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Evolution from Loran-C to eLoran. By Dr Sally Basker, Mr George Shaw, Dr Paul Williams & Prof David Last. 15 February 2010. Prepared for the European eLoran Forum. Contents. Introduction Definitions Comparison Costs. Definitions. 1960s. 1970s. 1980s. 1990s. 2000s. 2010s. eLoran`.

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evolution from loran c to eloran

Evolution from Loran-C to eLoran

By Dr Sally Basker, Mr George Shaw, Dr Paul Williams & Prof David Last

15 February 2010

Prepared for the European eLoran Forum

contents

Contents

Introduction

Definitions

Comparison

Costs

evolution timeline

1960s

1970s

1980s

1990s

2000s

2010s

eLoran`

USCGLoran-C

ModernisedLoran-C

PrototypeeLoran

Evolution Timeline

Continuous development

All dates are indicative

definitions5

USCG Loran-C

The original version of Loran-C (c. 1960s) based on tube transmitters, SAM control, ASF look-up tables and hyperbolic navigation, requiring large numbers of people on site. Typical accuracy: 460m (95%).

Modernised Loran-C

The original version of NELS (c. 1990s) based on solid-state transmitters, time-of-emission timing, ASF model, hyperbolic or rho-rho navigation, and requiring very few people on site. Typical accuracy: 100m (95%).

Prototype eLoran

The GLAs’ system (c. 2008) based on modernised Loran-C together with(i) Eurofix to carry UTC and differential Loran, (ii) all-in-view navigation,(iii) precise ASF surveys, and (iii) differential Loran reference stations for maritime use. Typical accuracy: 10-20m (95%). Real-time prototype eLoran has been in operation for two years and is now running continuously.

eLoran

This is the future (c. 2013?) based on prototype eLoran together with(i) updated station equipment to improve timing stability, (ii) mitigation of vulnerabilities to ensure high availability, (iii) Eurofix at all stations, and(iv) modernised control at Brest. Typical accuracy: 10-20m (95%).

Definitions
comparison

Comparison

Capability

Performance

Functionality

capability application supported
Capability: Application Supported

1. Full performance precise timing is not available due to the timing steps used for station synchronisation. Use of frequency steering in eLoran should enable continuous sub-50ns timing

capability application supported9
Capability: Application Supported

1. Full performance precise timing is not available due to the timing steps used for station synchronisation. Use of frequency steering in eLoran should enable continuous sub-50ns timing

functionality core system
Functionality: Core System

1. Full performance precise timing is not available due to the timing steps used for station synchronisation. Use of frequency steering in eLoran should enable continuous sub-50ns timing

functionality user equipment
Functionality: User Equipment

1. Full performance precise timing is not available due to the timing steps used for station synchronisation. Use of frequency steering in eLoran should enable continuous sub-50ns timing