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Despite of the ultra-wideband (UWB) system's robustness against multipath in cluttered environments, a number of challenges remain before UWB localization can be implemented. In particular, non-line-of-sight (NLOS) propagation is especially critical for high-resolution localization systems because non-negligibly positive biases will be introduced in distance measurements, thus degrading the localization...
This paper considers the problem of range-based decentralized localization in wireless sensor networks when the impulsive measurement noise is present. We develop a robust localization estimator requiring no a priori knowledge of the noise distribution. The approach to robust localization presented here follows the concept of M-estimation and is implemented in a decentralized manner thus suiting the...
Node flip ambiguity is a key problem that needs to be addressed for the range-based node localization in wireless sensor networks. A Robust Node Localization Method (RNLM) is proposed in this paper. It is a two phase methods. In the first phase, the orthogonal projection detection method is adopted to detect the unknown nodes needed to be positioned. For the unknown nodes that will not occur flip...
Node flip ambiguity is a key problem that needs to be addressed for range-based node localization in wireless sensor networks. In this paper we have implemented robustness analysis for three-dimensional node localization in wireless sensor networks. A robustness criterion to detect flip ambiguity for range-based three-dimensional nodes localization is proposed. We have proposed that flip ambiguity...
In this paper, we introduce a novel direction of arrival (DOA) estimation algorithm for an array presenting multiple scales of invariance, based on a CANDECOMP/PARAFAC (CP) model of the data. The proposed approach is a generalization of the results given in [1] to an array presenting an arbitrary number of spatial invariances. We show, on a particular array geometry, that our method could out-perform...
Prediction of radio coverage, also known as radio ldquohear-abilityrdquo requires the prediction of radio propagation loss. The Irregular Terrain Model (ITM) predicts the median attenuation of a radio signal as a function of distance and the variability of the signal in time and in space. Algorithm can be applied to a large amount of engineering problems to make area predictions for applications such...
Service-oriented information technology is a new emerging paradigm. It can drive the development with rapid, low-cost and easy composition of distributed applications in software product. However, it has several problems such as how to identify service and determine service granularity. This paper proposes a solution that identifies service by using ontology in product line. We analyze service identification...
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