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Satellite navigation anti-interference method based on space-frequency adaptive filtering

A space-frequency self-adaptive, satellite navigation technology, applied in the field of satellite navigation anti-jamming, can solve the problem of satellite navigation being susceptible to interference, achieve the effect of improving the real-time performance of calculation, improving the real-time performance of calculation, and reducing the amount of calculation

Pending Publication Date: 2019-11-26
XIAN FLIGHT SELF CONTROL INST OF AVIC
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Problems solved by technology

[0004] Aiming at the problem that satellite navigation is susceptible to interference, a digital signal processing method of airspace adaptive filtering is proposed to realize the anti-jamming function of satellite navigation

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  • Satellite navigation anti-interference method based on space-frequency adaptive filtering

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Embodiment Construction

[0041] The present invention is described in detail below in conjunction with accompanying drawing

[0042] The present invention adopts the second-order space-frequency adaptive processing (Space Frequency Adaptive Processing, SFAP) method, divides the input signal into N frequency points through FFT (fast Fourier transform), and adopts matrix inversion on each frequency point The method to calculate the optimal weight of each array element. The data after FFT is cached, weighted with the optimal weight value calculated from the data, and then IFFT (inverse fast Fourier transform) is performed to achieve the purpose of suppressing interference.

[0043] Assuming that the array has M array elements, the operation of each frequency point is carried out in a 2M×2M dimensional matrix, including three digital signal processing steps of statistical average calculation of covariance matrix, matrix inversion and weight normalization. The present invention selects N=64, in order to r...

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Abstract

The invention, which belongs to the field of satellite navigation anti-interference, discloses a space-frequency adaptive processing method. The method comprises the following steps: receiving intermediate frequency data of M array elements; in the intermediate frequency data of each array element, forming a data segment by every N points, and windowing each data segment to obtain a windowed datasegment; performing 25% overlapping processing on the windowed data segment to obtain an overlapped data segment; performing N-point Fourier transform on each overlapped data segment to obtain corresponding frequency point data; utilizing the frequency point data to calculate a covariance matrix of each data segment in the frequency point data; performing adaptive diagonal loading on the covariance matrix to obtain a loading matrix; performing inversion on the loading matrix to obtain an inverse matrix; solving the optimal weight of the frequency point data by utilizing the inverse matrix; performing weighting processing on the frequency point data by using the optimal weight to obtain weighted data; and performing inverse Fourier transform on the weighted data and outputting a processingresult.

Description

technical field [0001] The invention belongs to the technical field of satellite navigation anti-jamming, and in particular relates to a signal processing method for space-frequency self-adaptation. Background technique [0002] When the satellite signal reaches the ground, it is only -130dBm, which is very susceptible to interference. In the complex electromagnetic environment, the vulnerability of satellite navigation has become the main factor restricting its continuous and stable positioning. Satellite navigation anti-jamming technology uses directional pattern controllable antenna array (CRPA) to adaptively generate spatial filtering weight vectors in real time and perform weighting processing, so that anti-jamming antennas can adaptively form zero traps in the direction of unknown interference in space , or form a gain in the incident direction of the satellite signal to obtain a good signal-to-noise ratio. This is of vital significance to the survivability of inerti...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S19/21G01S19/37
CPCG01S19/21G01S19/37
Inventor 白月明丁阳
Owner XIAN FLIGHT SELF CONTROL INST OF AVIC
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