SU1030993A1 - Device for shaping phase-shift keying signal - Google Patents

Abstract

A DEVICE FOR FORMING A PHASOMANIPULATED SIGNAL, containing the first AND-NOT element, the first input of which is connected to the first output of the M-sequence generator, the second output of which is connected to the first input of the second AND-NOT element, in order to improve the formation accuracy, the third and fourth elements AND-NOT and two flip-flops, with the first output of the first trigger connected to the second input of the first NAND element, the output of which is connected to the first input of the third AND-NAND element, the second input of which Dinen with the output of the second element IS-NOT, the second input of which is connected to the second output of the first trigger, the first input of which is connected to the first input of the fourth element AND-NOT, the second input of which is connected to the output of the third element IS-NOT, and the first output of the generator M- sequentially O) With these connected to the second input of the first trigger a, the input of the second trigger connected to the output of the fourth element AND-NOT. Cut ША, j с о СО y with Bbi} t.

Description

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The invention relates to radio engineering and can be used in radar, radio navigation and radio communications to form signals makpulirovannyh in phase M-sequence.

A device for generating a phase-shift keyed signal containing two flip-flops, the outputs of which are connected to the corresponding inputs of a modulo two tlj, is known. However, the device has a lacking accuracy of forming a phase-shift keyed signal. The closest to the invention is a device for generating phase-shift keyed signals comprising an M-sequence generator, the outputs of which are connected to the corresponding inputs of the AND 2 elements.

However, in this device, the error in phase manipulation by 180 °, due to the long-term instability and variation of parameters, phase characteristics of the antiphase channels, reduces the accuracy of the phase-shifted signal formation.

The purpose of the invention is to improve the formation accuracy.

To do this, a device for shaping a phase-shift keyed signal containing the first AND-NOT element, the first input of which is connected to the first output of the M-sequence generator, the second output of which is connected to the first input of the second AND-NO element, introduces the third and fourth AND-NOT elements and two triggers, with the first output of the first trigger connected to the second input of the first NAND element, the output of which is connected to the first input of the third NAND element, the second input of which is connected to the output of the second NAND element, the second input of which th is connected to the second output of the first flip-flop, a first WMOs coupled to a first input of the fourth AND-NO element, the second WMOs which is connected to the input of the third AND-NO element, and the first output of M-sequence generator is connected to

the second input of the first trigger, the input of the second trigger is connected to the output of the fourth NAND element.

FIG. 1 shows the structural electrical circuit of the proposed device; in fig. 2 - time diagrams.

The proposed device for generating a phase-shift keyed signal contains a 1 M-sequence generator, AND-NOT elements 2-5 ,. triggers 6 and 7.

A device for generating a phase-shift keyed signal operates on. pulse exclusion principle. The M-sequence generator 1 forms a direct and inverse M-sequence (Fig., F). The direct M-sequence arrives at the second input of trigger b, to the first input of which a high-frequency signal arrives (Fig. 2 (3). At the second output of trigger 6, a straight line is formed (Fig. 21). To inverse (Fig. 2E) M- sequences delayed for the period B1 frequency signal. With the help of AND-NE elements 3-5, a control signal is generated from the original direct and inverse and delayed direct and inverse M-sequences (Fig. 26) to be excluded from the high-frequency sequence (Fig. 2 -5 corresponding single pulses. of the IE-NE 2, a high-frequency sequence is formed with pulses excluded by the M-sequence (Fig.), which is fed to the input of the trigger 7. The output voltage of the trigger 7 is a high-frequency phase-shift keyed signal (Fig. 2J) .

The effectiveness of using the proposed device, for example, in radar, is to increase the likelihood of unambiguously determining the distance to the target, increasing the likelihood of detecting weak targets against the background of strong and underlying surfaces, and increasing the dynamic range of the radar.

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Claims (1)

DEVICE FOR FORMING A PHASOMANIPULATED SIGNAL containing the first AND-NOT element, the first input of which is connected to the first output of the M-sequence generator, the second output of which is connected to the first input of the second AND-NOT element, characterized in that, in order to increase the accuracy of formation , the third and fourth AND-NOT elements and two triggers are introduced, and the first output of the first trigger is connected to the second input of the first AND-NOT element, the output of which is connected to the first input of the third AND-NOT element, the second input of which is connected nen with the output of the second AND-NOT element, the second input of which is connected to the second output of the first trigger, the first input of which is connected to the first input of the fourth AND-NOT element, the second input of which is connected to the output of the third AND-NOT element, and the first ^ generator M output - sequentially connected to the second input of the first trigger, the input of the second trigger is connected to the output of the fourth element AND NOT. r ^{, D} Tis