Optical aperture 31.1 cm Type optics Cassegrain Methods of scan Two axes, step and dwell E/W 280-urad steps N/S 1120-urad steps (or 2240-urad with 0.1 or 0.2-s dwell) Spatial resolution 242 urad (10 km) Sampling Four IGFOVs sampled at the same time Sampling rate 40 soundings/sec 0.1, 0.2, or 0.4 s per sample Spectral band coregistration Within 22 urad of IR 10.7-um window Data output 13-bit quantization Data rate 40 kb/sec Time between space looks 2 min Time between blackbody calibrations 20 min
Table 1. GOES-8 Sounder instrument features.