Viceroy GPS Receiver

Superior positioning with 200+ years of on-orbit performance

General Dynamics’ Viceroy-4 Global Positioning System (GPS) Spaceborne Receiver provides position, velocity, and time information for Low Earth Orbit (LEO) and Geostationary Earth Orbit (GEO) applications. The use of dual antennas for LEO enhances the performance and satellite visibility. Each of the 12 GPS channels can be assigned to either antenna. The design supports an RS-422 interface.

  • Design based on legacy space qualified digital design
  • 20 years of trouble-free spaceflight heritage
  • Same reliable position, velocity, time, pseudorange and carrier phase at 1Hz
  • Same form-factor and interface control as heritage Viceroy receiver

Features

General Dynamics’ Viceroy™-4 Global Positioning System (GPS) Spaceborne Receiver provides position, velocity, and time information for Low Earth Orbit (LEO) and Geostationary Earth Orbit (GEO) applications. Performance and satellite visibility are enhanced through the use of dual antennas; each of the 18 GPS channels can be assigned to either antenna. The design supports RS-422 or MILSTD-1553 bus interfaces.

  • Space Qualified Digital Design
  • Full Spaceborne Capability
  • Autonomous Operation
  • Pseudorange and Integrated Carrier Phase at One Second Rate
  • One PPS Clock Output Synchronized to GPS Time
  • Radiation Hardened Static RAM
  • Up to 12 Receive Tracking Channels
  • 53 Cubic Inches
  • 2.4 Pounds
  • 20 to 35 VDC Operation
  • Improved Radiation Hardened Digital Electronics
  • 12 Channels Support All-in-View Tracking
  • Dual Antenna – Any Channel Assigned to Either Antenna (LEO only)
  • Fast Cold Start Mode Simplifies Integration and Autonomous Operation
  • Low Signal Acquisition and Tracking Supports GEO Sidelobe Tracking
  • Enhanced Resolution 1 Pulse per Second Output

Specifications

 

Viceroy-4 GPS Receiver Data Sheet

 

 

View Document

 

Receiver Architecture

12 channels with enhanced fast acquisition
Dual antenna – any channel to either antenna (LEO only)
L1: 1575.42 MHz, C/A code
Carrier-aided code tracking
Based on legacy Viceroy architecture (hardware and software)
Kalman filter or least squares solution

Input/Output

RS-422 serial I/O (standard)
X.25 protocol with ECEF position, velocity, time, longitude, latitude,
pseudorange, carrier phase
One pulse per second (GPS, UTC, or Measurement Epoch Time)
9-pin male Sub-D for prime power
37-pin female Sub-D for command and telemetry
SMA female connector for RF signal

Solution Accuracy Autonomous Position: < 15 meters, 1 sigma (LEO) | < 100 meters, 1 sigma (GEO)
Autonomous Velocity: < 0.1 meters/second, 1 sigma (LEO) | < 0.01 meters/second, 1 sigma (GEO)
1PPS time: < 100 ns, 1 sigma (typical)
Time to First Fix LEO: 4 minutes, cold start
GEO: 10 minutes, cold start
Orbital Dynamics Altitude: approx 200 km to 2000 km (LEO) | approx 35,800 km (GEO)
Velocity: up to 16,000 meters/second
Acceleration: 1G
Optional and Custom Features Single string or redundant configurations
Precision internal reference Ovenized Crystal Oscillator (OCXO)
External 10 MHz reference oscillator
Time Strobe Input: < 100 ns, 1 sigma
MEO and HEO Altitudes
Physical/Environmental Size: 6.0” x 5.2” x 1.7” (152 x 132 x 43 mm)
Weight: 2.4 lbs (1.1 kg) max
DC Power: 8 W max; steady-state tracking (20-35 V)
Vibration: 17 Grms
Shock: 1750 G @ 500 Hz
Temperature: -20°C to +60°C

 

  • Features

    Features

    General Dynamics’ Viceroy™-4 Global Positioning System (GPS) Spaceborne Receiver provides position, velocity, and time information for Low Earth Orbit (LEO) and Geostationary Earth Orbit (GEO) applications. Performance and satellite visibility are enhanced through the use of dual antennas; each of the 18 GPS channels can be assigned to either antenna. The design supports RS-422 or MILSTD-1553 bus interfaces.

    • Space Qualified Digital Design
    • Full Spaceborne Capability
    • Autonomous Operation
    • Pseudorange and Integrated Carrier Phase at One Second Rate
    • One PPS Clock Output Synchronized to GPS Time
    • Radiation Hardened Static RAM
    • Up to 12 Receive Tracking Channels
    • 53 Cubic Inches
    • 2.4 Pounds
    • 20 to 35 VDC Operation
    • Improved Radiation Hardened Digital Electronics
    • 12 Channels Support All-in-View Tracking
    • Dual Antenna – Any Channel Assigned to Either Antenna (LEO only)
    • Fast Cold Start Mode Simplifies Integration and Autonomous Operation
    • Low Signal Acquisition and Tracking Supports GEO Sidelobe Tracking
    • Enhanced Resolution 1 Pulse per Second Output
  • Specifications

    Specifications

     

    Viceroy-4 GPS Receiver Data Sheet

     

     

    View Document

     

    Receiver Architecture

    12 channels with enhanced fast acquisition
    Dual antenna – any channel to either antenna (LEO only)
    L1: 1575.42 MHz, C/A code
    Carrier-aided code tracking
    Based on legacy Viceroy architecture (hardware and software)
    Kalman filter or least squares solution

    Input/Output

    RS-422 serial I/O (standard)
    X.25 protocol with ECEF position, velocity, time, longitude, latitude,
    pseudorange, carrier phase
    One pulse per second (GPS, UTC, or Measurement Epoch Time)
    9-pin male Sub-D for prime power
    37-pin female Sub-D for command and telemetry
    SMA female connector for RF signal

    Solution Accuracy Autonomous Position: < 15 meters, 1 sigma (LEO) | < 100 meters, 1 sigma (GEO)
    Autonomous Velocity: < 0.1 meters/second, 1 sigma (LEO) | < 0.01 meters/second, 1 sigma (GEO)
    1PPS time: < 100 ns, 1 sigma (typical)
    Time to First Fix LEO: 4 minutes, cold start
    GEO: 10 minutes, cold start
    Orbital Dynamics Altitude: approx 200 km to 2000 km (LEO) | approx 35,800 km (GEO)
    Velocity: up to 16,000 meters/second
    Acceleration: 1G
    Optional and Custom Features Single string or redundant configurations
    Precision internal reference Ovenized Crystal Oscillator (OCXO)
    External 10 MHz reference oscillator
    Time Strobe Input: < 100 ns, 1 sigma
    MEO and HEO Altitudes
    Physical/Environmental Size: 6.0” x 5.2” x 1.7” (152 x 132 x 43 mm)
    Weight: 2.4 lbs (1.1 kg) max
    DC Power: 8 W max; steady-state tracking (20-35 V)
    Vibration: 17 Grms
    Shock: 1750 G @ 500 Hz
    Temperature: -20°C to +60°C

     

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