1].

The disadvantage of this system is the need to carry out onboard the spacecraft a linear relay of the radio signals of duplex channels with radiation to the base transceiver station for their analysis and generation of interference, which leads to an increase in time delays in determining the parameters of radio signals and in the formation of interference. Since linear repeaters are used only in communication systems, the application of the known method is functionally limited.

The technical result of the claimed invention is to increase the efficiency and speed of radio suppression of unauthorized duplex space communication channels without the use of airborne transponders.

The technical result of the claimed invention is achieved by the fact that the radio suppression system of an unauthorized duplex space communication channel includes:

- a ground transmitting and receiving terminal including an unauthorized channel radio signal source, a receiver and a transmitting and receiving antenna emitting at an frequency f ₁ an unauthorized channel radio signal in the direction of the spacecraft through a local area of the troposphere with intense dispersion of an unauthorized channel radio signal and providing an unauthorized channel radio signal reception at a frequency f ₂ emitted by the spacecraft in the direction of the ground transceiver terminal through the local an area of the troposphere with intense dispersion of the radio signal of the unauthorized channel, and the output of the radio signal source of the unauthorized channel and the input of the receiver, respectively, through a duplexer are connected to the transceiver antenna;

- a tropospheric transceiver station, which includes a series-connected jammer and an interference transmitter tuned to a radiation frequency f ₂ of the spacecraft, as well as a series-connected receiver of an unauthorized channel reflected from a local region of the troposphere, tuned to a radiation frequency f ₁ terrestrial transceiver terminal, and a processing device that emits the parameters of the intense scattering reflected from the local region of the troposphere receive an unauthorized channel radio signal, the output of the interference transmitter and the input of the receiver reflected from the local region of the troposphere with intense dispersion of the radio signal of the unauthorized channel through a duplexer are connected to the transmit-receive antenna of the troposphere transmit-transmit station, respectively, pointing to the local region of the troposphere with intense dispersion of the transmit-transmit radio signal station

- a transceiver station, which includes a series-connected device for generating interference and an interference transmitter, the frequency of which is set in accordance with the frequency f _{1 of the} radiation source of the radio signal of an unauthorized channel, and a series-connected receiver tuned to the frequency f _{2 of the} radiation of the spacecraft, and the processing device releasing a radio channel parameters unauthorized emitted by the spacecraft at a frequency f _2, the output of jamming transmitter input and receiver Jun of the duplexer are connected respectively to the transmission-reception antenna transceiver station induced on the spacecraft;

- in this case, one output of the processing device, which selects the parameters of the troposphere receiving-transmitting station reflected from the local area of the troposphere with intense dispersion of the radio signal of the unauthorized channel, is connected via a communication line to the input of the jammer of the transmitter-receiver station, and the second output to the control input of the transmitter-receiver interference transmitting station, and one output of the processing device that selects parameters reflected from the local area of the troposphere with intense dispersion of the radio signal of unauthorized nnogo channel transceiver station, coupled to the input of noise shaper tropospheric transceiver station, the second output - to the control input of the transmitter interference tropospheric transceiver station.

The features and essence of the claimed invention are explained in the following detailed description, illustrated by the drawing.

In FIG. 1 is a diagram of a radio suppression system of unauthorized duplex space communication channels, where the following is shown:

- space radio link duplex;

- ground transmitting and receiving terminal (NPPT);

- transceiver antenna NPPT;

- duplexer NPPT;

- receiver NIPT;

- a radio signal source of an unauthorized channel NIPT;

- a local region of the troposphere with intense dispersion of the radio signal of an unauthorized channel;

- spacecraft;

- tropospheric receiving and transmitting station (TPPS);

- transceiver antenna TPPS;

- duplexer TPPS;

- TPPS receiver;

- transmitter TPPS;

- a processing device that selects parameters of the reflected radio signal of an unauthorized channel;

- TPSS jammer;

- transceiver stations (PPS);

- PPP antenna;

- duplexer PPS;

- PPP receiver;

- transmitter interference PPP;

- a processing device that selects the parameters of the radio signal of an unauthorized duplex channel emitted by the spacecraft;

- PPP jammer.

The radio suppression system of an unauthorized duplex space communication channel operates as follows.

The transceiver antenna (3) of the ground transceiver terminal (2) emits an unauthorized channel radio signal S ₁ (t) with a carrier frequency f ₁ in the direction of the spacecraft (3). When propagating in the troposphere, the radio signal S ₁ (t) of an unauthorized channel passes through a medium with a local region (7) of intense scattering in the troposphere. As a result of scattering, a radio signal S ₀ (t) of an unauthorized channel reflected from the local region (7) of intense scattering in the troposphere is formed. When the transceiver antenna (10) of the tropospheric transceiver station (9) is pointed at the local region (7) of intense scattering in the troposphere, the signal S ₀ (t) of the unauthorized channel reflected from the local region (7) is received by the transceiver antenna (10) tropospheric receiving and transmitting station and enters through the duplexer (11) to the input of the receiver (12) of the tropospheric receiving and transmitting station (9) tuned to the carrier frequency f ₁ . The received reflected radio signal S ₀ (t) of the unauthorized channel after frequency conversion and filtering in the receiver (12) is supplied to the processing device (14), which selects the parameters of the unauthorized channel radio signal reflected from the local region of the troposphere. The processing device (14), which selects the parameters of the troposphere reflected from the local region with intense dispersion of the radio signal of the unauthorized channel, has two outputs, on one of them connected to the control input of the interference transmitter (20) of the transceiver station (16), the parameters B ₁ (t) moments of the beginning and end of radiation and the value of the carrier frequency f ₁ reflected from the local region of the troposphere with intense scattering of the radio signal S ₀ (t) of the unauthorized channel, and modulating parameter is allocated at the other output In ₂ (t) reflected from the local region of the troposphere with intense dispersion of the radio signal of an unauthorized channel, fed to the input of the jammer (22) of the transceiver station (16), the output of which is connected to the modulating input of the interference transmitter (20). The interfering radio signal generated in the interference transmitter (20) enters through the duplexer to the transmit-receive antenna (16) and is radiated in the direction to the spacecraft (8). Thus, at the input of the spacecraft there is a radio signal from an unauthorized channel of the ground transceiver terminal (2) and an interfering radio signal synchronized with a minimum time delay relative to the radiation time of the radio signal from the ground transceiver terminal (2). Due to the increased level of power emitted by the transceiver station (16), the level of the jamming radio signal at the input of the spacecraft (8) is exceeded in relation to the level of the radio signal of the unauthorized channel emitted by the ground transceiver terminal (2). The increased efficiency of suppressing the radio signal of an unauthorized channel is also ensured by the minimum time delay between the interfering radio signal and the radio signal emitted by the ground receiving and transmitting terminal (2), as well as by matching the modulating parameters of the interfering radio signal and the radio signal of the unauthorized channel.

In duplex communication mode, the spacecraft (8) emits a radio signal S ₂ (t) of the duplex unauthorized channel in the direction of the ground transceiver terminal (2) at a frequency f ₂ . The radio signal S ₂ (t) emitted by the spacecraft from the duplex unauthorized channel is transmitted to the transmit-receive antenna (3) of the ground transmit-receive terminal (2) through the local area (7) of the troposphere with intense dispersion of the radio signal from the duplex unauthorized channel, as well as to the transmit-receive the antenna (17) of the transceiver station (16). The received radio signal from the transmitting and receiving antenna (17) through a series-connected duplexer (18) and a receiver (19) is fed to a processing device (21) that selects the radio signal of the duplex unauthorized channel emitted by the spacecraft (8). The processing device (21), which selects the radio signal parameters of the duplex unauthorized channel, has two outputs, on one of them connected to the control input of the interference transmitter (13) of the tropospheric transceiver station (9), the parameters A ₁ (t) of the start times and the end of the spacecraft radiation and the value of the frequency f _{2 of the} radio signal of the duplex unauthorized channel, and at the other output, the modulating parameters A ₂ (t) of the radio signal of the duplex unauthorized channel that are input to the tropospheric interference former (15) are allocated transceiver station (9), the output of which is connected to the modulating input of the interference transmitter (13) of the tropospheric transceiver station (9). Formed at the transmitter interference (13) tropospheric transceiver station (9) interfering radio signal passes through the duplexer (11) for receiving and transmitting antenna (10) which emits interfering radio signal _P2 (t) in the direction of the local region of the troposphere (7) with intense dispersion of the radio signal of an unauthorized channel, where a reflected interference radio signal P ₀ (t) is generated in the direction of the ground transceiver terminal (2). As a result, in the direction of the ground transceiver terminal (2), along with the duplex channel signal emitted by the spacecraft (8), there is a reflected jamming radio signal P ₀ (t) arising from the radiation of the tropospheric transceiver station (9). To increase the efficiency of the radio suppression system, the parameters of the interfering radio signal emitted by the tropospheric receiving and transmitting station (9) are consistent with the parameters of the radio signal of an unauthorized duplex channel emitted by the spacecraft (8).

Thus, at the input of the ground transceiver terminal (2) there is a radio signal of an unauthorized duplex channel emitted by the spacecraft, and a reflected synchronized jamming radio signal P ₀ (t) with a minimum time delay relative to the radiation time of the spacecraft radio signal (8) and with matched modulating parameters of the radio signal of a duplex unauthorized channel emitted by a spacecraft (8). Due to the increased power level of the radio signal emitted by the tropospheric transceiver station (9), the level of the interfering radio signal at the input of the spacecraft (8) is exceeded in relation to the level of the radio signal of the unauthorized channel emitted by the spacecraft (8).

In the claimed system, the value of the minimum time delay T _{3 of} interfering radio signals in the duplex channels emitted by the tropospheric transceiver station (9) and the transceiver station (16), relative to the radio signals of unauthorized duplex channels emitted by the spacecraft (8) and the ground transceiver terminal (2), is determined by the distance D from the tropospheric transceiver station (9) to the local region of the troposphere (7) with intense dispersion of the radio signal of an unauthorized channel and can be found on according to the formula:

T ₃ = D / s, (1)

where c is the speed of light.

At D = 300 km, the time delay for unauthorized duplex channels in the claimed system will be 1 ms. In the known radio suppression systems of unauthorized duplex channels, the minimum time delay is determined by the propagation time of the signal from the spacecraft in a stationary orbit to the Earth, which is 125 ms, i.e. in the claimed system, the amount of time delay for each unauthorized duplex channel is 100 times less than in the known ones.

The radio jamming efficiency of the duplex unauthorized channel emitted by the spacecraft (8) in the direction of the ground transceiver terminal (2) can be determined by the ratio of the power of the unauthorized channel of the interfering signal P ₀ (t) reflected from the local region of the troposphere to the radio signal power unauthorized channel emitted by the spacecraft (8), and calculated by the formula:

P _s / P _s = P _s-b (dB) + S _s-b (dB) + L _s-b (dB) - L _neg (dB), (2)

Where

P _s-b is the ratio of the power of the interference transmitter (13) of the tropospheric transceiver station (9) and the signal of the onboard transmitter of the spacecraft (8);

S _z-b is the ratio of the effective areas of the transceiver antennas of the tropospheric transceiver station (9) and the spacecraft (8);

L _s-b is the ratio of the squares of the distances to the local region of the troposphere (7) with intense dispersion of the radio signal of the unauthorized channel from the spacecraft (8) and from the tropospheric transceiver station (9);

L _neg - reflection loss in the local region of the troposphere (7) of intense scattering of the radio signal of an unauthorized channel.

When P _s-b = 30 dB, S _s-b = 30 dB, L _s-b = 20 dB, L _sp = 50 dB, the ratio of the power reflected from the local region of the troposphere with intense dispersion of the radio signal of the unauthorized duplex channel of the interfering radio signal P ₀ (t ) to the power of the radio signal of an unauthorized duplex channel emitted by the spacecraft is equal to: R _p / R _s = 30dB, which provides full radio suppression of the unauthorized duplex channel emitted by the spacecraft in the direction of the ground transceiver terminal.

The claimed system provides radio suppression of unauthorized duplex channels organized between the spacecraft and the ground transceiver terminal, using two transceiver stations: a transceiver tropospheric station, which uses the effect of the occurrence of reflected in the local area of the troposphere with intense dispersion of radio signals of unauthorized duplex channels, as well as a transceiver station, receiving radio signals of unauthorized dupes eksnyh channels emitted by the spacecraft, and the radiation noise to unauthorized radio channel emitted by the terrestrial transceiver terminal.

To implement the invention, a typical tropospheric transmitting and transmitting station and a typical space communication transmitting and transmitting station operating in the frequency range of duplex channels can be applied. In this case, the antenna of the tropospheric receiving and transmitting station should be pointed at the local area of intense dispersion of signals of unauthorized duplex channels, and the antenna of the receiving and transmitting station should be directed at the spacecraft.

Sources of information taken into account

1. Special issue. “Satellite communications and broadcasting”, 2009 - [1].

Claims (1)

The radio suppression system of an unauthorized duplex space communication channel includes:
- a ground transmitting and receiving terminal including an unauthorized channel radio signal source, a receiver and a transmitting and receiving antenna emitting at an frequency f ₁ an unauthorized channel radio signal in the direction of the spacecraft through a local area of the troposphere with intense dispersion of an unauthorized channel radio signal and providing an unauthorized channel radio signal reception at a frequency f ₂ emitted by the spacecraft in the direction of the ground transceiver terminal through the local an area of the troposphere with intense dispersion of the radio signal of the unauthorized channel, and the output of the radio signal source of the unauthorized channel and the input of the receiver, respectively, through a duplexer are connected to the transceiver antenna;
- a tropospheric transceiver station, which includes a series-connected jammer and an interference transmitter tuned to a radiation frequency f ₂ of the spacecraft, as well as a series-connected receiver of an unauthorized channel reflected from a local region of the troposphere, tuned to a radiation frequency f ₁ terrestrial transceiver terminal, and a processing device that emits the parameters of the intense scattering reflected from the local region of the troposphere receive an unauthorized channel radio signal, the output of the interference transmitter and the input of the receiver reflected from the local region of the troposphere with intense dispersion of the radio signal of the unauthorized channel through a duplexer are connected to the transmit-receive antenna of the troposphere transmit-transmit station, respectively, pointing to the local region of the troposphere with intense dispersion of the transmit-transmit radio signal station
- a transceiver station, which includes a series-connected device for generating interference and an interference transmitter, the frequency of which is set in accordance with the frequency f _{1 of the} radiation source of the radio signal of an unauthorized channel, and a series-connected receiver tuned to the frequency f _{2 of the} radiation of the spacecraft, and the processing device releasing a radio channel parameters unauthorized emitted by the spacecraft at a frequency f _2, the output of jamming transmitter input and receiver Jun of the duplexer are connected respectively to the transmission-reception antenna transceiver station induced on the spacecraft;
at the same time, one output of the processing device that selects the parameters of the troposphere receiving-transmitting station reflected from the local region of the troposphere with intense dispersion of the radio signal from the unauthorized channel is connected via a communication line to the input of the jammer of the transmitter-receiver station, and the second output is connected to the control input of the transmitter-receiver interference station, and one output of the processing device that selects the parameters reflected from the local area of the troposphere with intense dispersion of the radio signal of unauthorized nnogo channel transceiver station, coupled to the input of noise shaper tropospheric transceiver station, the second output - to the control input of the transmitter interference tropospheric transceiver station.