A study of Q-range ambiguity in the Radio Interferometric Positioning System

Abstract

The Radio Interferometric Positioning System (RIPS) was developed by Maroti et al. for the purpose of node localization in wireless sensor networks. They theorized that RIPS would produce ambiguous measurements when distances between nodes exceeded a carrier wavelength. This paper investigates this effect. In this investigation patterns in these invalid measurements are studied and then explained by looking at the mathematics behind RIPS. Findings made, provide a characterization of ambiguity in RIPS as well as new methods to extend the range of RIPS measurements beyond one carrier wavelength.