Design And Implementation Of Multifunctional Transponder Based On STM32

The long baseline underwater acoustic positioning system can achieve the navigation and positioning of the underwater cooperation target,in which the transponder is one of the basic components of the system.Due to the battery power limit,the power consumption problem is one of the most important problems that the transponder considers when selecting the chip.In this paper,STM32F4 chip with high performance,low cost,low power consumption and so on,completed the STM32F4 chip based on the transponder digital circuit design and implementation.This paper first studies the transponder signal processing algorithms.Single-frequency signal detection method using adaptive notch filter and instantaneous frequency variance combined detector,broadband signal detection method using fast sliding correlation filter.In this paper,the principle of the above algorithm and the detection performance are simulated and analyzed.The composition of the underwater acoustic command signal and the signal processing method are studied.Due to the limited resources of the underwater acoustic channel,the use of code division multiple access technology instead of frequency division And the number of reproducible transponders in the same sea area is increased,and the related characteristics of the m sequence used in the code division multiple access technology are simulated and analyzed,and the feasibility of the method is studied.And then on the basis of the transponder digital end of the design.The serial communication module is designed on the STM32F4IGT6 chip to realize the parameter setting of the transponder.The single-frequency and wide-band interrogation signals and the detection signals of the underwater acoustic command are realized.The data storage function is realized to facilitate the analysis of the underwater environment The design of the reply signal module is completed,including the reply to the single frequency response signal,the FM response signal,the m sequence modulation response signal and the underwater sound remote control command signal.In order to facilitate the management and debugging of the program,in the transponder software design,from the function,the program is divided into different functional modules,and the use of UCOSIII operating system,improve the program readability and scalability.The design of the transponder digital circuit through laboratory testing to verify the transponder design functions have been achieved,the total power consumption and board space than the previous generation transponder has been significantly reduced,and the software system robust and reliable,Good performance for the next generation based onSTM32F4 transponder design provides the basis.