Navigation anti-interference algorithm combining threshold processing and space-frequency adaptive algorithm

A space-frequency adaptive and threshold processing technology, applied in the field of satellite navigation communication, can solve problems such as input signal distortion, and achieve the effects of reducing signal distortion, suppressing spectrum leakage, and improving effects

Inactive Publication Date: 2015-09-09
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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AI Technical Summary

Problems solved by technology

[0011] The influence of spectral leakage after windowing the input signal can be improved very well, but due to the processing of the window function, the input signal will be partially distorted

Method used

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  • Navigation anti-interference algorithm combining threshold processing and space-frequency adaptive algorithm
  • Navigation anti-interference algorithm combining threshold processing and space-frequency adaptive algorithm
  • Navigation anti-interference algorithm combining threshold processing and space-frequency adaptive algorithm

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Embodiment Construction

[0027] Such as figure 2 Shown is the schematic diagram of windowing and overlapping of two signals of the present invention.

[0028] a. Divide the two signals into blocks and perform delay processing on the second signal.

[0029] Assuming that an FFT of J points is to be performed on the input signal, the input data is divided into blocks for every J data, that is, the first block of data of the first signal is:

[0030] x in1 (n)=(x(n),x(n+1),...,x(n+J-1)) (2)

[0031] where x(n)=(x 1 (n),x 2 (n),...x M (n)) T , represents the snapshot value of M array elements at the nth moment. Delay the first signal by 1 / 2 data block as the second input signal, that is, the first block of data of the second signal is:

[0032] x in2 (n)=(x(n+J / 2),x(n+J / 2+1),...,x(n+J / 2+J-1)) (3)

[0033] b. Perform windowing processing on the input signal.

[0034] Windowing a data block is actually multiplying the data block by a window function coefficient. Different window functions suppr...

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Abstract

The invention discloses a navigation anti-interference algorithm combining threshold processing and a space-frequency adaptive algorithm, and belongs to the field of satellite navigation communication. The algorithm enables a threshold processing algorithm and the space-frequency adaptive algorithm to be combined together, carries out the threshold preprocessing of a signal converted into a frequency domain at first, and then carries out the space-frequency adaptive processing, thereby effectively improves the capability of resisting narrow-band strong interference of an anti-interference system. Meanwhile, the algorithm employs a method of two-channel data stack windowing for the anti-interference processing of the signal during the space-frequency adaptive processing, effectively reducing the impact on spectrum leakage from a conventional space-frequency adaptive algorithm, and improving the performance of a system.

Description

technical field [0001] The invention belongs to the field of satellite navigation and communication, and particularly relates to the optimization of the anti-jamming algorithm in the satellite navigation system. Specifically, the signal is transformed into the frequency domain by FFT. First, a threshold algorithm is used for preprocessing in the frequency domain, and then a The two-way data window overlapping structure realizes the space-frequency anti-jamming algorithm. Background technique [0002] After humans enter the information society, the demand for geographic information is very common. The satellite positioning system has become the third new growth point of IT after communication and the Internet, and the application of global satellite positioning technology (GPS) is becoming more and more extensive. "Global Positioning System" (GPS) has played an important role in both civil and military fields, and its application range is still expanding. [0003] Navigatio...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S19/21
CPCG01S19/21
Inventor 李会勇周正张远芳李洋谢菊兰
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA
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