An Improved Method for GPS-Based Network Position Location in Forests

—In this paper we present a technique for improving the location performance based on the Global Positioning System (GPS) for networks of nodes in harsh environments and demonstrate its efficacy via a combination of simulations and measurements in forests. The technique relies on the use of Ultra-wideband (UWB) signals to measure time-of-flight (TOF) and consequently the range between nodes to improve localization in harsh forest environments. Specifically, we create a system of range equations based on network connectivity and solve this system of non-linear equations using a Least-Squares Non-Linear optimization technique using any available GPS information as the initial estimate. Based on our simulations and measurements, the improved technique results in a localization accuracy in forests that is on par with clear-field reference GPS measurements.

• Type: Conference
• Year: 2008
• Where: WCNC
• Authors: Christopher L. Hutchens, Brian R. Sarbin, Alyse C. Bowers, Jason D. G. McKillican, Kyle K. Forrester, R. Michael Buehrer
• Keywords: Harsh Forest Environments, Non-Linear Optimization Technique, Reference Gps Measurements, WCNC 2008, Wireless Networks