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Single-antenna Beidou satellite signal wavelet decomposition anti-interference algorithm

A Beidou satellite and wavelet decomposition technology, applied in satellite radio beacon positioning system, radio wave measurement system, measuring device, etc., can solve the problem of removing interference signals and not being able to effectively apply hand-held and portable Beidou satellite navigation equipment

Inactive Publication Date: 2015-07-15
TAIYUAN UNIV OF TECH
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Problems solved by technology

[0004] In order to solve the problem that the existing method for removing interference signals cannot be effectively applied to hand-held and portable Beidou satellite navigation equipment, the present invention provides a single-antenna Beidou satellite signal wavelet decomposition anti-interference algorithm

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  • Single-antenna Beidou satellite signal wavelet decomposition anti-interference algorithm

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Embodiment Construction

[0013] The single-antenna Beidou satellite signal wavelet decomposition anti-jamming algorithm includes the following steps:

[0014] Step 1: Decompose the intermediate frequency signal converted by the receiver using the 117local wavelet derived from the Meyer mother wavelet orthogonally to obtain multiple frequency band signals;

[0015] Step 2: The signals of each frequency band are decomposed by the three-layer wavelet of the filter bank, output the power spectral density, compare the energy of each frequency band signal, and then detect the position of interference in each frequency band signal, and according to the required false alarm probability or missed detection probability Set the threshold to detect the frequency range in which interference exists;

[0016] Step 3: Attenuate the coefficients of the frequency range where the interference is detected in each frequency band signal to remove the interference;

[0017] Step 4: Carry out wavelet inverse transform on th...

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Abstract

The invention relates to the technical field of satellite navigation and signal processing, in particular to a single-antenna Beidou satellite signal wavelet decomposition anti-interference algorithm. The single-antenna Beidou satellite signal wavelet decomposition anti-interference algorithm comprises the following steps: firstly, decomposing medium-frequency signals by using Meyer wavelets to obtain signals of all frequency bands; secondly, by comparing energy of the decomposed signals of all frequency bands, detecting a frequency band range of narrowband interference noises, and by attenuating the coefficient of the frequency band range to which the interferences belong, reconstructing signals to remove the narrowband interferences. Experimental simulation proves that by the single-antenna Beidou satellite signal wavelet decomposition anti-interference algorithm, narrowband continuous wave interference can be resisted under the condition of a single antenna, and the sensitivity of a receiver can be increased by about 5 dB; in allusion with characteristics of a single-antenna intelligent terminal, the modern signal processing method is provided based on wavelet decomposition-reconstruction to remove interferences.

Description

technical field [0001] The invention relates to the technical field of satellite navigation and signal processing, in particular to a single-antenna Beidou satellite signal wavelet decomposition anti-jamming algorithm. Background technique [0002] With the rapid development of the Beidou navigation system, its application in production and life has increasingly affected and changed our lives. With the rapid popularization of portable intelligent terminals such as smart phones, navigation and positioning based on portable intelligent terminals has developed rapidly, and the anti-interference performance of navigation and positioning equipment has become a key factor related to its operation stability. In the complex downtown environment, there are many continuous wave interferences, such as WIFI signals, Bluetooth, taxi dispatching stations, etc. Among them, there are in-band interferences and interferences caused by harmonic components penetrating into this frequency band, ...

Claims

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Application Information

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IPC IPC(8): G01S19/37
CPCG01S19/37G01S19/21
Inventor 李灯熬李帅赵菊敏牛文慧
Owner TAIYUAN UNIV OF TECH
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