Proceedings Article | 9 October 2008
Proc. SPIE. 7106, Sensors, Systems, and Next-Generation Satellites XII
KEYWORDS: Signal to noise ratio, Short wave infrared radiation, Modulation, Polarization, Sensors, Calibration, Fourier transforms, Charge-coupled devices, CCD image sensors, Atmospheric modeling
In order to validate and calibrate TANSO-FTS data of the GOSAT satellite, and also to develop the retrieval algorism
for deriving the column density of CO2 and CH4 from spectra, the airborne SWIR (Short Wave Infrared Region) FTS
(Fourier transform spectrometer) has been developed, characterized and demonstrated. This instrument is named as
TSUKUBA model. The basically performance test of TSUKUBA model was carried out in our laboratory, and the
measured modulation efficiencies are 70% (Band1), 85% (Band2) and 88% (Band3), respectively. The measured values
of SNR with the equivalent black body temperature for 30% surface albedo are 190 (13050cm-1), 148 (6200cm-1), and
165 (5000cm-1) without polarization measurement. The measured values of full width at half maximum (FWHM) of
instrumental line shape functions are 0.38cm-1, 0.26cm-1, 0.25 cm-1 of band 1, 2, and 3, respectively. This instrument is
also able to measure the scene flux with P and S polarization, simultaneously, as TANSO-FTS SWIR measures. In 2007,
the first and second flight campaigns were arranged and the sunlight reflected spectra over the earth's surface was
obtained. This instrument was mounted on high-altitude airplane with image motion compensator and damping platform,
and flied over southern Australia and Siberia. The instrumental design and the results of performance tests as well as the
flight campaign are presented.
