Non-cooperative positioning method for 3D wireless sensor network based on rss and aoa

Abstract

The invention discloses a three-dimensional wireless sensor network non-cooperative positioning method based on RSS and AOA, which establishes the measurement model of the RSS measurement value obtained by each anchor node, and the azimuth measurement in the AOA measurement value obtained by each anchor node and the measurement models of elevation angle measurement values; according to the respective approximate expressions of the three measurement models, combined with the least squares criterion, a non-convex positioning problem is obtained; by introducing auxiliary variables and slack variables, the equivalent of the non-convex positioning problem is obtained problem; use the second-order cone relaxation method and the positive semi-definite relaxation method to relax the constraints in the equivalent problem of the non-convex positioning problem, and get the mixed positive semi-definite / second-order cone programming problem; use the interior point method to solve the mixed positive semi-definite / Solve the second-order cone programming problem to obtain the global optimal solution of the target source, that is, the estimated position of the target source in the reference coordinate system. Less affected.

Description

technical field [0001] The invention relates to a target positioning method, in particular to a three-dimensional wireless sensor network non-cooperative positioning method based on RSS and AOA. Background technique [0002] A wireless sensor network (Wireless Sensor Network, WSN) is a distributed sensor network, which is generally composed of a large number of sensors, which are distributed in the surveillance area, cooperatively perceive, collect, process and transmit the geographical coverage of the wireless sensor network. Information about perceived objects in the area. In order to keep the implementation cost low, only some of the sensors in the wireless sensor network are equipped with Global Positioning System (GPS), which are called anchor nodes, and the rest of the Determine its location, called the target node, that is, the target source. In many practical applications, the data collected by the sensor is meaningful only if it carries the corresponding location ...

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Problems solved by technology

In the results published by Slavisa Tomic and others in IEEE Wireless Communications Letters (Institute of Electrical and Electronics Engineers (IEEE) Wireless Communication Letters), the approximate expressions of RSS and AOA models were respectively used, and then the norm was converted into the form of vector point product, and The closed-form solution expression of the localization problem is obtained by the method of weighted least squares, but experiments show that the localization performance of this non-cooperative localization method deteriorates sharply with the increase of the noise power of the mixed measurements

In the results published by Slavisa Tomic et al. in IEEE Transactions on Vehicular Technology (Institute of Electrical and Electronics Engineers (IEEE) Vehicle Technology Journal), the positioning problem was transformed into a generalized trust subdomain problem, and solved by the dichotomy method. However, the experiment showed that the There is still room for improvement in the positioning performance of non-cooperative positioning methods

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