SU1652937A1 - Device for checking electric length constant of long microwave path - Google Patents

Abstract

The invention relates to radio engineering. The purpose of the invention is to increase the languor of the control. The device contains a microwave generator 1, directional couplers 2, 4 and 5, a stretched microwave path 3, payload 6, phase discriminators 7 and 13, low frequency amplifiers 8 and 14, indicator 9, low frequency generator 10, coefficient modulator 11 the reflection, the controlled phase shifter 12, the phase detector 15 and the integrator 16. The condition for the accurate operation of the monitoring device is to satisfy the following relations:,, where V ,,, Mri are the amplitudes of the reflected and incident waves arriving at the discriminator 7, as well as vrr,, where V. ,, Vra - amplitudes of reflected and incident waves, fasting This can be achieved by selecting the coupling coefficient in the directional couplers 2 and 4. The goal is achieved by introducing into the circuit a phase-locked loop consisting of directional couplers 4 and 5 and controlled by the phase switch 12, the additional discriminator 13, amplifier 14, detector 15 and integrator 16. 1 Il. Ј (L

Description

about

SL IsD

WITH

from 1

The invention relates to radio engineering and can be used in transmitting and receiving devices where high accuracy of the phase characteristics of the feeder paths is required.

The aim of the invention is to improve the accuracy of the control.

The drawing shows the structural electrical circuit of the device controlling the constancy of the electrical length of the extended microwave path.

The device contains an I microwave generator, the first directional coupler 2, the extended microwave path 3, the second and third directional switches 4, 5, the payload 6. the first phase discriminator 7, amplify 8 low frequencies, the indicator 9, the generator 10 low frequencies, reflection reflector modulator 11, controlled phase shifter 12, second phase discriminator 13, second low frequency amplifier C, phase detector 15, integrator 16.

A device for controlling the constancy of the electrical length of a microwave microwave circuit works in the following way.

Falling wave from generator 1

Enters the extended CWM truck 3 through the first directional coupler 2 and partially via it the first input of the first Lazovo: o / h tamper 7 as the reference signal. Likewise, an etched coupler, k, forks the suit of the incident wave from the output of the extended SW path 3 to the first input of the second phase discriminator 13. Pass the second directional jumper. The incident wave enters the payload 6 via the third directional coupler 5 and partially responds to it. Passing through the controlled phase shifter 2, the incident wave is modulated in amplitude by the modulator 11 and reflected. The reflected wave enters the extended microwave path 3 through a controlled phase shifter.

12, the third and second directional couplers 5, which branch a part of the reflected wave to the second input of the second phase discriminator

13, and through the first directional coupler 2 - to the second input of the ash phase discriminator 7. FR and the second phase discriminator - 7, H

 P(

amplitude-detec- tion, a practical sum-sum detector, yy - rep h the first amplifiers 1A and 8 iy /. eel south with the modulation frequency of the reflected wave. The voltage of the first amplifier 8 is equal to

U8 a-gabn- Vm Vw, +

+ vr cos (6j -L () go f (Vt,

where is the quadratic amlititch lx parameter. g "torus; tch is the index of the module1 of the module (AI,

, Vr /) - amplitudes of the reflected and incident waves arriving at the inputs of the DFSR base digit crematics 7 - amplitude modulation frequency,

the gain of the first amplifier 8,

i Qt - Phases of reflected and falling water, respectively, and

H - 7 (g + 2 +0 (

GDR 7 {- the electrical length of the extended spare means 3 7, the phase of the reflection coefficient from the modulator 1 1, -. pelvic shift in a controlled phase shifter 12. the voltage PV will be at

four

 f,. four

+ 7, + 9 (

4P

 , f + n -) / i (1)

V,

9i gu. -7g

+ 2f,

AND

 (± 2n - -),

(2)

gdg l t |, 1., .. Lll so that the result of the control% l does not depend on 72, it is necessary that when changing

 the sum of D-, + 2 | 3 remained constant. LL to ensure this condition, a PLL circuit is inserted, consisting of a controlled phase shifter 12, a third and a second directional ryvtvigel 5, a second phase discriminator 13, a second amplifier l i. detector detector 15 and ine 1 1

The voltage at the output of the second amplifier And is equal to

UW - amG +

R

+ Vr cos (67-2) 3cosJ2Mt,

de,

Vy, are the amplitudes of the reflected and r incident waves, entering r ix at the inputs of the second phase discriminator 13; & Z gain of the second amplifier 14,

Chg © Phase reflected and incident waves, respectively, and

-

1652937b

$ i 27, + (+ 7n + J) T + 9i +

I l /

+ (T2i + / 1 (A)

or

S, 2 + (± 2n - |) tf + d-f +

ten

+ (+ 2i + |) //,

(five)

where i, n 0,1,2 ..

Thus, the accuracy of controlling the electrical length of the extended microwave path 3 does not depend on changes in the phase of the reflection coefficient from the modulator 11, which are capable of adjusting the PLL.

U1,

B +2

&

The output voltage of the phase detector 15 is equal to

U15- -5 Vram6 7 +

+ Vracos () l,

where Vr is the voltage amplitude of the generator 10. The voltage zero will be emitted when

e „

g + 2

 ags1p-5g -K ± 2p +4) | (UGg2

or

e2 2 + 2} 3 + 9g - arcsin

Vrm

+ (+ 2p - bl.

A prerequisite for the accurate operation of the device for monitoring the constancy of the electric length of the extended microwave path is the performance of the Vr ratio. In addition, it is necessary that Vin7 Vf2 be ensured by selecting the coupling coefficient in the first and second directional couplers x 2, b. The UA maintains the voltage Ujg at zero, i.e.

Jz + 2 |, (T2p + ±) 1

Substituting (3) into (1) and (2), we obtain the conditions for equality of the voltage at the input of the indicator P

Claims (1)

Invention Formula A device for monitoring the constancy of the electrical length of the extended microwave path, containing serially connected, a microwave generator and the first directional coupler, the first phase discriminator, the first low frequency amplifier and the indicator, the second directional coupler and the payload, and the serially connected generator low frequency and reflection coefficient modulator, At the same time, the inputs of the first phase discriminator are connected to the outputs of the secondary channel of the first directional coupler, and the output of its primary channel is designed to connect the input of the studied extended microwave path, characterized in that, in order to improve the accuracy of control, the second phase discriminator is introduced in series, the second a low-frequency amplifier, a phase detector and an integrator, the output of which is connected to the control input of an HV controllable phase shifter inserted between the output of the module The torus of the reflection coefficient and the incident-oriented output of the secondary channel of the second directional coupler, the inputs of the second phase the discriminator is connected to the outputs of the secondary channel of the introduced third directional coupler, the output of the primary channel of which is connected to the input of the primary channel of the second 716529378 directional coupler, and the second input of the phase detector is designed to connect the output of the keys to the generator output with the like of the CRM-test under study, at the same frequency.