SU1365360A1 - Method of remote determination of frequency components of composite transmission line - Google Patents

Abstract

The invention relates to telecommunications. The purpose of the invention is to increase the reliability of the determination. The essence of this method is to make separate measurements of frequency x-k transmit amplifiers and receiving intermediate points of a composite transmission line. This allows the computer to calculate the necessary amplitude-frequency x-ki and rpynhoBoro correction of the delay time of the intermediate links at the level of the serviced amplifying point when calculating the frequency x-k component paths. At the same time, all measurements of frequency x-k are made from one point (control center) with the use of high-performance computing equipment. Given il. the implementation of the device that implements this method, and a variant of one of its blocks. 2 Il.

Description

one

The invention relates to telecommunications engineering and can be used to remotely determine the frequency characteristics of any of the portions of a composite transmission line.

The purpose of the invention is to increase the reliability of the determination.

Figure 1 shows the structural electrical circuit of the device implementing the proposed method; Fig. 2 shows an embodiment of a block puppy connection.

A device that implements the proposed method contains, at the end point 1, a computational unit 2, a display 3, a measurement unit 4, a detector 5, fixed frequency synthesizers 6, automatic switches 7, a mixer 8, a service command sensor 9, at each intermediate point 10, - 10 ; unit 11 pluggable connections, amplifiers 12 and 13.

Wheeled connection unit 11 contains (Fig. 2) decoders 14 and 15, timer 16, elements 17 and 18 of coincidence, switches 19 and 20, unit 21 of signal conversion, register 22 of service commands.

In contrast to the known method of the proposed method, the frequency characteristics of transmit amplifiers and intermediate points of a composite transmission line are measured separately, which makes it possible for computer to calculate the necessary amplitude-frequency response (AFC) and group delay time (GDZ) of intermediate links at the PMO level when calculating the hundredth characteristics of the composite paths. Moreover, all measurements of frequency characteristics are made from a single point (control center) using high

- five

ten

3653602

Simultaneous connection of the required loop at intermediate points 10, - lOj of the composite line, transmitting, alternately or selectively, the output of amplifier 12 is connected to the input of amplifier 13 using the Loop I mode using the block 11 loop connections, and the Loop II mode using the the same block 1I is made, the same connection of the output of amplifier 12 to the output of amplifier 13.

After connecting the necessary

15 loops at intermediate points 10 (- 10; composite transmission lines also, at commands from computational unit 2, connect the synthesizer 6 fixed frequencies to the automatic switch 7 for transmitting fixed preset frequencies to the line at a constant level. At reception synchronously with programmed control with transmission, 25 fixed-frequency signals are extracted using a similar synthesizer 6 frequencies and an automatic switch 7, as well as using a mixer 8, detector 5, and then from ep dissolved frequency-dependent characteristics of the composite units in the block 4 and the measurement results of measurements on the issue of computational units 2, wherein the measurement after suitable processing in the desired form for an operator displayed on the display 3,

Unit 1 shshifnyh connections works as follows.

From the output of amplifiers 12 intermediate

40 points 10, - 10; the service pulse code sequences through the signal conversion unit 21 are sent to the service command register 22, then decrypted to

35

coprocessor-accurate tech-45 tori 14 and 15 respectively modes

Train I and Train II. The pulses from the outputs of the decoders trigger a timer 16, which generates a resolution signal for elements 17 and 18 of match, which reduces the time taken to measure the characteristics and commissioning of the composite paths. At the same time, the service personnel is reduced due to the automated calculation of the necessary operations on correctors, the composite path.

The device that implements the method works as follows.

On command from the end point 1, on which the computing unit 2 and the service command sensor 9 are located, which generates the code combinations necessary for the spectrometers 14 and 15, respectively, of the modes

Train I and Train II. The pulses from the outputs of the decoders trigger a timer 16, which generates a resolution signal to the elements 17 and 18 of the corresponding parameters of the switches 19 and 20 respectively.

55 Timer 16 generates permission signals depending on the number of the intermediate section of the transmission line and connects the corresponding loops only for the time of measurement frequency

3,

characteristics of this intermediate line section.

The measurement of frequency characteristics consists in the sequential or simultaneous measurement of the recommended GIET parameters. For example, to measure the frequency response of a- (co, ..., p) group paths, it is necessary to measure the residual amplification of the four-way network (which in this case are amplifiers 12 and 13 together with line-cable structures) in the frequency range f, ,, ..., f, the input and output of which is spatially measured. The amplification of the path at the frequency f at the level-, not P, at its input is determined by the discharge of H. 0.5 1n (P2 / P,), where P is the power at the resistance of the SII, equal to the resistance of the synthesizer; Р U, / ZH - power per amplifier with load resistance

2ts.

Then

“.; P1 1;

Similar measurements can be made for other frequency characteristics of the composite transmission line, namely the uneven frequency response & a / a (co, ..., to p) nonlinearity of the frequency response, the deviation of the group time of deceleration in (O |, ..., co), etc.

Measurement of frequency characteristics () and; write to the system of equations

Y, V, x;

2 s, x;

Y, - v, V ,, - x;

Y4 - V, ((2.

Y,

2i- 1

 .,. x; .rf; x

V; (with, .. .coj; b ((j ,. ..co "); ...

... ((,...four)) ,

where n 1,2, ..., ha. frequency - frequency characteristics of amplifying sections of the transfer of intermediate points of the composite transmission line.

653604

F; F / a (q ... Oj; b (co, ... wj;

-f (CO .... COJ},

d

 5 where n l, 2, ..., m

Ф, - frequency characteristics of amplifying sections for receiving intermediate points of a composite transmission line;

X (and, ..., “) and Y (a,“ „) 10 signals at the input and output of the measured four-terminal networks.

Claims (1)

Invention Formula 15 The creation of a remote determination of the frequency characteristics of a composite transmission line, consisting in transmitting test signals X (co) from an end point, highlighting 20 of these signals at intermediate points and definitions of frequency characteristics of intermediate points of a composite transmission line, characterized in that, for the purpose of higher accuracy, after separating at intermediate points, the test signals are transmitted to the end point from the input and output of the corresponding intermediate point 30 their switching, at the terminal point, measure the parameters of Y, the (co) received test signal, memorize them, and the frequency characteristics of the intermediate points of the composite 35 transmission lines (p; (co) and J (u) are determined from the system of equations Y, - xv; j Yj "H.f;., -, 40 Y, - X- (f, V.CP, i  X. (, .. l, .P,.,.... , - X-nVi-n P; -, YI; - X-nc,) -, - PF; , 45 where i is the number of intermediate points, according to the formulas YI .--.  XP (;.,. ПФ;., Q, - 50 F;  xp gftt Perezhat "