Design Of Wireless Acquisition Terminal For Underground Intrusion Early Warning System

Cultural relics and historic sites are an important symbol of our Chinese nation.With the passage of time,the art and historical values of these cultural relics have been gradually increased,and the theft of criminals has become increasingly rampant.At the same time,the methods for the protection of cultural relics in China are still relatively backward,resulting in a severe situation in the protection of cultural relics at the current stage.To solve this problem,this dissertation designs a low-power underground intrusion warning system.The system consists of three parts: wireless acquisition terminal,relay equipment and monitoring server.The wireless acquisition terminal achieves early warning by detecting the subsurface acoustic signal,the relay equipment reduces the false alarm rate through signal recognition algorithm processing,and monitoring server for background big data processing.The dissertation completed the hardware and software design of the wireless acquisition terminal.MSP430-based low-power data acquisition and processing system is completed on the hardware to realize real-time acquisition of underground acoustic signals,and Lora technology is used to interact with system relay devices.These include terminal sensor selection research,charge amplifier design,programmable voltage amplifier design,narrowband filter design,MSP430 minimum system and interface circuit design,power supply circuit design,PCB design and implementation.The software implements the conversion of different working modes of the terminal;ADC sampling program and FLASH read/write program are designed to realize the data collection and storage;The terminal communication protocol is designed and the communication with the system relay is realized;By extracting signal energy and rhythm features,signal feature extraction and recognition are realized.At the end of the thesis,the data acquisition test,wireless transmission function test are tested on the terminal.The results show that the designed terminal can achieve the desired effect.