NavFire Carrier (NFC)

Invocon’s NavFire Carrier (NFC) hosts a BAE Systems NavFire™ GPS Receiver (GPSR), enhancing its interface with nominal +28 Vdc MIL-STD power and RS-422 signal conversion. NavFire™ signals are made available on configurable connectors suited for direct connection to a flight computer or simultaneous connection to an Emcore SDN500 INS and flight computer. The NFC replicates the GPS 1PPS signal to five RS-422 outputs and one 3.3V CMOS output, and provides a key-loading interface via DB-9 connector.

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Key Specifications

Specification
Value
Input Voltage
9 – 60 Vdc (EMI Filtered)
Input Current
Typical 140 mA continuous at 28 Vdc
Power Connector
PT02E-8-4P circular
I/O Connector
DB-50
Key-Loading Connector
DB-9
Size
6.25" x 4.25" x 1.961" (including GPS RF connector holddown bracket)
Weight
Nominal 2.3 lbs
Case Material
7075 aluminum, Alodine coated
Operating Temperature
-24° to +61°C (Acceptance Levels)
1PPS Outputs
5x RS-422 + 1x 3.3V CMOS
GPS RF
L1/L2 RF connectors exposed with holddown bracket

Key Features

  • MIL-STD Power Interface

    Accepts 9–60 Vdc input with internal EMI filtering and conversion to +5 Vdc for the hosted GPSR, eliminating the need for external power conditioning.

  • RS-422 Signal Conversion

    Converts NavFire™ 3.3V CMOS outputs to RS-422 for direct interfacing to flight computers and other standard avionics buses.

  • 1PPS Fan-Out

    Distributes the GPSR’s 1PPS synchronization signal to five RS-422 outputs and one CMOS output simultaneously for multi-system timing distribution.

  • SDN500 INS Tightly Coupled Interface

    Enables tightly coupled GPS/INS integration with the Emcore (Systron-Donner) SDN500-xx76 IMU, combining GPSR and IMU data into a blended INS solution.

  • Key Loading Interface

    Provides a DB-9 encryption key loading port to support classified GNSS operation.

  • Optional Auxiliary Power and Timing Signals

    Battery backup input, 10.949 MHz time synchronization, 50 Hz T20 clock, and spin pulse output are all available as optional interfaces.

Typical Applications

  • Launch Vehicle GPS/INS Navigation

    Interfaces a NavFire™ GPSR to a flight computer for GPS-based navigation during ascent.

  • Tightly Coupled GPS/INS Integration

    Pairs with an SDN500 IMU for blended inertial/GPS navigation on spinning or high-dynamic vehicles.

  • Multi-System 1PPS Distribution

    Distributes GPS timing to multiple avionics subsystems requiring synchronized time references.

  • Classified GNSS Operations

    Supports encryption key loading for M-code or anti-jam GPS operation on government missions.

Available Configurations

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