Target position extraction based on instantaneous frequency estimation in a fixed-reticle seeker

Abstract

To extract a precise target position in the presence of infrared countermeasures and significant noise, we propose a new algorithm based on the instantaneous frequency (IF) estimation of the sinusoidal frequency modulation (SFM) signals for a fixed-reticle seeker. To estimate the IF for target position extraction, the proposed algorithm maps the multicomponent SFM signal into the time-frequency plane to examine its time-frequency distribution, and then applies the Hough transform. The simulation results show that the proposed algorithm can extract the target position efficiently in the presence of flare countermeasures and noise. (C) moo society of Photo-Optical Instrumentation Engineers. [S0091-3286(00)00209-9].