RU-1841397-C - Device for generating narrow-band retransmission flickering interference

Abstract

FIELD: field of jamming. SUBSTANCE: invention relates to the field of jamming, in particular to devices for creating retransmission flickering narrow-band jamming of semi-active homing heads (HH) with continuous radiation. The claimed device consists of an antenna of a microwave amplifier, a phase shifter and a noise source. At the same time, the input of the phase shifter is connected to the output of the modulating signal adder, the inputs of which are connected to the narrow-band noise generator and the periodic signal generator, which is controlled by the frequency meter of the target illumination signal frequency jump. EFFECT: technical result is to increase the efficiency of narrow-band flickering jamming created by repeaters, to ensure the neutralization of the protection of a semi-active HH using the control of the frequency of the illumination signal. 1 cl, 5 dwg

Inventors

• Yudin Leonid Mikhajlovich

Assignees

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

Dates

Publication Date

20260506

Application Date

19721120

Claims (1)

1. A device for generating narrow-band repeater flickering interference by a semi-active seeker with continuous radiation, consisting of a microwave amplifier antenna, a phase shifter and a noise source, characterized in that, in order to overcome the seeker's protection from the effects of repeater flickering interference, carried out by controlling the frequency of the target illumination signal, the input of the phase shifter is connected to the output of a modulating signal adder, the inputs of which are connected to a narrow-band noise generator and a periodic signal generator, controlled in frequency by a meter measuring the magnitude of the frequency jump of the target illumination signal.

Description

The invention relates to the field of interference generation. To significantly reduce the likelihood of aircraft being hit by semi-active continuous-wave surface-to-air missile (SAM) systems, narrowband flickering jamming is used. Theoretical and experimental studies show that flickering jamming is an effective means of protecting aircraft from SAM attacks. To reduce the effectiveness of flickering jamming, SAM systems employ jamming protection methods based on the speed and range resolution of jammers. However, target range resolution requires the use of probing signals with appropriate range modulation, which complicates the design of the seeker, and is not used in known semi-active SAM systems of potential adversaries. Selecting jammers by speed is difficult, as the speeds of aircraft in the flight formations used vary little and can be relatively easily masked by narrowband noise. Angular seeker selection also prevents the ability to isolate a single jammer from a group within the entire engagement zone. Furthermore, the small permissible dimensions and weight of the seeker make it very difficult to implement effective protection against flickering jamming. Therefore, efforts are being made to protect the seeker by utilizing the capabilities of the target illumination radar based on the angular resolution of aircraft in the group. Angular gating prevents the transfer of the RPC antenna from one relay jammer to another. Furthermore, angular gating in the radar provides the seeker with conditions for illuminating a single aircraft by correspondingly changing the carrier frequency of the target illumination signal. When switching the power of the jamming sources, the carrier frequency of the radar changes abruptly by an amount exceeding the operating range of the seeker's Doppler frequencies. With narrowband repeater jamming, changing the carrier frequency of the illumination signal leads to a similar change in the carrier frequency of the jamming signal. Such jumps in the carrier frequency of the jamming signal create conditions for the seeker to operate against a narrowband intermittent noise interference emitted by a single aircraft, angularly gated by the target illumination radar. The effectiveness of intermittent interference on the seeker is significantly lower than that of flickering interference. Therefore, this protection significantly reduces the effectiveness of narrowband flickering interference generated by repeaters. The aim of the present invention is to eliminate the said disadvantage of narrow-band repeater flickering interference, namely, to neutralize the protection of a semi-active seeker using control of the illumination signal frequency. The stated objective is achieved by introducing into the transmitter of relay interference a modulating signal adder and a periodic voltage generator, the frequency of which is set from the circuit for determining the magnitude of the jump in the carrier frequency of the target illumination signal. The outlined essence of the invention is explained by the following drawings, which depict: Fig. 1 shows a block diagram of a narrowband noise interference repeater transmitter: 1 - receiving system; 2 - microwave phase shifter; 3 - microwave amplifier; 4 - narrowband noise generator; 5 - low-frequency switching voltage generator; 6 - transmitting antenna; 7 - synchronization; Fig. 2 is a block diagram of the proposed device, where 1, 2, 3, 4, 5, 6 and 7 are the same elements as in Fig. 1, and 8 is a microwave splitter; 9 is a modulating signal combiner; 10 is a periodic voltage generator; 11 is a circuit for determining the magnitude of the frequency jump of the backlight signal; Fig. 3 shows an illustration of the impact of flickering narrowband repeater noise interference, showing: a - switching the power level of the first and second interference sources; b - the position of the seeker speed strobe and the spectrum of the interference signal of the 1st and 2nd sources; c - changing the position of the sighting lines of the seeker system; Fig. 4 shows an illustration of the impact of flickering narrowband noise radio interference on the seeker in the presence of a frequency jump in the illumination signal: a - switching of the power level of the first and second sources; b - position of the seeker speed strobe and the narrowband noise spectrum on the frequency axis; c - position of the seeker antenna line of sight; Fig. 5 shows an illustration of the effect of flickering narrowband noise interference created by the proposed device on the seeker when the frequency of the illumination signal changes: a - switching the power level of the first and second sources; b - position of the seeker speed strobe (marked with circles) and the narrowband interference spectrum on the frequency axis; c - change in the position of the seeker antenna line of sight (marked with a circle). As mentioned above, a repeater jammer is currently used to create flicker interferen