Underwater Acoustic Doppler Estimation Method and Device, Underwater Acoustic Communication Method and System
A Doppler estimation and signal technology, applied in the field of communication methods and systems, underwater acoustic Doppler estimation methods and devices, can solve the problems that time-varying multipath underwater acoustic channels cannot be directly used, and there is no effective solution. Low requirements for variable speed, easy engineering implementation, and high precision effects
Active Publication Date: 2021-03-12
浙江望海潮科技有限公司
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[0050] Therefore, this method cannot be directly applied to the actual time-varying multipath underwater acoustic channel, and there is currently no effective solution to this problem
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[0098]In order to more clearly illustrate the purpose, technical solutions and advantages of the present invention, specific examples are given below to further describe the present invention in detail.
[0099] In the traditional method, the ultimate goal of selecting the correlation peaks of the up / down hyperbolic FM signals corresponding to the same path is to obtain the distance between the correlation peaks, but in practice, due to the complex multipath environment and fast time-varying nature of the underwater acoustic channel, the selection of the correlation peaks difficulty. The present invention proposes a new scheme, which uses the waveform structure of the matched filter output of the up / down hyperbolic FM signal at the receiving end to automatically adapt to the time-varying multipath channel, and directly obtains the correlation peak distance without selecting a single correlation peak.
[0100] The channel impulse response of a multipath channel can be modeled a...
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The invention relates to the field of underwater acoustics, in particular to an underwater acoustic Doppler estimation method and device, a communication method and a system based on a hyperbolic FM signal. The present invention sends two hyperbolic FM signals at the transmitting end, and re-correlates the matched filter output of the first hyperbolic FM signal with the matched filtering output of the second hyperbolic FM signal at the receiving end, thereby obtaining the first hyperbolic FM signal The overall relative time shift of the matched filter output of the hyperbolic FM signal and the second hyperbolic FM signal is used to estimate the Doppler factor. On the basis of maintaining the advantages of the traditional Doppler estimation method based on hyperbolic FM signal, this method reduces the estimation error in the actual time-varying multipath underwater acoustic channel and improves the robustness of the estimation. This method can be used in a variety of underwater acoustic systems that require Doppler estimation, and has broad application prospects.
Description
technical field [0001] The invention relates to the field of underwater acoustics, in particular to an underwater acoustic Doppler estimation method and device, a communication method and a system based on a hyperbolic FM signal. Background technique [0002] Underwater acoustic communication is currently the only technology capable of long-distance communication underwater. The speed of sound in water is about 1500m / s, much lower than the 3×10 electromagnetic waves in wireless communication 8 m / s propagation speed, so the Doppler effect in underwater acoustic communication is far more serious than that in wireless communication. The Doppler effect will distort the received signal, thereby affecting the subsequent synchronization, demodulation, decoding and other processing at the receiving end, increasing the system bit error rate and reducing system reliability. Therefore, in underwater acoustic communication, the estimation and compensation of Doppler is an indispensabl...
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IPC IPC(8): H04L27/00H04L27/26H04B13/02
CPCH04B13/02H04L27/0014H04L27/2657H04L2027/0026
Inventor 鄢社锋徐立军
Owner 浙江望海潮科技有限公司