Combined Doppler estimation method for underwater acoustic communication system

A Doppler estimation and underwater acoustic communication technology, which is applied in the field of underwater acoustic communication, can solve the problems of affecting the performance of underwater acoustic communication and reducing the accuracy of estimation, and achieve the effect of accurate and reliable estimation results, less calculation, and large capture range

Active Publication Date: 2018-07-03
FUJIAN XINGHAI COMM TECH
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  • Summary
  • Abstract
  • Description
  • 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 for underwater acoustic communication system
  • Combined Doppler estimation method for underwater acoustic communication system
  • Combined Doppler estimation method for underwater acoustic communication system

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Embodiment 1

[0028] 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.

[0029] 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.

[0030] 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 suitable for an underwater acoustic communication system. The method comprises the steps of S1, performing carrier capture and coarse synchronization by adding a start frame of an LFM+CW signal; and S2, performing fine synchronization by determining a peak value offset of an LFM signal. The step S1 includes the steps: after a first LFM signal is identified by an LFM pulse compression peak value obtained by the matched filtering, the single carrier is captured and coarsely synchronized by a COSTAS ring to obtain an initial Doppler estimation result, and the sampling rate is adjusted for the first time. Compared with the prior art, the method of the invention has the advantages of accurate and reliable estimation results, small calculation amount, simple realization, strong real-time performance, easy realization and so forth.

Description

technical field [0001] The invention relates to the technical field of underwater acoustic communication, in particular to a combined Doppler estimation method suitable for an underwater acoustic communication system. Background technique [0002] 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 underwater communication due to its advantages of high data transmission rate and high reliability. However, OFDM has relatively high requirements on frequency accuracy. When there is a frequency offset, the orthogonality of subcarriers is destroyed, which will caus...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L27/26H04L27/00H04B13/02
CPCH04B13/02H04L27/266H04L27/0014Y02D30/70
Inventor 张晶骋黄奇家卢玉灿左景帅
Owner FUJIAN XINGHAI COMM TECH
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