Systems

UrsaNav^™ is the only commercial entity in the world that has successfully designed, developed, installed, certified, and deployed operational Loran-C and eLoran systems. We have considerable expertise and experience with all facets of Loran and eLoran system design, including developing operational requirements and equipment specifications, estimating (and then guaranteeing) coverage areas and PNT performance, and managing all aspects of the civil, mechanical, and electrical engineering required to implement a successful national or international service.

Our staff has assisted with the design, development, support, operations, maintenance, and/or upgrade of Loran-C systems around the world, including in North America, Europe, Asia, North Africa, and the Middle East. We have directly designed, or assisted with the design of, every eLoran site or system currently operating in the world. We focus on understanding our clients’ coverage area requirements and analyzing the system scale to determine ideal locations for key components.

To maintain its leadership position, UrsaNav™ in recent years has:

developed new eLoran transmitter technology,
delivered operational eLoran transmitters in the USA, Republic of Korea, and the Kingdom of Saudi Arabia,
updated timing and control technology using next generation signal processing and software defined system technologies,
developed and delivered eLoran and multi-mode (i.e., eLoran, GPS, DGPS, R-Mode, IRIG-B) receivers to customers throughout the world,
developed and delivered eLoran Differential Loran Reference Station technology to the United Kingdom, Republic of Korea, and the Kingdom of Saudi Arabia, proving the capability of eLoran to provide better than 10-meter accuracy for maritime applications,
patented Private eLoran Service (PeLS) under the patent entitled “SYSTEM AND METHODS FOR A PRIVATE ELORAN SERVICE”, and
worked with various partners to integrate our eLoran receiver technology into their products.

United Kingdom (UK)

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The General Lighthouse Authorities of the United Kingdom and Ireland (GLAs) installed an UrsaNav™ transmitter at Rugby Radio Station in ~2006.
UrsaNav™ relocated the transmitter to its present location at Anthorn under a contract from Babcock.
The transmitter was integrated into the Northwest European Loran System (NELS) and the GLAs demonstrated 10m Harbor Entrance and Approach accuracy using UrsaNav™ supplied Differential eLoran Reference Stations and Resilient PNT User equipment.
After the NELS termination, the Anthorn transmitter has been in continuous operation for precise timing and for a private data channel by a UK Government agency (“3^rd Party Data Channel”).
UrsaNav™ is the eLoran technology support contractor to Babcock, and supplied costed options to further upgrade the station as part of a long-term investment in eLoran by the UK.
Provided PCB-based eLoran receivers, and associated antennas, used in the UK GAARDIAN and SENTINEL projects
Provided eLoran receivers and antennas used in support of NAVISP-El1-011 PNT Resilient, Trustworthy, Ubiquitous Time Transfer project.

United States of America (USA)

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Three former Loran-C stations in the northwest part of the Continental US have been continuously operated and maintained by UrsaNav™ since 2021 under license from the Department of Homeland Security.
The three stations are George, WA; Havre, MT; and Fallon, NV. At the Fallon station, an UrsaNav™ transmitter is installed as shown below (open and closed) in a military-certified air transportable shelter. When paired with the 190m mast at Fallon, the radiated power is more than 200kW.
The system operation supports ongoing R&D activities by the US Government.

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We recently completed the design, development, installation, and operational certification of a High-Power RF transmitting station site project. Although not an eLoran transmission site, this project represents our recent ability to deliver containerized solutions. In this case, the containers include a complete dual HF transmitter and antenna solution, with all the command, control, timing, and secure communications equipment; whole-site UPS; HVAC and Liquid Cooling Systems; backup generator with Automatic Transfer capability; fire detection and suppression; and sophisticated internal and external security systems.
Our system design expertise also extends to simulation and testing to provide highly precise coverage-area projections during the early stages of system planning. Whether it is a completely new system, upgrade, modernization, in-fill of a new site, or relocation, we provide turnkey or consulting solutions that meet customer expectations while minimizing system/service unavailability.

Kingdom of Saudi Arabia (KSA)

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• The KSA Loran-C system was built on UrsaNav™ technology in the mid to late 1980s.

• UrsaNav™ has, over the years, supported various technology refresh programs.

• In April 2023, UrsaNav™ received a significant contract to upgrade the KSA system from Loran-C to eLoran. This involved designing a new timing and control system to function with the existing 35-year-old very high-power transmitters. It also included building and fielding differential reference stations for high accuracy in port regions. UrsaNav™ also delivered an Additional Secondary Factor (ASF) Measurement Unit and User Equipment.

• Equipment was factory accepted in April 2024, installed and calibrated this past summer, and with system acceptance received in October 2024.

Republic of Korea (ROK)

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UrsaNav™ has provided equipment and service to the ROK for over 30 years. Two transmitters were installed at the location of former US DOD Loran-C stations in the 1990s.
UrsaNav™ supplied an eLoran test bed transmitter in 2019 for deployment at Incheon that was subsequently relocated to a more permanent site on Socheong-Do, an island close to the border with North Korea.
UrsaNav™ continues to provide User Equipment.
We are presently under contract since June 2024 with an in-country partner to transfer the production and technology of eLoran User Equipment for the domestic market to ROK. This next-generation design will reduce the size, weight, power, and cost of the present receiver technology.