Uragan-M (GLONASS-M, 11F654M)

• GLONASS (Globalnaya Navigationnaya Sputnikovaya Sistema, Global Orbiting Navigation Satellite System) is a Russian space-based navigation system comparable to the American GPS system, which consists of Uragan spacecraft. The operational system contains 21 satellites in 3 orbital planes, with 3 on-orbit spares. GLONASS provides 100 meters accuracy with its C/A (deliberately degraded) signals and 10-20 meter accuracy with its P (military) signals.
• Uragan-M spacecraft are the second generation of GLONASS satellites with an increased lifetime of 7 years, following up the first generation Uragan spacecraft.
• The Uragan-M spacecraft are 3-Axis stabilized, nadir pointing with dual solar arrays.
• A Glonass-M spacecraft consists of a cylindrical pressurized container with an equipment bay, a frame of antenna-feeder devices, attitude system instruments, solar array panels with drivers, a propulsion unit, and thermal control system shutters with drivers.
• Each Glonass-M satellite also hosts optical angular deflectors to calibrate measurement system signals by measuring optical satellite distance and specify geodynamic trajectory parameters. An angular deflector is designed as a unit continuously tracking direction to the Earth’s center.
• The payload consists of L-Band navigation signals in 25 channels separated by 0.5625 MHz intervals in 2 frequency bands: 1602.5625 - 1615.5 MHz and 1240 - 1260 MHz. EIRP 25 to 27 dBW. Right hand circular polarized. On-board cesium clocks provide time accuracy to 1000 nanoseconds. A civil reference signal on L2 frequency is to be added after the completion of flight testing of Glonass-M in 2004 to substantially increase the accuracy of navigation relaying on civil signals.
• Glonass spacecraft perform a number of functions:
  • transmit stable radio navigation signals;
  • receive, store and transmit digital navigation data;
  • generate, digitalize and transmit time signals;
  • relay or transmit trajectory measurement signals for orbit control and time scale correction;
  • receive and process commands;
  • receive, store and implement in-orbit operation control programs;
  • generate onboard equipment telemetry data and transmit it to the ground control complex for processing and analysis;
  • receive and follow commands of onboard time scale correction and phasing;
  • report malfunctions.
• The spacecraft will be launched in triplets using Proton-K/DM-2 or Proton-K/Briz-M boosters. At least one single launch using an indian GSLV is also planned. The Uragan-M satellites will be replaced by Uragan-K models.

Type, Application: Navigation Contractor: NPO Prikladnoi Mekhaniki (NPO-PM) Configuratation: 3-Axis stabilized, 2 solar arrays Lifetime: 7 years Launch mass: 1415 kg Orbit: 19100 x 19100 km, 64.8°

Uragan-M

12 Sep 2008: Assembling of three spacecraft "Glonass-M" is completed

Launch list: