EUROFIX Regional Area Augmentation System: Reducing spatial decorrelation with Extended DGPS

Eurofix is an integrated navigation system, which combines Differential GNSS and Loran-C. The Loran-C system is used to transmit messages which contain differential corrections for GNSS by additional modulation of the transmitted signals. It has been shown that reliable data transmission with Loran-C stations up to 1,000 km distance is feasible....

Eurofix : Ternary modulation and error control coding

The Eurofix navigation system is intended to overcome the problems of the GPS satellite navigation system by broadcasting corrections for this system using existing LORAN-C transmitters. By modulating the pulses transmitted by the LORAN-C stations, a low speed digital communication channel becomes available. This datalink must fulfill a number...

Design and Testing of an Advanced Eurofix Demodulator

In the Eurofix system, DGPS corrections are transmitted using an already existing infrastructure: the Loran-C system. Primarily, this provides a cost-effective way to supply coverage for DGPS-corrections over a large area. Secondly, the use of the Loran-C navigation system in combination with normal GPS will yield a combined system with improved...

Modulation Schemes for the Eurofix Datalink

In the Eurofix system DGPS corrections are transmitted using the Loran-C signal as a datalink by time shifting the Loran-C pulses. The performance of the datalink, however, is bounded by restrictions of both the Loran-C system and the DGPS system. First, the normal Loran-C performance should not degrade noticeably due to the extra data...

Korte-termijn stabiliteit van Loran-C skywaves

Within the Telecommunications- and Trafficcontrolsystems group the interest in the Loran-C navigation system has increased since the start of the Eurofix-project. This Eurofix-concept uses the Loran-C signals to send Differential GPS-messages to the user. One of the problems of the Loran-C system is the occurrance of skywaves. Skywaves are...

Analysis of the Eurofix Data Link

After the introduction of the Eurofix concept for transmission of Differential GPS data via Loran-C signals by additional phase modulation, the consequences of this modulation for conventional (non-Eurofix) users is discussed. In what follows, various modulation schemes will be introduced and the properties of these schemes will be described.