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Combined Doppler estimation method based on dynamic adjustment of sampling rate

A technology of Doppler estimation and dynamic adjustment, which is applied in the direction of carrier adjustment, multi-frequency code system, modulated carrier system, etc., can solve the problems such as the decrease of estimation accuracy and the influence of underwater acoustic communication performance, and achieve less computation and better estimation results. Accurate and reliable, achieve simple results

Active Publication Date: 2020-12-15
FUJIAN XINGHAI COMM TECH
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  • Claims
  • Application Information

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Problems solved by technology

However, when the initial frequency offset is too large and the multipath effect is obvious, the estimation accuracy will be greatly reduced due to the multipath effect, which seriously affects the performance of underwater acoustic communication.

Method used

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  • Combined Doppler estimation method based on dynamic adjustment of sampling rate
  • Combined Doppler estimation method based on dynamic adjustment of sampling rate
  • Combined Doppler estimation method based on dynamic adjustment of sampling rate

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Embodiment 1

[0029] Embodiment 1 of the present invention is: a combined Doppler estimation method applicable to an underwater acoustic communication system, comprising the following steps: S1, performing carrier capture by adding an initial frame of an LFM+continuous wave (continuous wave, CW) signal and coarse synchronization; S2, performing fine synchronization by measuring the peak shift of the LFM signal.

[0030] Specifically, such as figure 1 As shown, the format of the design frame is as follows: the length of a frame is 120ms, in which the LFM is at the frame header, the length is 30ms, the initial frame is a synchronous frame, and the 90ms in a frame except for the LFM is a 6kHz single carrier; the subsequent frames are data Frame, 90ms is OFDM modulation signal. When sending a signal, the start frame and data frame are sent continuously, and there is no end frame.

[0031] After the first LFM signal is identified through the LFM pulse compression peak obtained by matched filte...

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Abstract

The invention discloses a combined Doppler estimation method based on dynamic adjustment of a sampling rate. The combined Doppler estimation method comprises the steps of S1, adding a starting frame of an LFM+CW signal to carry out carrier capture and coarse synchronization; and S2, carrying out fine synchronization by measuring the peak value offset of the LFM signal. The step S1 comprises the steps of after a first LFM signal is identified by an LFM pulse compression peak value obtained by matched filtering, achieving capture and coarse synchronization of a single carrier through a COSTAS ring to obtain an initial Doppler estimation result, and adjusting the sampling rate for the first time. Compared with the prior art, the method has the advantages of being accurate and reliable in estimation result, small in calculation amount, easy to implement, high in real-time performance, easy to implement and the like.

Description

[0001] This case is a divisional application based on the patent application with the application number 201810025927.9, the application date is January 11, 2018, and the title is "A Combined Doppler Estimation Method Applicable to Underwater Acoustic Communication System". technical field [0002] The invention relates to the technical field of underwater acoustic communication, in particular to a combined Doppler estimation method based on dynamic adjustment of sampling rate. Background technique [0003] With the frequent development of oceans, the underwater acoustic communication system has great application value not only in the military field, but also in the civilian field. Such as marine water quality monitoring, marine disaster early warning, resource exploration, etc. The underwater acoustic communication system based on multiple-input multiple-output Orthogonal Frequency Division Multiplexing (OFDM) has become an important development direction in the field of un...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L27/26H04B13/02
CPCH04B13/02H04L27/266H04L27/0014Y02D30/70
Inventor 张晶骋黄奇家
Owner FUJIAN XINGHAI COMM TECH
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