I've uploaded a few papers which I could find. Others can be requested via the RG links below. It was intriguing to note that hyperspectral remote sensing could be employed in detecting chemical and biological weapons and another very interesting paper is on using animals as sensors. Microwaves and RADAR have been used quite extensively for reconnaissance missions. Try to get in touch with the researchers, I'm sure they will have more ideas. All the best for your doctorate degree.