RU2462751C2 - Multifunctional system for reception, demodulation and processing of communication line signals - Google Patents

Abstract

FIELD: information technologies.

SUBSTANCE: multifunctional system for reception, demodulation and processing of a wide circle of communication line signals, comprises the following serially connected components: an antenna with a drive and a homing and autofollow system, a low noise amplifier with a frequency converter, a multichannel digital receiving-demodulating device with a PU decoder, a descrambler and a deinterlacer, and also a PC of control and interaction and a set of demultiplexers built on the PC base.

EFFECT: expansion of functional capabilities due to provision of a function of noise-resistant decoding, descrambling, deinterlacing.

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Description

The invention relates to the field of radio engineering and digital technology and can be used in communication systems for receiving, demodulating and processing a wide class of signals with a complex modulation structure, noise-resistant (PU) coding, scrambling, interleaving and multiplexing.

A number of systems are known ([1] Patent No. 2224373 of 02.20.2004, “Station of technical control of communication lines”, [2] Patent No. 2239287 of October 27, 2004 of “Station of technical control of communication lines”), providing electromagnetic and information access to a narrow circle of signals of communication lines.

The disadvantage of these stations is the ability to work on a narrow range of signals and low bandwidth, as well as the absence of PU devices for decoding, descrambling, deinterleaving in these stations, while in existing communication systems these transformations over the signal take place, which ensures high noise immunity and high connection quality.

Also known is a system ([3] Patent No. 2224375 of 02.20.2004, “Multifunctional system for receiving, demodulating and processing signals of I-IV levels of hierarchical multiplexing”), taken as a prototype and containing a series-connected antenna with a drive and a guidance system, a reception filter , low-noise amplifier (LNA), high-frequency pre-amplifier, power divider, k - radio receivers, intermediate frequency switch, the outputs of which are connected to the n-paths of demodulation and processing as part of, sequentially connected, dem undulator, the demultiplexer level IV, the demultiplexer III level, level II demultiplexer, the demultiplexer I level, and a PC with a monitor and keyboard, which outputs are connected to inputs of all devices in the system.

The disadvantage of the prototype is its complexity, the ability to work only according to standard CCITT recommendations, the absence of decoders, descramblers, de-interleavers in the control system, as well as the need to use expensive functional modules (in particular demultiplexers).

The aim of the invention is to simplify the system, expand the functionality and maximize the use of computer technology.

To achieve this goal, a system is proposed that contains an antenna with a drive and guidance and auto tracking system and an LNA with a frequency converter, as well as a control and interaction PC, the outputs of which are connected to control inputs of a drive with a guidance and automatic tracking system and LNA with a frequency converter, into which introduced a multi-channel digital receiving and demodulating device (PDU), each output of which is connected to an n-PC demultiplexing high-speed digital streams and k-PC demul typing of low-speed digital streams, while the inputs and outputs of the PC control and interaction PC demultiplexing high-speed streams and PC demultiplexing low-speed streams are interconnected by a local network, and the control output of the PC control and interaction is also connected to the control inputs of the multi-channel receiving and demodulating device.

The drawing shows a functional diagram of the proposed system.

The system contains a serially connected antenna 1 with a drive, a guidance and auto tracking system 2, an LNA with a frequency converter 3, a multi-channel digital receiving and demodulating device 4, parallel computers of high-speed digital stream demultiplexing 5 ₁ , 5 ₂ , ... 5 _n , as well as a control PC and 6, and PC interaction demultiplexing low flow 7 _1, 7 _2, ... 7 _n, wherein inputs / outputs of all PC combined LAN and the control output of the control PC and interactions 6 is connected to the control vlyayuschim input devices in the system 2 ... 4.

The system operates as follows.

Antenna 1 using the drive and guidance system 2 is aimed at the radiation object of interest. The signal received by antenna 1 through the LNA with a frequency converter 3 is fed to the input of a multi-channel digital receiving and demodulating device 4 ([4] - Patent No. 2305375 of August 27, 2007, “Multi-channel receiving and demodulating device for phase-shifted signals of communication systems”). The radio receiving device (RPU) of block 5 provides tuning by the ≈72 MHz band to any part of the monitored frequency band and converting it to the 140 MHz IF. Next, in the RPM, the IF signal is quantized according to the Kotelnikov theorem and each sample is converted to an 11-13-bit code. Each of the demodulators of block 4 provides tuning to any signal in the 72 MHz band (the number of signals in the 72 MHz band can reach several tens), performs digital demodulation, noise-free decoding, descrambling, deinterleaving (if such transformations take place in the monitored signal), and in accompanied by a clock frequency, the digital stream is fed to a PC for demultiplexing high-speed digital streams 5 ₁ , 5 ₂ , ... 5 _n . Demultiplexing is carried out programmatically.

Serially produced PCs provide software demultiplexing of digital streams at a speed of 2-3 Mbps.

Let in our case, the digital stream at a speed of 8 Mbps is demodulated. Then the PC 5 ₁ , 5 ₂ , ... 5 _n work as follows. On command from the host PC 6, the digital stream from the remote control 4 begins to be recorded on the hard drive and processed in the PC 5 ₁ . Since the recording speed is greater than the processing speed, then when the PCM 5 _{1 is completed, the} digital stream begins to be written to the PCM 5 ₂ , etc. The number of PC 5 depends on the speed of the input digital stream. In our case, four PCs are sufficient for demultiplexing the stream at a speed of 8 Mbit / s. 5. The demultiplexed streams to the PC 5 ₁ , 5 ₂ , ... 5 _n through the local network go to the control and interaction PC 6, where they are stitched at a speed of 2 Mbit / s. s on a local network are issued on a PC 7 ₁ , 7 ₂ , ... 7 _n , each of which demultiplexes the digital stream at a speed of ≈2 Mbit / s.

Blocks 2, 3, 4, 5, 5 ₁ , 5 ₂ , ... 5 _n , 7 ₁ , 7 ₂ , ... 7 _{n are} controlled from PC 6. Instead of PC 5, 5 ₁ , 5 ₂ , ... 5 _n , 7 ₁ , 7 ₂ , ... 7 _n microcontrollers can be used.

As a result of using the invention, the following technical and economic effect was obtained:

- simplified system diagram;

- digital IF signal processing is provided;

- the functions of PU decoding, descrambling, deinterleaving are provided;

- Ensured maximum use of computer technology in terms of control, interaction, demultiplexing;

- it is possible to adapt the system to new signals using software methods without physically changing the electrical circuit.

Nowadays, the Federal State Unitary Enterprise “RNIIRS” has developed and mass-produced a four-channel digital receiving and demodulating device (IUYAD.467747.072), an eight-channel device is being developed, and software for processing digital streams at speeds up to 2.4 Mbit / s using a personal computer has been developed.

Claims (1)

A multifunctional system for receiving, demodulating and processing signals of communication lines, comprising an antenna with a drive and a guidance and auto tracking system, a low-noise amplifier with a frequency converter, and a personal electronic computer for control and interaction, the outputs of which are connected to the control inputs of the drive with a guidance and auto tracking system and a low-noise amplifier with a frequency converter, characterized in that a multi-channel digital receiving and demodulating device, each whose output is connected to n-personal electronic computers for demultiplexing high-speed digital streams and k-personal electronic computers for demultiplexing low-speed digital streams, while the inputs / outputs of a personal electronic computer for controlling and interacting, personal electronic computers for demultiplexing high-speed streams and personal electronic computers demultiplexing low-speed streams of connections us between a local area network, a personal control output of a computer and interaction is also connected to the control inputs of the multi-channel receiving and demodulating device.