NOAA KLM User's Guide
The HIRS/4 instrument will be flown on NOAA-N and -N'. Several modifications have been made: 1) the field of view has decreased to 10 km from 19 km for the HIRS/3; 2) another PRT has been added to the blackbody. This is directly in the center and will give a better characterization of the temperature gradient as well as providing a better estimate of the blackbody temperature within the smaller angular field of view; and 3) there is a new temperature sensor near the field stop. Table 184.108.40.206-1 contains a detailed description of the characteristics of the HIRS/4 instrument.
Amended April 19, 2004
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