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An adaptive correction method for channel mismatch of GNSS antenna array

A calibration method and antenna array technology, applied in radio wave measurement systems, satellite radio beacon positioning systems, shaping networks in transmitters/receivers, etc. Realize the effect of relative correction and improve data consistency

Inactive Publication Date: 2018-12-28
NAT UNIV OF DEFENSE TECH
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Problems solved by technology

[0005] The technical problem to be solved by the present invention is that the channel mismatch of the antenna array causes the anti-interference performance to decline, so as to solve the problem of channel mismatch correction

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  • An adaptive correction method for channel mismatch of GNSS antenna array
  • An adaptive correction method for channel mismatch of GNSS antenna array
  • An adaptive correction method for channel mismatch of GNSS antenna array

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Embodiment Construction

[0028] The present invention will be further described below with reference to the drawings and embodiments.

[0029] Such as figure 1 Shown is a flowchart of the method of the present invention. In the embodiment, the data signal and interference received by the antenna array are radio frequency signals; the specific process is as follows:

[0030] (S1) Preprocess the received data of each element channel of the GNSS antenna array, and then convert the preprocessed data to the frequency domain;

[0031] (S2) Estimate the autocorrelation matrix of the received data in the frequency domain;

[0032] (S3) Select a reference array element channel, and estimate the cross-correlation vectors of other array element channels and the reference array element channel in the frequency domain;

[0033] (S4) According to the LMS algorithm (least mean square algorithm, LMS algorithm for short), calculate the optimal solution h of the equalization filter (n) for:

[0034]

[0035] among them, Is the ...

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Abstract

The invention relates to the technical field of array signal processing, in particular to an adaptive correction method for channel mismatch of a GNSS antenna array. The method comprises the followingsteps: (S1) converting the received data of each array element channel of the GNSS antenna array into frequency domain; (S2) estimating an autocorrelation matrix of the received data in the frequencydomain; 3) selecting a reference array element channel and estimating that cross-correlation vector of other array element channel and the reference array element channel in the frequency domain; (4)calculating the optimal solution h (n) of the equalization filter according to the LMS algorithm; (5) filtering the frequency domain data of each array element channel by using an equalization filter; (S6) converting the frequency domain data filtered by each array element channel in the step (S5) to the time domain by inverse Fourier transform. The invention takes the data of the reference arrayelement channel as a reference signal, corrects the received data of other array element channels, and realizes the purpose of improving the consistency of the channel data, that is, realizes the relative correction of the channel.

Description

Technical field [0001] The present invention belongs to the field of array signal processing technology, especially antenna array anti-interference technology, and more specifically relates to an adaptive correction method for GNSS antenna array channel mismatch. Background technique [0002] According to the different spatial characteristics of signal and interference, the antenna array can form a null in the interference direction to suppress interference. Under the ideal conditions of antenna and RF channel, both STAP and SOP can effectively suppress interference. However, each channel is composed of analog components such as antenna, low noise amplifier, frequency mixing, intermediate frequency amplifier, and analog-to-digital converter. The characteristics of these analog devices directly determine the frequency domain response of the antenna array channel, and the analog devices have characteristics that cannot be precisely controlled. The difference between the frequency...

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Application Information

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IPC IPC(8): H04L25/03G01S19/23H04B17/21
CPCG01S19/235H04B17/21H04L25/03159H04L25/0391
Inventor 鲁祖坤李蓬蓬左勇陈飞强耿正霖林红磊孙鹏跃陈雷徐博
Owner NAT UNIV OF DEFENSE TECH
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