SU1518890A2 - Autocorrelation device for measuring parameters of pseudorandom phase-manipulated signal - Google Patents

Abstract

This invention relates to radio. The purpose of the invention is to expand the functionality. The autocorrelation meter of pseudo-random phase-manipulated signal contains multipliers 1.10 and 20, delay element 2, band-pass filter 3, nonlinear element 4, filters 5, 7, 11 and 21 low frequencies, frequency tuning generator 6, meters 8 and 9, valves 12.30 and 40, counters 13 and 34 pulses, signal base meter 14, package duration meter 15, arithmetic unit 16, recording unit 17, phase shifters 18 and 19, quadrants 22 and 23, adder 24, square root extraction unit 25, threshold block 26, keys 27 and 37, detectors 28 and 38 envelope, differential circuits 29 and 39, trigger 31, element 32, generator 33 counting pulses, divider 35 and multiplier 36. The goal is achieved by increasing the number of measured parameters, which include the average frequency of the signal spectrum, the rate of change of the signal frequency, the duration of the elementary parcels, as well as the base and duration of the signal. 1 il.

Description

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. I) acquisition refers to radio communications and can be used as a device for processing a phase-shift-P) 1X (M-1) signal in discrete information transmission systems, in combined communication systems and in radar, where pseudo-first FM is widely used. Signals with linear frequency modulation OTCHM),

The purpose of the invention is to expand the functional capabilities by increasing the number of measured parameters.

The drawing shows the electrical circuit diagram of an autocorrelation meter for the parameters of a pseudo-random FM signal.

The device contains the first block 1 at the fire, the delay element 2, the band-pass filter 3, the nonlinear element A, the first low filter 5, the tuning speed converter 6, the second low-pass filter 7, the first 8 and the second 9 frequency meters, second - poi i block 10 multiplication, third filter 11 Н 11Жних frequencies, first gate J2, first counter of 13 pulses, meter 14 of the signal base, meter 15 duration of the feed ,; arithmetic unit 16, registration unit 17, phase reversals 18 and 19, third block 20 tons 1, fourth low pass filter 21, quadgers 22 and 23, adder 24, square root extraction unit 25, threshold block 26, first key 27, first envelope detector 28, differential circuit 29, second valve 30, trigger 31, element I32 ,, generator 33 counting pulses, second counter 34 pulses, divider 35 5 multiplier 36, second switch 37, second envelope detector 38, second differential circuit 39 and the third valve 40,

The meter works as follows.

In the presence of a linear frequency modulation in the received signal, the multiplication of the delayed and delayed signals in element 2 in block I multiplies the beats with high-frequency filling that come through the band-pass filter 3 and the nonlinear element 4. The width of the beat spectrum in M FcTq (uFp - frequency deviation) times the spectrum of the received signal, and the position of the spectrum on the frequency axis is determined by the average frequency ftp equal to the value of

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G r - changes in the signal frequency by the amount of delay C in element 2, t. e.

with vT ... h

fcp G - z - 1) d

According to (1), when the delay time v in element 2 is changed using the linear-speed tuning generator 6, the average frequency fcp changes. Measure the value of the average frequency of the signal spectrum with a frequency meter and the value of the delay c, determine the rate of change of the frequency of the signal Y

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In order to measure the delay value o-, corresponding to f, when a voltage appears at the output of the low-pass filter 7, the threshold unit 26 generates a control pulse arriving at the inputs of the keys 27 and 37 and opens them. In the initial state, the keys i 27 and 37 are always closed. Undelayed and delayed signals are detected. detectors 28 and 38 of the envelope and are differentiated with differential circuits. 29 and 39. As a result of differentiation, positive and negative pulses are formed, corresponding to the beginning and end of the signal. At the output of the unipolar gates 30 and 40, only positive pulses are generated, the first of which is the trigger 31, and the second returns to the initial state after the time interval o-i. The output pulse of the duration ti of the trigger 31 controls the element AND 32. During the duration of the pulse, the counting pulses from the output of the generator 33 enter the counter 34. Information about the value of T in the binary code from the output of the counter 34 goes to one input of the divider 35, the other input to which in binary code information about the value of f j. 9 meter frequency output. Divider 35 calculates velocity velcins.

frequency change, which is recorded in block 17 and fed to the input of multiplier 36. To another input of multiplier 36, in binary code from the output of meter 15, information about the duration of the elementary

parcels To, In multiplier 36, the magnitude of the frequency deviation LR is calculated.

, y in the binary code, which is recorded in block 17. In block 17, the duration of the elementary parcels T is also recorded

base N and duration of Tg signal.

F o

rmula of invention

An autocorrelation pseudo-random phase-shift keyed signal generator according to aut., No. I297238, characterized in that, in order to extend the functionality by increasing the number of measured parameters, a series-connected threshold unit is introduced, the first key, the first envelope detector, the first differential circuit, second valve, trigger, element And, second pulse counter, divider and multiplier, successively

The second key, the second envelope detector, the second differential circuit and the third valve, the output of which is connected to the second trigger input, the generator of counting pulses, the output of which is connected to the second input of the And element, the first output and the second input of the delay element are respectively connected to the second input the first key and the first input of the second key, the second input of which is connected to the output of the threshold unit, the input of which is connected to the second low-pass filter, the output of the second frequency meter is connected to another The input of the divider, the output of which is connected to the fifth input of the registration unit, the output of the package duration meter, is connected to another input of the multiplier, the output of which is connected to the sixth input of the registration unit.

Claims (1)

Claim An autocorrelation meter of para-, θ meters of a pseudo-random phase-manipulated * signal according to Autost No. 1 297238, characterized in that, in order to expand the functionality by increasing the number of 15 measured parameters, a threshold block, the first key, are connected in series first envelope detector, first differential circuit, second gate, trigger, element And, 20 second pulse counter, divider and multiplier, second key connected in series, second envelope detector, second differential circuit the third valve, the output of which is connected to the second input of the trigger, a counting pulse generator, the output of which is connected to the second input of the And element, while the first output and the second input of the delay element are connected respectively to the second input of the first key and to the first input of the second key, the second input of which connected to the output of the threshold unit, the input of which is connected to the output of the second low pass filter, the output of the second frequency meter is connected to another input of the divider, the output of which is connected to the fifth input of the recording unit, measuring stroke length of parcels connected to another input of the multiplier, whose output is input to a sixth soedynen registration unit.