Please make a donation to support Gunter's Space Page.
Thank you very much for visiting Gunter's Space Page. I hope that this site is useful and informative for you.
If you appreciate the information provided on this site, please consider supporting my work by making a simple and secure donation via PayPal. Please help to run the website and keep everything free of charge. Thank you very much.

Intruder 1, 2, 3, 4 (NOSS-2 1, 2, 3, 4)

NOSS-2 (Naval Ocean Surveillance System), which is likely not the official designation, is the second generation of NOSS satellites.

These satellites carry equipment to track ships and aircraft via their radio transmissions. Positions of the origin of the transmissions are determined by triangulation. Each launch consists of three satellites of similar size in the same orbit. All three satellites maneuver to stationkeep relative to one another.

In contrast to the earlier NOSS, the satellites are much more massive, indicated by the large Titan-4A launch vehicle. The satellites were deployed by the TLD (Titan Launch Dispenser) propulsion module, which also had a secondary communications mission.

Nation: USA
Type / Application: Ocean Surveillance, ELINT
Operator: NRO, US Navy
Contractors: Lockheed, Martin Marietta
Equipment: ?
Configuration: ?
Propulsion: ?
Power:
Lifetime:
Mass:
Orbit:
Satellite COSPAR Date LS Launch Vehicle Remarks
Intruder 1A (NOSS-2 1A, USA 60) 1990-050B 08.06.1990 CC LC-41 Titan-4(05)A with SLDCOM 1, Intruder 1B, Intruder 1C
Intruder 1B (NOSS-2 1B, USA 61) 1990-050C 08.06.1990 CC LC-41 Titan-4(05)A with SLDCOM 1, Intruder 1A, Intruder 1C
Intruder 1C (NOSS-2 1C, USA 62) 1990-050D 08.06.1990 CC LC-41 Titan-4(05)A with SLDCOM 1, Intruder 1A, Intruder 1B
Intruder 2A (NOSS-2 2A, USA 74) 1991-076C 08.11.1991 Va SLC-4E Titan-4(03)A with SLDCOM 2, Intruder 2B, Intruder 2C
Intruder 2B (NOSS-2 2B, USA 76) 1991-076D 08.11.1991 Va SLC-4E Titan-4(03)A with SLDCOM 2, Intruder 2A, Intruder 2C
Intruder 2C (NOSS-2 2C, USA 77) 1991-076E 08.11.1991 Va SLC-4E Titan-4(03)A with SLDCOM 2, Intruder 2A, Intruder 2B
Intruder 3A (NOSS-2 3A) 1993-F02 02.08.1993 Va SLC-4E F Titan-4(03)A with SLDCOM 3, Intruder 3B, Intruder 3C
Intruder 3B (NOSS-2 3B) 1993-F02 02.08.1993 Va SLC-4E F Titan-4(03)A with SLDCOM 3, Intruder 3A, Intruder 3C
Intruder 3C (NOSS-2 3C) 1993-F02 02.08.1993 Va SLC-4E F Titan-4(03)A with SLDCOM 3, Intruder 3A, Intruder 3B
Intruder 4A (NOSS-2 4A, USA 119) 1996-029A 12.05.1996 Va SLC-4E Titan-4(03)A with SLDCOM 4, Intruder 4B, Intruder 4C, TiPS 1a, TiPS 1b
Intruder 4B (NOSS-2 4B, USA 120) 1996-029B 12.05.1996 Va SLC-4E Titan-4(03)A with SLDCOM 4, Intruder 4A, Intruder 4C, TiPS 1a, TiPS 1b
Intruder 4C (NOSS-2 4C, USA 121) 1996-029C 12.05.1996 Va SLC-4E Titan-4(03)A with SLDCOM 4, Intruder 4A, Intruder 4B, TiPS 1a, TiPS 1b