Welcome to our location discovery website. This site contains the details of our AHLoS project and a wide collection of information related to location discovery. AHLoS is an ongoing project so these pages are subject to constant update. Please check back frequently for updates.
AHLoS represents our current research effort in the development of a fine-grained location discovery system in ad-hoc networks. The main goal of this project is to provide mechanisms and technologies that enable location awareness in wireless nodes. Our primary focus is to provide location awareness in networks of wireless micro sensors both in indoor and outdoor environments without requiring the use of GPS on each sensor node.
The solution approaches we are considering make use of location information available at a small fraction of the nodes and inter-node separations to infer node physical locations. For this we are developing centralized and distributed algorithms for inferring node locations. To perform the required inter-node separation measurements we are currently considering: 1) Received Radio Signal Strength for proximity sensing and 2) A combination of RF and ultrasound transmissions for fine-grained localization.
Shortcut to Medusa MK-2 Schematics and Manufacturing Information
Our new node for localization Medusa MK-2:
Our indoor experimental testbed consists of 10 Medusa nodes and a Pentium II PC. The PC acts as a based station that collects distance measurements and location information from the sensor nodes and provides estimates of the node location. The estimated node locations are also displayed on a frequently updated graphical user interface.
This prototype has demonstrated very promising results! All estimated node locations fall within the surface area of our prototype board (3 x 4 inches). Here are some snapshots from the GUI
