Command & Control
Auxiliary Equipment Monitoring System
UrsaNav’s Auxiliary Equipment Monitoring System (AEMS) enables remote facility monitoring of enhanced-Loran (eLoran) transmitting or monitor sites. The AEMS can collect information from a wide variety of sensors including those for temperature, fire alarms, intrusion alarms, tower-light status, power monitoring, generator alarms, and Heating, Ventilating, and Air Conditioning (HVAC) alarms, etc.
Chain Control Monitoring Set
UrsaNav’s Chain Control Monitoring Set (CCMS), which is typically located at a control site, monitors and controls the enhanced-Loran (eLoran) transmitting sites within the service area. CCMS was constructed from the architecture and robust software that has remotely controled all 13 eLoran chains in North America, including 29 e-Loran stations and 29 monitor sites, since 1997. CCMS is based upon a durable Microsoft Windows-based client server architecture overlying an Oracle database. It employs a user-friendly Graphic User Interface (GUI) that provides exceptional control over the Integrated Control Monitoring Set (ICMS) and Timing and Frequency Equipment (TFE) at the eLoran transmitting site. The software is easily configurable and customizable to a user’s specific requirements. For example, various control algorithms are available, including fully automatic control of the system.
Integrated Control Monitoring Set
UrsaNav’s Integrated Control Monitoring Set (ICMS) manages command and control functions at an enhanced-Loran (eLoran) transmitting site. Additionally, it provides the remote interface for all commands alarms, and data to the Chain Control Monitoring Set (CCMS). This purpose-built software application was developed using a Microsoft Windows-based operating system.
Timing and Frequency Equipment
UrsaNav’s Timing and Frequency Equipment (TFE) suite provides a complete system to automatically drive any enhanced-Loran (eLoran) transmitter. TFE is compatible with older Tube Type Transmitters (TTXs), all generations of Solid-State Transmitters (SSXs), and the advanced Nautel NL series transmitters. It is also compatible with Time-of-Arrival (TOA) or Time-of-Transmission (TOT) system control environments and can be interfaced to Eurofix, Loran Data Channel or Differential eLoran reference station message broadcast systems. The TFE system uses two or three reference clocks as the source for signals. The preferred reference clock is the Symmetricom 5071A cesium reference standard. The co-location of high quality clocks enables the compulsion of a timescale, resulting in the performance of a clock ensemble that exceeds the stability of any single member. The ensemble of clocks can be steered via Global Navigation Satellite System (GNSS) to within 10 ns (RMS) of Universal Time Coordinated (UTC). A Two-Way Satellite Time Transfer (TWSTT) timing input is also available, causing even tighter alignment to UTC. There is no direct coupling between the GNSS timing system and the local reference clocks, so the TFE can maintain the station’s timing to within 30 ns (RMS) of UTC for more than three weeks after a loss of GNSS. The TFE system provides state-of-the-art timing performance with integrated health and status monitoring and a remote interface. It also consists of a single rack of equipment that includes hardware for two redundant systems.
Two-Way Satellite Time Transfer
UrsaNav can provide time synchronization solutions via Two-Way Satellite Time Transfer (TWSTT). Timing reference signals are coordinated with a master clock that can be located anywhere in the world. This solution eliminates the need for a local timing source that’s dependent on GPS for long-term synchronization.