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Robust adaptive beamforming method and device for suppressing main lobe interference

A technology of adaptive beam and main lobe interference, which is applied in the field of radar, can solve the problems affecting the performance of adaptive beam, the increase of side lobe level, and the cancellation of desired signal, so as to avoid the cancellation of desired signal and suppress the main lobe interference , the effect of improving the robustness

Active Publication Date: 2019-09-06
XIDIAN UNIV
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Problems solved by technology

[0004] Main lobe interference is a common radar interference, which enters from the main lobe area of ​​the radar and misleads the desired signal of the target in the received signal, thereby causing the main lobe of the beam to be deformed and the level of the side lobe to increase, which seriously affects the adaptive beam Formed performance
In addition, when the covariance matrix of the noise contains the desired signal, adaptive beamforming will cause the phenomenon of desired signal cancellation, that is, suppress the noise signal while suppressing the target desired signal

Method used

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  • Robust adaptive beamforming method and device for suppressing main lobe interference
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  • Robust adaptive beamforming method and device for suppressing main lobe interference

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Embodiment 1

[0064] See figure 1 , figure 1 It is a flowchart of a robust adaptive beamforming method for suppressing main lobe interference provided by an embodiment of the present invention. The adaptive beamforming method in this embodiment includes:

[0065] S1: Establish a receiving signal matrix according to the receiving signals of the array antenna;

[0066] In this embodiment, an array antenna composed of N antenna elements is used to receive echo signals. In practice, the echo signal may come from a target desired signal, main lobe interference, side lobe interference, and the like. Specifically, the S1 includes: using an array antenna composed of N antenna elements to receive echo signals; then establishing a received signal matrix X according to the echo signals:

[0067]

[0068] where x k (t) represents the echo signal received by the kth antenna element, n k Indicates the noise of the kth antenna element, N indicates the number of antenna elements, p indicates the n...

Embodiment 2

[0116] On the basis of the above embodiments, this embodiment provides a robust adaptive beamforming device that suppresses main lobe interference. See figure 2 , figure 2 It is a structural block diagram of a robust adaptive beamforming device for suppressing main lobe interference provided by an embodiment of the present invention. The adaptive beamforming device of this embodiment includes a blocking matrix construction module 101, a calculation module 102, and a suppression module 103 connected in sequence, wherein the blocking matrix construction module 101 is used to construct a multi-stage blocking matrix according to the desired signal direction and the main lobe interference direction The calculation module 102 is used to calculate the optimal weight vector of the received signal matrix according to the multi-stage blocking matrix; the suppression module 103 is used to suppress the main lobe interference by using the optimal weight vector of the received signal mat...

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Abstract

The invention discloses a robust adaptive beamforming method and device for suppressing main lobe interference. Therobust adaptive beamforming method comprises the following steps that firstly, a signal receiving matrix is established according to a received signal of an array antenna; secondly, a multi-level blocking matrix is constructed; thirdly, thesignal receiving matrix is preprocessed according to the multi-level blocking matrix, and thus preprocessed data are obtained; andfourthly, the optimal weight vector of the signal receiving matrix is calculated by using the preprocessed data toobtain an adaptive beam.According to the robust adaptive beamforming method and device for suppressing the main lobe interference, thesignal receiving matrix is processed through themulti-stage blocking matrix, the target expected signal in an echo-supressing signal is suppressed by a first-stage blocking matrix to avoid the target expected signal cancellation; the interference of the mismatch ofthe main lobe is suppressed through a second-stage blocking matrix, and thus the pointing direction of a main beam is improved, interference of the main lobe can be effectively suppressed, and thus the main beam steadily points to the target direction.

Description

technical field [0001] The invention belongs to the technical field of radar, and in particular relates to a robust adaptive beam forming method and device for suppressing main lobe interference. Background technique [0002] In a complex signal environment, there are not only target desired signals, but also a large number of interference signals. When the interference signal is stronger than the target desired signal, the output target desired signal will be covered by the interference signal. To reduce the influence of interfering signals, the best way is to make the zero position of the array antenna pattern always point to the direction of interfering signals, and at the same time ensure that the main lobe is aligned with the desired signal direction. Therefore, the array antenna pattern is required to adaptively meet the above requirements. The beamforming technology with this adaptive capability is called adaptive beamforming. [0003] The basic idea of ​​adaptive ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S7/36
CPCG01S7/36
Inventor 高永婵左磊张鹏房云飞
Owner XIDIAN UNIV
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