Spectrum Reconstruction Method for Airborne Temporally–Spatially Modulated Fourier Transform Imaging Spectrometers

Temporally-spatially modulated Fourier transform imaging spectrometers (TSMFTISs) have no internal moving parts and have high throughput advantages. In recent years, TSMFTISs have become a research and development focus for spaceborne missions. However, the applications of TSMFTISs for airborne missions are limited because the conventional spectrum reconstruction algorithm requires high stability of the platform during the pushbroom process. To overcome this limitation, we propose a target-tracking-based spectrum reconstruction method for airborne TSMFTISs. The direct georeferencing and motion estimation methods are incorporated for target tracking. The principle of TSMFTIS is presented to discuss the limitation of the traditional spectrum reconstruction method. A simulation based on the proposed scheme was performed to provide preliminary spectrum reconstruction results for the airborne TSMFTIS. The reconstructed spectra have much better agreement with the ideal spectrum than the traditional algorithm does.