SU784525A1 - Angle discriminator - Google Patents

Abstract

1. ANGULAR DISCRIMINATOR containing a phase shifter, a frequency auto-tuning unit, a reference frequency block, a series-connected antenna unit, a sum and difference signal shaping unit, a first mixer, a first bandpass filter, a first addition unit, a receiver, a narrowband filter, a phase detector, a first filter audio frequency and the first synchronous detector and the second mixer, the second band-pass filter and the first balanced modulator, the output of which is connected to the second input of the first block, are connected in series Moreover, the second output of the sum and difference signal generating unit is connected to the input of the phase shifter, the first and second outputs of the reference frequency unit are connected respectively to the second input of the first synchronous detector and the second input of the first balanced modulator, and the output is connected to the second input detector, the output of the narrow-band filter is connected to the input of the automatic gain control of the receiver directly, and to the second i input of the first mixer through a frequency auto-tuning unit, which is soup, and in that, for the purpose povsheni accuracy administered directional coupler v.toroy balanced modulator, the second adding unit and a series connection of the second filter. an audio frequency, a second synchronous detector and a controlled phase shifter, while the second addition unit is connected between the output of the phase shifter and the first input of the second mixer, the third output of the reference frequency unit is connected to the second input of the second addition unit via a second balanced modulator, the second input of which is connected to the first the output of the sum and difference signal shaping unit through a directional coupler, the second output of the first synchronous detector is connected to the input of the second audio частоты frequency filter, the fourth in the output of the reference frequency unit is connected to the second input (I of the second synchronous detector, and the height of the course of the frequency-locked loop unit is connected to the second input of the controlled phase shifter, the output of which is connected to the second input of the second mixer h. 2. The discriminator according to claim 1, T T l00 The phase detector contains a connected phase shifter and a multiplier in series, with the first and second inputs and the output of the phase detector switching on the phase shif- ter input and the second input of the multiplier and its output, respectively. V 3. The discriminator of claim 1, wherein the synchronous detector comprises a series-connected multiplier and a low-pass filter, the first and second inputs and the first and second outputs of the synchronous detector, respectively, the first and second inputs of the multiplier, output low pass filter and multiplier output.

Description

The invention relates to radio engineering and can be used in monopulse radar and radio navigation stations. .

Known angular discriminator,.

containing a phase shifter, a frequency auto-tuning unit, a reference frequency unit, a series-connected antenna unit, a sum and difference signal shaping unit, a first mixer, a first band-pass filter, a first addition unit, a receiver, a narrowband filter, a phase detector, a first sound filter

The first synchronous detector and the second mixer, the second band pass, the filter and the first balanced modulator, the output of which is connected to the second input of the first addition unit, and the second output of the shaping unit of the total and differential signals, connect the first and second the outputs of the frequency block are connected respectively to the second input of the first synchronous detector And the second input of the first balanced modulator, the output of the receiver is connected to the second input of the phase detector, 1XO A narrowband filter is connected to the input of the automatic gain control of the receiver directly,

and with the second input of the first mixer through the automatic frequency control unit,.

One: aka known device has a low accuracy of angular measurements,

due to parasitic phase shifts. signals in bandpass filters, especially in a narrowband filter

extraction of the total signal, as well as the imperfection of the unit for the formation of the total and differential signals. . The purpose of the invention is to increase the accuracy. : ..- ,; :,. /:; . ;;; -;

To do this, into an angle discriminator containing a phase shifter, a frequency auto-tuning unit, a reference frequency unit, a series-connected antenna unit, a sum, measurement, and difference signal generation unit, a first mixer, a first band pass filter,. the first addition unit, the receiver, the narrowband filter, the phase detector, the first audio frequency filter and the first synchronous detector and the second mixer, the second mixer, the second band-pass filter and; the balanced balanced modulator whose output

is connected to the second input of the first addition unit, while the second outgrowth of the sum and diversity signal formation unit is connected to the input

phase shifter, the first and second synchronizers of the soy frequency block ;; Inns, respectively, with the second input of the first synchronous detector and the second input of the first balanced modulator, the receiver output is connected to the second input of the phase detector, the output of the narrow-band filter is connected to the input of the automatic gain control of the receiver, and to the second input of the first mixer through the frequency self-tuning unit, introduced. directional coupler, second balanced modulator, second addition unit and series-connected

0 a second audio filter, a second synchronous detector and a controlled phase shifter, while the second addition unit is connected between the output of the phase shifter and the first input of the second

5 mixer, the third output of the reference frequency unit is connected to the second input of the second addition unit through the second balanced modulator, the second input is connected to the first output of the unit

0 forming the sum and difference signals via a directional distractor, the second output of the first synchronous detector is connected to the input of the second audio frequency filter, the fourth output of the frequency block is connected to the second input of the second synchronous detector, and the output of the frequency control unit is connected to the second input of the controlled phase shifter, The course of which is connected to the second .in, the house of the second mixer, the phase detector, the torus contains sequentially on:

 phase shifter and multiply, at. this first and second inputs and

5 The code of the phase detector is respectively the input of the phase shifter, the second input of the multiplier and its output, the synchronous detector contains; sequentially connected multipliers 50, hoist and low pass filter, the first and second inputs of the synchronous detector, respectively, the first and second inputs of the multiplier, the output

55 low pass filter and pen output; multiplier.

Fig, 1 prg-gadena: structural

electrical circuit of the proposed device; in fig. 2 - diagrams explaining the operation of the proposed device. The device contains a phase shifter I, a frequency auto-tuning unit 2, a block of 3 reference frequencies, an antenna unit 4; block 5 of forming the sum and difference signals, the first mixer 6, the first band-pass filter 7, the first block 8 of addition, the receiver 9, narrow-band filter 10, phase detector II, the first filter 12 of sound frequency, the first synchronous detector 13, the second mixer 14 , the second band-pass filter 15, the first balanced modulator 16, the directional coupler 17, the second balanced modulator 18, the second addition unit 19, the second audio filter 20, the second synchronous detector 21, the controlled phase shifter 22, the phase detector 11 includes a phase shifter. 23 and the multiplier 24, the first and second synchronous detectors 13, 21 comprise a multiplier 25 and a low pass filter 26. Angular discriminator works as follows. . The input signals received by the antenna unit 4 are fed to the inputs of the sum and difference signal generating unit 5, with the result that the sum and difference signals and (0) COSuJt U: U- (0) (6)) are outputted at its outputs. (2) The sum signal (1) is fed to the first input of the first mixer 6, the second input of which receives the output signal of the frequency control 2 and „cost (cJ-4o) t -vi. . (3) as a result, at the output of the first bandpass filter 7, the sum signal of the intermediate frequency Uj is extracted. (0) cos (4pt + H + uX, (4) which is fed to the first input of the first adding unit 8. At the same time, part of the energy of the total signal through the directional coupler 17 is fed to the input of the second balanced modulator 18, to the reference input of which from the output of block 3 of the reference frequencies, the oscillation 2 Uj, cosS} t enters. As a result, the oscillation with a suppressed carrier is formed at the output of the modulator 18 (see Fig. 2a). -.a) t, which is fed to the input of the second addition unit 19, to the other input of which through the phase shifter 1, ensures the phase rotation on / 2, a difference signal is received. As a result, a mixture of the difference and modulated sum signal (6i) t + 4 (6i) + + 2K Uj. (6l) coscJt cos is formed at the input of the second mixer 14, which is multiplied in the second mixer 14 with the output signal an automatic frequency control unit 2 having passed the controlled phase shifter 22 (uJ-u;,; t-h. J. (7) At the output of the second band-pass filter 15, the signal (e) S in i4pt + if (e) + v + to Uj. (0) c.os {uJ t + vf +., (8) which is fed to the input of the balanced modulator 16, to the second input of which from the output of block 3 receives the oscillation 2and „cos. As a result, at the output of the first balanced modulator 16, a signal is generated with a suppressed carrier (see n. 26) .. It (Q) sinLu) (®) + f + f + + dV, Jcos а t + 4KU (0) cpsHpt- - f +%, e + + d 5Jcos cos Sl, t, which is fed to the second input of the first addition unit 8. Thus, the input of the receiver 9 receives the signal C08 („,„ .t + M + AV,) +. () + 2U- (6 8in j pt + 4 (6) + 4 l fJcos, 4KUJ- (0), pt + H, c6sa, t,. (10)

Claims (3)

. one . ANGULAR DISCRIMINATOR, comprising a phase shifter, a frequency lock block, a reference frequency block, an antenna block in series, a sum and difference signal generating block, a first mixer, a first bandpass filter, a first addition unit, a receiver, a narrowband filter, a phase detector, a first sound frequency filter and a first synchronous detector and a second mixer in series, a second bandpass filter and a first balanced modulator, the output of which is connected to the second input of the first addition unit, at this ohm - the second output of the sum and difference signal generating unit is connected to the input of the phase shifter, the first and second outputs of the reference frequency block are connected respectively to the second input of the first synchronous detector and the second input of the first balanced modulator, the output of the receiver is connected to the second input of the phase detector, the output of the narrow-band filter is connected with the input of automatic gain control of the receiver directly, and with the second '| the input of the first mixer is through the automatic frequency control unit, so that in order to increase the accuracy, a directional coupler, a second balanced modulator, a second addition unit and a second filter connected in series are introduced. sound frequency, a second synchronous detector and a controlled phase shifter, while the second addition unit is connected between the output of the phase shifter and the first input of the second mixer, the third output of the reference frequency unit is connected to the second input of the second addition unit through the second balanced modulator, the second input of which is connected to the first output of the unit forming sum and difference signals through a directional coupler, the second output of the first synchronous detector connected to the input of the second filter frequency _{of the} sound, a fourth output b eye reference frequency is connected to the second input of the second synchronous detector and an output of the frequency locked loop unit coupled to a second control input of the phase shifter, the output of which soedi'nen a second input of the second mixer. 2. The discriminator according to claim 1, wherein the phase detector comprises a phase shifter and a multiplier connected in series, wherein the first and second inputs and the output of the phase detector are, respectively, the phase shifter input, the second multiplier input, and SU „„ 784525 its exit. · H · 3. The discriminator according to claim 1, characterized in that the synchronous detector comprises sequentially connected multiplier and a low-pass filter, while the first and second inputs and first and second outputs of the synchronous detector are the first and second inputs of the multiplier, the output is a low-pass filter and - output of the multiplier.