Accuracy Analysis in Sensor Networks for Asynchronous Positioning Methods

• DOI: 10.3390/s19133024
• Publication Date: 2019-07-10T07:05:26Z
• Authors: Rubén Álvarez; Javier Díez-González; Efrén Alonso; Laura Fernández-R...; Manuel Castejón-L...; Hilde Perez
• Keywords: Cramér–Rao bound; Dilution of precision; Position (finance)

The accuracy requirements for sensor network positioning have grown over the last few years due to high precision demanded in activities related with vehicles and robots. Such systems involve a wide range of specifications which must be met through devices based on time measurement. These been traditionally designed synchronization their sensors order compute position estimation. However, this introduces an error determination can avoided centralization measurements single clock coordinate sensor. This found typical architectures such as Asynchronous Time Difference Arrival (A-TDOA) Difference-Time (D-TDOA) systems. In paper, study suitability these new Cramér-Rao Lower Bound (CRLB) evaluation was performed first under different 3D real environments multiple locations. analysis carried out heteroscedastic noise variance modelling distance-dependent Log-normal path loss propagation model. Results showed that A-TDOA provided less uncertainty root mean square (RMSE) positioning, while D-TDOA reduced standard deviation increased stability all domain.