SU873149A1 - Device for measuring coherent periodic signal amplitude phase characteristics - Google Patents

Description

(54) DEVICE FOR MEASUREMENT OF AMPLITUDE-PHASE CHARACTERISTICS OF COHERENT PERIODIC SIGNALS

The invention relates to radio engineering and can be used in radio measurement technology and for the sake of location, when it is required to investigate both the shape of the envelope and the phase structure of a periodic sequence of radio pulses. A device of radio pulse gating is known, which contains a ball mixer and a gate shaper. pulses 1. A disadvantage of the known devices is the limited functionality. The closest in technical essence to the proposed (1st is a radio pulse gating device of a coherent radio pulse sequence containing a balanced mixer, narrowband filter, amplitude detector, auto-shift unit and gate pulse shaper 2. The device allows linear transformation of the time scale of radio pulses in disproportionate radio pulse. of the carrier frequency. The radio pulse gating device requires for the extraction of intrapulse phase The structure of the signal under study is using additional phase-sensitive devices, since the signal at the output of the narrow-band filter can be represented as (t) –KA (- | r),), where A (t); H (t); Chooping, phase structure and initial, to the phase of the signal under investigation, respectively; (- time scale stretch ratio; K - converter transfer ratio. The aim of the invention is to expand the functionality. The goal is achieved in that the device comprising a series-connected balanced mixer, a narrow-band filter, an amplitude detector, and a series-connected pulse generator, block autoshift, video gate driver and gate gating pulse generator, connected to the input of a balanced mixer, sequentially inserted deli are entered spruce repetition frequency and two single sideband modulator with suppressed carrier, wherein the repetition frequency divider input for two input coupled to the pulse shaper, and the output of a single-sideband modulator with suppressed carrier - with an input of the strobe radio pulses.

The drawing shows a functional diagram of the device.

The device circuit contains series-connected balanced mixer 1, narrow-band filter 2, amplitude detector 3, as well as series-connected single-sided modulator 4 with carrier suppression and shaper 5 coherent strobe radio pulses, the output of which is connected to the second input of the balanced mixer 1. In the reference frequency shaping channel The devices are connected in series to a pulse former with a frequency I., an auto-shift circuit 7, providing the necessary delay between these pulses t period to period, and the driver of 8 video gates, the output of the shaper of 8 video gates is connected to the second input of the shaper of coherent strobe radio pulses, and the input of the shaper of pulse 6 with frequency I is connected to the splitter .9 frequency two, the output of which is connected to the second input of the single sideband modulator 4. with suppression-carrier.

The scheme works as follows.

The test signal with the carrier frequency is) fj and the repetition frequency 51 is fed to one of the inputs of the balanced mixer 1, to the other input of which a reference signal arrives in the form of strobe radio pulses with an amplitude sufficient to perform the linear conversion mode. The carrier frequency of the gating radio pulses (formed using a single-sided modulator 4 with suppression of the carrier and the frequency divider circuit 9 by two. The pulse former generator b with the frequency I. converts the continuous oscillation of the frequency 51 into pulses followed by a period T, Avtoshift 7 provides for a delay of these impulses by the value of 1, where K is the periotation number, D-L-reading step, defined by the Kotelnikov theorem. The circuit of the autoshaft 7 in combination with the shaper, coherent gating radio pulses 5 and the balanced mixture with the village 1 provides a temporary transformation of the envelope and phase structure of the signal. From the output of the balanced mixer, the signal enters the narrowband filter 2, which is tuned to one of the frequencies

Si-yr (vi4) 5l.

The signal at the filter output is

(t) - KA (i | q,) co% 4 {t | cv) -% co5ftht With a sufficiently large transformation ratio of the time scale (() and dV / dt, dA / dt 5a output signal

2 (O-lCAWcv) C05C (t ((V) -4o

can be selected by the amplitude detector 3 .;

Thus, the shift of the carrier clock of a gating radio pulse by half the signal repetition frequency in the proposed device while retaining the advantages of the known transducers of the time scale of the radio pulses, transforms the phase structure of the signal into a modulation of the envelope of the transformed oscillation according to the law of CO5 {} P (- 3 applications of additional phase-sensitive elements. This makes it possible, by making the main effort at a low frequency Slvi, to measure the intrapulse phase signal structure 1 (t).

Claims (2)

1.Naidenov A.I. Theoretical foundations and methods for linear transformation of the time signal of electrical signals. Issues of radio electronics. Ser. RT 1968, issue 6, p.179. 2.Naidenov A.I. Spectral transformation of nanosecond pulses. M., Sovetskoye Radio, 1973, p. 13,27. . d% GT