Resurs-O1 N1, 2 (11F697)

Resurs-O1 N2 [VNIIEM]

Resurs-O1 N1 (Kosmos 1689) and Resurs-O1 N2 (Kosmos 1939) were the first operational observation satellites in the Russian Resurs-O1 program. They were the successors to the Resurs-OE and Meteor-Priroda prototypes.

The Resurs-O1 N1 and N2 satellites were based on the Meteor-2 satellite bus and carried following instruments:

• MSU-E High-Resolution Multispectral Scanner (2 units):
  MSU-E is a pushbroom CCD device operating in the spectral ranges of 0.5 - 0.6 µm, 0.6 - 0.7 µm, 0.8 - 0.9 µm. Each instrument has a spatial resolution 45 m × 33 m and a swath width of 45 km for one device or 80 km for both. The observation direction of the instrument can be set by ground commands in steps of 2º.
• MSU-SK Multispectral Scanner - Conical Scanning:
  MSU-SK is a moderate resolution radiometer with a look angle of 39º. This gives the sensor the advantage that although it is a wide-field sensor, it produces constant resolution and viewing angle for all pixels, resulting in increased radiometric accuracy. It operates in five spectral bands: 0.5 - 0.6, 0.6 - 0.7, 0.7 - 0.8, 0.8 - 1.1, and 10.4 - 12.6 µm. Spatial resolution = 170 m (in VIS) and 600 m (TIR). Swath width is 600 km.
• MSU-S Multispectral Scanner (only on Resurs-O1 N1):
  MSU-S is a moderate resolution radiometer with two spectral bands in the range 0.58 - 1.0 µm with a resolution of 240 m on a swath of 1380 km

Kosmos 1689 (Resurs-O1 N1) remained operational for 3 years until 1988 and Kosmos 1939 (Resurs-O1 N2) operated for 7 years until 1995.