Specifications

• Frequency: 1.26 GHz
• Polarizations: VV, HH, HV (not fully polarimetric)
• Relative accuracy (3 km grid): 1 dB (HH and VV), 1.5 dB (HV)
• Data acquisition:
• High-resolution (SAR) data acquired over land
• Low-resolution data acquired globally

• Frequency: 1.41 GHz
• Polarizations: H, V, 3rd & 4th Stokes
• Relative accuracy (30 km grid): 1.3 K
• Data collection:
• High-rate (sub-band) data acquired over land
• Low-rate data acquired globally

• Conically-scanning deployable mesh reflector shared by radar and radiometer
• Diameter: 6 meters
• Rotation rate: 14.6 RPM
• Beam efficiency: ~90%
• Spatial Resolution:
• Radiometer (IFOV): 39 km x 47 km
• SAR: 1-3 km (over outer 70% of swath)
• Swath width: 1000 km

Antenna System

Radar Data
The radar high-resolution measurement samples are created within the radar real-aperture footprint by synthetic aperture processing in range and azimuth. The synthesized single-look samples have variable spatial resolution in the azimuth direction. The single-look samples are averaged (multi-looked) onto 1-km grid pixels to form the L1C_S0_HiRes data product. The spatial resolution of the data in this product is better than 3 km over the outer 70% of the 1000-km swath.
(See Radar resolution and gridding.)

The L1C_S0_HiRes HH and VV data have uncertainty from all sources (excluding rain) of 1.0 dB or less (1-sigma) defined at 3 km spatial resolution and for surfaces of radar cross-section greater than -25 dB. The HV data have uncertainty from all sources (excluding rain) of 1.5 dB or less (1-sigma) defined at 3 km spatial resolution and for surfaces of HV radar cross-section greater than -30 dB.

Radiometer Data
The radiometer instantaneous field of view (IFOV) or 3-dB footprint is 39 km x 47 km. The radiometer L1B_TB data product includes compensation for effects of antenna sidelobes (outside the main beam), cross-polarization, Faraday rotation, atmospheric effects (excluding rain), and solar, galactic and cosmic radiation.

The L1B_TB have mean uncertainty from all sources (excluding rain) of 1.3 K or less (1-sigma) in the H and V channels, defined on the basis of binning the fore- and aft-look samples onto hypothetical swath-oriented 30 km x 30 km grid cells (a different grid is used for the actual L1C_TB data product).