UrsaNav® UN-156 eLORAN MONITOR RECEIVER

General Overview of the UN-156 eLoran Monitor Receiver

The UN-156 eLoran Monitor Receiver is a next-generation monitoring and measurement platform powered by the latest UrsaNav® UN-151 eLoran Receiver Module. This advanced eLoran receiver supports local and remote signal evaluation to ensure network performance, integrity, and precision timing.

Designed for critical infrastructure, defense systems, and timing networks, the UN-156 enables comprehensive monitoring of eLoran signal quality through key measurements such as Time of Arrival (TOA), Signal Strength (SS), Signal-to-Noise Ratio (SNR), and Envelope Cycle Difference (ECD). It also supports Loran Data Channel (LDC) demodulation, including Eurofix and 9th/10th pulse decoding, with full integrity checks.

With built-in UrsaNav ELEGANT™ software, users benefit from full control, flexible configuration, and remote diagnostics. The receiver is capable of self-monitoring and issuing alarms in the event of equipment faults—ensuring resilient and autonomous operation in mission-critical applications.

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UN-156 eLoran Monitor Receiver hardware for timing and signal integrity

Key Features of the UN-156

  • Advanced Signal Monitoring:
    TOA, SS, SNR, ECD, and other pulse/timing-related measurements.

  • Data Channel Decoding & Integrity Monitoring:
    Supports Eurofix, 9th and 10th pulse LDC demodulation and integrity validation.

  • Timing Output & Synchronization:
    1 PPS output, UTC Time-of-Day, and other timing signals for closed-loop control.

  • Built-In Diagnostics:
    Self-diagnosis of timing/transmission equipment and alarm generation.

  • Two-Way Time Transfer:
    Generates complete metrics to support TWLFTT operations.

  • Flexible Antenna Compatibility:
    Operates with E-field or H-field antennas and/or RF feedback from transmitter.

  • Remote Configuration & Updates:
    Field-upgradeable firmware and customizable monitoring thresholds.

  • DGNSS Reference Station Capability:
    Can be configured to serve as a Differential GNSS Reference Station.

Applications of the UN-156 eLoran Monitor Receiver

  • National timing infrastructure monitoring

  • Transmitter integrity and LDC performance assurance

  • Signal quality verification for mission-critical systems

  • eLoran timing and frequency reference validation

  • TWLFTT data collection and synchronization

  • Backup timing for critical PNT-dependent networks

Need Accurate eLoran Signal Monitoring?

Contact us today to learn how the UN-156 eLoran Monitor Receiver can strengthen your signal integrity and timing assurance strategy.