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A highly dynamic GNSS null-broadening interference suppression method based on space-time processing

A technology of zero trap widening and interference suppression, which is applied in the direction of instruments, measuring devices, satellite radio beacon positioning systems, etc., can solve problems such as the complexity of the covariance matrix structure, increase the degree of freedom of anti-interference, increase computational complexity, suppress interference effect

Active Publication Date: 2021-09-24
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] To extend the zero notch widening technique based on the covariance matrix taper to the space-time processing structure of the uniform circular array, the problem to be faced is: compared with the linear array, the circular array adds one-dimensional interference azimuth information, how to solve the problem when the interference comes from The matrix cone is deduced under the condition of lack of information; in the process of space-time processing, the covariance matrix structure of the received signal is more complex, how to derive the matrix cone in such a complex structure, and how to achieve the covariance matrix taper without Increase and the contribution of noise to the covariance matrix, these are also the problems that the present invention needs to solve

Method used

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  • A highly dynamic GNSS null-broadening interference suppression method based on space-time processing
  • A highly dynamic GNSS null-broadening interference suppression method based on space-time processing
  • A highly dynamic GNSS null-broadening interference suppression method based on space-time processing

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0070] Embodiment 1: Consider that the pitch angle and azimuth angle of the GNSS signal arriving at the array element reference point are (-25°, 25°); the interference is a 3MHz linear frequency modulation (Linear Frequency Modulation, LFM) signal, and the direction is (65° ,25°), the center frequency is 14.98MHz, and the interference-to-noise ratio INR=60dB; the standard deviation parameter σ in the tapering matrix; the fixed frequency is the center frequency, and the following is obtained: figure 2 The beamforming diagram is shown, and the profile is shown in image 3 shown;

[0071] The simulation found that the ST-CMT invented in this paper can be combined with the MVDR beamforming technology, which can point the main beam to the direction of the desired signal, and form a wider null in the pitch angle and azimuth angle of the interference, so as to suppress the interference in high dynamics Purpose.

Embodiment 2

[0072] Embodiment 2: the elevation angle and the azimuth angle of the desired signal are (-15°, 25°); the interference signal is far-field LFM, its center frequency is 14.98MHz, the bandwidth is 2MHz, and the interference signal direction is (55°, 105°) , the interference-to-noise ratio INR=60dB, 20 Monte Carlo experiments; when there is a mismatch in the pitch angle, the simulation results under different taper matrix parameters σ are as follows Figure 4 Shown in (a); similarly, we obtain the change situation of the ST-CMT-MVDR anti-jamming performance when there is a mismatch in the azimuth angle; σ=0° corresponds to the traditional MVDR algorithm without zero trap broadening;

[0073] like Figure 4 As shown, in a highly dynamic environment, that is, when there is a mismatch in the interference null direction, the anti-jamming performance of the traditional space-time minimum variance distortion-free response algorithm ST-MVDR deteriorates rapidly with the increase of the ...

Embodiment 3

[0074] Embodiment 3: the elevation angle and azimuth angle of desired signal are (-25 °, 25 °); Interference signal is far-field LFM, and its center frequency is 14.98MHz, bandwidth 2MHz, and interference comes from (60 °, 100 °), The interference-to-noise ratio is 60dB; the number of Monte Carlo tests is 3000; on the one hand, the parameter σ of ST-CMT-MVDR is set to 0.2° and 1.2° respectively, and it is applied to a Gaussian mismatch high dynamic environment with different standard deviations , to observe the variation of its anti-jamming performance with the standard deviation of the mismatch magnitude; on the other hand, we explored how the anti-jamming performance varies with the mismatch degree when the parameter σ of ST-CMT-MVDR just matches the standard deviation of the disturbance magnitude. Changes.

[0075] like Figure 5 As shown, setting the parameters of ST-CMT-MVDR properly can effectively ensure the robustness of the anti-jamming algorithm. In addition, it ca...

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Abstract

The invention relates to interference suppression technology in the field of uniform circular array signal space-time processing, and provides a high-dynamic GNSS null-broadening interference suppression method based on space-time processing to overcome the zero-trap mismatch problem existing in GNSS under high dynamic conditions . On the basis that the mismatch / perturbation angle is set to obey the Gaussian distribution in the present invention, the matrix cone generated by it does not need to rely on the prior information of the interference direction, and is combined with the beamforming algorithm and the power inversion algorithm to realize zero trap widening, thereby solving the problem of The problem of zero trap mismatch under high dynamics.

Description

technical field [0001] The invention relates to an interference suppression technology in the field of space-time processing of uniform circular array signals, and specifically provides a space-time processing-based high-dynamic GNSS null-broadening interference suppression method. Background technique [0002] Adaptive array antennas can suppress strong interference signals in GNSS very well, and uniform circular arrays are often used as smart antennas due to their good full-plane scanning capabilities; and space-time signal processing effectively combines space-domain filtering and time-domain filtering. Advantages, increase the degree of freedom of anti-interference, and can well suppress narrow-band interference and broadband interference; It can achieve interference suppression very well, so it is widely used. However, in a highly dynamic environment, the target receiver changes rapidly relative to the interference, and the null formed by the traditional anti-jamming a...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01S19/21
CPCG01S19/21
Inventor 李会勇魏圣杰夏威谢明
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA
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