RU65329U1 - HIGH SPEED MULTI-CHANNEL RADIO RECEIVER OF HF RANGE - Google Patents

Abstract

The utility model relates to radio engineering and can be used in the equipment of broadband systems for multi-channel communication of the KB frequency range. The technical result is the ability to process the entire KB range simultaneously with the allocation of narrowband signals in separate channels using a device that has a PCI interface and used as part of a PC, as well as the technical simplicity of the device. The device comprises a bank of low-pass filters, a bank of high-pass filters, a controlled amplifier, ADC, a module for allocating and processing digital channels, a module for managing the path nodes and outputting information through the PCI interface.

Description

The utility model relates to radio engineering and can be used in equipment of broadband systems for multi-channel communication of the KB frequency range, including mobile radio monitoring complexes.

Known radio receiver KB range P-399 (http://www.cqham.ru/trx/r_399.html) [1], containing a bank of bandpass filters of the preselector, a radio frequency amplifier, a first mixer and a first local oscillator, an amplifier of the first intermediate frequency with adjustable gain, bandpass filter of the first intermediate frequency, second amplifier of the first intermediate frequency, second mixer and second local oscillator, amplifier of the second intermediate frequency with adjustable gain, bank of bandpass filters of the second intermediate frequency, second amplifier rer second intermediate frequency. Moreover, the output of the bank of bandpass filters of the preselector is connected to the input of the radio frequency amplifier, the output of which is connected to the input of the first mixer, the output of the first mixer through the amplifier of the first intermediate frequency with an adjustable gain and the bandpass filter of the first intermediate frequency is connected to the input of the second amplifier of the first intermediate frequency, the output of which is connected with the input of the second mixer, the output of the second mixer through the amplifier of the second intermediate frequency with an adjustable gain and a bank VAVO second intermediate frequency filter connected to the input of the second amplifier of the second intermediate frequency. The first local oscillator is connected to the input of the local oscillator of the first mixer, and the second local oscillator is connected to the input of the local oscillator of the second mixer.

A disadvantage of the known device is its high complexity (two frequency conversions) and a limited band of received frequencies, up to 10 kHz. In many cases, you need to take the entire KB range from 1 MHz to 30 MHz. Other disadvantages include the impossibility of multi-channel processing due to the lack of necessary technical means.

A radio receiver is also known comprising a first mixer, a first local oscillator, a first intermediate frequency amplifier and a second mixer, the output of the first mixer through the first

an intermediate frequency amplifier is connected to the first input of the second mixer (see the Handbook on the educational design of receiving-amplifying devices / M.K. Belkin, V.T. Belinsky, Yu.L. Mazor, PM Tereshchuk. - 2nd ed. - K .: Vysha shk., 1988. S. 377, Fig. 13.4) [2].

The disadvantage of this device is the impossibility of multi-channel reception. Another disadvantage is the impossibility of optimal selection of the received frequency band, due to the fixed value of the preselector band.

Also known is an AR-7030 radio receiver (http://www.aoruk.com/pdf/7030m.pdf) [3] containing a controlled attenuator, a low-pass filter, a radio frequency amplifier, a first mixer and a first local oscillator, a bandpass filter of the first intermediate frequency , a second mixer and a second local oscillator, a bank of 6 bandpass filters of the second intermediate frequency, an amplifier of the second intermediate frequency, a bank of 2 bandpass filters, a signal detector. Moreover, the output of the controlled attenuator through the low-pass filter and the radio frequency amplifier is connected to the input of the first mixer, the output of which through the bandpass filter of the first intermediate frequency is connected to the input of the second mixer, the output of the second mixer through a bank of 6 bandpass filters of the second intermediate frequency, the amplifier of the second intermediate frequency and the bank of 2 bandpass filters connected to the input of the signal detector. The first local oscillator is connected to the input of the local oscillator of the first mixer, and the second local oscillator is connected to the input of the local oscillator of the second mixer.

The disadvantage of this device is the impossibility of multi-channel reception, a narrow band of the output signal up to 10 kHz.

A radio receiver WR-G313i is also known, which consists of a controlled attenuator, a bandpass filter bank, a radio frequency amplifier, a first mixer and a first local oscillator, a first intermediate frequency bandpass filter, an adjustable first gain intermediate frequency amplifier, a second mixer and a second local oscillator, and a second intermediate amplifier frequency, bandpass filter of the second intermediate frequency, ADC, digital signal processing module and control of the path nodes using the PCI interface, DAC low hour tots, personal computers. The output of the controlled attenuator through the bank of bandpass filters and the radio frequency amplifier is connected to the input of the first mixer, the output of which is through the bandpass filter of the first intermediate frequency and the amplifier of the first intermediate frequency with adjustable

the gain is connected to the input of the second mixer, the output of the second mixer through the amplifier of the second intermediate frequency and the bandpass filter of the second intermediate frequency is connected to the input of the ADC, the output of the ADC is connected to the input of the digital signal processing module and control of the channel nodes using the PCI interface, the signal output of which is connected to low frequency DAC input, control input connected via PC to PC bus. (http://www.winradio.com/pdf/g313i-review-radcom.pdf, fig.1) [4] - prototype.

A known radio receiver was selected as a prototype as the most consistent with the claimed utility model for most technical features.

The disadvantages of the known device are its high complexity (two frequency conversions), the impossibility of multi-channel reception, the digital signal processing module (in the original DSP) processes only one low-speed signal, and the PCI bus high-speed capabilities for transmitting a digital signal for processing in a PC are not used.

A useful model of a high-speed multi-channel KB radio receiver is proposed, which does not have these drawbacks.

The technical result is the provision of multi-channel signal reception simultaneously in the entire frequency band of the KB range, increased noise immunity due to the possibility of preliminary frequency selection of signals in a wide band, the simplicity of technical implementation.

The technical result is achieved due to:

- introducing a preselector to the input of the device with the ability to select the optimal bandwidth and rejection of powerful interfering signals or parts of the range, providing increased noise immunity.

- the introduction of additional digital signal processing channels that are connected to the output of the ADC and provide multichannel.

- the use of the PCI interface not only for controlling the nodes of the device, but also providing high-speed data output when receiving signals in the entire KB range.

- use of direct analog-to-digital conversion of the radio signal, without transferring to the auxiliary intermediate frequency.

A high-speed multi-channel KB radio receiver contains a controlled amplifier, ADC, PC, and the output of the amplifier is connected to the input of the ADC.

According to the utility model, a bank of low-pass filters (low-pass filters) and a bank of high-pass filters (high-pass filters) are introduced into a high-speed multi-channel KB radio receiver, which comprise a selector, a digital channel allocation and processing module, a path and output node control module via a PCI interface. Moreover, the bank input from the low-pass filter is the input of the device, its output is connected to the bank input from the high-pass filter, the output of which is connected to the ADC through a controlled amplifier, the ADC signal output is connected to the digital channel extraction and processing module, the channel outputs of the digital channel extraction and processing module are connected to channel inputs of the module for managing the nodes of the path and outputting information through the PCI interface, the output of which via the PCI bus is connected to the PC, the control outputs of the module for controlling the nodes of the path and outputting information through the PCI interface are connected with control inputs for selecting a bank filter from the low-pass filter and a bank from the high-pass filter.

Figure 1 shows a functional diagram of a utility model. Figure 2 shows an embodiment of the bandwidth of the preselector.

The inventive device comprises an input 1, a bank from the low-pass filter 2, a bank from the high-pass filter 3, a controlled amplifier 4, ADC 5, a module for extracting and processing digital channels 6, a module for managing the nodes of the path and outputting information through the PCI interface 7, PC 8.

The bank input from the filters of the low-pass filter 2 is the input 1 of the device, its output is connected to the input of the bank from the high-pass filter 3, the output of which is connected to the ADC 5 through a controlled amplifier 4, the signal output of the ADC 5 is connected to the digital channel extraction and processing module 6, the digital channel outputs of which connected to the channel inputs of the module for managing the nodes of the path and outputting information through the PCI interface 7, the output of which is connected to the PC 8, the control outputs of the module for managing the nodes of the path and outputting information through the PCI interface 7 are connected to the control inputs filter bank from LPF 2 and bank from HPF 3.

The device operates as follows.

At the bank input from the low-pass filter 2, a group spectrum containing a large number of narrow-band signals is received; at the output of this filter, only signals of either the part of interest or the entire HF range are selected. Next, the signal is fed to the bank input from the high-pass filter 3. For example, low-pass and high-pass filters included in banks 2 and 3 can have the following cutoff frequencies:

1) 2 MHz;

2) 4 MHz;

3) 6 MHz;

4) 8 MHz;

5) 10 MHz;

6) 12 MHz;

7) 16 MHz;

8) 18 MHz;

9) 20 MHz;

10) 22 MHz;

11) 24 MHz;

12) 26 MHz;

13) 28 MHz;

14) 30 MHz;

The cutoff frequencies of the filter can have a smaller step than 2 MHz, in this case the useful signal can be distinguished in an even narrower band with a higher signal to noise ratio, or the powerful signal masking the useful signal can be suppressed with greater accuracy. As field and mathematical experiments show, this set of filters is optimal for the possible formation of various band and notch filters and the complexity of technical implementation [5]. The order of the filters is determined by the necessary suppression of adjacent channels and in practice does not exceed 7-8.

By selecting the appropriate low-pass filter from bank 2, either the upper border of the passband or the lower border of the notch of the preselector is formed (see Fig. 2). Next, the signal from the bank exit from the low-pass filter 2 is fed to the bank input from the high-pass filter 3 to form either the lower boundary of the passband or the upper boundary of the notch of the preselector, and then, depending on the electromagnetic environment, the signal with the formed band from the bank exit from high-pass filter 3 is received

to the input of a controlled amplifier 4 for amplification to the maximum power level necessary to supply the input of the ADC 5 without overload. The digital signal in the selected band from the output of the ADC 5 is fed to the input of the digital channel selection and processing module 6. The number of digital channels depends on the computing resources of module 6 [6, 7]. The signals from the corresponding outputs of the digital channels of module 6 are fed to the channel inputs of module 7 for subsequent transmission via the PCI bus to the PC, where they are further processed, which depends on the task. From the PC via the PCI bus, commands are received to control the configuration of the path of the proposed device:

- selection of the low-pass filter from bank 2;

- selection of the HPF filter from bank 3;

- the choice of amplification or attenuation of the signal through the amplifier 4, and the gain of the amplifier can be controlled both from module 6 and from module 7, depending on the particular implementation of the algorithm for estimating the signal level.

Using a similar path configuration, you can either process the entire KB range, or select a certain part of it, or suppress a part of the range if it contains powerful signals that block useful weak signals.

Using a PCI bus with a bandwidth of 120 MB / s and, for example, the AD6645 ADC (Analog Devices) with a clock frequency of up to 105 MHz or a similar one in characteristics, allows you to receive the entire frequency band of the KB range (about 30 MHz signal band, respectively, with 14-bit ADC resolution digital stream speed of about 50 MB / s) and transmit the signal in digitalized form for further processing in a PC. Moreover, the resources of the PCI bus allow, along with the transmission of the entire signal band, to transmit and selected from it individual narrow-band signals in separate digital channels, thereby providing multi-channel reception.

Introduction to the device of additional channels for digital signal processing, connected to the ADC output and providing an increase in the number of digital reception channels and a high-speed data transmission module using the PCI bus, as well as a switchable selector, consisting of two banks of low-pass and high-pass filters, which increase the noise immunity of reception due to interference suppression, allows to achieve a technical result - multi-channel signal reception in a wide frequency band, as well as increased noise immunity due to the possibility pre-frequency selection of signals.

List of sources

1. Technical description of RPU R-399.

http://www.cqham.ru/trx/r_399.html.

2. A guide to the educational design of receiving-amplifying devices / M.K. Belkin, V.T. Belinsky, Yu.L. Mazor, P.M. Tereshchuk. - 2nd ed. - K .: Vyshka school., 1988.

3. Operating Manual. Receiver AR7030. AOR (UK) Ltd.

http://www.aoruk.com/pdf/7030m.pdf.

4. WinRadio WR-G313i PC-controlled receiver. Chris Lorek. RadCom, March 2005. http://www.winradio.com/pdf/g313i-review-radcom.pdf - prototype.

5. A method for optimizing the selection and dynamic characteristics of radio reception paths. V.V. Shchebet, I.I. Kashchenko, O.A. Shavrin. Radio monitoring. Release 9. 2006

6. Goldenberg L. M., Matyushkin B. D., Polyak M. N. Digital Signal Processing: A Guide. - M .: Radio and communications, 1985.

7. Solonina A.I., Ulahovich D.A., Arbuzov S.M., Solovieva E.B., Guk I.I. Fundamentals of Digital Signal Processing: Lecture Course. - SPb .: BHV - Petersburg, 2003.

Claims (1)

A high-speed multi-channel KB radio receiver containing a controlled amplifier and an analog-to-digital converter (ADC), the amplifier output being connected to an ADC input, characterized in that a bank of low-pass filters and a bank of high-pass filters that make up the selector are inserted into it allocation and processing of digital channels, a module for managing the path nodes and outputting information through the PCI interface, and the bank input from low-pass filters is the input of the device, its output is connected to the input ohm of a bank of high-pass filters, the output of which through a controlled amplifier is connected to the ADC, the signal output of the ADC is connected to the module for extracting and processing digital channels, the channel outputs of the module for extracting and processing digital channels are connected to the channel inputs of the module for managing the path nodes and outputting information through the PCI interface whose output via the PCI bus is connected to the PC, the control outputs of the module for managing the path nodes and outputting information through the PCI interface are connected to the control inputs of the bank filter selection from the filters low frequency and a bank of high frequency filters.