RU2562449C2 - Identification method of signals of synchronous repeater jamming - Google Patents

Abstract

FIELD: radio engineering, communication.

SUBSTANCE: invention relates to radiolocation and can be used in radar stations for protection against synchronous repeater jamming. As a result of identification of synchronous repeater jamming, it is possible to detect real targets. An identification method of signals of synchronous repeater jamming is based on the fact that at radiation of a false probe, a station of synchronous repeater jamming, which is located at maximum distance (not achievable for means of destruction) for radar station suppression, including in the area of lateral lobes of antenna directivity diagram, radiates an amplified copy of the same signal, while level of the reflected false probe from the real target is lower than detection threshold. For identification of signals of synchronous repeater jamming, a sounding signal of reduced level (false probe) is radiated, and after that, detected signals are considered to be false.

EFFECT: identification of signals of synchronous repeater jamming, as well as identification of false routes formed at accompanying of the detected signals of synchronous repeater jamming.

Description

The claimed technical solution relates to the field of radar and can be used in radar stations (radar) to protect against synchronous response interference.

Big problems in the operation of the radar create pulse response interference, and above all synchronous response interference. As a result of their actions, false detection of targets occurs, since the received signals of synchronous response interference do not differ from signals reflected from real targets. The interference is especially effective when the director of the synchronous response interference repeatedly re-emits an amplified copy of the probe signal (the level of interference does not depend on the level of the probe signal). With a sufficiently high power of synchronous response interference, it is detected not only in the main beam, but also along the side lobes of the antenna pattern (BOTTOM), as a result of which a large number of false signals (marks) are created, which are stationary in the simplest case or moving with interference set by the designer speed resulting in the formation of a false path located in the radial direction relative to the radar. Therefore, such interference leads to disguise of real targets [Protection against interference. Ed. M.V. Maksimova, M., "Soviet Radio", 1976, p. 61].

Particularly difficult is the task of identifying targets masked by false detected signals under the action of interference in the main beam of the bottom beam. The direction to the director of the synchronous response interference can be determined if the director of the synchronous response interference emits an increased number of interference signals. However, it becomes impossible to determine the direction to the jammer if the jammer implements the task of masking real targets among false ones with a small number of them. In both cases, it is not possible to determine real goals among false ones (in the second case, in addition, the possibility of detecting the presence of an interference director is excluded). All known methods of suppressing interference in the main beam of the BOTTOM of a single-position radar (AGC, limitation, compensation [Protection against interference. Edited by MV Maksimov, M., “Soviet Radio”, 1976, pp. 132-147]) in the case actions of synchronous response interference with a high power level are not applicable, since the interference in its structure does not differ from the signals of real targets. In this case, an important task is to eliminate the masking effect of synchronous response signals.

This problem can be solved by recognizing signals of synchronous response interference, which will allow to distinguish signals from real targets. Thus, the technical result (the problem being solved) is the recognition of synchronous response interference signals.

The specified technical result is achieved by the fact that, in order to recognize synchronous response interference signals, according to the invention, the power of the probe signal (false probe) is reduced to a level at which the reflected signal from the real target is below the detection threshold, and then the detected signals are considered synchronous response interference signals .

The inventive method is based on the fact that when a false probe is emitted, the director of the synchronous response interference, located at the maximum range (unattainable for weapons), to suppress the radar, including in the area of the bottom lobes of the bottom beam, it emits an amplified copy of this signal, while the level of the reflected false probe from the real target will be lower than the detection threshold. Therefore, after the emission of a false probe, only a synchronous response interference can exceed the detection threshold. This is a sign by which this interference can be recognized.

The false probe level is set based on the following. When a false probe is emitted, the level of the reflected signal from a real target with a certain probability (equal to the allowable probability of erroneous recognition of a false signal or trace) should not exceed the detection threshold. If this excess occurs when a false probe is emitted, then the real target (or track) will be taken as a false one and the target will miss. Based on this, the level of the false probe can be determined, for example, from a mathematical expression

where P _probe is the power of the normal sounding signal;

P _{L. probe} - power of the false probe;

u ₀ is the detection threshold;

u is the amplitude of the received signal when a normal probe signal is emitted.

Thus, the implementation of the proposed method allows you to recognize signals of synchronous response interference, which is achieved by the claimed result.

Claims (1)

A method for recognizing synchronous response interference signals, characterized in that they emit a probe signal of a reduced power level (false probe), in which the reflected signal from a real target is below the detection threshold, and then the detected signals are considered synchronous response interference signals.