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Polarization sensitive array anti-interference method applied to satellite navigation

A polarization-sensitive array, satellite navigation technology, applied in the anti-jamming field of satellite navigation receiving systems, can solve the problems of lack of resolution and inability to ensure useful signal gain, and achieve the effect of ensuring satellite signal gain

Active Publication Date: 2017-08-29
NANJING UNIV OF SCI & TECH
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Problems solved by technology

[0006] It can be seen from the above that the existing technology only uses the joint anti-jamming in the space domain and the polarization domain, which can suppress 2N-2 interferences at most, and has no resolution in the time domain
In addition, since the satellite signal is not restricted during the anti-jamming process, the gain of the useful signal cannot be guaranteed

Method used

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  • Polarization sensitive array anti-interference method applied to satellite navigation
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  • Polarization sensitive array anti-interference method applied to satellite navigation

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Embodiment 1

[0037] A polarization-sensitive array anti-jamming method applied to satellite navigation, the steps are:

[0038] Step 1. In this embodiment, the array processing block diagram is as follows figure 1 As shown, the array antenna adopts 4 orthogonal linear polarization units, and the array element spacing is half a wavelength;

[0039] Step 2. Each orthogonal linearly polarized array element has 2 channel outputs, and performs filtering, down conversion, and digital-to-analog conversion processing on the 8 channels of radio frequency signals received by the antenna array to obtain 8 channels of baseband signals

[0040] X(t)=As(t)+n(t)=[x 1H (t) x 1V (t)...x 4H (t) x 4V (t)] T ;

[0041] Step 3, carry out delay processing of 4 time-domain taps to 8 baseband signals, X becomes 32-dimensional receiving data vector X=[x 11 x 12 x 13 x 14 …x 81 x 82 x 83 x 84 ] T ;

[0042] Step 4, establishing the normal right-handed circular polarization constraint vector. Assume...

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Abstract

The present invention discloses a space-time-polarization combination anti-interference method based on a polarization sensitive array. The method receives electric field components of two orthogonal directions while employing a quadrature linear polarization unit to obtain electromagnetic wave polarization domain information, the spatial distribution of array elements is employed to obtain signal spatial domain information and obtain time domain information through adoption of time domain tapping of each channel so as to realize space-time-polarization multi-domain combination interference resistance. On the basis of the LCMV criterion, according to the distribution characteristics and polarization characteristics of satellite signals, normal right-handed circular polarization constraint is added. Compared to a traditional array, the breakthrough of N-1 degree of freedom of N array elements is realized, 2N-1 broadband interference can be inhibited, and the gain of satellite signals is ensured while effectively inhibiting the interference.

Description

technical field [0001] The invention relates to the field of array signal processing, in particular to an anti-jamming method for a satellite navigation receiving system. Background technique [0002] Because the satellite is far away from the receiver and the transmitting power of the satellite is low, the satellite signal received by the receiver is very weak, which is usually submerged in the thermal noise of the receiver. When affected by various types of radio frequency interference from the outside world, especially man-made interference, the positioning accuracy of the navigation receiver decreases, and even loses the ability of navigation and positioning, which eventually leads to the failure of the navigation receiver to work normally. In order to receive navigation information correctly and give full play to the functions of the satellite navigation system, the first problem to be solved is to improve the anti-jamming ability of the navigation receiver. [0003] T...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S19/21
CPCG01S19/21
Inventor 王昊杨灵雪杨钰茜张慧莎
Owner NANJING UNIV OF SCI & TECH
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