RU-1841402-C - Phase modulator of interference signal

Abstract

FIELD: radio countermeasures. SUBSTANCE: invention relates to the field of radio countermeasures and can be used in relay-type jamming stations to suppress target illumination radar stations (RSL) and homing heads (HSN) that are part of multi-purpose defense systems and operate on a discontinuous probing signal. The claimed phase modulator of the interference signal contains two phase shifters connected in series, the first of which is connected to a sawtooth oscillator and a noise generator. In addition, the modulator contains a directional power splitter, a detector, a trigger, and a relay connected in series. EFFECT: technical result is the creation of a sequence of speed-diverting and noise jamming in synchronism with the frequency of the target illumination pulses, which ensures effective suppression of the radar (HSN) of multi-purpose defense systems. 1 cl, 3 dwg

Inventors

• Belyavskij Anatolij Petrovich
• MATVEEV VYACHESLAV ALEKSANDROVICH
• Poroshkin Nikolaj Andreevich
• ROZHKOV ERNST VIKTOROVICH

Assignees

• Акционерное общество "Центральный научно-исследовательский радиотехнический институт имени академика А.И. Берга"

Dates

Publication Date

20260506

Application Date

19770727

Claims (1)

1. A phase modulator of an interference signal, comprising two series-connected phase shifters, to the first of which a sawtooth oscillation generator is connected, and a noise generator, characterized in that, for the purpose of suppressing radars of multi-purpose defense systems, by creating a sequence of speed-decreasing interference and noise interference synchronously with the repetition rate of target illumination pulses, a series-connected directional power coupler, a detector, a trigger and a relay are introduced into it, wherein the second output of the directional power coupler is connected to the input of the first phase shifter, and the output of the relay with the noise generator connected to it is connected to the input of the second phase shifter.

Description

The proposed invention relates to the field of radio countermeasures and can be used in relay-type jamming stations for suppressing target illumination radar stations (RLS) and homing heads (GHS) that are part of multi-purpose defense systems and operate on an intermittent probing signal. In radio countermeasures, phase modulators are used to create speed-deviating interference. Early developments utilized sawtooth generators, the signal from which was fed to a microwave phase shifter upon command for prolonged irradiation of an aircraft [1]. In subsequent developments, modulators consisting of a sawtooth generator and a noise generator became widespread. The voltage from these generators is fed to series-connected high-frequency phase shifters to generate speed-distorting and noise interference. The interference generated in this manner is not synchronized with the discrete periodic target illumination steps used in multi-purpose defense systems. The activation sequence of one or the other interference is determined by a priori selected cycles. This circumstance makes it possible to implement anti-interference measures that reduce their effectiveness [2]. The aim of the present invention is to create a sequence of speed-distorting and noise interference synchronous with the repetition rate of target illumination pulses, ensuring effective suppression of radars (homing heads) of multi-purpose defense systems. The stated goal is achieved by introducing into the proposed device a directional power coupler, a detector, a trigger and a relay, the output of which is connected to one phase shifter, wherein one output of the directional power coupler is connected to a detector connected to the input of the trigger, the load of which is a relay connected to a noise generator, the other output of the directional power coupler is connected to another phase shifter. List of figures Fig. 1. Block diagram of a phase modulator of a microwave signal. Fig. 2. Diagrams of principal stresses: a. - detected voltage of the target illumination signal, b. - the envelope of the modulating voltage of the noise generator on the control electrode of the high-frequency phase shifter. Fig. 3. Dependence of the probability of missile flight on the distance to the target. The proposed device includes a directional power coupler 1, connected via a detector 2 to a trigger 3 and a high-frequency phase shifter 4, which is connected to a plasma-like oscillation generator 5 and a second high-frequency phase shifter 6, connected via a relay 7 to a noise generator 8 and a trigger 3. The device works as follows. The signal from the main channel of the repeater jammer is fed through the directional power coupler arm to the detector, whose output generates pulses corresponding to the target illumination signal envelope (Fig. 2a). These pulses are fed to the input of a trigger, which generates pulses (Fig. 2b) that control the operation of a relay, through which the modulating voltage from the noise generator is fed to the second high-frequency phase shifter. At the same time, a modulating voltage is supplied to the first phase shifter from the sawtooth generator, which ensures the displacement of the radar speed strobe (homing head) from the signal reflected from the target. The frequency of video pulses at the trigger output, and consequently the frequency of noise pulses at the output of the proposed device, is two times less than the frequency of target illumination pulses, which makes it possible to obtain alternation of noise and diverting interference synchronously with the frequency of illumination pulses. The jamming combination generated by the proposed device ensures prolonged disruption of target velocity tracking due to the periodic (with a period of 2T, where T is the illumination pulse repetition period) impact of Doppler noise on the velocity selector circuit. The velocity-distorting jammer increases the effectiveness of this jamming combination by increasing the dynamic tracking error. The radar's angular tracking channel (homing head) is unable to track the noise jammer's angular coordinates due to the periodic absence of Doppler noise. Therefore, information about the protected target's position is virtually absent from the homing head's angular coordinator, resulting in significant missile misses. The effectiveness of the combination of interference created by the proposed device was assessed using semi-naturalistic modeling methods on a real single-pulse homing head, which is part of a multi-purpose defense complex [3]. The experimental results are shown in Fig. 3. Curves 1 and 2 depict the dependence of the missile's miss probability on the distance to the target for a jamming-to-reflected signal power ratio of 10 and 15 dB, respectively. The graphs show that the missile's miss probability at a distance of 10 m from the target for a jamming-to-signal ratio of 15 dB is less than 0.15, indicating a sufficiently high jamming effi