Capon robust self-adaptive beam forming method and system for mutual coupling errors

Abstract

The invention relates to the signal processing field for array antennas, in particular to a Capon robust self-adaptive beam forming method and a Capon robust self-adaptive beam forming system for mutual coupling errors. The beam forming system comprises a direction vector estimator, a sampler, a mutual coupling matrix former, a weight vector former and a beam former. The beam forming method of the beam forming system comprises the steps of data sampling, mutual coupling matrix acquisition, weight vector calculation, and steering vector and beam formation. The beam forming system and the beam forming method compensate for received array data by means of a mutual coupling matrix, correct the mutual coupling errors in the received array data, and improve the robustness of a self-adaptive beam forming algorithm; and the mutual coupling matrix corrects the mutual coupling errors of the array data, forms null in the direction of interference signals precisely, and improves an antenna gain ratio of a desired signal direction and the interference signal direction.

Description

technical field [0001] The invention relates to the field of signal processing of array antennas, in particular to a Capon robust adaptive beamforming method and system for mutual coupling errors. Background technique [0002] Based on the various advantages of array antennas and the requirements of existing technologies, array antennas play an important role in applications such as radar, seismic survey, sonar, mobile communication, radio astronomy, and electronic medical engineering. When applying the array antenna, the processing of the array signal is particularly important, because the array antenna has many signals and contains more interference, and only by effectively extracting and processing the array signal can we identify the signal we need. [0003] Capon adaptive beamforming technology means that the ratio of the power of the output signal of the array to the power of the interference signal plus the noise signal is maximized, the main lobe of the beam must be ...

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Problems solved by technology

[0004] However, the existing Capon adaptive beamforming is easily affected by the mutual coupling error in the array signal, which makes the stability of the Capon waveform formation poor, and cannot accurately form the zero limit in the direction of the interference signal, and the desired signal direction and the antenna direction of the interference signal The gain ratio is low, and it cannot enhance the desired signal and suppress the interference signal.

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