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Onyx 1, 2, 3, 4, 5 (Lacrosse 1, 2, 3, 4, 5)

Onyx under construction [NRO]

The Onyx satellites are terrestrial radar imaging reconnaissance satellite operated by the National Reconnaissance Office (NRO).

Martin Marietta (later Lockheed Martin) was the main contractor of these satellites. Onyx uses synthetic aperture radar (SAR) to perform mapping. Resolution is probably around 1 meter.

A space-based radar can penetrate clouds, and utilization of synthetic aperture radar (SAR) techniques can potentially provide images with a resolution that approaches that of photographic reconnaissance satellites. A project to develop a SAR satellite was initiated in late 1976 under project Indigo and later Lacrosse (the spelling Lacros was also used). Development of the Lacrosse system was approved in 1983. Before the first launch the program was renamed to Onyx. These satellites were launched under the designation Program 3100.

According to observers, the distinguishing features of the design of the Onyx satellite include a very large radar antenna, and solar panels to provide electrical power for the radar transmitter. Reportedly, the solar arrays have a wingspan of almost 45 meters, which suggests that the power available to the radar could be in the range of 10 to 20 kilowatts, as much as ten times greater than that of any previously flown space-based radar.

Onyx satellites are deployed in two different orbital inclinations, 57 and 68 of around 650 km height, but the satellites occasionally manoeuvre to different heights.

Based on leaked information, it appears, that there are two blocks with Onyx 1, 2 and 3 being Block 1 and the final two being Block 2.

Onyx 1 was deorbited in 1997 and Onyx 2 on March 26, 2011.

The Onyx program ended after the 5th satellite. The follow-on program is Topaz (FIA-Radar).

Nation: USA
Type / Application: Reconnaissance, Radar (Data transmission type)
Operator: NRO
Contractors: Martin Marietta → Lockheed Martin
Equipment: SAR
Configuration: SA-Radar
Propulsion: ?
Power: 2 deployable solar arrays, batteries
Lifetime: 9 years ?
Mass: 14500 kg - 16000 kg ?
Orbit: 437 km × 447 km, 57.0 (#1); 420 km × 662 km, 68.0 (#2); 666 km × 679 km, 57.0 (#3); 689 km × 695 km, 68.0 (#4); 718 km × 712 km, 57.0 (#5)
Satellite COSPAR Date LS Launch Vehicle Remarks
Onyx 1 (3101, USA 34) (ex Lacrosse 1) 1988-106B 02.12.1988 CCK LC-39B Shuttle with Atlantis F3 (STS 27R)
Onyx 2 (3102, USA 69) (ex Lacrosse 2) 1991-017A 08.03.1991 Va SLC-4E Titan-4(03)A
Onyx 3 (3103, USA 133, NROL 3) (ex Lacrosse 3) 1997-064A 24.10.1997 Va SLC-4E Titan-4(03)A
Onyx 4 (3104, USA 152, NROL 11) (ex Lacrosse 4) 2000-047A 17.08.2000 Va SLC-4E Titan-4(03)B
Onyx 5 (3105, USA 182, NROL 16) (ex Lacrosse 5) 2005-016A 30.04.2005 CC SLC-40 Titan-4(05)B

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