Novel space-time joint anti-interference method

A space-time, new type of technology, applied in the field of space-time array antenna anti-jamming, can solve the problems that are not suitable for capturing fast-changing signals, and the frequency resolution of the adaptive processor is low

Active Publication Date: 2015-07-29
TAIYUAN UNIV OF TECH
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Problems solved by technology

However, due to the limitation of the taps of the FIR filter, the frequency resolution of the adaptive processor is very low, and because the spectral and statistical characteristics of the narrowband interference are unknown, this method is not suitable for capturing rapidly changing signals.

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Embodiment Construction

[0016] Each array element first samples each channel of the received signal of the array, and then performs radio frequency down-conversion conversion and digitization to obtain a digital intermediate frequency signal X i , X i =(x i1 , x i2 ,...,x iP ), i=1, 2, 3, ... M;

[0017] Digitize the IF signal X i Input it into the LMS frequency domain filter, and filter out the narrowband interference in the direction of the navigation signal through the frequency domain LMS iterative algorithm in the filter to obtain the filtered signal Z i (k), the frequency-domain weight coefficient iteration formula of the frequency-domain LMS iterative algorithm is: U(k+1)=αU(k)+2μE(k)*F(k), wherein, U(k+1), U(k) is the filter coefficient vector at k+1 and k moments respectively; α is the weight factor; μ is the convergence factor; F(k) is the Fourier transform of the digitized intermediate frequency signal Xi; E(k)=F( k)-U(k)*F(k) is the error signal; * is vector point multiplication, th...

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Abstract

The invention relates to a space-time array antenna anti-interference method in satellite navigation equipment, in particular to a novel space-time joint anti-interference method. The space-time joint anti-interference method comprises the following steps of restraining narrow-band interference in a navigation signal direction through the improved frequency domain narrow-band interference filter-out technology and achieving iteration solution of space-time array weight in combination with minimum variable step size mean square error to reduce the algorithm complexity of the method. The space-time array antenna anti-interference method in the satellite navigation equipment can restrain interference in the navigation signal direction, is low in algorithm complexity, simple in achievement and particularly suitable for application of future mini-sized high-dynamic anti-interference terminals.

Description

technical field [0001] The invention relates to a space-time array antenna anti-jamming method on a satellite navigation device, in particular to a method based on first using a frequency-domain filtering method to filter out narrow-band interference in the direction of navigation signals, and then using a variable step size algorithm to obtain space-time two-dimensional weights. The vector satellite navigation signal anti-jamming method is specifically a new space-time joint anti-jamming method. Background technique [0002] With the increasingly complex electromagnetic space environment for satellite navigation applications, the precise positioning of navigation terminals has become increasingly difficult, and various navigation terminal interference suppression technologies have emerged. Traditional receiver anti-jamming techniques include spatial filtering technology, time-domain filtering technology and frequency-domain filtering technology. These anti-jamming technique...

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Application Information

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IPC IPC(8): G01S19/21
CPCG01S19/21
Inventor 李灯熬刘金强赵菊敏牛文慧李帅
Owner TAIYUAN UNIV OF TECH
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