Localization in Wireless Sensor Networks

Localization is often complicated by the difficulty of obtaining enough accurate pair-wise range measurements between sensors. Inter-sensor ranges can be corrupted by noise or lost entirely due to occluded line-of-sight. Thus, consistently accurate localization requires robustness in the face of missing or low quality measurements. Nevertheless, localization is rarely the purpose of a network. Also, there is pressure in localization research to achieve accuracy and robustness using as little hardware as possible.