| Due to the rapid development of communication technology,the Internet of Things technology is used in various fields that are closely related to our lives.Of course,it also proposes new solutions for the problems existing in current fire alarm systems.As a novel video application solution,distributed compressive sensing technology transfers the computational complexity from the video encoding end to the decoding end.This technology has a wide range of application scenarios,especially in mobile video communications,field environment monitoring and security scene.The focus of this paper is to design and implement a smart fire alarm system based on wireless sensor networks.First of all,in view of the scene of fire alarming,this paper combines the distributed compressive sensing technology and wireless sensor network technology to analyze the demand and performance of the system.Then the overall architecture of the system is designed.The hardware and software implementation of each function module is introduced in detail.The data acquisition and coding of the sensor node is realized.The Ad Hoc network is constructed for data transmission and the video decoding is completed at the back end.Secondly,considering the measurement process of compressive sensation,it is considered that the random performance of the selected deterministic measurement matrix is poor,which is not conducive to the reconstruction of the back-end original signal.An optimization method based on the orthogonal symmetry Toeplitz deterministic measurement matrix is proposed,which is to improve the friendliness in hardware.The simulation results show that the optimized measurement matrix is easier to implement in hardware and the number of independent variables is greatly reduced,thus reducing the burden of system storage and calculation.Finally,this paper completes the construction and implementation of the sensor node and system platform and tests the system from both aspects of function and performance.The test results show that the intelligent fire alarm system based on the wireless sensor network designed in this paper can timely detect the occurrence of fire and synchronize the alarm.Compared with the traditional fire alarm system,the fire alarm system designed in this paper is more advanced in terms of mode monitoring methods and fire alarm decisions.The reliability of automatic fire alarm systems has been greatly improved. |
