Space-time two-dimensional narrow band barrage jamming method

A narrow-band interference and space-time technology, applied in the field of signal processing, can solve problems such as low sidelobes, deterioration of algorithm anti-interference performance, and signal cancellation

Inactive Publication Date: 2009-09-16
PLA AIR FORCE RADAR COLLEGE
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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; th

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[0045] The principle of implementing the present invention is as follows: Firstly, the number and parameters of interference sources are estimated by using the data received by the array, and then the information is used to form a blocking matrix, and finally the narrowband interference of the received data is canceled through the blocking matrix.

[0046] Assume that the phased array radar has M array elements and N interferences. In the embodiment, M=16, K=16, N=2, and the angles of interference are θ J1 , θ J2 . The detailed steps of this invention are described below in conjunction with accompanying drawing and embodiment:

[0047] (1) The array digital receiver 1 stores the received K pulse data of M array element channels into the system, and this part has the same requirements on the memory size and sampling accuracy as the original system.

[0048] (2) Adaptive equalization 2 performs adaptive equalization on the data received by the array. After equalization, the da...

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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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Application Information

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IPC IPC(8): G01S7/36
Inventor 陈辉陈建文谢谠吴志文
Owner PLA AIR FORCE RADAR COLLEGE
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