The Hyperion instrument was launched November 21, 2000 mounted on the EO-1 spacecraft into orbit 1 minute behind Landsat-7. Hyperion has a 7.5 km swath width, a 30 meter ground sample distance (GSD) and more than 220 spectral bands. Part of the on-orbit characterization involves MTF measurements from several ground scenes. These scenes included edges from the moon and glaciers as well as several bridges. The scenes were processed to determine the MTF for both the Visual Near InfraRed (VNIR) and Short-wave InfraRed (SWIR) imaging spectrometers and were compared to measurements made prior to launch.
The Hyperion instrument was launched November 21, 2000 mounted on the EO-1 spacecraft into orbit 1 minute behind Landsat-7. Hyperion has a 7.5 km swath width, a 30 meter ground sample distance (GSD) and more than 220 spectral bands. Part of the on-orbit characterization involves MTF measurements from several ground scenes. These scenes included edges from the moon and glaciers as well as several bridges. The scenes were processed to determine the MTF for both the Visual Near InfraRed (VNIR) and Short-wave InfraRed (SWIR) imaging spectrometers and were compared to measurements made prior to launch.
Minimum Resolvable Temperature (MRT) is a subjective test technique used to demonstrate the performance of thermal imaging sensors with human observers. To measure MRT, Northrop Corporation has developed an automated test method that is closely related to the traditional MRT. This paper presents the results of automated MRT testing in the Consolidated Automated Support System (CASS) Electro Optical Subsystem (EOSS). It compares the automated MRT to traditional MRT data from the same thermal imaging sensor, and describes the theory of MRT as it relates to automated testing. The reasons for developing automated MRT testing are explored, as is the motivation for promoting acceptance of this kind of testing. Figure 1 diagrams the traditional MRT test setup. Highemissivity bar target masks, with one or more target patterns of different sizes, are installed into calibrated differentialtemperature blackbody sources. Each bar target pattern is a square composed of four rectangular aperture bars and three interspersed opaque bars. Each bar (open or solid) has a length seven times its width. Since MRT is a function of target spatial frequency, each available target frequency is used to generate one point on the measured MRT curve. To project the target image for presentation to the thermal imaging sensor under test, the blackbody source is installed in a collimator and positioned so that the bar target mask lies in the collimator focal plane. One operator controls the temperature difference between the target plate and the background, whilc an observer views the displayed bar chart images on the video monitor output of the sensor under test. The observer is allowed to freely adjust the Based on a presenration at Autotestcon '91 0885/Y985/921 $3.00 IEEE 1992.
rRADITIONAL MRT TEST DESCRIPTION
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