Monarch GPS Receiver

This product has been discontinued


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General Dynamics’ Monarch Precise Positioning Service, Global Positioning Service (PPS-GPS) receiver is designed to meet demanding requirements for any Earth-orbital missions in sight of the GPS constellation. Our use of advanced digital signal processing technology has set a new standard for spaceborne receiver pseudo-range and carrier phase performance, while affording significant improvements in reliability, radiation hardness and power dissipation. A modular approach to the mechanical design, combined with software/firmware flexibility, allows easy customization for user-specific applications.

General Dynamics' Monarch Receiver provides precise positioning service position, velocity and time information for Department of Defense low Earth orbit (LEO) and geo-synchronous Earth orbit (GEO) applications. The Monarch includes SAASM (anti-spoof) security features.

  • Qualified and tested for the space environment: pyrotechnic shock, random vibration, thermal-vacuum, EMI/EMC, natural radiation, and SEU/SEL
  • 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 coorbiting spacecraft.
  • Precision time stamping allows unprecedented accuracies in space
  • Pps 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
  • Uses the radiation hardened Key Data Processor (KDP)
  • Available In LEO, MEO or GEO configurations
  • Granted the navstar Global Positioning System (GPS) Joint Program Office (JPO) SAASM security approval



Monarch GPS Receiver Data Sheet



View Document


Type of Service Precise Position Service (PPS)
Number of Simultaneous Antennas 1 or 2
Frequencies L1 & L2
Signal Power L1 C/A -135 dBm min.
L1 P(Y) -138 dBm min.
L2 P(Y) -138 dBm min.
Number of Channels 12
Reference Oscillator* Internal OCXO (user supplied optional)
Interface* MIL-STD-1553B or NASA STD
RIU (optional 100 record history buffer)
Pseudo-range 25 cm (1σ); 15 cm typical
Pseudo-range Bias < 5 cm (1σ); 3 cm typical
Carrier Phase 0.35 cm (1 sigma/1 sec); 0.15 cm typical
Battery 1794AS0953A/U
Carrier Phase Integrity 0.001 (prob of disruption/hr)
Navigation** (10 sec update) Absolute Position: 8.5 m (1σ); 3 m typical
Absolute Velocity: 2 cm/s (1σ); 0.7 cm/sec typical
Clock Offset Solution Error: 20 ns (1σ); < 5 ns typical
Relative Position: 0.5 m (1σ); 0.25 m typical
Relative Velocity: 0.005 m/s (1σ)
Relative Clock Offset: 4 ns (1σ)
Time Tag Measurements Coarse Time Transfer TTL In/Out: 100 ns (1σ)
Precision Time Transfer ECL In/Out: 20 ns (1σ); 5 ns typical
Relative Time Transfer: 4 ns (1σ)
Startup Time Cold: 35 minutes (Pf > 90%, typ 15 minutes w/key data)
Warm: 25 minutes (Pf > 90%, typ 3 minutes w/key data)
Physical Characteristics Envelope Dimensions: 8.06”L x 7.85”W x 5.52”H
Weight: 8.2 pounds nominal
Power: 25 W max; 19 W steady state typ
Environmental Capabilities Radiation: 100 krads
Single Event Upset: < 1 per year
Single Event Latchup: Immune
Reliability: 0.91 @10 years, 35°C baseplate, 100% duty cycle
Random Vibration: 16.6 Grms
Pyro Shock: 3000 G
Temperature: -34 to +71°C
Orbital Dynamics: LEO, MEO, GEO***


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