• 제어로봇시스템학회:학술대회논문집
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• 2003.10a
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• pp.2636-2640
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• 2003

KARI had developed an Local Area Augmentation System for aircraft precision landing as following ICAO SARPs(Standards and Recommended Practices) draft and FAA's recommended algorithm( carrier smoothing techniques). JPO in charge of managing GPS has introduced the signal structure of GPS modernization program. This paper estimates the accuracy performance of KARI-LAAS with modernized GPS signal but the same processing algorithm.

• Journal of Electrical Engineering and Technology
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• v.6 no.5
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• pp.723-730
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• 2011

The GPS modernization program offered a new civil signal on the L2 band, and the first modernized GPS Block IIR satellite was launched in September 2005. Currently, eight GPS Block IIRM satellites and two Block IIF satellites transmit L2C signal. The L2C signal contains two codes of CM and CL that are much longer than the L1 C/A code. Thus, the acquisition of the CM and CL codes takes more time compared with that of L1 C/A code. Under the assumption that the L2C signal is strong enough for detection, this paper suggests rapid acquisition methods for the GPS L2C signals for software receivers and compares its performance with that of other methods.

• Proceedings of the KIEE Conference
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• 2011.07a
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• pp.1754-1755
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• 2011

GPS modernization program offers a new civil signal on L2 band and there are currently 9 GPS satellites transmitting L2C signal. The acquisition of L2C takes much time comparing with that of L1 signal. This paper suggests a fast acquisition method for the L2C GPS signals for software receivers.

• Proceedings of the Korean Institute of Navigation and Port Research Conference
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• v.2
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• pp.27-31
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• 2006

With the fast developing pace, the Galileo system is entering the navigation stage with high profile. At the same time, U.S. is accelerating his GPS modernization schedule, and Russian also begins to resuscitate their GLONASS. Moreover, Chinese Beidou system has also joined the satellite navigation family with low profile already. And of course Japanese QZSS even moves forward. Along with the bitter competition in technology, finance, market and even military affairs, all these systems will firmly benefit each other and massively extend the role of civil satellite navigation industry in the future. The Global Navigation Satellite Systems (GNSS) would be almost certain to include above major satellite navigation systems. Thus how to utilize the navigation satellite resource for world peace and promote the progress of mankind should be the key issue of this century.

• Proceedings of the KAIS Fall Conference
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• 2011.12b
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• pp.533-536
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• 2011

GPS 현대화 계획은 모든 사용자에 대해 정확도와 사용성을 향상하는 것을 목표로 하여, 미국의 주도하에 오랜 기간에 걸쳐 계획되고 진행되고 있다. 본 논문은 미국의 GPS 현대화 관련 현황 및 계획과, 위성항법 관련 유럽 및 아시아 국가들의 동향에 대하여 기술하였으며, 관련 국내 관련 연구개발동향 및 국내 관련 기술 연구개발에 대한 필요성을 제기하고자 하였다.

• Journal of the Korean Society for Aviation and Aeronautics
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• v.17 no.4
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• pp.17-24
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• 2009

According to the GPS modernization, L5 is the third civilian GPS signal, broadcasts in a radio band reserved exclusively for aviation safety services. However, as the code length of GPS L5 is ten times longer than that of GPS L1, the acquisition processing time in GPS L5 takes longer than that of L1. This characteristics make the code phase detected initially change and cause the tracking loop to unlock. In order to overcome this problem, this paper proposes L5 acquisition schemes for the rapid code phase re-search and the fine doppler determination. The feasibility of the proposed scheme is demonstrated through the simulation results.

• Journal of the Korean Society of Marine Environment & Safety
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• v.21 no.3
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• pp.234-239
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• 2015

This paper focuses on analyzing the modern warfare and weapon systems supported by improved GPS informations. The GPS capability was investigated through the real experimental test for verifying the most recent GPS features under its modernization processing. And then it was verified that such capabilities, accuracy and availability, of a typical L1, C/A code GPS receiver are equivalent to the military receiver's ones. It was also sure that the influence of GPS improved informations on NCW(Network-Centric Warfare), PGM(Precision Guided Munition) and C4SIR(Command, Control, Communications, Computers, Intelligence, Surveillance and Reconnaissance) should be increased and the modern warfare may be strongly dependent on GNSS informations.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• 2014.10a
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• pp.840-841
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• 2014

전세계 위성항법시스템은 미국의 GPS, 러시아의 GLONASS가 운용되고 있으며, Galileo, COMPASS 등이 구축 중에 있다. 세계적인 시스템으로 발전한 GPS와는 대조적으로 GLONASS는 세계 위성항법 사용자는 물론 자국 내의 사용자에게까지도 외면 당해왔다. 이는 구소련의 붕괴이후 러시아의 재정문제로 GLONASS가 완전한 임무수행을 못했기 때문이다. 따라서 본 논문에서는 러시아 GLONASS 시스템의 현대화 정책을 분석하고, 위성으로부터 수신되는 실측데이터를 통해 시스템의 운용정도를 분석한 결과 정상작동 중이며 GPS와 GLONASS 통합 데이터가 매우 우수함을 확인하였다.

• Journal of Positioning, Navigation, and Timing
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• v.13 no.1
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• pp.45-52
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• 2024

As part of the Global Positioning System (GPS) modernization program in the United States, Civil Navigation (CNAV) and CNAV-2 messages were developed to introduce flexibility and modern features to the Legacy Navigation (LNAV) message. This paper explores the additional parameters introduced in CNAV/CNAV-2 compared to LNAV, focusing on their roles from the user's perspective. This paper compares the structural and parameter differences among LNAV, CNAV, and CNAV-2. Additionally, we analyze the types and roles of parameters newly incorporated into CNAV/CNAV-2 that were absent in LNAV.

• Proceedings of the Korean Institute of Navigation and Port Research Conference
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• v.2
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• pp.3-8
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• 2006

The next decade promises drastic improvements and additions to global navigation satellite systems (GNSS). Plans for GPS modernization include a civilian code measurement on the L2 frequency and a new L5 signal at 1176.45 MHz. Current speculations indicate that a fully operational constellation with these improvements could be available by 2013. Simultaneously, the Galileo Joint Undertaking is in the development and validation stages of introducing a parallel GNSS called Galileo. Galileo will also transmit freely available satellite navigation signals on three frequencies and is scheduled to be fully operational as early as 2008. In other words, a dual system receiver (e.g., GPS+GALILEO) for general users can access six civil frequencies transmitted by at least fifty eights navigation satellites in space. The advent of GALILEO and the modernization of GPS raise a lot of attention to the study of the compatibility and interoperability of the two systems. A number of performance analyses have been conducted in a global scale with respect to availability, reliability, accuracy and integrity in different simulated scenarios (such as open sky and urban canyons) for the two systems individually and when integrated. Therefore, the scope of this article aims at providing the technical benefits analysis for Taiwan specifically in terms of the performance indices mentioned above in a local scale, especially in typical urban canyon scenarios. The conclusions gained by this study will be applied by the Land Survey Bureau of Taiwanese as the guideline for developing future GNSS tracking facilities and dual GNSS processing module for precise surveying applications in static and kinematic modes.