SU987824A1 - Device for separating the sum of regular pulse trains - Google Patents

Description

The invention relates to radio engineering and can be used in systems for the analysis and measurement of pulse sequences.

A device for separating the sum of regular pulse sequences containing a radio receiver, the first output of which is connected to the input of the limiter, and the frequency ^ d frequency filters £ 1].

However, the known device has a low accuracy of sequence separation with an unknown pulse repetition period.

The purpose of the invention is to increase the accuracy of separation of the sequence with an unknown pulse repetition period. ,,

This goal is achieved by: jc that in the device for separating the sum of regular pulse sequences containing a radio receiver, the first output of which is connected to the input of the limiter, and η hour _ total filters, phaeo-correcting ²⁵ blocks, η shapers are introduced; reference pulses, η subtraction blocks, η elements and and a pulse parameter meter, while the limiter output is connected to the input of the frequency filter - ^{30 of the} first of η series-connected chains, each of which consists of a series-connected frequency filter, phase-correcting block, shaper reference pulses and a subtraction unit, the second input of which is connected to the input of the frequency filter, and the outputs of the corresponding drivers of the reference pulses are connected to the first inputs of the corresponding element And at the second input and output being connected respectively to the second output and the radio input meter pulse parameters.

In FIG. 1 shows a structural electrical diagram of the proposed device, in FIG. .2 - stress diagrams explaining his work.

A device for separating the sum of regular pulse sequences contains a radio receiver 1, a limiter 2, η chains (3-1) - (3-p) each of which consists of a frequency filter 4, a phase-correcting unit 5, a driver 5 of the reference pulses, a subtraction unit 7, η elements And (8-1) - (8-p)., meter 9 parameters of the pulses.

The device operates as follows.

The total sequence of radio pulses (Fig. 2a shows the sum of three sequences) is detected in the radio receiver 1 (Fig. 2b) and is limited in amplitude by the limiter 2 (Fig. 2c). The latter is performed with the goal of normalizing the level of spectral components of the total pulse sequence. Video pulses from the output of the limiter 2 are fed to sequentially connected chains (3-1) - (3-p), designed to highlight a particular regular sequence. The passbands of the frequency filters 4 of each of the chains cover the entire range of possible values of the frequencies of the pulse sequences. The passband of the frequency filters is determined by the resolution of the pulse repetition rate. The average frequency bandwidth of the frequency filters ίθ _π grows with number (n) and is determined by equality (except for the frequency filter of the first chain)

GDS

SI frequency of the frequency of the first chain, determined by the trace frequency

- the average filter which is a small number of shared sequences;

- bandwidth of the i-th frequency filter.

the equality of the passband of the frequency filters, i.e.: f _n · = fp,

If the spectral component of the selected sequence with the pulse repetition period T · falls into the passband, for example, of the frequency filter 4 of the first chain, then the harmonic component of the voltage shown in Fig. 2d will be highlighted at its output, if the period of the selected sequence exactly matches the average the frequency filter 4 of the first chain, then the moment of transition of the selected harmonic oscillations through the zero level from the bottom up will coincide with the leading edge of the pulse in the highlighted sequence (e.g., pulse sequence). With a difference in the indicated frequencies, the extracted component will have a certain phase shift relative to the emitted pulses. To exclude phase shift, a phase correction block 5, Shaper is provided. 6 reference pulses generates a reference sequence of pulses coinciding in time with the moment of transition of the harmonic oscillation at the output of the frequency filter through zero from the side of negative voltage values to the positive side of FIG. 2d).

. The reference sequence is fed to the elements And (8-1) - (8-p), through which the analyzed radio pulses from the second output of the radio receiver 1 at the moments of their coincidence with the reference pulses are fed to the meter 9 (ftsg.2e). In addition, the reference sequence is supplied to block 7, in which the pulses of the selected sequence are excluded from the total pulse stream coming from the output of the limiter 9. those. rarefaction occurs, the total flow (Fig. 2g). Separation of the remaining sequences occurs in a similar way: in subsequent chains. Sequential separation of signals, starting with the sequence with the largest period and ending with the shortest period, leads to the fact that although the amplitude-frequency characteristics of the frequency filters are They also overlap, but always the previous chain excludes pulses of the selected sequence from the total flow and thereby eliminates the false response of subsequent frequency filters.

Thus, the proposed device for separating the sum of regular pulse sequences allows you to expand the functionality and improve the accuracy of the separation of pulse sequences with an unknown repetition period.

Claims (1)

1. USSR author's certificate No. 308525, cl. H 04 B 1/66, 20,10.71 (prototype). j. j / / 1 pp PPP P P P P np P rl n n n n n n 3 g g n n j g Fsh, g