A Block Frame Synchronization Method for Remote Underwater Acoustic Communication
A technology of underwater acoustic communication and frame synchronization, applied in multiplex communication, time division multiplex system, electrical components, etc., can solve on-chip storage resource and computing resource shortage, affecting computing speed, real-time processing of unfavorable signals, etc. problem, to achieve the effect of reducing computational complexity, reducing storage space, and overcoming large storage occupation
Active Publication Date: 2020-06-16
INST OF ACOUSTICS CHINESE ACAD OF SCI
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In order to achieve the long-term on-duty goal of the system, the small underwater unmanned platform usually adopts a low-power embedded system, and the on-chip storage resources and computing resources are relatively tight. Using traditional methods to calculate large-length synchronization correlations for signal frame synchronization will Occupies a large amount of storage resources, further affects the calculation speed, and is not conducive to the real-time processing of signals
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[0031] A block frame synchronization method for remote underwater acoustic communication provided by the present invention will be further explained below in conjunction with specific drawings and embodiments.
[0032] A flow chart of a remote underwater acoustic communication block frame synchronization method provided by the present invention, as shown in figure 1 As shown, the specific description is as follows:
[0033] In order to ensure robust communication performance under ground signal-to-noise ratio, long-distance underwater acoustic communication systems usually transmit a synchronization signal with good correlation characteristics before the useful signal for frame synchronization, such as M sequence, chirp signal, hyperbolic FM signal, etc. Considering the interference of the Doppler effect in actual communication, a hyperbolic FM signal with good Doppler invariance is used as the synchronization signal here, the system sampling rate is Fs, and the length of the ...
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The invention relates to a remote underwater acoustic communication signal block frame synchronization method, which comprises the following steps of: dividing a frame synchronization signal with the length of N into K sub-signals with the length of M at a receiving end by using a hyperbolic frequency modulation signal as a frame synchronization head, and respectively calculating the sliding correlation of each sub-signal at the current moment by using a frequency domain correlation algorithm; delaying the correlation result of the current moment by M points and then adding the correlation result of the current moment and the correlation result of the previous moment; taking the first M points of the result after delay superposition as a calculation result of current time frame synchronization; and searching the arrival time of the synchronization signal from the calculation result of every K times of frame synchronization to complete frame synchronization. According to the method, the defect that a traditional method occupies large storage space is overcome under the condition that the frame synchronization performance is not reduced, meanwhile, the calculated amount is reduced, and the method is suitable for the large-point-number frame synchronization process in remote underwater acoustic communication.
Description
technical field [0001] The invention relates to the technical field of underwater acoustic communication, in particular to a block frame synchronization method for remote underwater acoustic communication. Background technique [0002] Small underwater unmanned platforms such as shallow buoys and buoys have the characteristics of intelligence, concealment, and economy, and are light in weight, small in size, and easy to use. They are widely used in marine environment monitoring, marine resource exploration, and other fields. Reliable information transmission between a small underwater unmanned platform and its mother ship or base station is a necessary guarantee for its ability to complete the tasks it performs, and frame synchronization, as a key technology in underwater acoustic communication, directly affects the quality of underwater information transmission. The function of frame synchronization is to accurately obtain the starting position of the signal frame in underw...
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IPC IPC(8): H04J3/06H04B13/02
CPCH04B13/02H04J3/0617
Inventor 普湛清黄海宁李宇王巍
Owner INST OF ACOUSTICS CHINESE ACAD OF SCI