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