RU758U1 - Phase corrector - Google Patents

Abstract

1. Phase corrector, characterized in that a delay block and a linear block are introduced, the inputs of which are interconnected and are the input of a phase corrector, a frequency multiplier by alpha, which is connected to the output of the delay block, and a frequency multiplier by beta, which is connected by input to the output of the linear block, the mixer, the first and second inputs of which are connected to the outputs of the frequency multiplier by alpha block and the frequency multiplier by beta, as well as the frequency multiplier by y, the input of which is connected to the output mixes spruce, and the output is the output of the phase corrector, while the linear block is made with the operator transfer coefficient K (p) = k * [Z (p)] ^ (1 / n) ,. where k is a non-zero coefficient of proportionality ,. Z (p) is the operator transmission coefficient of the corrected path, n is a non-zero positive integer. 2. The corrector according to claim 1, characterized in that the frequency multiplier by alpha, the frequency multiplier by beta and the frequency multiplier by gamma are such that alpha = beta * [1 + n ^ -1], gamma = n / beta.

Description

(54) PHASE CORRECTOR

FIELDS OF TECHNOLOGY AND USE

The proposal relates to communication technology and can be used in transmitting and receiving devices of communication systems with angular (frequency, phase) modulation (UM) to correct the phase distortion arising in the linear frequency-selective paths of these systems.

LEVEL OF TECHNOLOGY, STATE OF THEORY

Questions of the theory and technique of phase correction are considered in many works, in particular, in // TOI // and // T02 //.

FORMULATION OF THE PROBLEM

The traditional phase CORRECTORS are linear systems with the characteristics of the group delay time (GD), opposite to the characteristics of the GW of the corrected paths. If it is required to ensure high accuracy of correction, the traditional CORRECTOR turns out to be a complex linear system synthesized for a particular path, which is almost impossible to rebuild to correct the characteristics of the GVZ, which is different from the original. Tunable phase CORRECTORS are also known, which can be used to correct the same characteristics of the GWZ with different parameter values, opiaKO such CORRECTORS cannot provide high accuracy of correction. It is of interest to search for such technical solutions that could be used to correct paths with arbitrary characteristics of the GVZ, and which would ensure high accuracy of the correction. This proposal is aimed at a particular solution to this problem.

-Sff if

-6

ANALOGUE // A //

A phase CORRECTOR synthesized in a linear circuit consisting of inductors and capacitors is designed to correct, with a given accuracy, the characteristics of the GWZ of a particular band-pass filter. Correction accuracy can be improved by complicating the CORRECTOR circuit diagram, however, if the simplest such CORRECTORS can still be tuned within certain limits using tuning inductances and capacitors, then more advanced circuits can be effectively used exclusively to correct the circuit for which they are synthesized, i.e. e. are non-universal, complex, difficult to configure linear systems.

PROTOTYPE // P //

Closest to the proposed is the CORRECTOR of the GC characteristics (Fig. P), containing a series-connected input adder P1, the input of which is the input of the CORRECTOR of the characteristics of the GVZ, and an adjustable band-pass filter P2, as well as the output adder OF, the output of which is the output of the CORRECTOR of the characteristics of the GVZ, the first input of the output adder ПЗ is connected to the first input of the input adder П1, and, finally, the adjustable attenuator П4 is connected between the output of the adjustable band-pass filter P2 and the second input of the output FROM adder, wherein the input and output of the variable attenuator P4 are connected to the third input of the output adder and the PP to the second input of the adder input A1 respectively.

The indicated CORRECTOR has an L-shaped characteristic of the GWZ, opposite to the traditional I / -shaped characteristic of bandpass filters. In addition, there is the possibility of independent and smooth adjustment of maxil (mind GVZ and the central frequency of the maximum

-13- GVZ, i.e. The prototype is a universal tunable phase CORRECTOR.

Prototype

The goal-oriented phase correction is ensured in the event that the sum of the characteristics of the GVZ CORRECTOR and the corrected path forms a horizontal line. Therefore, to ensure high accuracy of correction, it is necessary that the shape of the characteristics of the GVZ of the CORRECTOR be possibly more closely connected with the trout of the characteristics of the GVZ of the path. But the shape of the adjustable L-shaped characteristic of the prototype GBZ depends on the transfer characteristic of the adjustable band-pass filter P2, and therefore it can in no way be correlated in detail with the (Y-shaped characteristics of the GBZ of various types of bandpass filters used in communication channels.

In other words, the accuracy of the phase correction provided by the prototype is significantly limited.

PURPOSE OF THE OFFER

The purpose of this proposal is to improve the accuracy of correction.

SUMMARY OF THE OFFER

The goal is achieved by the fact that in phase corrector

Introduced

a delay block and a linear block, the inputs of which are the input of the CORRECTOR, a frequency multiplier by JL connected by the input to the output of the delay block, a frequency multiplier by y8, connected by the input to the output of the linear block, a mixer, the first and second inputs of which are separately connected to the outputs of the multiplication block frequencies on

-Chi of the frequency multiplier by B, respectively, and the frequency multiplier by y, whose input is connected to the output of the mixer, and the output is the output of the CORRECTOR.

In this case, the linear block is made with an operator transmission coefficient

k (p) / Ztp) j

where is the coefficient of proportionality different from zero, Z (p) is the operator transmission coefficient of the corrected path,

D is a positive integer other than zero, and the blocks of frequency multiplication by os, y8 and are made so that

. , (I)

aH - | -. (2)

The leading technical idea of the proposal is that the phase correction with high stiffness is carried out using a linear unit that includes links identical to those of which the corrected path consists.

Proof of Compliance with the Criteria of the Invention

a) CONFIDENCE OF TECHNICAL SOLUTION

Consideration of the proposal shows that none of the mentioned blocks of the CORRECTOR can be excluded without impairing the operability of their entire set as a whole, i.e. It is necessary and therefore essential.

However, the use of the totality of these blocks ensures the fulfillment of the purpose of the proposal, expressed by its generic attribute (name) .. Therefore, the proposed proposal is a complete technical solution to the task.

r-. .

b) NEW

The features of the proposal listed above represent its differences from the prototype, the existence of which proves the novelty of the proposal.

c) (SIGNIFICANT DIFFERENCES

The study of these differences by the method of alternately replacing or eliminating the functions performed by them proves the existence of a clear cause) of a causal relationship between them and the result of using the proposal. In addition, while there are no longer technical solutions where the use of these differences allows us to achieve a similar result. Therefore, these differences are significant,

d) HALF-JUG EFFECT

First, we emphasize that the proposed CORRECTOR, like the prototype, is universal. For use in a particular path in most practical situations, it is enough to include filters identical to those used in this path and introduce phase distortions in the structure of the CORRECTOR as a linear block. In other words, in a repentant separate case, it is only necessary to compose the CORRECTOR from the already worked out, and often available nodes.

However, the accuracy of the correction prototype is fundamentally inferior to the proposed device. In the CRITICISM section of the PROTOTYPE, it was shown that the detailed connection necessary between the characteristics of the prototype detector and the characteristics of the different types of bandpass filters used in correlated communication channels, necessary to ensure high accuracy of phase correction, cannot be realized. At the same time, the indicated relationship between the characteristics of the GVZ of the linear block and the corrected path always occurs when using the offer

CORRECTOR. An explanation of how the proposed device provides inverse phase correction is given below in the FUNCTIONING section.

The above proves the creation of a positive effect, reflected in the purpose of the proposal.

LIST OF FIGURES

In Fig. P shows a functional diagram of the prototype, in Fig. 1 diagram of the proposed CORRECTOR.

IMPLEMENTATION OF THE OFFER

Phase KORRE1SGOR (Fig. 1) contains a delay block I, a linear block 2, a frequency multiplication unit 3 by a, frequency multiplication unit 4 by an A mixer 5 and a frequency multiplying unit b by y. The connections between the blocks and their characteristics are described above and in the forerunner of the invention.

PERFORMANCE OF UNKNOWN SIGNS

Linear block 2 may be, for example, a band-pass filter identical to those included in the corrected path.

The mixer 5 is equipped with an output filter that allocates a differential frequency.

Each of the blocks 3,4 and b of frequency multiplication by n0 ,, (u can be either a frequency multiplier if L (/ 5, J) I, or a frequency divider if o (,, V) C1, or a direct connection of its input with an output if «/ (, у) 1.

The delay unit I is configured so that the signal delays in the parallel channels of the CORRECTOR are the same.

V- - -

OPERATION

We will analyze the work of the CORRECTOR by making the following two assumptions. First, after a half-wave, the signal delays in the parallel channels of the CORRECTOR are the same; they, as well as the signal delays in the corrected path, can be ignored without prejudice to the content of the analysis.

Secondly, we assume that the phase distortions that need to be corrected are small, so

, (3)

where Y i) is the undistorted phase of the transmitted signal, and

-r (i) (t),

(jy is the carrier frequency,

r (Zy is the modulated component of the phase with zero mean, (th is the phase distorted in the path, and the bar above means time averaging.

Inequality (3) is true in most practical situations. Suppose that one of the / 2 identical links of the equivalent circuit of the corrected path, having an operator transfer coefficient Z (p), adds to the phase V () of the signal acting at its input a distortion product l. Then, if (3) is true, we can approximately assume that when a signal with phase passes through the corrected path, each of the 2 mentioned cascaded links of the latter adds the term Y to the signal phase. If the phase of the signal at the input of the CORRECTOR

J (zf) Czf) (zf), (4)

 the product of phase distortion in the path to the CORRECTOR, then the phase of the signal at the output of unit 3 of frequency multiplication by

-wp

/ J r (i) (i), (6) - at the output of block 4 of frequency multiplication by. (i), (at the output of mixer 5, where the difference frequency is allocated, () r (f) -rft (t), (8 is at the output of frequency multiplication unit b by Y and, finally, at the output of the path Гг)) 40 where) is the product of phase distortion in the path after KORRESSTOR. Substituting (4) into (5) and (6), (b) into (7), (5) and (7) into (8), (8) into (9), and (I), (H) and (9) in (10) and taking into account that on the basis of (3) {- (i) (), after the transformation we get that YrifJ nt), i.e. the phase of the signal that passed the corrected path with the CORRECTOR included in it is practically not distorted. Thus, it was found that the proposed device provides an effective phase correction. We also note that if the CORRECTOR is turned on at the output of the corrected path, then the frequency multiplier by block b may not be used, since the signal at the output of mixer 5 already has a corrected phase, which in the general case is not equal to, but proportional to, the original one. Such a signal can directly be subjected to angular demodulation. r (} KVi (f), (9)

R p l (56) SOURCES OF INFORMATION // TO // - THEORY, TOI. Trifonov I.I. Calculation of electronic circuits with specified frequency characteristics. M.: Radio and Communication, 1988. T02. Silvinskaya K.A., Golyshko Z.I. Calculation of phase and amplitude correctors. M.: Communication, 1980. // A // - ANALOGUE see // TOI //, p. 81, Fig. 2.44. // P // - PROTOTYPE Kissel V.A., Ryzhov V.A. Corrector of characteristics of group time idle communication channels. A.S. USSR No. 1069173A, CL H04B 3/04, decl. 12/03/80, publ. 01/23/84, bull. Number 3. (71) APPLICANT14IR (Radio) (OKPO code II8I480). Before and after the applicant: leading the group .l / / r. atentsBE-: research nlU Shvlga T.M. / (72) AUTHORS: / V.M. Dorofeev CZicy L. B. Krol fevj /

Claims (2)

1. Phase corrector, characterized in that a delay block and a linear block are introduced, the inputs of which are interconnected and are the input of a phase corrector, a frequency multiplier by alpha, which is connected to the output of the delay block, and a frequency multiplier by beta, which is connected by input to the output of the linear block, the mixer, the first and second inputs of which are connected to the outputs of the frequency multiplier by alpha block and the frequency multiplier by beta, as well as the frequency multiplier by y, the input of which is connected to the output mixes spruce, and the output is the output of the phase corrector, while the linear block is made with the operator transfer coefficient K (p) = k * [Z (p)] ^ (1 / n) ,. where k is a non-zero coefficient of proportionality ,. Z (p) is the operator transmission coefficient of the corrected path, n is a non-zero positive integer. 2. The corrector according to claim 1, characterized in that the frequency multiplier by alpha, the frequency multiplier by beta and the frequency multiplier by gamma are such that alpha = beta * [1 + n ^ -1], gamma = n / beta.