Research On Spatially Correlated Time Series Detection In Wireless Sensor Networks

Wireless Sensor Network(Wireless Sensor Networks, abbreviated WSN) is a kind of advanced wireless communication technology, which based on a wireless sensor and the physical environment, and the development of embedded system technology to the level of electronic technology is mature and stable. In recent years, with the rapid development of Internet and increasing degree of attention, WSN as a new type of Internet of things, the source of perceived environmental information, has been attracting more and more researchers on its perceived ability, low energy energy-saving, research has sensors for processing.In this thesis, several common signal detectors are introduced, including covariance detector, energy detector, and enhanced covariance detector, and then it introduces the MSC detector with spatial correlation and GC detector,(the GC detector is the MSC detector, extended from two to three and combined detection of multi joint detection). On this basis, this paper is introduced at the same time with time and space double correlation detector: GLRT detection. GLRT detector is composed of time domain and frequency domain under GLRT detector and GLRT detector is a new type of detector, a multi-channel multi-node detector, it will change time series measured at different positions of the sensor in the area available to transform a contains the sample matrix of time and space, and the time for detection of GLRT Frequency domain of the GLRT detector is generated by the matrix operation on the basis of the sample matrix. And the core of this paper, based on the basis of the existing theory of GLRT, is that time domain GLRT detector and frequency-domain GLRT detector are simulated and the theoretical research for its application in two-dimensional plane coverage and three-dimensional space coverage, which is compared with other detectors, gives the best choice of practical application.Study on the signal of the detector is of great significance for the practical application of WSN sensor network. The core of this thesis is to test the area of signal source and detector, perception, a direct impact on the wireless sensor network system performance and efficiency; then, how to test the coverage area of the same size on the premise of ensuring. As far as possible to reduce the number of sensor nodes, how to use the relationship between the position relationship and signal acquisition time between nodes, each node in the ability to perceive limited circumstances, improve the performance of the detector node group, are key issues about WSN research. This thesis is on the basis of solving the above two problems. In view of the traditional detector, the detector has the spatial correlation and the detector which has the time and space correlation,by comparing the coverage effect of two dimensional coverage and three dimensional space coverage under different conditions,it gives the best choice in this paper.