SU1557533A1 - Oscillographic phase meter - Google Patents

Abstract

The invention relates to a radio measuring technique and can be used to determine the parameters of the phase-shifted signals. The purpose of the invention — extending the functionality — is achieved by ensuring that two photo-recorders 7, 8 are illuminated, corresponding to the phase jumps of the input signal, vertical scans of CRT 9 and 10. Highlights are formed by forming circuits 1 and 2, and photo-recorders are controlled by an amplitude detector 3 and differentiating circuit 6 4 il.

Description

Fig1

The invention relates to a radio measuring technique and can be used in radiolocation and communication, where phaeomanipulated signals are widely used.

The main parameters of the phase of the manipulated signal are the magnitude of phase jumps & c, the duration Јn and the number N of elementary premises, the multiplicity of phase manipulation w (base of the modulating code) and the law of phase manipulation

Invention Chain — Enhanced Functionality

Fig, 1 shows a structural diagram of an oscillographic phase meter; Fig 2 is a block diagram of a fatoregister; 0 3 - developed photographic films; FIG. 4 shows time diagrams explaining the principle of operation of the phase meter.

The oscillographic phase meter contains input drivers 1 and 2, amplitude detector 3, generators A and 5 of sawtooth voltage, differentiating unit 6, photo recorders 7 and 8, cathode ray tubes (CRT) 9 and Yuo

Each photographic recorder consists of a lens 11, a tape mechanism (not shown) driving the feed 12 to the receiving 13 of the cassette with film 14, the screen 15 with the slits and the neon light 16.

The input shaper 1, sawtooth generator 4 and vertical plates of CRT 9, the modulating electrode of which is connected to the output of the second input shaper 1 and the input of the sawtooth generator 5, are sequentially connected to the phase meter input, the output of the latter is connected to the vertical plates of the CRT 10, modulating the electrode of which is connected to the output of the first input shaper; Before the CRT screens 9 and 10, photo recorders 7 and 8 are installed, respectively; Amplifiers are connected in series to the phase meter input The detective detector 3 and the differentiating unit 6, the output of which is connected to the control inputs of the photoreceivers 7 and 8 "

The phase meter works as follows,

The received phase-shift keyed signal (FIG. 4, a) is fed to the inputs of the amplitude detector 3 and the input

0

five

shapers 1 and 2, which generate short pulses at the time the signal crosses the zero value. Moreover, the input driver 1 generates short pulses when crossing the zero level with a positive productive, i.e. from the bottom up (Fig. 4, b), and the input driver 2 - short pulses when the phao-manipulated signal crosses the zero level of the negative derivative, i.e. from top to bottom (Fig. 4c). These pulses control the operation of the corresponding sawtooth voltage generators 4 (fig45 g) and 5 (fig.4, e). The sawtooth voltage from the outputs of the generators 4 and 5 is fed to the vertical plates of the corresponding CRT 9 and 10 to form a linear sweep. At the same time, short pulses arrive at the modulating electrodes of the CRT 9 and 10 and illuminate the vertical scanning lines at the corresponding points0 In this case, the position of the illuminated point on the vertical scanning line depends on the phase jumps utf of the received phase-shift keyed signal. If the phase jump is absent (), then the scan illumination is performed at points 0 (Fig. 3 and 4, g, d). When the Laza changes abruptly by a certain value Lz, the sweep illumination occurs at the corresponding point lying above the 0 "point. Figures 3 and 4, g, d show the following points as an example: 0 - for uCf 0; 3 - for b" | 180 ° 5 1.2 - for 0 uqxl80 ° 0 The points illuminated on the screen of the CRT 9 (10) are recorded by the photo recorder 7 (8) on the film 14, which is driven by a tape drive mechanism (not shown). Tape mechanisms of photographic recorders 7 and 8 are turned on and off synchronously. For this, the received phase-shift keyed signal Uc (t) (FIG. 4, a) is fed to the input of an amplitude detector 3, which selects the signal envelope (FIG. 4, e). This envelope is fed to the input of differentiating unit 6, which forms short pulses of positive and negative polarity (Fig.). Moreover, the positive short pulse is turned on, and the negative short pulse turns off the tape-recording mechanisms of the photo recorders 7 and 8. Lento

Stretching mechanisms can change the speed of the film flow. The direction of motion of the films is perpendicular to the scanning line. As a result, points 0, corresponding to the case of the absence of a phase jump (), are recorded on photographic films in the form of a reference (zero) line, and other points (1,2,3) - in the form of a corresponding broken line (oscillogram) (Fig. 3) . The speed of movement of photographic films is chosen such that all phase changes of the received phase-shift signal are recorded on them. To facilitate the reading of the magnitude of phase jumps uip, scale marks are periodically created on the photographic films by exposing them to the screen 15 from the neon light 16.

After the development of photographic films, one can visually assess the main parameters of the received phase-shift keyed signal; the magnitude of the phase jumps D c in the degree of oscillogram deviation from the reference (zero) line; the multiplicity of phase manipulation m (base of the modulating code) by the number of levels occupied by the oscillogram relative to the reference line; element duration

tare parcels in the smallest time interval tn between adjacent levels and the known speed of the film flow; the number of phase jumps}, and therefore, the number of elementary parcels N by the total number of level changes

Between the number of phase jumps} and the number of elementary parcels N for the duration of the signal .and

There is a dependency:

analytical

.

The set of measured parameters is estimated from the totality of the measured parameters.

Pulsations of received phase signal.

The speed of film stretching can narrow or stretch useful information contained in oscillograms recorded on films.

Thus, the proposed phase meter as compared with the base object allows one to visually estimate not only the magnitude of the jumps, the utp phase, but also the duration of the elementary parcels Ј, their number N, the multiplicity of phase manipulation that (base of the modulating code) and the law of phase manipulation of the received phase shift signal

Claims (1)

Invention Formula 25 shaped 0 five 0 five An oscillographic phase meter containing a series-connected input driver and a voltage generator 3 whose output is connected to vertical plates of a cathode ray tube, whose modulating electrode is connected to the output of a second input generator, the second saw-voltage generator, characterized in that functionality, two photoregistrars are introduced into it, a second electron beam tube to a series-connected amplitude detector and a differentiating Lok, the output of which is connected to the control inputs of the photographic, the amplitude detector input coupled to inputs of input shapers, shaper output of the second input through the second sawtooth generator is connected to the vertical plates of the second cathode-ray tube, a modulating electrode coupled to an output of the first input shaper " 9 (1 $ PI It uh /five eleven / 4 I f ffm ; & t fi & w № & сшт0 $ m & M9 / vrttV 0 ЯОрМ09 SffMtM but S 8 i i ii ui MI i In mill III S e well  ; m i; i P i in in1 9gL