Citation: | Sun Chunsheng, Zhang Shuang, Zhang Xiaohui. Deceiving ability of typical natural objects used for false target in laser decoy jamming[J]. Opto-Electronic Engineering, 2019, 46(1): 180453. doi: 10.12086/oee.2019.180453 |
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Overview: Laser decoy jamming is an effective way to combat semi-active laser guided weapons. Diffuse reflecting targets or natural objects are usually used as false targets in laser decoy jamming system. The deceiving ability of the false targets directly determines the layout method and application effect of the false targets. Due to the Lambert reflection characteristics of diffuse reflector target, its deflection ability is easy to be known, while the laser reflection characteristics of natural objects are much more complex. The deflection ability of natural objects is affected by many factors, such as the type of natural object, the parameters of incident laser and the seeker parameters of incoming missile. It is of great significance to study the deflection ability of natural object false target under typical conditions for improving the flexibility of laser decoy jamming system and giving full play to its combat effectiveness. The deceiving ability characterized by effectual decoy airspace of typical natural objects was calculated and analyzed in this paper. Firstly, on the premise of fully considering the target reflection characteristics, jamming-indicating laser intensity, atmospheric laser attenuation coefficient and other factors, the analysis model of false target deflection ability was established under the condition of signal suppression coefficient K (≥1), which was a complex expression related to the bidirectional reflection distribution function of false target and the parameters of application conditions. Then, a five-parameter semi-empirical statistical model based on the Torrance-Sparrow model was selected to describe the bi-directional laser reflection characteristics of typical natural objects. The undetermined parameters in the statistical model were derived from the research results of existing literatures, and the parameters related to the application conditions in the deflection analysis model were based on the general engineering practice. Based on these preconditions, the effective decoy airspace of typical natural object false targets was calculated and the deceiving ability was analyzed. The results show that the effective cheating airspace of false target is closely related to the type of targets, and the deceiving ability of vegetation, gravel and diffuse reflection objects is enhanced in turn under the same conditions. There exists a mirror reflection component that is much smaller than the diffuse reflection component in the decoy airspace of vegetation and gravel natural objects, and for vegetation targets, the variation of the incident angle of jamming laser has obvious influence on the distribution of effectual decoy airspace. However, there is no obvious trend change rule of the decoy airspace with the incidence angle. The research results are instructive for the reasonable application of typical natural objects used as false target.
Three-dimensional distribution of BRDF (a) and polar coordinates distribution of effectual decoy airspace (b) for vegetation object
Three-dimensional distribution of BRDF (a) and polar coordinates distribution of effectual decoy airspace (b) for gravel object
Three-dimensional distribution of BRDF (a) and polar coordinates distribution of effectual decoy airspace (b) for diffuse reflection object
Three-dimensional distribution of BRDF (a) and polar coordinates distribution of effectual decoy airspace (b) for vegetation object under incident angle θi=10°
Three-dimensional distribution of BRDF (a) and polar coordinates distribution of effectual decoy airspace (b) for vegetation object under incident angle θi=30°
Three-dimensional distribution of BRDF (a) and polar coordinates distribution of effectual decoy airspace (b) for vegetation object under incident angle θi=60°