SU1094155A1 - Device for automatic check of multichannel radio receiver channels - Google Patents

Abstract

DEVICE FOR AUTOMATIC CONTROL OF CHANNELS OF MULTI-CHANNEL RADIO-RECEIVING DEVICES On the transmitter side, there are first and second attenuators, the outputs of which are connected to the inputs of the kangshov communication, and the inputs of the outputs of the first and second switches, which are connected, the drawers are connected with the drawers, and the drawers are connected. and a reference voltage generator, on the receiving side, a correlator and an indicator are connected in series, as well as a reference generator, characterized in that, in order to improve accuracy, not The shock excitation generator, the dispersion delay line, the third switch and the delay element, whose output is connected to the trigger input and control input of the third switch, whose output and input are connected to the combined information inputs of the first and second switches and the output of the dispersion delay line, the input of which is connected to the output of the shock excitation generator, the input of which is connected to the first output of the reference voltage generator, The output of which is connected to the input of the delay element, and on the receiving side - three delay elements, two mixers, two multipliers, two notch filters and two bandpass filters, while the outputs of the first and second channels are connected to inputs i of the first and second elements, respectively delays, the outputs of which are connected to the first inputs of the first and second mixers, respectively, the second inputs of which are connected to the outputs of the reference generator, and the outputs to the first inputs of the multipliers, the second inputs and. the outputs of which are connected respectively to the inputs of the first and second shutter elements and to the r inputs of the first and second notch filters whose outputs are connected to the inputs of the first and second band-pass filters, the output of the first band-pass filter connected: l: l to the first input of the correlator through the third the delay element, and the output of the second bandpass filter to the second input of the correlator.

Description

The invention relates to radio receiving technology and can be used in automatic systems of continuous and periodic monitoring of the parameters of receiving devices KB, VHF, SECH for various purposes without removing them from communication, as well as controlling multichannel spectrum analyzers of all specified ranges. A device for automatic control of the main channels of radio receivers is known, comprising a reference frequency generator, an input switch, an attenuator, a threshold unit, successively interconnected block h. Delays. and correlator, serially connected output switch and recorder, low pass filter, intermediate switch memory block, adder, frequency discriminator, frequency multiplier, analog-to-digital converter, decisive block, and first and second linear-step voltage generators , while the output of the reference frequency generator through the input switch is connected to the input of the delay unit, the output of the correlator through a series-connected low-pass filter, intermediate switch, memory block and output switch The tator is connected to the input of the registration unit, the output of the frequency discriminator, whose input is connected to the second input of the correlator, through a serially connected decision unit, the first linear-step voltage generator and an adder, is connected to the combined second inputs of the input and intermediate switches, the output of the memory unit through sequentially the connected threshold unit and the second linear-step voltage generator are connected to the second input of the output switch, and the output of the frequency discriminator is connected to These are connected to the inputs of the analog-to-digital converter and the frequency multiplier, which is connected to the second input of the analog-digital converter, the first and second outputs of which are connected to the second inputs of the low-pass filter and the adder, respectively, l. However, this device does not allow simultaneous monitoring and comparison of several communication channels. The closest in technical essence to the invention is a device for automatic control of channels of multichannel radiofrequency devices, containing on the transmitting side the first and second attenuators, the outputs of which are connected to the inputs of the communication channels, and the inputs to the outputs of the first and second switches, control inputs of which are connected respectively to the first and second outputs of the trigger, as well as the generator of the reference voltage, on the receiving side, the correlator and the indicator, as well as the reference generator, are sequentially connected Op 2j However, the known device has a low accuracy. The purpose of the invention is to increase accuracy. This goal is achieved in that the device for automatic control of channels of multichannel radio receivers, contains on the transmitting side first and second attenuators, the outputs of which are connected to the inputs of communication channels, and the inputs - to the outputs of the first and second switches, the control inputs of which are connected respectively The first and second outputs of the trigger, as well as the reference voltage generator, on the receiving side, a correlator and an indicator, as well as a reference generator, are serially connected to the front shock excitation generator, delay delay link, third switch and delay element, the output of which is connected to a counting trigger and control input of the third switch, the output and input of which are connected respectively to the combined information inputs of the first and second switches and the dispersion output a delay line, the input of which is connected to the output of a shock excitation generator, the input of which is connected to the first output of a reference voltage generator, the second output of which is connected en to the input of the delay element, and on the receiving side - three delay elements, two mixers, two multipliers, two notch Filters and two bandpass filters, while the outputs of the first and second channels are connected to the input w of the first and second delay elements, the outputs of which are connected to the first inputs of the first and second mixers, respectively, the second inputs of which are connected to. the outputs of the reference generator, and the outputs.- with the first inputs of the multipliers, the second inputs of which are connected respectively to the inputs of the first and second delay elements and the inputs of the first and second notch filters, the outputs of which are connected to the inputs of the first and second band-pass filters, and the output of the first filter connected to the first input of the correlator through the third delay element, and the output of the second bandpass filter to the second input of the correlator.

The drawing shows a structural electrical circuit of the proposed device.

The device for automatic control of channels of multichannel radio receivers contains on the transmitter side 1 a generator 2 of shock excitation, dispersion line 3 delays, trigger 4, element 5 Scr, first 6 and second 7 KOND TaTopu, first 8 and second 9 attenuators, radio receiver 10, third the switch 11 and the reference voltage generator 12, and on the receiving side 13, an indicator 14, the first and second multipliers 15 and 16, respectively, the first 17 and second 18 notch filters, the first and second band filters 19 and 20, respectively, orny generator 21, the first, second and third delay elements 22-24 sootvetstrenno, the correlator 25, the first 26 and second mixers 27, wherein the transmitting and the receiving side are connected via a radio receiver 10.

The device works as follows.

On the transmitting side 1, the generator 12 of the reference voltage takes pulses with a duration of 2y and a period of following Tp, which start the generator 2 of shock excitation. The radio pulse i passes through the delay line 3 (Converted into a linear frequency-modulated signal, and the third switch 11 generates the required duration of the linear-frequency-modulated signal, with delay element 5 having a delay time Cj, cutting the required portion of the signal obtained after the dispersion line 3. Delays. The summed signal is fed to the first b and second 7 switches, which are alternately turned on, controlled by a trigger 4. Through the first 8 and second 9 attenuators, the probing signals intensity traversed alternately supplied to the inputs of the controlled radio receiver 10.

At the receiving side 13, the STI signal is fed to the inputs of the first 22 and second 23 delay elements, as well as to the inputs of the first 15 and second 16 multipliers. At the same time, in the first 26 and second 27 mixers, using the reference generator 21, the stimulating signal is converted to a fixed frequency Up, regardless of the values of the carrier frequencies and. The first 15, second 16 multipliers, the first 17 and second 18 notch filters, and the first 19 and second 20 band filters form a fourth-order correlator,

The fourth order correlator analysis is performed under the following conditions. Stimulatory signal 5 (.O has a large base of 8) 1. The communication signal P (t, ocl in this case is a hindrance and is a quasi-deterministic harmonic process, the parameters of which are unknown. The HIch iri (t) is a Gaussian stationary process with a known correlation function. Suppose The spectral paic distribution of the stimulus signal, noise, noise, and the shape of the amplitude-frequency characteristics of all notch filters has a rectangular shape, and the frequency conversion, delay, and multiplication are perfect.

The study of the energy criterion is carried out on the basis of the spectral approach.

Introducing a fourth order correlator into the device provides a stimulating signal conversion and. interference (signal of communication) at a fixed frequency of sr, regardless of the values of carrier frequencies and interference

The delay time A..I of the first element 22delay. We choose from the condition

..,

where Sssor.r - correlation interval

interference; -itop.s correlation interval

stimulating signal. This leads to the fact that the spectral distribution of the stimulating signal is further broadened, and the interference spectrum remains narrow-band at a frequency of the litter. Setting the fourth-order correlator output of the combination of bandpass and notch filters eliminates the Hindrance component and isolates the Signal-Signal component with insignificant distortions. At the input of the first 19 and second 20 bandpass filters, we obtain the Signal-Signal and Signal-Hindrance components. , Signal noise, Interference-noise and Noise noise, the power of which is equal, respectively

R. 2 I.J1J. - iA 4iiJ

ui

r..b

-g.p- mp-S; v7Ui

ui

p..6

t.i

1 j 7

  Pg21l „

p, - (biV 4ii J signal dispersion; bandwidth controlled receiving device; signal bandwidth; mp - interference amplitude; jn - noise dispersion; iff, - noise band. The given ratios correspond to the case of uninterrupted spectrum of the stimulating signal 5 (i) and interference P (1, oc). The power of the Signal-to-Interference and Interference-to-Noise components depends on the value of carrier frequencies cog, Wp and the average frequency of the noise OJn. The highest level of Rd-p and Pp. o, ir-sl): if p - and .cV-iL pn mp, since all the components are on the output of the first 19 and second 20 band Since the filter is statistically independent, this allows the processes, entering the input of the correlator 25 directly and through the third delay element 24, to be represented by the model as a combination of signal, noise and noise. In this case, a signal means the Signal-Signal component, under interference, a Signal interference component, under noise, a combination of Signal-Noise, Interference-Noise and Noise-Noise components. When the condition di i 4-ifg is fulfilled, all components of the process normalize with. The powers of the individual components of the output are determined from the following relationships:.,., A. Fpul When Q. 1 q SI. TVHCR - .n 1 ex. ) v8 (Suppose 4Toqj ,, j, - 0.1-1, maintaining & i T - 10-- 1.0000 and fp (ALp) l., (. f;,. blH.; |. «L f ifT-, f: v (-%. s..j-; | -, 8..: “rOtV and b. with TT Bxsp, where;, In-n and sp are the powers P t P P 5-p signal, noise and interference, respectively;: v T is the integration constant; Г5 (ω) 1 — the signal correlation coefficient is equal to 1, since the delay time of the third delay element 24 is chosen equal to the pulse following period (.i, 7) Gr (ycr) is the correlation coefficient for utp-p-l e-gI When processing complex signals, the relation is always satisfied, which ensures the normalization of the output process and allows for Kterizovat noise immunity energy criteria, which is indicated by the indicator 14. Given the relationships for signal components, noise and noise at the output of the fourth order correlator, the expression for the energy criterion is: .. 2.1. 8 "Sp DZ. f expn tn then, at the output of the fourth order correlator, oi, OI - 100 I, 22– 2200. The study of the fourth order correlator energy criterion shows that it gives a significant gain if there is a disturbing radio receiver 10 at the outputnarrowband signal and internal noise at the level of the stimulating signal below the level of internal noise, which allows to dramatically increase the accuracy of control channels.

Claims (1)

DEVICE FOR AUTOMATIC CONTROL OF CHANNELS OF MULTI-CHANNEL RADIO RECEIVERS, containing; on the transmitting side, the first and second attenuators, the outputs of which are connected to the inputs of the communication channels, and the inputs - with the outputs of the first and second switches, the control inputs of which are connected respectively to the first and second outputs of the trigger, as well as a reference voltage generator, on the receiving side the correlator is connected in series and an indicator, as well as a reference generator, characterized in that, in order to increase accuracy, a shock excitation generator, a dispersion delay line, a third commutator are introduced on the transmitting side Ohr and the delay element, the output of which is connected to the counting input of the trigger and the control input of the third switch, the output and input of which are connected respectively to the combined information inputs of the first and second switches and to the output of the dispersion delay line, the input of which is connected to the output of the shock excitation generator, the input of which is connected to the first output of the reference voltage generator, the second output of which is connected to the input of the delay element, and on the receiving side there are three delay elements, two mixers, two multiplier, two notch filters and two band-pass filters, while the outputs of the first and second channels are connected to the inputs of the first and second φ delay elements, the outputs of which are connected to the first inputs of the first and second mixers, respectively, the second inputs of which are connected to the outputs of the reference generator, and outputs with the first inputs of the multipliers, the second inputs and. the outputs of which are connected respectively to the inputs of the first and second delay elements and to the inputs of the first and second rejection filters, the outputs of which are connected to the inputs of the first and second bandpass filters, the output of the first bandpass filter connected to the first input of the correlator through the third delay element, and the output of the second bandpass filter filter - to the second input of the correlator.