Space-time two-dimensional narrow band barrage jamming method

Abstract

The invention discloses a space-time two-dimensional narrow band barrage jamming method aiming at phased array radar. The conventional phased array radar controls the narrow band jamming by self adaptation, firstly learns the jamming data received by a radar receiver, and then forms zero point in a jamming direction. Such a conventional self-adaptive treatment method easily generates signal counteraction and is not suitable for motion jamming and fast-varied interstitial jamming, and the zero point depth and width are seriously influenced by the array error. The method for using ultra-low side lobe antenna can effectively resist jamming. But under the prior art and technological level, excessive side lobe requirements on phased array radar are unpractical. The invention comprises the steps of firstly estimating jamming parameters by a spatial spectrum estimation technique so as to obtain the jamming azimuth and frequency parameters, using relative parameter information to construct a space-time two-dimensional barrage matrix, multiplying the space-time two-dimensional barrage matrix by the received data so as to block the narrow band jamming with a specific frequency in the specific azimuth, and finally realizing space-time two-dimensional narrow band barrage jamming. The advantages of the invention are that the invention can be used for the phased array radar for resisting specific side lobe jamming and main lobe jamming, has small operand, and is easily realized and popularized.

Description

technical field [0001] The invention relates to a phased array radar self-adaptive suppression narrowband interference method in the field of signal processing, which is suitable for phased array radar signal processing systems, such as passive array radar signal processing systems based on external radiation sources, sky wave over-the-horizon Radar signal processing system and airborne phased array radar signal processing system, etc. Background technique [0002] At present, in the process of confrontation with the enemy's radar, it is mostly suppressive interference, usually in the form of narrow-band noise interference. However, some radars that work in the low frequency band, such as passive array radar based on external radiation sources, sky wave over-the-horizon radar, etc., face the most during the normal radar work and training process. narrowband interference. This kind of interference is relatively easy to suppress, and is usually suppressed by conventional fre...

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Problems solved by technology

[0004] However, the conventional adaptive processing method has the following three disadvantages when dealing with narrowband interference: First, it can only deal with sidelobe interference. The zero point is formed, resulting in signal cancellation; the second is that when the narrowband interference source moves rapidly or the gap changes, since the adaptive algorithm cannot learn the real interference at this time, the anti-interference performance of the algorithm will be seriously deteriorated; the third is the adaptive Interference cancellation needs to learn interference data. The usual method is to learn during the radar rest period, but some large-scale phased array radars do not have a rest period, so it is easy to learn the target at this time, resulting in target cancellation

Under the current technology and technology level, it is impractical to put too high sidelobe requirements on the antenna, especially for large phased array antennas, which cannot achieve ultra-low sidelobe at present.

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