Research On Wireless Sensor Network TDOA Localization Algorithm

In wireless sensor network system, its most important core part is the sensor, application scope of nodes is facing the general use of users and all kinds of science and technology innovation range, the function of the key is to provide reliable and accurate, real-time data. Positioning technology, as will the "core" and "key" connection link, in its importance, even if sensor is cost, powerful, transmission network speed leap to ascend, the user interface is concise easy handling, and no reasonable positioning technology, the wide application of wireless sensor network will halt, so, improve node localization algorithm for ascension network performance is of great significance.This paper first reviews the development of wireless sensor network, studies its can realize each function, combining domestic and foreign in sensor, network mode, positioning technology research status and thorough analysis in the process of analysis, choose this paper research direction, and finally in node localization algorithm on get breakthrough, and subsequent algorithms to unfold. Secondly gives the basic concept of wireless sensors, analyzes the basic unit and all WSN in its network of its main function, in the category of the location algorithm, this paper introduces the theory of three classical algorithm. The superiority of the proposed the location algorithm, analyze and study the current application three algorithms, sorting algorithm improving methods.Through the engineering application algorithm TDOA technology: check grace TDOA technology application of mathematics, algorithms, least-square algorithm TDOA technology of the weighted least-square method of analysis and research, according to handle the design idea of improving precision, and gradually put localization algorithm was improved, accurate effectively reduced the error, and the last above the three algorithm was put forward on the basis of using the weighted centroid algorithm and the introduction of approximate distance estimation factors on the experimental data processing of convergence.Finally on MATLAB cross-correlation function method, and simulation to get accurate multiple signal time delay; Will the data as three algorithm based data, to three algorithm, experimental results of experimental data carried on the detailed analysis of the comparative; Above three algorithm data algorithm, the weighted centroid algorithm processed this three kinds of algorithms,the improved algorithm of secondary processing performance, finally proposed the improvement in system design algorithm can application of conclusion.A large number of experimental data shows that the TDOA localization of weighted processing center in the actual network algorithm can be applied.