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Hybrid TW-TOA/TDOA Positioning Algorithms for Cooperative Wireless Networks

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4 Author(s)
Mohammad Reza Gholami ; Dept. of Signals & Syst., Chalmers Univ. of Technol., Gothenburg, Sweden ; Sinan Gezici ; Erik G. Strom ; Mats Rydstrom

The problem of positioning an unknown target is studied for a cooperative wireless sensor network using hybrid two-way time-of-arrival and time-difference-of-arrival measurements. A maximum likelihood estimator (MLE) can be employed to solve the problem. Due to the non-linear nature of the cost function in the MLE, a numerical method, e.g., an iterative search algorithm with a good initial point, should be taken to accurately estimate the target. To avoid drawbacks in a numerical method, we instead linearize the measurements and obtain a new two-step estimator that has a closed-form solution in each step. Simulation results confirm that the proposed linear estimator can attain Cramer-Rao lower bound for sufficiently high SNR.

Published in:

2011 IEEE International Conference on Communications (ICC)

Date of Conference:

5-9 June 2011