• Journal of Navigation and Port Research
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• v.28 no.1
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• pp.23-29
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• 2004

This paper deals with Reed-Solomon Coding for EUROFIX system EUROFIX is an integrated navigation and communication system, which combines Differential GNSS and Loran-C EUROFIX transmits DGNSS(Differential Global Navigation Satellite Systems) (data by pulse position modulation of Loran-C pulses. Loran-C system is regarded as a satellite backup system in recent. And now, it is important to detect and correct much errors in communication systems. Error corrections or correction algorithm is actively studied nowadays because of this. In this paper, we study and design encoder and decoder of Reed Solomon Code using Finite Galois Field Fourier Transformation for error corrections in EUROFIX data transmission. Through extensive simulation, the designed Reed Solomon code is shown to be effective for error correction in EUROFIX data transmission.

• Journal of the Korean Institute of Navigation
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• v.25 no.4
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• pp.335-345
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• 2001

While recognizing that Loran-C is very important as a back-up for satellite systems, the introduction of EUROFIX, that it uses Loran-C system, was proposed and admitted at 9th FERNS(Far East Radio Navigation System) Meeting. But, the FERNS countries should consider whether the cost-effectiveness of the system could be improved by making use of its communication facilities to integrate more closely with satellite systems. And, the members were requested to give this proposal consideration before the l0th session of the Council. or this matter, Korea planned to demonstrate transmitting EUROFIX signals from Pohang Loran-C station (Master of 9930 Chain) during the l0th FERNS Meetings. Therefore, this thesis describes the analysis of EUROFIX datalink and progress of EUROFIX construction work. This thesis is the report with regard to the sequence of this demonstration of EUROFIX in Korea.

• Proceedings of the Korean Institute of Navigation and Port Research Conference
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• 2022.11a
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• pp.204-206
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• 2022

eLoran 시스템에서 보다 높은 정확도로 시각 및 위치 정보를 제공하기 위해 별도의 데이터 채널인 Loran Data Channel (LDC)를 사용한다. LDC 메시지는 기존의 8개의 Loran 펄스 중 항법에 사용하지 않는 3-8번째 펄스의 전송시각을 변조하여 송출하는 Eurofix 방식과 9번째 추가 펄스를 이용해 데이터를 변조하는 9^th 펄스 방식으로 변조될 수 있다. 본 논문에서는 eLoran 송신국에서 송출하는 LDC 메시지의 변조방법에 따른 수신 성능을 분석한다. 인천에서 운영 중인 eLoran 시험 송신국에서 9^th 펄스 변조방법과 Eurofix 변조방법으로 동시에 LDC 메시지를 송출할 수 있도록 설정하고, 인천과 평택의 eLoran 보정기준국의 데이터베이스 내 저장된 LDC 메시지를 분석해 변조방법에 따른 LDC 메시지 수신률을 분석한다. 또한 항로표지 관리선 인성 1호를 이용해 인천항 인근에서 실제 사용자의 LDC 메시지 수신률을 분석하였다. 본 연구결과는 eLoran 시범서비스 이후 본격적인 서비스 과정에서 중요하게 활용될 것으로 기대된다.

• Proceedings of the Korean Institute of Navigation and Port Research Conference
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• 2001.10a
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• pp.49-55
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• 2001

It was proposed and admitted at 9$^{th}$ FERNS Metting that FERNS countries, while recognizing that Loran-C is very important as a back-up for satellite systems, should consider whether the cost-effectiveness of the system could be improved by making use of its communication facilities to inegrate more closely with satellite system, members were requested to give this proposed consideration before the tenth session of the Council (CS 9/8/1 paragph 6.7). For this matter, Korea is planning to demonstrate treasmitting EUROFIX signals from Pohang station (Master of 9930 Chain) during FERNS meetings.

• Journal of Navigation and Port Research
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• v.46 no.6
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• pp.525-529
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• 2022

In the eLoran system, the Loran Data Channel (LDC) is used to provide precise timing and positioning. The LDC message can be modulated with the Eurofix method, which modulates the transmission time of the 3rd-8th pulse not used for navigation, and the 9th pulse method, which modulates data using the 9th additional pulse after the existing 8 Loran pulses. In this paper, we analyzed the reception performance of the LDC message transmitted from the eLoran transmitter according to the modulation method. The eLoran testbed transmitter in Incheon was set to transmit LDC messages simultaneously with the 9th pulse modulation method and the Eurofix modulation method. Then, the LDC messages stored in the databases of the eLoran differential stations in Incheon and Pyeongtaek were analyzed in terms of the message reception rate according to the modulation method. Using the navigation aid management ship Inseong No. 1, the range of LDC message reception of actual sea users near Incheon Port was also analyzed. The results of this study are expected to be utilized in the full operational capability service after the eLoran pilot service.

• Proceedings of the Korean Institute of Navigation and Port Research Conference
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• 2001.02a
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• pp.11-1-11-6
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• 2001

• Proceedings of the KSEEG Conference
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• 2001.05a
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• pp.11-113
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• 2001

No Abstract.See Full-text

• Proceedings of the Korean Institute of Navigation and Port Research Conference
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• 2000.10a
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• pp.111-116
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• 2000

No Abstract.See Full-text