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A Novel Satellite PRN Code Assignment Method Based on Improved RLF Algorithm.

Weiwei Wang¹, Ye Tian¹, Lang Bian¹

¹China Academy of Space Technology (Xi'an), Xi'an 710100, China.

Sensors (Basel, Switzerland)

|July 28, 2022

Summary

This summary is machine-generated.

Sharing Pseudo Random Noise (PRN) codes among Low Earth Orbit (LEO) satellites significantly reduces receiver storage and acquisition time. This novel approach optimizes Code Division Multiple Access (CDMA) for satellite navigation systems.

Keywords:

LEO-based navigation augmentation PRN code RLF algorithm average acquisition time navigation signal receiver

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Area of Science:

Satellite technology
Navigation systems
Signal processing

Background:

Low Earth Orbit (LEO) satellites offer advantages for positioning, navigation, and timing (PNT) due to stronger signals and rapid geometry changes.
Traditional Code Division Multiple Access (CDMA) in LEO constellations requires numerous Pseudo Random Noise (PRN) codes, increasing receiver resource demands and acquisition time.

Purpose of the Study:

To propose and validate a novel method where multiple LEO satellites share single PRN codes.
To determine the minimum number of PRN codes required for a LEO constellation.
To enhance the efficiency of LEO satellite-based PNT applications.

Main Methods:

Developed a mathematical model to calculate the minimum PRN code requirement for LEO constellations.
Improved the recursive largest first (RLF) algorithm for faster computation and better approximation of optimal solutions.
Analyzed polar-orbiting and Walker constellation configurations.

Main Results:

Sharing PRN codes is feasible and offers significant benefits for LEO PNT.
The minimum number of PRN codes is independent of orbital inclination but increases with orbital altitude.
The proposed method can reduce receiver storage resources and average satellite acquisition time by up to two-thirds.

Conclusions:

Sharing PRN codes among LEO satellites is a viable strategy to overcome limitations of traditional CDMA approaches.
This method substantially decreases receiver hardware requirements and improves PNT service responsiveness.
The findings support the efficient deployment and utilization of future LEO satellite constellations for PNT services.