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논문 기본 정보

자료유형
학술대회자료
저자정보
Seunghyeon Park (Yonsei University) Joon Hyo Rhee (Korea Research Institute of Standards and Science)
저널정보
제어로봇시스템학회 제어로봇시스템학회 국제학술대회 논문집 ICCAS 2024
발행연도
2024.10
수록면
187 - 192 (6page)

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초록· 키워드

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The Global Positioning System (GPS), one of the Global Navigation Satellite Systems (GNSS), provides accurate position, navigation and time (PNT) information to various applications. One of the application that is highly receiving attention is satellite vehicles, especially Low Earth Orbit (LEO) satellites. Due to their limited ways to get PNT information and low performance of their onboard clocks, GPS system time (GPST) provided by GPS is a good reference clock to synchronize. However, GPS is well-known for its vulnerability to intentional or unintentional interference. This study aims to maintain the onboard clock with less error relative to the GPST even when the GPS signal is disrupted. In this study, we analyzed two major factors that affects the quality of the GPS measurements: the number of the visible satellites and the geometry of the satellites. Then, we proposed a weighted model for a Chip-Scale Atomic Clock (CSAC) that mitigates the clock error relative to the GPST while considering the two factors. Based on this model, a stand-alone CSAC could maintain its error less than 4 μs, even in a situation where no GPS signals are received for 12 hours.

목차

Abstract
1. INTRODUCTION
2. ANALYSIS OF THE GPST OBTAINED BY A GPS RECEIVER
3. CSAC DRIFT MODELING CONSIDERING GPS SIGNAL QUALITY
4. RESULTS
5. CONCLUSION
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