Table 1.

Proposed technical TIR spectrometer and imager requirements.

Parameter	Spectrometer	Broadband Imager
Spectral range	7.2–12.5 µm	7.2–12.5 µm
No. of channels	30–75	2
Wavelength accuracy	FWHM/40 –
	FWHM/20
NEDT (instrument)	0.05 K–0.1 K @ 300 K	<0.01 K @ 300 K
Absolute ΔT	1 K @ 300 K	1 K @ 300 K
Thermal range	250–340 K	250–340 K
Radiometric quantisation	14-bit	14-bit
Ground sampling distance at nadir	60 m	20 m
Dynamic range	Observations of targets of up to 330 K temperature without pixel saturation.
Integrated energy	≥50%.
Radiometric on-board calibration	Yes
Swath width	60–120 km	60–120 km