A temporal-spatio detection model and contrast calculation method on new active sky screen with high-power laser

Abstract

To improve the detection performance of sky screen under different background environments, this paper invents an active sky screen by using high-power laser light source to form active detection screen, which makes use of the advantages of the sky screen detection receiving light path and photoelectric detection sensor made of new materials. Based on the design method of active sky screen, the temporal-spatio detection model of active sky screen is established by combining the distribution characteristics of laser light sources in any position and detection screen parameters; the surface of projectile is decomposed into a multiple small units area, and the calculation function of projectile’s reflected laser power is deduced by using the superposition principle of the reflected laser energy of multiple small units area and four parameter BRDF. According to the features of blue sky and cloudy background, the different of the projectile’s reflected laser energy and the shading image energy of projectile itself is used to evaluate contrast and derive the new contrast calculation function of active sky screen. Through experimental testing and quantitative calculation analysis, the proposed computational model and contrast function are validated.