The tremendous potential for hyperspectral imagery as a remote sensing tool has driven the development ofTRW's TRWIS ifi hyperspectral imager. This instrument provides 384 contiguous spectral channels at 5 nm to 6.25 nm spectral resolution covering the 400 rim to 2450 rim wavelength range. The spectra ofeach pixel in the scene are gathered simultaneously at signal to noise ratios of several hundred to one for typical Earth scenes. Designed to fly on a wide range of aircraft and with variable frame rate, the ground resolution can be varied from approximately 50 cm to 1 1 m depending on the aircraft altitude and speed. Meeting critical performance requirements for image quality, coregistration of spectral samples, spectral calibration, noise, and radiometric accuracy are important to the success ofthe instrument. TRWIS ifi performance has been validated and the instrument has been radiometrically calibrated using TRW's Multispectral Test Bed (MSTB). This paper discusses the characterization and calibration process and results ofthe measurements. An example ofresults from a flight at the end of 1996 is included.
Hyperspectral imaging (HSI) spectrometers are remote sensing instruments that acquire images in a large number, typically hundreds, of contiguous spectral channels throughout the visible to long‐wave infrared (IR) portions of the spectrum from 0.4 to 14 µm.1 These systems are usually flown on aircraft platforms and use either platform motion or mirror mechanisms to scan a region of the earth's surface. The high‐resolution spectral features represented in the data cube allow for discrimination of materials in a scene. Because of the large number of spectral channels that are acquired by these instruments, they are termed hyperspectral, in contrast to multispectral instruments that obtain relatively few spectral bands. Like all remote sensing technologies, HSI must contend with data perturbations caused by atmospheric effects. In addition, data analysis must account for spectral mixing of multiple constituent materials within each pixel's field of view (FOV).
Northrop Grumman Aerospace Systems (NGAS) has a long legacy developing and fielding hyperspectral sensors, including airborne and space based systems covering the visible through Long Wave Infrared (LWIR) wavelength ranges.Most recently NGAS has developed the Hyperspectral Airborne Terrestrial Instrument (HATI) family of hyperspectral sensors, which are compact airborne hyperspectral imagers designed to fly on a variety of platforms and be integrated with other sensors in NGAS's instrument suite. The current sensor under development is the HATI-2500, a full range Visible Near Infrared (VNIR) through Short Wave Infrared (SWIR) instrument covering the 0.4 -2.5 micron wavelength range with high spectral resolution (3nm). The system includes a framing camera integrated with a GPS/INS to provide high-resolution multispectral imagery and precision geolocation. Its compact size and flexible acquisition parameters allow HATI-2500 to be integrated on a large variety of aerial platforms. This paper describes the HATI-2500 sensor and subsystems and its expected performance specifications.
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