A highly dynamic GNSS interference suppression method based on null-slot widening technology for dual-polarized antenna arrays

Abstract

The invention discloses a high-dynamic GNSS interference suppression method based on a null-slot widening technology for a dual-polarized antenna array, and belongs to the technical field of polarization-sensitive uniform linear array signal processing. When the present invention performs tapering processing on the autocorrelation matrix of the received signal, the tapering matrix adopted is the hadamard product of the spatial domain tapering matrix and the polarization domain tapering matrix, wherein the polarization domain tapering matrix is ​​based on the polarization domain zero Then, based on the tapered autocorrelation matrix, the output signal power is minimized under unconstrained conditions to obtain the weight vector, and then beamforming is performed to obtain the output signal after interference suppression. The present invention has the advantage of being able to effectively suppress interference under the condition of null notch mismatch; compared with the traditional scalar array to achieve high dynamic GNSS interference suppression through the null notch widening method, it has the ability to distinguish the interference of different polarization modes in the same airspace position, The advantage of more degrees of freedom.

Description

technical field [0001] The invention belongs to the technical field of polarization-sensitive uniform linear array signal processing, and in particular relates to a highly dynamic GNSS (Global Navigation Satellite System) interference suppression method based on a null-slot widening technology for a dual-polarized antenna array. Background technique [0002] In the scalar array, when the interference signal and the GNSS signal are in the same direction, the interference cannot be effectively suppressed, which will cause the GNSS to be unable to be decoded accurately. The introduction of the polarization-sensitive array can solve the shortcomings of the scalar array very well. Because the polarization-sensitive array element introduces electric dipoles or magnetic dipoles, the received signal contains polarization information. When the interference is in the airspace position When it cannot be distinguished from the GNSS signal, the polarization information can be used to dis...

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Problems solved by technology

[0015] Polarization-sensitive arrays introduce multiple electric dipoles or magnetic dipoles into each array element, which greatly changes the array structure from traditional scalar arrays, and the above spatial tapering matrices are all in scalar is derived based on the array structure, so the above spatial tapering matrix is ​​not suitable for polarization-sensitive arrays

At the same time, the signal received by the polarization-sensitive array contains polarization information. It is precisely because of the existence of polarization information that we can distinguish the interference with the same direction as the signal and different polarization. There may be disturbance in the polarization mode, how to effectively solve the problem of disturbance in the interference polarization mode while retaining the unique advantages of the polarization-sensitive array, which is not involved in the zero-notch widening method of the scalar array

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