A node ranging method of underwater acoustic network based on labview platform

Abstract

The invention provides a node ranging method of underwater acoustic network based on the Labview platform. The underwater acoustic network composed of N nodes performs N rounds of ranging. When the ranging request signal starts to be sent, the ranging initiation node Labview platform The RT module waits for timing. After each ranging response node completes the signal reception, each node performs an autocorrelation operation on the collected signal and the locally stored chirp ranging signal, and calculates the arrival time of the ranging request signal. After receiving the ranging response signal, the ranging initiation node performs autocorrelation calculation on the collected signal and the locally stored chirp ranging signal, and calculates the arrival time of each ranging response signal. After N rounds of testing, the entire measurement is completed. distance process. The invention improves the stability of the ranging process, improves the ranging accuracy, and has good ranging accuracy.

Description

technical field [0001] The invention relates to the field of underwater communication networking, in particular to underwater acoustics, signal detection, network access protocol, ranging technology, etc., in particular to a ranging method for underwater acoustic network nodes. Background technique [0002] The total area of ​​the ocean on the earth is about 360 million square kilometers, accounting for about 71% of the earth's surface area. The ocean contains rich biological, medical, mineral and other resources. Rational development and utilization of marine resources play a vital role in the survival and development of human beings and social activities in the case of increasingly saturated land resources. In order to satisfy human exploration of underwater space, Underwater Acoustic Networks (UAN, Underwater Acoustic Networks) have gradually been developed. Among them, network node ranging technology is one of the most basic and important technologies. High-precision no...

AI Technical Summary

Problems solved by technology

However, the program development cycle of single-chip microcomputer, DSP chip and FPGA chip is long, and the debugging method is single, and the program cannot be updated online; the program development cycle of the Labview platform is short, and the program can be debugged online in real time, and its unique top-level RealTime module and the bottom-level FPGA module are independent Running the design can realize the function of receiving and transmitting data to the real-time processor RT in the FPGA module

However, the time accuracy of the RT module is low, only at the millisecond level. Timing control in this module will cause a millisecond-level time error, which in turn will lead to a meter-level ranging error. The FPAG module has high timing accuracy, which can reach the microsecond level, but the processing The ability is limited, not enough to afford the complex program structure, and it needs to cooperate with the RT module to accurately control the predetermined delay time in the two-way TOA ranging

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