SU1021656A1 - Device for mechanism direction finder serviceability - Google Patents

Abstract

1. A DEVICE FOR MONITORING THE OPERATION CAPACITY OF RADIOKOMPAS, containing sequentially connected high-frequency oscillation generator and emitter, post-sequentially associated vocal amplifier, first mixer, intermediate frequency amplifier and amplitude detector and series-connected reference oscillator and second-tehle-gel amplifier. the reference input of the first mixer, and the high frequency amplifier input and the output of the amplitude detector are respectively the input and output A unit characterized in that, in order to reduce the monitoring time by coupling the frequency of the emitted oscillations to the passband of the intermediate frequency amplifier of the device, a controllable phase shifter and a phase discriminator are inserted in it, the output of the high frequency amplifier is connected to the second phase discriminator, and the generator output high-frequency oscillations are connected via a phase-3-controlled rotator with the second inputs of the second, (O mixer and phase discriminator, the output of which is connected to the controller from the input m controlled phase shifter.

Description

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2. An apparatus according to claim 1, characterized in that the phase iskrim nator contains a reference oscillator, a low frequency oscillator, an integrating {sequential circuit and successively sotsinonny differentiating circuit, a switch, a first mixer, a second mixer, an intermediate frequency amplifier, an amplitude ctector , a phase detector and a low-pass filter, the output of the integrated circuit being coupled to the second switch, the generator output

The invention relates to radio engineering and msmset to be used to monitor the operability of radio compasses, for example, of amplitude type, in which the bearing information is enclosed in the envelope.

A device for monitoring the operability of a radio compass, containing successively coupled high-frequency oscillator and emitter, serially connected high-frequency amplifier, first mix, 1-phase frequency amplifier and amplitude detector and serially connected reference oscillator and second mixer, the output of which connected to the reference input of the mixer, wherein the input of the high-frequency amplifier and the output of the amplitude detector are respectively the input and the output of the mouth Properties.

In this device, when monitoring the parameters of the radio compass, a high-frequency generator, which uses a standard signal generator, is tuned to the frequency of the selected receiver channel.

The monitoring is carried out on several frequency channels evenly distributed over the operating frequency band and radio compass Cl 1

However, tuning the generator to the frequency of the selected channel takes considerable time when monitoring the parameters of the radio compass.

The purpose of the invention is to reduce the monitoring time by matching the frequency of the emitted oscillations with the passband of the intermediate frequency amplifier of the device.

the low frequency is connected to the control input of the switch and the second input of the phase detector, and the output of the reference oscillator is connected to the reference input of the first mixer, while the second input of the second mixer is the first input of the phase discriminator connected between the inputs of the integrating and differentiating circuits The second input of the phase discriminator and the output of the lower frequency filter is the output of the phase discriminator.

The goal is achieved in that a device for monitoring the operability of a radio compass, comprising a series-connected high-frequency oscillator and an emitter, a series-connected high-frequency amplifier, a first mixer, an intermediate-frequency amplifier and an amplitude detector, and a series of reference oscillator and a second mixer, the output of which is connected to the reference input of the first mixer, and the input of the high-frequency amplifier and the output of the amplitude detector are correspondingly About the device input and output, a controlled phase shifter and a phase discriminator are introduced, the output of the high frequency amplifier is connected to the first input of the phase discriminator, and the output of the high frequency oscillator is connected via a controlled phase shifter to the second inputs of the second mixer and phase discriminato whose output is controlled from the input of the controlled phase transition.

The phase discriminator contains a reference oscillator, a low frequency generator, an integrating circuit and a series-connected differential circuit, a switch, a first mixer, a second mixer, an intermediate frequency amplifier, an amplitude detector, a phase detector and a low-pass filter, and the output of the integrating circuit is connected with the second input of the switch, the output of the low-frequency generator is connected to the control input of the switch and the second input of the phase de-vector, and the output of the generator, the reference oscillation oscillations With the second body mix master input, the second input of the second mixer is the first input of the phase misinterpreter, the interconnecting inputs of the integrating and aifferenpy {1) circuit are the second input of the fi ee disjunctator, and the output of the bottom frequency ramp is the output of the low frequency filter, and the subfan filter output is a subfan. phase discriminator. . FIG. 1 shows the structural electrical circuit of the proposed yct of the device {# 1 of FIG. 2 - phase discrimination torus. The device (Fig. 1} contains a generator of 1 high-frequency oscillations, an transmitter 2, an amplifier 3 of a high frequency, a first mixer 4, an amplifier 5 of intermediate frequency, an amplitude detector 6, a generator 7 of reference oscillations, a second mixer 8, a phase shifter 9 and phase discriminator 10 The phase discriminator (Fig. 2) contains a generator 11 of reference oscillations, a low-pass filter 12, a low frequency generator 13, a hand integrator oyu aesh 14, a differentiating circuit 15, a switch 16, a perfect mixer 17, a vsfy mixer 18, us1wtet 13 pr (1 "every night purity, AchSchite detector 2O; and J) a nitrogen detector 21. The device operates on the left side. The high-frequency signal Wg from the output of generator 1 goes to emitter 2. This signal (1) is defined by (U) tVtfJ, (I where Uq - the amplitude of the sieve of the geierato c / d - the initial phase. By means of the radiator, an electromagnetic field is created in the vicinity of the antenna system to an F-controlled radio compass, imitating the arrival of a wave from a given direction. The signal from the output of the antenna system through the high-frequency amplifier 3 is fed to the first input of the mixer 4. The signal of the generator 1 from its additional powerful output through the controlled phase shifter 9 also goes to the first input of the mixer 8. The second input of the mixer 8 receives the signal of the generator 7 operating on frequency tu. "0 The signal of the generator 7 (Uj.) is determined by the expression, U UrCOs (), (2Г where Ug is the input signal of the generator signal, the phase is started. In mixer 8, a series of signals arriving at its inputs occurs. Signal at the output of the mixer (.) R cases tc by the expression) X Cf) (FM, -,. (and,)) (.), (3) where V is the phase shift introduced by phase phasor 9, Thus, at the output of the dummy 8, there are harmszhich frequencies (uig-tup with initial phase (tg Y - tf) and frequency components (Na + with initial phase {Cha +%). In the antenna system of the controlled radio comp, the fifth signal is amplified in amplitude. The signal at the antenna output systems (U} is determined by the expression and U tl + wcosfltfcosrui-i + y, (4) i where (J is the signal amplitude; H (. Is the initial phase; Si is the antenna jamming frequency; mr — mic.) In mixer 4, the UCM multiplies c is multiplied. The signal on the mixer slope () is defined with {a). ) t - (. P -. 4, c, - P -. D co5 (2u, - wjt.. - VV)) t.). pce A - (i- mcosSl-b). The sig al from the output of the mixer 4 is fed to the amplifier 5 about the transient frequency (U FC), tuned to the frequency and, -. The output of the IFA () is defined by the expression (: 4Acos w i + (). - Hg s, i.e. in the output signal Uf, missing the components of the frequency 2uip Schr. After simple transformations, the final expression is al (4o-4 4), t (V) (tfQ-4 + 4j (1 mcos "t) cos (. |. (1) As can be seen from expression (7), the output of the IF amplifier 5 is the voltage Ujp with amplitude Bj modulated amplitude by frequency signal I with modulation depth MX The amplitude of the signal at the output of the IFA 5 is determined by the expression (4o-4c + V). (As can be seen from (8), the amplitude B depends on the magnitude of the phase difference and - 4. Oh, what is provided by the phase shifter 9, controlled by the output signal of the phase discriminator 10. Thus, as a result of the conversion, the spectrum of the informative signal is transferred to the frequency at a fixed frequency and; p In this case, the frequency conjugation of amplifier and oscillator 1 is performed automatically. The control signal of the phase shifter is formed as follows: From the output of the phase shifter 9, the signal U, defined by expression (1) shifted by the phase angle H introduced by the phase shifter 9, goes to the outputs of the integrator and Differentiating circuits 1 and 15. The outputs of these circuits by means of a switch 16, controlled by a low-frequency generator 13, periodically (with frequency S 1) connect the input of the mixer 17. Without taking into account the signal conversion caused by the switching signal at the mixer input 17, and without phase signal introduced by the chains 14 and 15, the signals at the outputs of the mixers 17 and 18, respectively, coincide with the output signals of the mixers 8 and 4 and are determined by the expressions (3) and (5), and the signal at the output of the ASD 19 is determined by the expression (7 ). The amplitude of the signal in the VOD code is 19 (it is dependent on the expression (8) and depends on the magnitude of the phase difference (RR + V - a, taking into account the additional phase shift (+ R)) introduced by the chains 14 and 15, the amplitude of the signal at the VPC 19 output depends on phase difference (4 + V-4f). As a result of a periodic change in the sign of the additional phase shift, the output of the PRC 19 output signal is additionally modulated in amplitude by the frequency signal at the switching frequency of the switch 16 ... In this case, amplitude modulation is absent only at (H + V-4j ..0). Amplitude modality envelope This is highlighted at the output of the amplitude detector 20. In phase detector 21, the phase of the envelope is compared with the reference signal of the generator 13. The output voltage of the detector 21 filtered by filter 12 controls the phase shifter 9. The magnitude and sign of this voltage determine the value and the sign of the required phase shift of the signal at the inputs of mixers 8 and 17, introduced by the phase shifter to perform the equality -jH-H - f K) to obtain, according to expression (8), the maximum signal at the output of the amplifier, 5. Signal ir, c detects detector 6 and is input to the signal processing unit posletsetektortoy radiocompass controlled. In working out the radio compass of a given j bearing, it is judged on its working capacity and parameters. Thus, in the proposed device for monitoring radio compasses, in contrast to the known, automatic frequency coupling of the high-frequency generator, test signal and amplifier, intermediate frequency is provided, which reduces the monitoring time.

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Claims (2)

1 .. DEVICE FOR MONITORING THE OPERATING EFFICIENCY OF THE RADIO COMPASS, comprising a series-connected high-frequency oscillation generator and a radiator, a series-connected high-frequency amplifier, a first mixer, an intermediate-frequency amplifier and an amplitude detector, and series-connected a reference oscillation generator and a second mixer, the output of which is connected to the reference input of the first mixer, and the input of the high-frequency amplifier and the output of the amplitude detector are respectively the input and output of the device a, characterized in that, in order to reduce the monitoring time by pairing the frequency of the emitted oscillations with the passband of the intermediate-frequency amplifier of the device, a controlled phase shifter and a phase discriminator are introduced into it, the output of the high-frequency amplifier connected to the first input of the phase discriminator, and the output of the high-frequency generator oscillation is connected through a controlled phase-§ rotator with the second inputs of the second mixer and phase discriminator, the output of which is connected to the control input second phase shifter. S and „1021656 of FIG. 2 2. The device according to claim 1, characterized in that the phase discriminator comprises an oscillation support generator, a low frequency generator, an integrating circuit and a differentiating circuit connected in series, a switch, a first mixer, a second mixer, an intermediate frequency amplifier, an amplitude detector , a phase detector and a low-pass filter, the output of the integrating circuit connected to the second input of the switch, the output of the low-frequency generator connected to the control input of the switch and the second input of the phase detector, and you the oscillator of the reference oscillator is connected to the reference input of the first mixer, while the second input of the second mixer is the first input of the phase discriminator, the interconnected inputs of the integrating and differentiating circuits are the second input of the phase discriminator, and the input filter nk '. of the lower frequencies is the output phase discriminator. ί