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Bootstrap beacon creation technique for lower altitude and ground based targets

机译:Bootstrap Beacon创建较低海拔和地面目标的创建技术

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The task of delivering a sufficient amount of laser energy to the ground based targets and the targets located at lower altitudes is of a high interest. The laser beam propagating through atmosphere is significantly degraded by the turbulence. As a result, the laser beam arriving at the target does not have sufficient amount of power. To overcome the degradations induced by atmospheric turbulence the artificial beacon for probing the atmospheric conditions is needed. The current techniques implementing a Rayleigh beacon at the target or at some intermediate distance between the transmitter and the target provide some means of improvement. In this work we extend our work on earlier proposed bootstrap technique in- volving creating multiple beacons between the laser transmitter and the target. In the bootstrap technique, the light from each beacon is propagated back to the wavefront sensor located at the receiver. Signal from the wavefront sensor is processed to generate commands for the deformable mirror and the next beacon gets pre-compensated for the further distance. The process continues till the last beacon is created at the target. We have previously reported the results on implementation of the bootstrap techniques on ground based targets demonstrating noticeable improvement in the final laser beam power at the target. In this work we examine the possibility of using the bootstrap technique for cases when laser energy needs to be delivered over nearly horizontal propagation distances and at lower altitudes. The system performance is examined using both Hufnagel-Valley and Hufnagel/Andrews/Phillips models for structure constant Cn~2 characterizing the strength of the index of refraction fluctuation, and compared with the sceneries when the beacon is generated directly on the target or at some intermediate positions between the transmitter and the target.
机译:将足够量的激光能量提供给地面的靶标的任务以及位于较低高度的目标具有高兴趣。通过大气传播的激光束被湍流显着降低。结果,到达目标的激光束没有足够的功率。为了克服由大气湍流引起的降解,需要用于探测大气条件的人工标灯。在目标处实现Rayleigh信标的当前技术或发送器之间的一些中间距离提供一些改进手段。在这项工作中,我们将我们的工作扩展到早期提出的Bootstrap技术,在激光发射器和目标之间创建多个信标。在引导技术中,来自每个信标的光被传播回位于接收器处的波前传感器。处理来自波前传感器的信号以生成可变形镜的命令,并且下一个信标被预补偿到进一步的距离。该过程持续到目标在目标上创建最后一个信标。我们之前报道了基于目标的基于目标的引导技术的实施结果,证明了目标最终激光束功率的显着改善。在这项工作中,我们检查在几乎水平传播距离和较低海拔地区的激光能量时使用自举技术的案例的可能性。使用HUFNAGEL-VALLEY和HUFNAGEL / ANDREWS / PHILLIPS / PHILLIPS模型来检查系统性能,用于结构常数CN〜2,表征折射波动指数的强度,并与当信标直接在目标上生成或某些方面的风景相比发射器和目标之间的中间位置。

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