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提高激光雷达对空间小目标探测能力的重要手段是增大发射到目标上的光强,激光相干合成是在目标上获得较大光强的有效途径.为了评价相干光束在目标上的合成效果,引入了适合空间小目标探测的相干合成效果评价参数(合成效果因子),在此基础上讨论了光束相干合成效果的影响因素.研究表明:合成效果因子随合成光束束腰间距的增大呈周期振荡变化,振荡幅度逐渐减小;达到理想合成效果需要的光束传输距离随光束间距的增大而增加,这对设计相干合成系统光束束腰间距具有参考意义.同时,还研究了光束的相位控制精度与合成效果之间的关系.结果表明:当相位控制精度达到π/4时,合成效果可以达到理想效果的80%;当相位控制精度为π/2时,合成效果降为理想效果的50%.研究还表明,激光偏振方向不平行对合成效果的影响不明显.
An important way to improve the capability of laser radar to detect small targets is to increase the intensity of light emitted to the target.It is an effective way to obtain large intensity of light at the target.For the purpose of evaluating the synthetic effect of coherent beam on the target, The coherent synthesis effect evaluation parameters (synthesis effect factor) suitable for small space target detection are introduced, and the influencing factors of coherent beam synthesis are discussed. The results show that the synthesis effect factor increases with the increase of beam waist length The variation of oscillation and the amplitude of oscillation decrease gradually.The transmission distance of beam needed to achieve the ideal composite effect increases with the increase of beam spacing, which has reference significance for designing the beam waist distance of coherent composite system.At the same time, the phase control The results show that when the phase control accuracy reaches π / 4, the synthetic effect can achieve 80% of the ideal effect. When the phase control accuracy is π / 2, the synthetic effect is reduced to the ideal one. The research also shows that the laser polarization direction is not parallel to the synthesis effect is not obvious.