A vhf multipath signal measurement and processing system based on fractal theory

Abstract

The invention belongs to the field of radio wave propagation and particularly relates to a VHF (very high frequency) multipath signal measurement processing system based on fractal theory, comprising: a received signal time series decomposition and reconstruction module for decomposing and reconstructing time series for a VHF signal; fractal dimension calculating module 1, 2 and 3 for calculating fractal dimension of the reconstructed received signal; a fractal noise reconstruction module for reconstructing a fractal noise signal; a fractal noise stripping module for performing fractal noise stripping calculation on the reconstructed fractal noise signal; a VHF signal reconstruction module for reconstructing the VHF signal with the fractal noise stripped; a fractal dimension analysis and calculation module for analyzing and calculating fractal dimension; a VHF signal wavelet reconstruction module for performing wavelet reconstruction on the received VHF signal. Compared with the prior art, the VHF multipath signal measurement processing system based on fractal theory has the advantages that the defect can be effectively overcome that a traditional VHF signal multipath fading model is unable to adapt flexibly to complex channel environments, and experimental basis is provided for a receiving terminal to accurately reconstruct signals.

Description

technical field [0001] The invention belongs to the field of radio wave propagation, relates to the cross-applied subject of land-based positioning signal processing and radio wave propagation, and specifically relates to a VHF multipath signal measurement and processing system based on fractal theory. Background technique [0002] In the actual navigation environment, the ship's movement and the sea surface environment are changing in real time, which makes the channel environment of the multipath fading signal extremely complicated, and it is difficult to find a suitable mathematical method to analyze, study and process it accurately. The traditional propagation model is not only low in authenticity, but also needs to use different models under different environmental conditions. The mutual switching between such models has high requirements for the design of the receiver, and in the case of fast fading and deep fading In this case, only the channel parameters can be estim...

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Problems solved by technology

[0002] In the actual navigation environment, the movement of the ship and the sea surface environment are changing in real time, which makes the channel environment of the multipath fading signal extremely complicated, and it is difficult to find a suitable mathematical method to accurately analyze, study and process it

The traditional propagation model is not only low in authenticity, but also needs to use different models under different environmental conditions. The mutual switching between such models has high requirements for the design of the receiver, and in the case of fast fading and deep fading In this case, only the channel parameters can be estimated, resulting in poor positioning and ranging accuracy using the received VHF signal, so a new signal measurement processing method is needed to solve this problem

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