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A pseudolite-based positioning system for legacy GNSS receivers.

Chongwon Kim¹, Hyoungmin So², Taikjin Lee³

¹School of Mechanical and Aerospace Engineering and the Institute of Advanced Aerospace Technology, Seoul National University, Daehak-dong, Kwanak-gu, Seoul 151-744, Korea. nan772@snu.ac.kr.

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Summary

This summary is machine-generated.

This study introduces a novel pseudolite positioning system for unmodified GPS receivers. It enables accurate positioning by simulating GPS signals, overcoming limitations of legacy systems.

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Area of Science:

Navigation Systems
Geomatics Engineering
Satellite Technology

Background:

Legacy GPS receivers struggle with pseudolite positioning due to incompatible data formats.
Modifying GPS receivers for pseudolites limits practical applications.
Existing pseudolite systems face challenges with unmodified hardware.

Purpose of the Study:

To develop a pseudolite-based positioning system compatible with unmodified legacy GPS receivers.
To enable pseudolite utilization for navigation without receiver modification.
To overcome data format incompatibility issues in pseudolite positioning.

Main Methods:

Pseudolites transmit simulated GPS signals using standard ephemeris data format.
Simulated signals contain data for virtual GPS satellites, not the pseudolites themselves.
A post-calculation process corrects position errors caused by signal delays.

Main Results:

The proposed system successfully processes pseudolite signals on unmodified GPS receivers.
Accurate user positioning is achieved through a post-calculation correction process.
Simulations and live data tests confirm the system's effectiveness across various geometries.

Conclusions:

The developed system allows pseudolite positioning with legacy GPS receivers without modifications.
It addresses the limitations of previous pseudolite integration methods.
The system shows potential for indoor and future outdoor GPS-pseudolite hybrid navigation.