1. A remote sensing system, comprising: a first light source for emitting infrared light of a first central wavelength; a second light source for emitting infrared light of a second central wavelength band different from the first central wavelength; a first image capturing device capturing two different images of the first and second light sources, a second image capturing device capturing two different images of the first and second light sources, the image capturing devices each comprising an infrared sensitive image sensor and an infrared pass filter having two passbands for respectively allowing the infrared light of the first and second central wavelengths to pass therethrough; a processing unit for analyzing the images captured by the first and second image capturing devices thereby determining positions of the light sources relative to the image capturing devices.