Design And Implementation Of The Underwater Aeromodelling Remote Control Receiver System

With the rapid development of science and technology in the field of ocean energy exploration, ocean physics research and underwater surveillance control of military target,underwater communication technology has been rapidly developed. As a research direction of the communication technology, underwater acoustic remote control technology realizes the control and information transfer instructions through the communication transmission of remote control. In the field of communication rate, error rate and reliability, underwater acoustic remote control technology is different from underwater acoustic communication,mainly emphasizing the reliability of the relay and low error rate.In the process of ship design, in order to verify the reliability of the design, the technical indicators of ships' shape and control need to be tested by performing various experiments in the model aircraft pool. During the test of some models such as submarine and AUV, some control commands need to be send to model aircraft by underwater acoustic remote control system. Due to the fact that the towing of cable measurement and control system will affect the model's navigation, the support of the wireless underwater acoustic remote control system is very necessary.The main task of the thesis is to complete the design and implementation of aeromodelling remote control receiver system. The selection of system parameters and multiple frequency shift keying telecommand coding way is based on the characteristics of aeromodelling in the acoustic environment. The design is based on the adaptive filter instruction decoding algorithm which is realized on FPGA. And theoretical analysis and MATLAB simulation to the algorithm are also finished. In the hardware design part, the design and debugging on both of receiver signal conditioning circuit and digital collection and processing circuit is completed, making the remote control signal collected by hydrophone amplified, filtered, and voltage-controlled gain controlled, also making the collected signal analyzed and decoded. In the digital signal processing part, the decoding of adaptive filter is implemented mainly through the VHDL hardware description language programming procedure. Then the results of decoding are send to the execution system by the MSP430 microcontroller to implement the communication control function.