SU1661663A1 - Frequency-manipulated frequency deviation meter - Google Patents

Abstract

The invention relates to a radio measuring technique and can be used to determine parameters of radio signals. The purpose of the invention is to improve the measurement accuracy. A device for measuring the frequency deviation of the frequency-manipulated signals contains a phase shifter 1, three delay elements 2, two phase detectors 3, four multipliers 4, an addition unit 5, a subtraction unit 6 and an indicator 12. Introduction of two dispersion measurement units 7, division unit 8, full-wave rectifier 9, square-root extraction unit 10 and functional converter 11 can improve the accuracy of estimating the value of the frequency deviation by eliminating the influence of the amplitude of the input signal, the average frequency and probabilistic x akteristik modulation code. 2 Il.

Description

b (t) -b (t-t)

2, b (t) 1, b (t-T) -1, -2, b (t) -1, b (t-T) 1, 0, b (t) b (t-T) J1.

The output signal of the addition unit 5 approaches the input of the dispersion measurement unit 7-2. The calculation of the dispersion is carried out in accordance with the formula

D M g - m

where M is the second starting point; m - the first starting point.

Then at the output of block 7-2 dispersion measurement receive

  (t) -. (t)

 Р1 У cos2 (Р1-4- cos 2u «t)

 PI f cos2 2utaC (1

1o

8 15 P1 P2 yg1 cos 2Ш

where PI, P2 are code probabilities.

20 At the output of block 6, the sign is alternated; therefore, the output signal at the input of the dispersion block is through two

25 rectifier 9. Output 7-1 is defined as a process l:

I

(t) (t) ,, (t) C | ft4-

 PI Isin 2uQo | 2- (P1 -, jsin2uCO |) m I h I

 PI lsin 2uOl (1-PD 16 g

 P1 P2 jЈ | sin 2 & COtj2,

The signals of blocks 7-1 and 7-2 of the dispersion measurement are fed to the outputs of block 8 division:

lfliMH4 ““,

and with. its output through the square-root extraction unit 10 and the functional converter 11 - to the input of the indicator 12, indicating the measurement result of the frequency deviation

one

D R2 (t) J

yso 2 rarctg dTMO

Thus, the obtained estimate of the frequency deviation of the frequency-modulated signals does not depend on the amplitude of the input signal, the average frequency, and the probability characteristics of the modulating code, which improves the measurement accuracy.

 PI f cos2 2utaC (1-P1)

1o

8 P1 P2 yg1 cos 2Ш,

where PI, P2 are the probabilistic characteristics of the modulating code.

At the output of subtraction unit 6, an alternating function is formed, therefore, the output signal of unit 6 is fed to the input of unit 7-1 for dispersion measurement through a full-wave

rectifier 9. The output signal of block 7-1 is defined as the dispersion of the process module:

I

formula from

rete n i

0

five

0

five

A device for measuring the frequency deviation of the frequency-manipulated signals, comprising a phase shifter, three delay elements, a phase detector detector, four multipliers, an addition unit, a subtraction unit, and an indicator, the input bus of the device combined with the first inputs of the first delay element, the second phase detector, and through serially connected first phase detector and second delay element connected to the second inputs of the first and second multipliers, the outputs of which are connected respectively to the first inputs the summing unit and the subtracting unit, the second input of the second phase detector is combined with the second input of the first phase detector and the output of the first delay element, and the output through

the third delay element is connected to the second inputs of the third and fourth multipliers, the outputs of which are connected, respectively, to the second inputs of the subtraction unit and the summation unit, the first inputs of the first and third multipliers are combined with the input of the second delay element, and the first inputs of the second and fourth multipliers are connected to the third delay element, characterized in that, in order to improve the accuracy of measurements, in it to

additionally introduced in series are a full-wave rectifier, a splitter, a first dispersion measurement unit, a dividing unit, a square root extraction unit, a functional converter, and a second dispersion measurement unit, the output of the summation unit through the second dispersion measurement unit, output The subtraction unit is connected to the input of a two-half-cycle rectifier, and the output of the functional converter is connected to the input of the indicator.

Claims (1)

'The claims of the dispersion are supplied to the outputs of the division unit 8: and from its output through the square root extraction unit 10 and the functional converter 11, to the input of the indicator 12, indicating the measurement result of the frequency deviation b): A 1 Δ63 = tu-, arctg Thus, the obtained estimate of the frequency deviation of the frequency-modulated signals does not depend on the amplitude of the input signal, the average A device for measuring frequency deviation of frequency-manipulated signals, comprising a phase shifter, three delay elements, two phase detectors, four multipliers, an addition unit, a subtraction unit and an indicator, the input bus of the device being combined with the first inputs of the first delay element, the second phase detector and through series-connected the first phase detector and the second delay element is connected to the second inputs of the first and second multipliers, the outputs of which are connected respectively to the first inputs summing block and the subtractor, the second 55 input of the second phase detector of frequency and probabilistic characteristics! It is single with the second input of the first phase-modulating code, which allows to increase the accuracy of measurements. detector and the output of the first delay element, and the output through the third delay element is connected to the second inputs of the third and fourth multipliers, the outputs of which are connected, respectively, to the second inputs of the subtraction unit and the summing unit, the first inputs of the first and third multipliers are combined with the input of the second delay element, and the first inputs of the second and fourth multipliers - with the input of the third delay element, characterized in that, in order to improve the accuracy of measurements, additionally introduced included half-wave rectifier, chopper, first Persian dys5 measurement unit, division unit, square root extraction unit, functional converter, as well as a second dispersion measurement unit, the output of the summing unit through the second dispersion measuring unit 1θ connected to the second input of the division unit, the output of the unit subtraction is connected to the input of a half-wave rectifier, and the output of the functional converter is connected to the input of the indicator.