Publication

Indoor Radio Positioning Using Pseudolites in the UHF Band – Signals and Ranging Precision Survey

2026

Abstract

Abstract This contribution presents a theoretical and practical analysis of the precision of deep-indoor radio positioning using sub-GHz (ultra-high frequency) band ranging pseudolites, penetrating whole buildings and blocks. Working deep indoors, pseudolite systems face a negative signal-to-noise ratio and a challenging dynamic power range. These challenges lead to small nuances and limitations compared with global navigation satellite systems. Therefore, ranging codes, modulation techniques, and corresponding time-delay/range, clock, carrier, and signal-to-noise estimators are analyzed and discussed to demonstrate the limits of deep-indoor ranging. Then, the ranging precision is evaluated based on the Cramer-Rao lower bound of ranging variance: its analytical development is followed by numerical computation and comparison with results from real measurement campaigns and a particular model of losses.

Official source

https://infoscience.epfl.ch/entities/publication/650a3604-c734-4110-91e3-4321ebb34b24

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2026

Abstract

Official source

https://infoscience.epfl.ch/entities/publication/650a3604-c734-4110-91e3-4321ebb34b24

About this result

Related concepts (32)

Positioning system

A positioning system is a system for determining the position of an object in space. One of the most well-known and commonly used positioning systems is the Global Positioning System (GPS). Positioning system technologies exist ranging from worldwide coverage with meter accuracy to workspace coverage with sub-millimeter accuracy. Interplanetary-radio communication systems not only communicate with spacecraft, but they are also used to determine their position.

Satellite navigation

A satellite navigation or satnav system is a system that uses satellites to provide autonomous geopositioning. A satellite navigation system with global coverage is termed global navigation satellite system (GNSS). , four global systems are operational: the United States' Global Positioning System (GPS), Russia's Global Navigation Satellite System (GLONASS), China's BeiDou Navigation Satellite System, and the European Union's Galileo.

Global Positioning System

The Global Positioning System (GPS), originally Navstar GPS, is a satellite-based radio navigation system owned by the United States government and operated by the United States Space Force. It is one of the global navigation satellite systems (GNSS) that provides geolocation and time information to a GPS receiver anywhere on or near the Earth where there is an unobstructed line of sight to four or more GPS satellites.

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Indoor Radio Positioning Using Pseudolites in the UHF Band – Signals and Ranging Precision Survey

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