RU1818536C - Indication device - Google Patents

Abstract

The invention relates to instrumentation w. May be used to indicate rapidly changing processes. The goal is to expand the functionality by automatically measuring and recording the main parameters of the received signal with combined linear frequency modulation and multiple phase shift keying. The device comprises a sweep generator 1, a first CRT 2, an antenna 3, a broadband amplifier 4, a first frequency detector 5, a first and second differentiating circuit 6 and 7, a mixer 8, an intermediate frequency amplifier 9, a first key tO, a first eight frequency multiplier 11, a first band-pass filter 12, a first eight frequency divider 13, a second band-pass filter 14, a multiplier 15, a third band-pass filter 16, a second frequency multiplier 17 for eight, a fourth band-pass filter 18, a second frequency divider 19 by eight, a fifth band-pass filter 20 phase d detector 21, low-pass filter 22, control signal driver 23, controlled delay element 24, detector 25, delay element 26, second key 27, search unit 23, local oscillator 29, second frequency detector 30, phase shifter 31 by 90 degrees, generator 32 reference voltage, the second and third CRT 33 and 34. narrow-band filter 35, amp. a steel detector 36, a counting pulse generator 37, a first unipolar valve 38, first and second matching elements 39 and 40, first and second counters 41 and 42, a first arithmetic unit 43, a recording unit 44, a limit amplifier 45, and a third differentiating circuit 46 , the second unipolar valve 47, the phase inverter 48, the third and fourth matching elements 49 and 50, a reversible counter 51, a third counter 52 and a second arithmetic unit 53. 1 ill. w fe 00 00 ate about

Description

The proposed device relates to indicator and recording devices and can be used to indicate rapidly changing processes, in particular, to visually and automatically analyze and record the parameters of complex signals with combined linear frequency modulation and multiple phase shift keying (LFM-MPSK).

The purpose of the invention is to expand the functionality by automatically measuring and recording the main parameters of the received signal with combined linear frequency modulation and multiple phase shift keying.

The drawing shows a block diagram of the proposed device.

The indicator device comprises a sweep generator 1, a first CRT2, an antenna 3, a broadband amplifier 4, a frequency detector 5, a first differentiating circuit 6, a second differentiating circuit 7, a mixer 8, an intermediate frequency amplifier 9, a first key 10, a first eight frequency multiplier 11 , the first band-pass filter 12, the first frequency divider 13 by eight, the second band-pass filter 14, multiplier 15, the third band-pass filter 16, the second frequency multiplier 17 by eight, the fourth band-pass filter 18, the second frequency divider 19 by eight, and the fifth A new filter 20, a phase detector 21, a low-pass filter 22, a control signal driver 23, a controlled delay element 24, a detector 25, a delay element 26, a second key 27, a search unit 28, a local oscillator 29, a second frequency detector 30, a phase shifter 31 90 °, a reference voltage generator 32, a second 33 and a third CRT 34, a narrow-band filter 35, an amplitude detector 36, a counting pulse generator 37, the first. unipolar valve 38, the first 39 and the second 40 matching elements, the first 41 and second 42 counters, the first pulse shaper 43, the recording unit 44, the amplifier-limiter 45, the third differentiating circuit 46, the second unipolar valve 47, the phase inverter 48, third 49 and fourth 50 matching elements, a reversible counter 51 and a third counter 52,. . The device operates as follows. The specified frequency range Dg is viewed using the search unit 28, which periodically changes the local oscillator frequency 29 according to a sawtooth law. At the same time, the search unit 28 forms a horizontal scan of a CRT 33 with a linear scan, which is used as the frequency axis, and its length corresponds to span of a given frequency range. . .

The received signal with combined linear frequency modulation and multiple phase shift keying, received from the receiving antenna 3, passes through the broadband amplifier 4 to the mixer 8, which is also supplied with voltage of a linearly varying frequency from the local oscillator 29. The mixer 8 generates a voltage the combination of frequencies supplied to the amplifier 9 intermediate frequency.

5 The intermediate frequency amplifier 9 extracts the intermediate frequency voltage supplied to the detector 25 to the first spectral width meter 55 and to the third frequency multiplier 56 by eight,

0 acting on the second meter 57 of the width of the spectrum. Since the voltage of the first meter 55, the spectral width is greater than. increases the voltage of the second spectral width meter 57, then the comparison unit 58 generates a positive pulse arriving at the threshold unit 59, in which it is compared with the threshold voltage.

In case of detection

0 of the signal, the threshold unit 59 of the detector 25 generates a constant voltage, which is applied to the input of the search unit 28, puts it in the stop mode, at the input of the delay element 26, to the control

5, the inputs of the first and second keys 10 and 27, opening them, and onto the vertically-deflecting plates of the CRT 33. From that moment on, viewing a given frequency range Дг and searching for signals stopped for a while

0 visual analysis of the main parameters / detected signal, which is determined. is a delay element 26. In this case, a pulse is generated on the screen of the CRT 33, the position of which is on a horizontal scan

5 determines the initial carrier frequency of the detected signal.

When you stop viewing the specified frequency range, the intermediate frequency amplifier 9 releases a voltage which, through the first open switch 10, enters the first frequency multiplier 11 by eight. The voltage generated by the first frequency multiplier 11 by eight is extracted by the first band-pass filter 12 and

5 arrives at the first frequency divider 13 into eight. The voltage of the first frequency divider 13 by eight, which is a linear frequency modulated signal at an intermediate frequency, is extracted by the second band-pass filter 14 and is applied to a frequency detector 5 producing a video pulse whose shape corresponds to the law of linear frequency modulation.

The video pulse of the frequency detector 5 is fed to the first differential circuit 6, which generates a pulse supplied to the vertically-deflecting plates of the CRT 2 and to the second differentiating circuit 7, which forms short bipolar pulses. In this case, the positive pulses of the first differentiating circuit 7 start the sweep generator 1, and the negative pulses close it. The sawtooth voltage generated by the sweep generator 1 is applied to the horizontally deflecting plates of the CRT 2, on the screen of which a pulse appears, the duration of which is proportional to the duration of the received signal. In this case, the amplitude is proportional to the rate of change of the frequency inside the pulse, and the area of the waveform is the frequency deviation of the received signal.

The voltage emitted by the second band-pass filter 14 is also applied to the information input of the controlled delay element 24, which acts on the list 15, which receives the intermediate frequency voltage with an intermediate frequency amplifier 9. A multiplier 15 generates a beat voltage, which is a multiple phase shift keying signal at a beat frequency. The beat voltage of the multiplier 15 is extracted by the third bandpass filter 16 and supplied to the second frequency multiplier 17 by eight. The second frequency multiplier 17 by eight through the fourth filter 18 acts on the second frequency divider 19 by eight, generating a voltage that is harmonic oscillation at the beat frequency. The voltage of the second frequency divider 19 by eight is extracted by the fifth band-pass filter 20 and applied to the phase detector 21, to which the reference voltage of the reference voltage generator 32 is supplied. In this case, the phase detector 21 generates a control voltage, the amplitude and polarity of which depends on the degree and direction of the deviation of the beat frequency relative to the frequency of the reference voltage of the generator 32. The control voltage of the phase detector 21 is extracted by the low-pass filter 22 and using the former 23 the control signal acts on the control input of the controlled delay element 24.

To visually evaluate the magnitude of the phase jumps and the multiplicity of the phase shift keying of the received signal, a CRT 34 made with a circular scan is used. 5 In this case, a circular scan is generated by the reference voltage generator 32, the frequency of which is maintained equal to the beat frequency. The voltage at the beat frequency from the third band-pass filter 16

0 enters through the public key 27 to the frequency detector 30, forming a sequence of short multi-polarity pulses, the temporary position of which corresponds to the jump

5 changes in the phase of the signal. In this case, the voltage of the reference voltage generator 32 is applied directly to the vertically deflecting plates of the CRT 34, and to its horizontally deflecting plates through the phase shifter 31, which provides a 90 ° shift, creating a circular scan on its screen. The sequence of short heterogeneous pulses from the frequency detector 30 is fed to the modulating

5 electrode of its electronic brightness. At the same time, an image is formed on the screen of the CRT 34 in the form of several bright dots arranged in a circle. The number of points determines the multiplicity of the phase manipulation, and the angular distance between them is equal to the magnitude of the phase jumps of the received signal.

The voltage emitted by the second band-pass filter 14 is applied to a narrow-band filter 35, which emits a radio pulse, the duration of which is determined by the ratio:

40

t Af / r,

where Af is the passband of the narrow-band filter;

y is the rate of change of frequency within the pulse.

The generated radio pulse arrives at amplitude detector 36, which detects its envelope. Said envelope enters the first input of AND element 39, to the second input of which counting pulses are fed from the output of the counting pulse generator 37. At the output of the And 39 element, counting pulses are formed, the number of which is proportional to the speed of the frequency change inside the pulse. These pulses are counted by a counter 41 and recorded by the registration unit .44.

A rectangular pulse proportional to the duration of the signal, from the output of the differentiating circuit 6 is fed to

the first input of AND element 40, to the second input of which counting pulses are supplied from the output of the counting pulse generator 37. At the output of AND element 40, counted pulses are generated, the number of pulses of which are proportional to the duration Hz of the received signal. These pulses are counted by the Counter 42 and recorded by the registration unit 44. The counting pulses proportional to ig. Simultaneously arrive at the inputs of the pulse generator 43, where it is determined in the digital code of the frequency deviation (DRD of the TA, which is also registered by the registration unit 44.

The voltage emitted by the band-pass filter 16, through the public switch 27, is fed to the input of the amplifier-limiter 45, which converts the signal with multiple phase manipulation into a sequence of different-shaped pulses of a rectangular shape, the duration of which is determined by the time intervals between the transition times through the zero level of the specified signal. The obtained rectangular pulses from the output of the amplifier-limiter 45 are received. At the first inputs of the elements And 49 and 50 And at the first input of the element And 50 are rectangular pulses through the phase inverter 48. Counting pulses from the output of the generator 37 counting are fed to the second inputs of the elements / 49 and 50 pulses. The difference in the number of counting pulses, which is proportional to the value of the phase jumps, is determined by the reversible counter 51 and is recorded by the registration unit 44.

Thus, the proposed device provides automatic measurement and registration of the main parameters of the received signal with combined linear frequency modulation and multiple phase shift keying (LFM-MFMn). Thereby, the functional capabilities of the device are expanded.

SUMMARY OF THE INVENTION;;, An indicator device comprising an antenna in series, a broadband amplifier, a mixer, the second input of which is connected through a local oscillator to the output of a sawtooth voltage generator, an intermediate frequency amplifier, the first key, the second input of which is connected to the detector output , the first frequency multiplier by eight, the first band-pass filter, the first frequency divider by eight, the second band-pass filter, the first frequency detector, the first differentiating circuit, the second differentiating circuit ; a sweep generator and horizontally deflecting plates of a first cathode ray tube whose vertically deflecting plates

connected to the output of the first differentiating circuit, connected in series to the output of the intermediate frequency amplifier, a multiplier, the second input of which is through the controlled delay element

connected to the output of the second bandpass filter, a third bandpass filter, a second frequency multiplier by eight, a fourth bandpass filter, a second frequency divider by eight, a fifth bandpass filter, a phase detector, the second input of which is connected to the output of the reference voltage generator, a lowpass filter and driver of the control signal, the output of which is connected to the second input of the control-delay element, a detector is connected in series to the output of the intermediate-frequency amplifier, the second input of which is connected to the output the house of the delay element, a sawtooth voltage generator and horizontally deflecting plates of the second cathode ray tube, the vertically deflecting plates of which are connected to the detector output, as well as 90 ° and horizontally deflected in series with the output of the reference voltage generator the third plate of the cathode ray tube, the vertically deflecting plates of which are connected to the output of the reference voltage generator, and the modulating electrode through series-connected voltages second key and the second

-frequency detector connected to outputs

the third bandpass filter and detector, with the exception that in order to

functional expansion possible. by automatically measuring and recording the main parameters of the received signal with a combined linear frequency modulation and multiple

phase manipulation, a narrow-band filter, an amplitude detector, a calculating pulse generator / the first and second unipolar valves, the first, second,

third and fourth coincidence elements, first and second counters, first and second pulse shapers, registration unit, limiter amplifier, third differentiating circuit, phase inverter,

a reversible counter, the third counter is connected to the output of the first counter, and a narrow-band filter, an amplitude detector, a first coincidence element, a first counter, a first are connected to the output of the second band-pass filter

a pulse shaper and a recording unit, the second input of which is connected to the output of the first counter, a second coincidence element and a second counter, the output of which is connected to the second input of the first pulse shaper and to the third input of the recording unit, the second inputs of the first and second matching elements through the counter pulse generator are connected to the output of the second differentiating circuit, the second inputs of the first and second counters through the first unipolar valve with dineny yield a second differentiating circuit, to the output of the second switch connected in series with a limiting amplifier, the third coincidence element and down counter, to the output of limiting amplifier.

the phase inverter and the fourth coincidence element, the output of which is connected to the second input of the reversible counter, are connected in series, the third differentiating circuit and the second unipolar valve, the output of which is connected to the third input of the reversing counter, the second inputs of the third and fourth coincidence elements are connected to the second output of the counter pulse generator; a third counter is connected in series to the output of the second frequency detector, the second input of which th connected

5 with the output of the first unipolar valve and the second pulse shaper, the second input of which is connected to the output of the second counter, and the output is connected to the fifth input of the registration unit.