Mobile frequency hopping underwater acoustic communication Doppler factor estimation method

A Doppler factor and underwater acoustic communication technology, which is applied in the field of Doppler factor estimation in mobile frequency hopping underwater acoustic communication, can solve the problems of not considering the change process of Doppler frequency offset factor, reduced accuracy, and inability to adapt , to achieve the effect of accurate Doppler frequency offset factor estimation results

Active Publication Date: 2019-08-09
HARBIN ENG UNIV
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Problems solved by technology

[0005] The above several Doppler estimation methods have considered the Doppler frequency offset factor estimation within a single symbol or frame signal in a short period of time, but have not considered th

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  • Mobile frequency hopping underwater acoustic communication Doppler factor estimation method
  • Mobile frequency hopping underwater acoustic communication Doppler factor estimation method
  • Mobile frequency hopping underwater acoustic communication Doppler factor estimation method

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Embodiment Construction

[0059] Further describe the present invention below in conjunction with accompanying drawing:

[0060] like figure 1 As shown, a mobile frequency hopping underwater acoustic communication Doppler factor estimation method includes the following steps:

[0061] Step 1: Synchronize the communication signal at the receiving end. When synchronizing, copy and correlate the received signal with the local training sequence reference signal, and search for the peak position of the correlation result to determine the starting time of the training sequence;

[0062] After determining the starting time of the training sequence, the code elements in each training sequence can be intercepted according to a certain slice selection strategy, such as extended slice selection, fixed-length slice selection, and other methods.

[0063] Step 2: measure the Doppler frequency offset factor by chip for the training sequence in the received signal, and obtain the initial Doppler frequency offset fact...

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Abstract

The invention belongs to the technical field of underwater acoustic communication, and discloses a mobile frequency hopping underwater acoustic communication Doppler factor estimation method, which comprises the following steps of synchronizing communication signals at a receiving end, and intercepting a chip; carrying out doppler frequency offset factor measurement on the intercepted chip to obtain a Doppler frequency offset factor estimation result, wherein the pre-selected wavelet basis function is used as a wavelet basis function for denoising; decomposing the Doppler frequency offset factor estimation result to obtain an approximation coefficient and a detail coefficient; calculating a threshold value; performing soft threshold denoising on the detail coefficient; reconstructing the Doppler frequency offset factor; grouping Doppler frequency offset factor optimization results, and taking the median of each group to represent the group; predicting the median of the next group of Doppler frequency offset factors; and selecting the next group of chips, and repeating the steps to predict the median of the next group of Doppler frequency offset factors. According to the method, theoptimal de-noising wavelet basis function is selected, estimation errors caused by inaccurate synchronization and inaccurate chip selection are eliminated, and a more accurate Doppler frequency offset factor estimation result is obtained.

Description

technical field [0001] The invention belongs to the technical field of underwater acoustic communication, and in particular relates to a method for estimating a Doppler factor in mobile frequency hopping underwater acoustic communication. Background technique [0002] With the implementation of the national marine strategy, underwater acoustic communication technology has received high attention and development, and has been widely used in various military and civilian fields, such as data and control command communication of unmanned underwater vehicles. As an important carrier of ocean detection and underwater acoustic communication, underwater vehicles have become a research hotspot in the field of ocean engineering in various countries. Underwater vehicles have the characteristics of concealment, maneuverability, and economy. [0003] Different from radio communication on land, the propagation speed of underwater sound is only about 1500m / s, and the propagation speed of...

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Application Information

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IPC IPC(8): H04L27/00H04B13/02
CPCH04B13/02H04L27/0014H04L2027/0026
Inventor 刘凇佐乔钢赵云江马璐
Owner HARBIN ENG UNIV
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