Underwater acoustic network node mutual distance measurement method based on gamma distribution model

Abstract

The invention provides an underwater acoustic network node mutual distance measurement method based on a gamma distribution model; the TDOA distance measurement process of multiple response mechanism is finished through certain time distribution strategy for the underwater communication network composed of N sub-nodes and one main control node and the range information is corrected based on gamma model. The distance measurement information is corrected and compensated for offering reliable guarantee for improving location accuracy. The underwater acoustic network node mutual distance measurement method based on the gamma distribution model takes full advantage of slower propagation speed of the sound in the water and adopts multiple response mechanism on distance measurement request signal for improving the distance measurement operation precision and efficiency.

Description

technical field [0001] The invention belongs to the field of underwater acoustic communication and relates to related subjects such as underwater acoustics, statistical signal detection and parameter estimation theory, probability theory, underwater acoustic communication and the like. Background technique [0002] With the acceleration of ocean development in various countries in the world, the research on ocean hydroacoustic communication has become a worldwide research hotspot. Ranging between underwater acoustic network nodes is one of its most basic and important functions, and it is the basis for realizing network-based detection and tracking tasks. [0003] The underwater acoustic ranging method commonly used in engineering is based on the TDOA (Time Difference of Arrival) method at the requesting ranging end and the responding ranging end. By calculating the propagation delay between the transmitting end and the receiving end, and according to the underwater acoustic...

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Problems solved by technology

However, in the actual process, there is a problem of detection error for the leading edge of the ranging signal pulse, which causes the distance information to be too large, which does not fully conform to the characteristics of the Gaussian distribution, thus affecting the positioning accuracy of the network nodes.

[0007] (2) The ranging information has not been effectively corrected

Due to the slow propagation speed of sound in water (1500m / s), the time period of each ranging task is relatively long. Using such a single response mechanism cannot make full use of the limited time to complete multiple ranging processes.

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