Target location method for wireless sensor network based on rss-toa in non-line-of-sight environment

Abstract

The invention discloses a wireless sensor network target positioning method based on RSS-ToA in a non-line-of-sight environment, which firstly constructs a measurement model of the RSS measurement value corresponding to the anchor node and a measurement model of the ToA measurement value; After simplification, approximate deformation is carried out; according to the approximate deformation expression of the simplified measurement model of the RSS measurement value and the approximate deformation expression of the simplified measurement model of the ToA measurement value, and using the least squares criterion, the non-convex localization problem is obtained; by introducing relaxation variables and auxiliary variables to transform the non-convex localization problem into a non-convex constrained optimization problem; adopt the second-order cone relaxation method to obtain the second-order cone programming problem; use the interior point method to solve the second-order cone programming problem, and obtain the target node in the reference The final estimated value of the coordinate position in the coordinate system; the advantage is that it makes full use of the two measurement information of received signal strength and arrival time, and can obtain the global optimal solution, which greatly improves the target positioning accuracy.

Description

Technical field[0001]The invention relates to a target positioning method, in particular to a wireless sensor network target positioning method based on RSS-ToA in a non-line-of-sight environment.Background technique[0002]Wireless Sensor Networks (Wireless Sensor Networks, WSN) refers to a wireless communication network composed of multiple sensor devices, which are allocated to a monitored area to measure some locally interesting information. In recent years, wireless sensor networks have been widely used in the fields of target tracking, navigation, emergency services, and intelligent transportation. In these applications, the positioning of the target location is very important, and some special spaces, such as indoors and underwater, cannot be positioned with satellites such as GPS / Beidou, and wireless sensor networks are required to locate the target. In wireless sensor networks, usually, sensor nodes with known locations are deployed manually or by other means. These sensor no...

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Problems solved by technology

Slavisa Tomic and others disclosed Targetlocalization in NLOS environments using RSS and TOA measurements (Research on joint positioning based on RSS and ToA in non-line-of-sight environments) in IEEE Wireless Communications Letters (Institute of Electrical and Electronics Engineers (IEEE) Wireless Communication Letters), which Treat all links as line-of-sight (LOS), then apply an alternate optimization method, and iteratively improve position estimation and average non-line-of-sight error estimation, but this method is difficult to find a global optimal solution, resulting in target location poor precision

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