RU83162U1 - RADIO CONTROL SYSTEM VARIABLE BY FREQUENCY OF SHORT SIGNALS - Google Patents

Abstract

A radio monitoring system for changing frequency signals of short signals, comprising a radio receiving device, to which an analog signal is received, in which there are a series-connected converter of analog signals to an IF signal and a bandpass filter, an ADC, a processing device, a comparison unit and a memory device, a buffer device that can be tuned in series a receiver of digital signals and RAM, while the control inputs of the memory, RAM and tunable receiver of digital signals are connected to the corresponding outputs of the computer An era whose corresponding inputs are connected to the outputs of RAM, a digital filter, and a comparison unit, characterized in that an amplifier-splitter is installed at the input of the radio receiver, the input of which is the input of the radio receiver, and its outputs are connected to n radio channels, and n is selected from the condition :! where Δf is the bandwidth of the selected range,! a ΔF is the bandwidth of the channel of the radio receiving device, with each channel being a superheterodyne type radio receiver with digital signal processing, for which an analog signal preselector is included in each channel at the input, the output of which is connected to the input of the analog signal to signal converter of this channel, the output of the converter of the analog signal to the IF signal of this channel is connected to the input of the bandpass filter of the corresponding channel, the output of the bandpass filter of each channel is connected to the ADC input the channel of each channel ADC digital signal output is connected to an input of the preselector digital channel signal and output digital signal preselector

Description

The utility model relates to the field of radio engineering and can be used in adaptive radio communication systems to detect changing in frequency, including spasmodic, short signals when receiving in a wide passband.

A multi-channel radio receiver is known for simultaneously receiving a plurality of intermittently changing signals (see US Patent No. 6049562, M. Cl. Н04В 1/26, Н04В 1/713, Н04В 7/26, Н04В 1/62, Н04К 1/00, publ. 11.04 .2000 g), used to work with analog signals without their subsequent conversion to digital form. This receiver contains at the input a broadband filter and an amplifier, from the output of which the received and amplified analog signals are fed to filters tunable by frequency subbands, from the outputs of which the signals are fed to the corresponding converters of these signals to intermediate frequency (IF) signals, and then to the corresponding filters IF, the output of which is filtered analog IF signals.

Since this radio receiver works with analog output signals, there are problems of electromagnetic compatibility and low sensitivity of the radio reception, which leads to a decrease in noise immunity. With such a structure, it is impossible to simultaneously control a wide band of radio frequencies.

Known broadband radio used in cellular communication systems, which selectively receives signals with abruptly (rapidly) changing frequencies (see US patent No. 2005239432, Mcl H04J 1/00, HB04 1/69, H04J 13/00, HB04 1/713, H04L 27/26, H04J 1/00, Н04В 1/26, Н04В 1/16, Н04В 15/00, published on October 27, 2005). This receiver contains at the input a broadband filter and an amplifier, from the output of which amplified signals are fed to the filter bank for separation by frequency subbands. Further, the signals of the individual subbands are fed to the respective carrier frequency converters associated with the local oscillator, and the signals transformed into the corresponding frequency domain from the outputs of the converters are fed to analog-to-digital converters (ADCs).

This receiver is intended only for synchronous operation with a radio transmitter of a communication system.

At the same time, it does not selectively receive signals in a wide frequency band at the same time, but does it by scanning in frequency, and there are no means for selecting digital signals and combining them into a single digital stream, which does not allow radio monitoring simultaneously in a wide frequency band. unlike the previous analogue, it converts analog signals to digital, which improves the sensitivity of radio reception and electromagnetic compatibility (EMC).

A known method and device for the detection and automatic reception of short signals (see US application No. 2004208239, M.cl. H04B 1/38, H04K 3/00, publ. 21.10.2004,). The data of the invention allow using the operator to analyze a wide band of the high-frequency (HF) spectrum, automatically detect short signals that change rapidly in frequency, determine their novelty and register short signals and their subsequent processing and analysis.

To do this, in the device at the input where the analog signal enters, a step-down (or step-up) converter (receiver or tuner) is installed, which is tuned to the IF bandwidth, then the broadband IF signal from the converter output through the bandpass filter is fed to the IF analog filter, from which it is fed for digitization to the ADC input, and from its output - digital signal samples - to the digital signal processing device. In the digital signal processing device, the IF signal samples are divided into two identical streams, one of which passes through a reprogrammable logic device that converts the IF signal samples from the time domain to the frequency domain, and there is a processed spectrum at the output of this device. This spectrum is fed to a digital filter for digital filtering (averaging) of the received digital samples. Filtered spectral readings arrive at the corresponding input of the computer, which selects the main spectra and stores them (or masks) in a database (memory). The device also has a comparison unit, which continuously compares incoming signals with masks with those already in the database to determine the presence of new components in the IF spectrum. The second stream of digital IF readings passes through a buffer to the input of a receiver of narrow-band digital signals (tuner), from which streams of digital signals with a reduced frequency are fed to random access memory (RAM). The input and output of RAM are associated with the corresponding output and input of the computer. A real-time spectrum is formed at the output of the digital signal processing device, which makes it possible to detect the presence of an RF signal of short duration.

Due to the fact that this system provides simultaneous radio reception of an analog signal in a wide instantaneous passband, it has low noise immunity. Low noise immunity is due to the fact that for the detection and radio monitoring of short, rapidly changing in frequency signals in a wide band

of radio frequencies, it is required to use radio receiving channels with a wide dynamic range (DD), i.e. with high sensitivity and at the same time with a high upper boundary of the DD, which determines, to a large extent, the noise immunity of reception. However, with the existing element base, high noise immunity can be provided with a relatively narrow-band radio receiving path, i.e. To receive a broadband signal, it is necessary to use several narrow-band radios and then digitize, pre-digitally select and multiplex their output signals.

Therefore, due to the nonlinearity of the radio receiving path and the wide passband, intermodulation interference increases, which leads to a decrease in sensitivity, and the high energy of the total input signal blocks the radio receiving path and leads to the termination of the reception of radio signals.

When an analog signal is transmitted from the output of a radio receiving device to the input of a digital processing device using an analog line, electromagnetic compatibility problems arise, which also lead to a decrease in the sensitivity and noise immunity of the device from the influence of external and intrasystem radio interference.

In addition, when dividing a digital stream from the ADC output into two identical digital streams without selecting short signals, the time (speed) of processing and recording new short signals increases (since the data of all signals are sent to the comparison device, and it is necessary to select only short signals).

This device is selected for the prototype.

The achievable result of the utility model is to increase noise immunity and provide the necessary sensitivity and reliability of receiving short frequency-varying signals in a wide passband, reduce EMC problems and reduce the time (increase in speed) of processing and recording short signals.

This result is achieved in the proposed radio monitoring system of the frequency-varying short signals, comprising a radio receiver, to the input of which an analog signal is supplied, in which there are series-connected converter of analog signals to an IF signal and a bandpass filter, an ADC, a processing device, a comparison unit and a memory, serially connected buffer device tunable receiver of digital signals and RAM, while the control inputs of memory, RAM and tunable receiver The digital signals are connected to respective computer outputs, respective inputs of which are connected to the RAM outputs, the digital filter and comparator unit, characterized in that, on the

an amplifier-splitter is installed at the input of the radio receiver, the input of which is the input of the radio receiver, and its outputs are connected to n radio channels, and n is selected from the condition: where Δf is the bandwidth of the selected range,

a ΔF is the bandwidth of the channel of the radio receiving device, with each channel being a superheterodyne type radio receiver with digital signal processing, for which an analog signal preselector is included in each channel at the input, the output of which is connected to the input of the analog signal to signal converter of this channel, the output of the converter of the analog signal to the IF signal of this channel is connected to the input of the bandpass filter of the corresponding channel, the output of the bandpass filter of each channel is connected to the ADC input of that channel, the digital signal output of the ADC of each channel is connected to the input of the digital signal preselector of this channel, and the output of the digital signal preselector of each channel is connected to the corresponding input of the multiplexer / demultiplexer, the control outputs of which are connected to the control inputs of each channel, the other output and the input of the multiplexer / demultiplexer connected to the input and output, respectively, of the electron-optical converter of the stream of digital signals into the signal stream of the optical range, other output and One of which is connected respectively to the corresponding input and output of the first transceiver of the optical range signals, the other input and output of which are the input and output of the optical range signals of the radio receiver and connected respectively to the output and input of the second transceiver of the optical range signals, which is the output and input of the optical range signals of the device processing digital signals, while the other input and output of the second transceiver of the optical signal range connected to the output and input of the optoelectronic signal converter of the optical range into a digital signal stream, the other input and output of which is connected to the corresponding output and input of the received signal selector inserted into the digital signal processing device, the first output of which is connected to the input of the buffer device, the second output of the received signal is connected to the digital filter input, and the control input of the received signal selector is connected to the corresponding control output computer, wherein the corresponding inputs and outputs of the RAM, the digital filter, the comparator unit, memory, selector and received signals tunable

the digital signal receiver (tuner) are respectively the inputs and outputs of the digital signal processing device.

The implementation of the radio reception in the proposed system using n radio receiving channels, each of which is a superheterodyne receiver with analog-to-digital conversion using ADC and digital signal processing, provides increased noise immunity and sensitivity of the reception of radio signals in a wide frequency band, and also ensures reliable reception.

The use in the data transmission device of electro-optical and optoelectronic converters of digital signals and the first and second transceivers of signals of the optical range allows us to solve the problem of electromagnetic compatibility, since data is transmitted in the optical range.

The selector of the received signals of the digital stream installed in the device for processing digital signals allows, in contrast to the prototype, the selection of short signals that change rapidly in frequency, select them and process and register only short signals, which reduces the time (increases the speed) of processing and recording short digital signals .

The structural diagram of the proposed system is shown in the drawing, according to which the system contains a radio receiver 1, comprising an amplifier - splitter 2, the input of which receives an analog signal, the corresponding outputs of which are connected to the inputs of the corresponding n radio channels, the inputs of which are the inputs of the preselectors 3 of the analog signal. The output of the preselector 3 of the analog signal of each channel is connected to the input of the converter 4 of the analog signal to the IF signal of this channel, the output of which is connected to the input of the bandpass filter 5 of this channel, its output is connected to the input of the ADC 6 of this channel, and the output of the ADC 6 is connected to the input of the preselector 7 the digital signal of this channel, the outputs of the preselectors 7 of the digital signal of each channel are the outputs of the respective radio channels connected to the corresponding inputs of the multiplexer / demultiplexer 8, the control outputs to which are connected to the respective control inputs of each channel. The other output and input of the multiplexer / demultiplexer 8 are connected respectively to the input and output of the electron-optical converter 9, the other input and output of which are connected respectively to the output and input of the first transceiver 10 of the optical range signals, the other input and output of which are the input and output of the radio receiver 1 and serve for connecting, respectively, to the output and input of the digital signal processing device 11, the output and input of which is the output and input of the second signal transceiver 12 pticheskogo range, other output and input of which is connected to the input and output

respectively, of the optoelectronic converter 13, the other input and output of which is connected to the output and input, respectively, of the received signal selector 14, the first output of which is connected to the input of the buffer device 15, the output of which is connected to the input of the tunable digital signal receiver 16 (tuner), and its output is connected to RAM input 17, the second output of the received signal selector 14 is connected to the input of the digital filter 18, one of the outputs of which is connected to one of the inputs of the comparison unit 19, the second input of which is connected to the memory of the memory 20, while the control inputs of the memory 20, the selector of the received signal 14, tunable receiver 16 of the digital signal (tuner) and RAM 17, which are the control inputs of the device 11 for processing digital signals, are connected to the corresponding outputs of the computer 21, the corresponding inputs of which are connected to the outputs RAM 17, a digital filter 18, a comparison unit 19, which are outputs of the device 11 for processing digital signals.

The work of the proposed system is as follows. When an analog signal is received at the input of a radio receiving device, the latter is fed to the inputs of n radio receiving channels using an amplifier - splitter 2.

The number of channels is selected from the condition: where Δf is the bandwidth of the selected range, ΔF is the bandwidth of the radio channel.

After the amplifier - splitter 2, from its corresponding output, the signal is fed to the input of the preselector 3 of the analog signal of each of the n channels, in which the frequency is amplified and preselected (frequency subband selection). From the output of the preselector 3 in each radio receiving channel, the signal of the corresponding subband is supplied to the converter 4 of the analog signal into an IF signal and then the converted signal is fed to a bandpass filter 5, where the main filtering of the analog IF signal in the frequency band ΔF is performed. Next, the filtered analog IF signal is fed to the ADC 6 of this channel, where it is converted to a digital signal. This digital signal is supplied to the preselector 7 of the digital signal, at the output of which a passband ΔF is formed. From the outputs of the preselectors 7 of the digital signal of n channels, the generated signals are fed to the corresponding inputs of the multiplexer / demultiplexer 8, the control signals from which are fed to the corresponding control inputs of n radio channels. From another output and to another input of the multiplexer / demultiplexer 8, the signals are respectively input and output of the electron-optical converter 9, where the digital electrical signal is converted into an optical signal and then

arrives at the first transceiver 10 of the optical range signals, the corresponding output and input of which is the output and input of the radio receiving device 1. From the output of the radio receiving device 1, the optical signal is transmitted to the second transceiver 12 of the optical range signals included in the digital signal processing device 11. From its output, the signal of the optical range is fed to the optoelectronic converter 13 of the device 11 for processing digital signals. In the optoelectronic Converter 13 is the inverse conversion of the signal of the optical range into an electrical digital signal. Thus, at the output of the optoelectronic converter 13, we have a stream of digital signals of all channels. In this case, the channel control signal is supplied to the input of the optoelectronic converter 13. From the output of the optoelectronic converter 13, the digital signal is fed to the selector 14 of the received signals, in which digital multiplexing processing and selection of selectable short-duration signals are performed. From one of the outputs of the selector 14 of the received signals, the selected short signals are fed to the digital filter 18, and from the other output, all the signals that have passed the digital multiplexer processing are sent to the buffer device 15. From the output of the buffer device 15, all digital signals are sent to the tunable digital receiver 16 signals (tuner), which can be tuned to a specific narrower frequency band for its more detailed analysis, for this its control input is connected to the corresponding output of computer 21. Highlighted the signals from the corresponding output of the digital filter 18 are fed to one of the inputs of the comparison unit 19, to the second input of which the masks available in the database of the memory 20 are supplied of previously entered short signals. As a result of the comparison of the mentioned signals, at the output of the comparison unit 19, new short signals (spectrum components) are selected that were not in the memory of the memory 20. These signals are displayed on the computer 21 and entered into the memory of the memory 20. Computer 21 has a connection with the corresponding inputs and the outputs of the RAM 17, the digital filter 18, the comparison unit 19, the selector 14 of the received signals and the memory 20 to enable the display of output signals and spectra. In addition, it is possible to supply the appropriate control signals to the radio channels.

Consider an example of the execution of the blocks of the proposed system of radio monitoring varying in frequency of short signals.

The first transceiver 10 with an electron-optical converter 9 and the second transceiver 12 with an optoelectronic converter 13 can be performed on two Avago HEBR-5921 microcircuits.

The multiplexer / demultiplexer 8 can be performed on the FPGA (EPGA) EP2C 50 company "Altera".

The buffer device 15 can be performed on the FPGA (EPGA) EP2C 20 company "Altera".

The selector 14 of the received signals, the digital filter 18, the comparison unit 19, the tunable receiver 16 of the digital signals (tuner) and the memory 20 and RAM 17 can be performed on FPGAs EP2C 20 ... 50 from Altera.

The preselector 3 of the analog signal consists of switchable subjective filters and radio frequency amplifiers made on the Teledyne Congar chip ARJ109.

The converter 4 of the analog signal to the IF signal contains a mixer on a Mini-Circuites LAVI-2VH chip and a frequency synthesizer on Altera Cyclone II FPGAs and Analog Devices AD9726.

Bandpass filters 5 of the radio receiving channels can be implemented in the form of SAE filters AE5528M-70 from AES and filters 854651, 854652, 854653 from Sawtek.

The ADC of 6 radio receiving channels can be performed on the AD9446 microchip from Analog Devices.

Pre-selectors 7 of the digital signal can be performed on FPGA (FPGA) Cyclone II company "Altera".

As an amplifier - splitter 2 can be used splitter type ZSC company "Mini-Circuites" with an amplifier type SGA company "Sirenza".

As a computer, a computer of type UVM RAMEK can be used.

Claims (1)

A radio monitoring system for changing frequency signals of short signals, comprising a radio receiving device, to which an analog signal is received, in which there are a series-connected converter of analog signals to an IF signal and a bandpass filter, an ADC, a processing device, a comparison unit and a memory device, a buffer device that can be tuned in series a receiver of digital signals and RAM, while the control inputs of the memory, RAM and tunable receiver of digital signals are connected to the corresponding outputs of the computer An era, the corresponding inputs of which are connected to the outputs of RAM, a digital filter and a comparison unit, characterized in that an amplifier-splitter is installed at the input of the radio receiver, the input of which is the input of the radio receiver, and its outputs are connected to n radio channels, n is selected from the condition :

where Δf is the bandwidth of the selected range, a ΔF is the bandwidth of the channel of the radio receiving device, each channel being a superheterodyne type radio receiver with digital signal processing, for which an analog signal preselector is included in each channel at the input, the output of which is connected to the input of the analog signal to signal converter of this channel, the output of the converter of the analog signal to the IF signal of this channel is connected to the input of the bandpass filter of the corresponding channel, the output of the bandpass filter of each channel is connected to the ADC input of that channel, the digital signal output of the ADC of each channel is connected to the input of the digital signal preselector of this channel, and the output of the digital signal preselector of each channel is connected to the corresponding input of the multiplexer / demultiplexer, the control outputs of which are connected to the control inputs of each channel, the other output and the input of the multiplexer / demultiplexer connected to the input and output, respectively, of the electron-optical converter of the stream of digital signals into the signal stream of the optical range, other output and the course of which is connected respectively to the corresponding input and output of the first transceiver of the optical range signals, the other input and output of which are the input and output of the optical range signals of the radio receiver and connected respectively to the output and input of the second transceiver of the optical range signals, which are the output and input of the optical range signals of the device processing digital signals, while the other input and output of the second transceiver of the optical signal range connected to the output and input of the optoelectronic signal converter of the optical range into a digital signal stream, the other input and output of which is connected to the corresponding output and input of the received signal selector inserted into the digital signal processing device, the first output of which is connected to the input of the buffer device, the second output of the received signal is connected to the input of the digital filter, and the control input of the selector of the received signals is connected to the corresponding control output a computer, the corresponding inputs and outputs of RAM, a digital filter, a comparison unit, memory, a received signal selector and a tunable digital signal receiver (tuner) are respectively the inputs and outputs of the digital signal processing device.