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A Doppler Factor Estimation Method for Mobile Frequency Hopping Underwater Acoustic Communication

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

Active Publication Date: 2021-09-28
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 the Doppler frequency offset of multiple symbols or continuous frame signals The change process between factors reduces the accuracy and cannot meet the requirements of modern underwater acoustic communication

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  • A Doppler Factor Estimation Method for Mobile Frequency Hopping Underwater Acoustic Communication
  • A Doppler Factor Estimation Method for Mobile Frequency Hopping Underwater Acoustic Communication
  • A Doppler Factor Estimation Method for Mobile Frequency Hopping Underwater Acoustic Communication

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Embodiment Construction

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

[0060] Such as 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 f...

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Abstract

The invention belongs to the technical field of underwater acoustic communication, and discloses a method for estimating the Doppler factor of mobile frequency-hopping underwater acoustic communication. The communication signal is synchronized at the receiving end, and chips are intercepted; and the Doppler frequency offset factor is performed on the intercepted chips. Measure and obtain the estimation result of Doppler frequency offset factor; pre-select the wavelet basis function as the wavelet basis function for denoising; decompose the estimation result of Doppler frequency offset factor to obtain the approximate coefficient and detail coefficient; calculate the threshold threshold; perform soft thresholding on the detail coefficient noise; reconstruct the Doppler frequency offset factor; group the Doppler frequency offset factor optimization results into groups, and take the median value of each group to represent the group; predict the median value of the next group of Doppler frequency offset factors; The next group of chips is selected, and the steps are repeated to predict the median value of the next group of Doppler frequency offset factors. The present invention selects the optimal denoising wavelet basis function, eliminates estimation errors caused by inaccurate synchronization and inaccurate slice selection, and obtains more accurate Doppler frequency offset factor estimation results.

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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Patent Type & Authority Patents(China)
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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