Precise Positioning Service In Space

General Dynamics' Monarch-M (formerly M-Code) Receiver provides Precise Positioning Service position, velocity, and time information for Department of Defense Low Earth Orbit (LEO) and GEO applications. Performance and satellite visibility are enhanced through the use of dual antennas; each of the 32 GPS channels can be assigned to either antenna.


  • Design Based on Legacy Monarch Space-Qualified Digital Design
  • 100+ Equivalent Years of Accumulated Trouble-Free DoD Space Heritage; > 500K Orbits
  • Same Reliable Position, Velocity, Time, Pseudorange, and Carrier Phase @ 10 Sec
  • Relative Navigation Position, Velocity, and Time Modes
  • Same Legacy Monarch Footprint and MIL-STD-1553B Interface & Control

Product Details


  • Qualified and Tested for the Space Environment: Pyrotechnic Shock, Random Vibration, Thermal-vacuum and EMI/EMC
  • Modular Design Allows for Multiple Configuration Options
  • Provides Near Real-time Position, Velocity and Time Measurements for Superior User Performance
  • Relative Navigation Capability Allows for Differential Position, Velocity and Time Determination Between Co-orbiting Spacecraft.
  • Precision Time Stamping Allows Unprecedented Accuracies in Space
  • Precise Position Service Key Management Supports All Selective Availability Anti-spoof Module (SAASM) Unique Keying
  • Single or Dual Antenna Capability Allows the Spacecraft User Installation Flexibility and Performance
  • Available In LEO, MEO or GEO Configurations
  • Integrated Anti-Jam Technology
  • 32 Channels, L1 and L2 Capable
  • C/A, P(Y) and Modernized M-Code



Monarch-M Receiver Data Sheet



View Document


Receiver Architecture 32 Channels PPS-GPS C/A, P(Y), M-Code Channels
Dual Antenna – any channel to either antenna
Frequencies & Codes: L1 & L2, C/A Code, P(Y), M-Code
Narrow Bandwidth Acceleration-Aided Carrier/Code Tracking
Tracking, and Navigation Algorithms based on Legacy Monarch
Software Reprogrammable Cryptographic Solution
Input/Output MIL-STD-1553B, Follows Legacy Monarch ICD
One Pulse per Second (GPS, UTC, or Measurement Epoch Time)
Time Strobe Input Signal
Solution Accuracy Autonomous Position: 4 meters, 1 sigma, < 1 meter typical
Autonomous Velocity: < 2 cm/sec, 1 sigma, < 0.5 cm/sec typical
Clock and 1PPS Absolute: < 10 ns 1 sigma, < 5 ns typical
Time Strobe Input: < 10 ns, 1 sigma
Relative PVT Mode: 0.5m, 0.5 cm/sec, 4 ns (1 sigma)
Cold Start Time to First Fix < 60 minutes 95% probability Cold Start, < 20 minutes typical (w keys)
< 10 minutes 95% probability Warm Start, < 5 minutes typical (w keys)
Orbital Dynamics Altitude: LEO, MEO, GEO (200 km – 45,000 km)
Velocity: up to 16,000 meters/second
Acceleration: 1G
Optional and Custom Features External Reference Oscillator or Internal Precision OCXO
GEO Side Lobe Acquisition and Tracking Software
High Dynamics Acquisition & Tracking
Physical/Environmental Radiation: 100 Krads
Single Event Upset: < 1 per year
Single Event Latchup: Immune
Reliability: 0.91 10 year, 35°C Baseplate, 100% duty cycle
Vibration: 16.6 Grms
Pyro Shock: 3000 G
Temperature: -34°C to +71°C
Size: 6.2” x 5.4” x 3.7” (158 x 138 x 94 mm)
Weight: 8 lbs (3.6 kg) max.
DC Power: 33 watts