Channel equalization method based on response estimation frequency domain fitting

A channel equalization and channel technology, applied in the field of channel equalization based on frequency domain fitting of response estimation

Active Publication Date: 2020-12-29
XIDIAN UNIV
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Problems solved by technology

[0008] The purpose of the present invention is to overcome the deficiencies of the above-mentioned existing methods, and propose a method that considers the inconsistency of all signal receiving channels, weakens the influence of n

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  • Channel equalization method based on response estimation frequency domain fitting
  • Channel equalization method based on response estimation frequency domain fitting
  • Channel equalization method based on response estimation frequency domain fitting

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[0086] In order to further explain the technical means and effects of the present invention to achieve the intended purpose of the invention, a channel equalization method based on frequency domain fitting of response estimation proposed according to the present invention will be described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0087] The aforementioned and other technical contents, features and effects of the present invention can be clearly presented in the following detailed description of specific implementations with accompanying drawings. Through the description of the specific implementation mode, the technical means and functions adopted by the present invention to achieve the intended purpose can be understood more deeply and specifically, but the attached drawings are only for reference and description, and are not used to explain the technical aspects of the present invention. program is limited.

[0088]...

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Abstract

The invention discloses a channel equalization method based on response estimation frequency domain fitting. The method comprises the following steps of: receiving echo data of a multi-channel linearfrequency modulation continuous triangular wave; obtaining I sample data of each frequency point l of the echo signal; calculating a covariance matrix of each frequency point l of the echo signal in asmoothing mode; calculating a rough estimation value of an amplitude ratio and a phase difference of the channel relative to the reference channel response on each frequency point l through covariance matrix eigenvalue decomposition; fitting by using a harmonic model of the least square criterion to obtain accurate estimation values of the amplitude ratio and the phase difference; calculating a channel frequency response and a fitted channel amplitude-frequency response according to the accurate estimation values of the amplitude ratio and the phase difference; calculating a fitted inter-channel phase-frequency response by using the frequency response of each channel; and obtaining an equalizer response by using the fitted channel amplitude-frequency response and the fitted inter-channelphase-frequency response. According to the channel equalization method, the signal-to-noise ratio of the channel response is improved, and the angle estimation error caused by eigenvalue diffusion canbe effectively reduced.

Description

technical field [0001] The invention belongs to the technical field of array signal processing, in particular to a channel equalization method based on frequency domain fitting of response estimation. Background technique [0002] With the rapid development of phased array radar technology and direct digital synthesis technology, the wideband digital array radar combining the advantages of wideband radar and digital array radar is an important topic for active phased array radar. However, due to the large instantaneous bandwidth of the wideband digital array radar, the antenna and components are required to have a large bandwidth. Influence, resulting in distortion of channel transmission characteristics and inconsistency of frequency characteristics between channels, that is, channel mismatch. Analysis shows that channel mismatch severely deteriorates the processing performance of adaptive beamforming, sidelobe cancellation, and angle of arrival estimation, etc. In order ...

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Application Information

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IPC IPC(8): G01S7/41
CPCG01S7/41Y02D30/70
Inventor 汪争志杨志伟范志豪
Owner XIDIAN UNIV
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