Fig. 7From: Frequency-swept feedback interferometry for noncooperative-target ranging with a stand-off distance of several hundred metersPower spectra of the conventional LFI system and FSFI system in ranging. PD noise, photodetector noise. LI noise, laser intensity noise. a-b LI noise is stronger than PD noise. c-d PD noise is stronger than LI noise. a and c are the results of the conventional LFI-based ranging system. b and d are the results of the FSFI-based ranging systemBack to article page