A channel simulation method for underwater mobile

Abstract

The invention discloses an underwater mobile channel simulation method. The method comprises the following steps: 1) setting environmental parameters and signal parameters of a three-dimensional underwater space communication scene, establishing a motion model of an acoustic source emission platform and a receiving platform and a sea surface height model; 2) real-timely sampling the state of the channel by calling the ray track model for many times to obtain a series of channel snapshots at different time, and calculating a time-varying channel impulse response according to the obtained snapshots; 3) dynamically filtering the transmit signal of the acoustic source transmitting platform in the time domain by using the time-varying channel impulse response to obtain the received signal. Themethod of the invention ensures the accuracy and the precision of the underwater mobile communication channel simulation to a certain extent, and at the same time, the complexity of the simulation realization can be effectively reduced, the memory requirement can be reduced, and the computer operation efficiency can be improved.

Description

technical field [0001] The invention relates to the field of underwater acoustic communication, in particular to an underwater mobile channel simulation method. Background technique [0002] In underwater acoustic communication, the movement of the communication platform and the movement of sea water itself will bring strong channel time variation and Doppler expansion, which will seriously affect the communication quality. In order to effectively evaluate the performance of the communication system or system module under the condition of the underwater communication platform moving or the propagation medium moving, it is necessary to simulate the underwater mobile communication channel. [0003] For shallow water acoustic mobile communication scenarios, a relatively simple channel simulation implementation method is: firstly calculate the relevant information of each intrinsic sound ray of the static channel through the ray model, such as propagation delay, attenuation and ...

AI Technical Summary

Problems solved by technology

[0005] The existing underwater mobile channel simulation method based on primary acoustic ray tracking only considers the first-order dynamic characteristics of the channel, and cannot accurately simulate the channel multipath structure changes under the conditions of significant time-varying channel and strong medium level dependence, and the scope of application is very wide. limitations

However, the existing simulation methods based on multiple sound ray tracing usually preset a fixed channel snapshot frequency

This approach often has a large degree of arbitrariness, lacks a clear criterion, and the parameter selection mechanism is not flexible enough to adjust the sampling frequency of the channel state according to the speed of the actual channel change.

Once the channel snapshot frequency setting is unreasonable, the accuracy or efficiency of the entire channel simulation will be greatly affected: if the channel snapshot frequency is too low, the simulation results may not be able to keep up with the rapid changes in the actual channel structure; If the frequency is too large, it will lead to an increase in computing time and a waste of computing resources

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