Design And Development Of Acoustic Release Based On FH-FSK

Frequency hopping frequency shift keying(FH-FSK)is a relatively robust and easy-to-implement communication method.It has strong channel adaptability and is often used for communication between underwater nodes.It is also suitable for low-rate and highly reliable underwater acoustics.Application areas such as equipment remote control.In the development of acoustic releasers,communication reliability,release success rate,standby time,equipment complexity,etc.are all issues that need to be considered when designing.This paper studies the performance of the FH-FSK system in underwater acoustic communication.At the same time,based on the FH-FSK system,a lightweight acoustic release device suitable for shallow waters is developed.The thesis first carries out the design of underwater acoustic remote control algorithm based on FH-FSK.The application model of the frequency hopping system in underwater acoustic communication,the system parameter control relationship and the frequency hopping sequence generation method based on RS code are studied;for the reception of frequency hopping signals,the focus is on the underwater acoustic signal solution based on the adaptive Notch filter.Tuning algorithm.Then,for the detection method of the FH-FSK system based on the Notch filter proposed in this paper,the actual characteristics of the shallow water acoustic channel are fully considered,simulation analysis and comparison verification are carried out under three different channel conditions,and combined with the underwater acoustic environment The processing of the test data verifies the robustness of the system in the actual complex underwater acoustic channel,and provides theoretical support for the realization of reliable shallow water acoustic remote control communication.The system design of the acoustic releaser includes the design of communication parameters,hardware circuits and mechanical structure.The thesis starts with the working principle of the acoustic release and carries out the overall modular design,including the transceiver module,signal receiving module,signal transmitter module,core control module,motor module,tilt sensor module,battery management module,and transceiver module.And mechanical release mechanism.Based on the research of the releaser's technical indicators and FH-FSK performance,the frequency hopping communication parameters applied to the releaser are designed.On the hardware system,the main structure,main circuit and motor drive release mechanism of the release are designed;at the same time,the necessary driver programs are developed,and the connection between the hardware and software is well connected,and finally the release based on MSP430 is carried out.Software development,its software system mainly includes signal receiving module,signal decoding module,instruction execution module and response feedback module;signal receiving and decoding module combines band-pass sampling design and high-reliability,easy-to-implement synchronous detection method and Notch-based filtering The frequency hopping information decoding method of the device.At the end of the thesis,the design of the remote control algorithm of the acoustic releaser,system design and software platform realization were combined to develop a complete underwater acoustic releaser,and the system was tested;at the same time,the channel pool and Songhua River of Harbin Engineering University,Qiandao Lake and other waters to carry out system tests.The results show that the low-complexity robust remote control algorithm based on FH-FSK proposed in this paper has good real-time performance,robustness and reliability;the acoustic releaser developed in this paper based on FH-FSK has robust communication capabilities and low power consumption.At the same time,various functions such as release,lock,power query,attitude query,and response feedback are perfect.