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Tham khảo tài liệu 'novel applications of the uwb technologies part 16', kỹ thuật - công nghệ, cơ khí - chế tạo máy phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | Novel Mechanisms for Location-Tracking Systems 437 a Full Centralized Fig. 8. Illustration of two different approaches for network localization. Fig. 9. Comparison of the localization accuracy achieved by different algorithms for the case of a multi-hop scenario in LOS conditions. highest accuracy. Notice moreover that in this simulation set up the target-centric approach can generally achieve a better accuracy than the centralized one. The reason is that in the target-centric approach minimizes the impact of wrong measurements and poor connectivity onto the localization error since the problem to be solved is always a single-hop type positioning. 438 Novel Applications of the UWB Technologies Fig. 10. Comparison of the localization accuracy achieved by different algorithms for the case of a multi-hop scenario in mixed LOS NLOS conditions. 4. Conclusions In this chapter we have seen the most effective optimization-based localization methods described in the literature. We distinguished them in methods for large-scale and single-hop networks. We also addressed the NLOS problem and we provided effective solutions for the single-hop scenario. In the simulation section we also described a novel approach for network localization in NLOS conditions which basically relies on a combination of a multi-hop routing with a single-hop localization method. It was observed that such a technique can provide accurate location estimates especially in the case of mixed LOS NLOS conditions. 5. References Abramowitz M. Stegun I. A. 1965 . Handbook of Mathematical Functions with Formulas Graphs and Mathematical Tables 10 edn Dover Publications. Biswas P. Liang T.-C. Toh K.-C. Wang T.-C. 2006 . Semidefinite programming based algorithms for sensor network localization with noisy distance measurements ACM Transactions on Sensor Networks 2 2 188-220. Biswas P. Liang T.-C. Toh K.-C. Wang T.-C. Ye Y. 2006 . Semidefinite programming approaches for sensor network localization with noisy .