Resurs-O1 N4 (11F697)

Resurs-O1 2 (N4) [VNIIEM]

Resurs-O1 N4 or Resurs-O1 2 is the fourth earth observation satellite in the Russian Resurs-O1 program.

The Resurs-O1 N4 was based on the Meteor-3 satellite bus and carried following instruments:

• MSU-E1 High-Resolution Multispectral Scanner (2 units):
  MSU-E1 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 60 km for one device or 105 km for both. The observation direction of the instrument can be set by ground commands in steps of 2º.
• MSU-SK1 Multispectral Scanner - Conical Scanning (2 units):
  MSU-SK1 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 six spectral bands: 0.5 - 0.6, 0.6 - 0.7, 0.7 - 0.8, 0.8 - 1.1, 3.5 - 4.1 and 10.4 - 12.6 µm. Spatial resolution is 210 m (in VIS) and 700 m (TIR). Swath width is 600 km.
• MP-900B TV Camera
  The objective is the monitoring of reflected radiation of the Earth's surface and atmosphere in the VIS and NIR spectral regions. The spatial resolution of the imagery is 1.6 km m × 1.8 km.
• RMK-M Radiation Measurement Control
  RMK-M is an instrument of RMK-2 heritage flown on the Meteor-3 series satellites. The objectives are the registration of flux densities of protons in the 1 - 90 MeV and electrons in the 0.17 - 3.0 MeV energy regions. Measurement of galactic radiation with energies above 600 MeV.
• ISP-2 Solar Constant Instrument:
  The objective is the measurement of the integral solar irradiation and of the shortwave reflected radiation of the Earth system. It is being used to complement the ScaRaB measurements. The ISP-2 radiometer consists of two channels with bolometer detectors.
• NINA New Instrument for Nuclear Analysis:
  NINA is a compact telescope, developed by INFN (Italian National Institute of Nuclear Physics) of Rome, Italy and MEPhI (Moscow Engineering and Physics Institute). The objective is to measure fluxes of charged particles, in particular to detect cosmic ray nuclei of galactic, solar, or other origin from hydrogen to iron, between 10 and 200 MeV/n.
• ScaRaB-2 Scanner for Radiation Budget:
  ScaRaB is a joint development (CNES, Planeta and GKSS) of a cross-track scanning radiometer. The objective of ScaRaB-2 is the collection of data on shortwave and longwave radiation (reflected solar and emitted thermal radiation) to estimate the Earth's radiation budget at the top of the atmosphere on global and regional scales. The instrument features four channels. Channels 2 and 3 are considered the main channels, while channels 1 and 4 are auxiliary channels. The optical subsystem features four parallel telescopes, one telescope per channel, they are identical except for their filters.

Resurs-O1 N4 carried a number of small subpayloads. ESA's IRIS 1 (Intercontinental Retrieval of Information via Satellite) payload remained intentionally attached. The objective was to provide a low-cost, worldwide electronic mail commercial service. Additionally, several microsatellites were deployed from the spacecraft.

Resurs-O1 N4 operated until April 1999 when a communication failure disrupted the service. The spacecraft ended its operational service on Feb. 7, 2002.

The Resurs-O2 series was to succeed Resurs-O1 N4, but due to the tight economic situation in Russia, it was cancelled. The smaller Monitor-E mission is considered a continuation of the Resurs-O1 N4 mission.