RU29817U1 - MULTIPLE RADIO RECEIVER - Google Patents

Description

Multi-path radio receiver.

The invention relates to radio communication technology, in particular to short-wave radio receivers.

Known multichannel radio receivers based on single-board short-wave radios. An example of such a radio is the EM010 radio from Rohde & Schwarz. However, such radios in terms of frequency selectivity, which determine

noise immunity, do not satisfy the requirements for connected radio receivers and are used, as a rule, for the purpose of radio monitoring 1.

As a prototype, a connected 8-channel P-691 radio receiver was selected, which allows simultaneous reception at 4 independent frequencies. Each receiving path is made according to a superheterodyne circuit with triple frequency conversion and has a preselector made in the form of switchable sub-octave filters, a frequency conversion path, a local oscillator generation unit (one to two receiving paths), a reference frequency generation unit (one to two receiving paths), a demodulator signals, power supply unit, common control panel for all receiving paths. The disadvantage of this device is the large overall dimensions and mass of the radio. Overall dimensions 510x680x1850 mm, weight - 370 kg 2.

The objective of the utility model is to reduce the overall dimensions and mass of a multi-path radio and increase its noise immunity.

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paths, a signal demodulator, a reference frequency generating unit, a control panel and a power supply unit, and a reference frequency generating unit and a control panel are connected to each analog path and a signal demodulator, and the power supply unit is connected to all blocks of the radio receiving device, each of the analog paths is made by superheterodyne circuit with double frequency conversion and contains, in series connected preselector, made in the form of a tunable circuit, and a frequency conversion path s, and the input of the preselector is the input, and the output of the frequency conversion path by the output of the analog path, as well as the local oscillator generation unit, the output of which is connected to the frequency conversion path, the control inputs of the preselector and the local oscillator generation unit are connected to the control panel, and to the reference frequency input of the formation unit of the local oscillators, the output of the reference frequency forming unit is connected, a signal demodulator is introduced, connected to each of the analog paths using keys and containing sequentially A signal sampling device, an analog-to-digital converter, a storage device, and a digital computer having four digital outputs, each of which is connected in series with a digital-to-analog converter and a smoothing filter, the output of each smoothing filter being the output of the corresponding path of a multi-channel radio receiving device , the digital computer has four key management outputs connected to the key control inputs, as well as a frequency output retizatsii connected to the clock input of the sampling unit signal input memory connected to input software download digital computer and its input to the control panel.

To increase the noise immunity, the preselector is made in the form of a tunable circuit.

In FIG. 1 is a structural diagram of four path radio receivers, which contains four independent analog paths 1, 2, 3, and 4, a signal demodulator 5, connected in turn to each of the analog paths using keys 6, 7, 8, and 9, a reference frequency generating unit 10 , the control panel 11 and the power supply unit 12, and the reference frequency generation unit 10 and the control panel 11 are connected to each analog path and to the signal demodulator 5, and the power supply unit 12 is connected to all blocks of the radio receiving device. Each of the analog paths is made according to a superheterodyne circuit with double frequency conversion and consists of a series-connected preselector 13, made in the form of a tunable circuit, and a frequency conversion path 14, the input of the preselector 13 being an input, and the output of the frequency converting path 14 as an output of the analog path 1, as well as a local oscillator generation unit 15 connected to the path

14 frequency conversion, control inputs of preselector 13 and unit

15 formation of local oscillators connected to the control panel 11. The output of the reference frequency generating unit 15 is connected to the input of the reference frequency unit of the local oscillator generation unit. The signal demodulator 5 is based on digital signal processing and contains a series-connected signal sampling device 16, an analog-to-digital converter 17, a storage device 18, and a digital computer 19 having four digital outputs, each connected to a digital-to-analog converter and a smoothing one a filter, respectively 20 and 21; 22 and 23; 24 and 25; 26 and 27, the output of each smoothing filter being the output of the corresponding four-channel path

radio receiver. The digital computer 19 has four key management outputs connected to the control inputs of the keys 6, 7, 8, and 9, as well as a sample rate output connected to the clock input of the signal sampling device 16. The input of the storage device 18 is connected to the input of the software download of the digital computer 19, and its input to the control panel 11.

The device operates as follows:

The signals are fed to the input of the analog paths 1, 2, 3, and 4, each of these paths is tuned to its own operating frequency in accordance with the pre-selector 13 and local oscillator generation unit 15 codes coming from the control panel And, as a result, the input signal is preselected in the preselector and then in the frequency conversion path 14, its spectrum is transferred to an intermediate frequency that is the same for all analog paths, and equal, in this case, 128 kHz. To obtain the necessary frequency stability, the local oscillator generation blocks of all analog paths and the digital computer 19 are synchronized by a highly stable reference frequency signal generated by the reference frequency block 10. The signals from the outputs of the analog paths 1, 2, 3, and 4 using the keys 6, 7, 8, and 9 are alternately connected to the input of the signal sampling device 16, moreover, control of the keys 6, 7, 8, and 9, as well as clocking of the signal sampling device 16, is carried out by a digital calculator 19. Thus, the signal sampling device 16 selects instantaneous signal values at the output of the analog paths 1, 2, 3, and 4 at certain points in time, which, in the analog-to-digital converter 17, are converted to digital form and transmitted to the digital numerator 19 on it with the storage device 18

a signal processing program is received, including digital filtering and signal demodulation, the processing program may be different for signals coming from different analog paths, and is selected in accordance with the commands received from the control panel 11. The demodulated signal in digital form is fed to a digital-to-analog converter, separate for each of the paths: 19 for the first path, 21 for the second path, 23 for the third path and 25 for the fourth path. At the output of each digital-to-analog converter there is a step function approximating the Demodulated signal. To convert it into an analog signal, a smoothing filter is used, which limits the spectrum of the approximating function without passing the spectral components formed during sampling and digital signal processing to the output of the device. Thus, at the output of the smoothing filters, which are the outputs of the multi-channel radio receiver, there are demodulated analog signals corresponding to the signals received by each of the receiving paths.

As a result of such construction of the radio receiving device, it was possible to reduce the overall dimensions of the product and its mass by more than 10 times, which were respectively 446x504x230 mm and 35 kg.

Sources of information:

1. Catalog of the company Rohde & Schwarz. 2000/2001, Radimonitoring and Radiolocation Products and Solutions.

2. Technical description of the product P-691, TsL2.003.111 TO.

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Claims (1)

A multi-path radio receiving device consisting of independent analog paths, a signal demodulator, a reference frequency generating unit, a control panel and a power supply unit, the reference frequency generating unit and a control panel being connected to each analog path and a signal demodulator, and the power supply unit connected to all the radio receiving units devices, each of the analog paths is made according to a superheterodyne circuit with double frequency conversion and contains preselect in series OR, made in the form of a tunable circuit, and a frequency conversion path, the preselector input being an input, and the frequency conversion path output as an analog path output, as well as local oscillator generation unit, the output of which is connected to the frequency conversion path, control inputs of the preselector and local oscillator generation unit are connected with a control panel, and the output of the reference frequency generating unit connected to the reference frequency input of the local oscillator generation unit, characterized in that the signal demodulator It is accessible to each of the analog paths using keys and contains a series-connected signal sampling device, an analog-to-digital converter, a memory device, and also a digital computer having four digital outputs, each of which is connected to a digital-to-analog converter and a smoothing filter, the output being each smoothing filter is the output of the corresponding path of the multi-channel radio receiving device, the digital computer has four outputs key management, connected to the control inputs of the keys, as well as the output of the sampling frequency connected to the clock input of the signal sampling device, the input of the storage device is connected to the software download input of the digital computer, and its input to the control panel.