Phase modulation of multiple coherence have important application foreground in electronic warfare. This paper is
aimed at discussing the influence of the plane matrix multiple coherence on the oscillation characteristic of phase
modulation. Because of its special background of application, we knew that the study of this problem hasn’t been
reported. The similar study on the problem is coherent combining of fiber laser. The significance of phase modulation is
to make the phase of every coherence unit time variation rule so that it can realize special purpose in actual application.
When we set up the model of the numerical simulation, we take harmonic phase modulation for the sake of simplicity but
to illustrate this problem.
Proc. SPIE. 7382, International Symposium on Photoelectronic Detection and Imaging 2009: Laser Sensing and Imaging
KEYWORDS: Target detection, Mirrors, Beam splitters, Digital signal processing, Detection and tracking algorithms, Sensors, Signal processing, Digital electronics, Signal detection, Optical attenuators
A new experimental method is put forward for the influence of two laser spots on the direction deviation in four-quadrant
photoelectric detection for laser guidance. The experimental apparatus and findings are given. The results are: in two
cases of spot size, the curve of the relative center direction deviation vs. relative intensity difference of two laser spots;
the deviation error in each quadrant under the condition of relative intensity difference value less than 2%. It is
concluded that smaller relative intensity difference and larger spot size are beneficial to the decrease of the deviation
error. Based on the experiments a new scheme of twelve -quadrant photoelectric detection to eliminate the influence of
jamming spot on laser guidance is proposed: The twelve -quadrant photoelectric detector is composed of three
four-quadrant photoelectric detectors arrayed in left, middle and right side. When a jamming spot appears, its relative
position is judged by the circuit. When spots simultaneously appear in two quadrant photoelectric detectors, only the
signal of target spot is put into succeeding control circuits, so the influence of jamming spot is eliminated.