Stafford Jason W, Duncan Bradley D, Dierking Matthew P
EO Combat Branch, 3109 Hobson Way, Building 622, AFRL/RYJM,Wright-Patterson AFB, Ohio 45433-7700, USA.
Appl Opt. 2010 Apr 20;49(12):2262-70. doi: 10.1364/AO.49.002262.
By synthesizing large effective apertures through the translation of a smaller imaging sensor and the subsequent proper phasing and correlation of detected signals in postprocessing, holographic aperture ladar (HAL) systems seek to increase the resolution of remotely imaged targets. The stripmap HAL process was demonstrated in the laboratory, for the first time to our knowledge. Our results show that the stripmap HAL transformation can precisely account for off-axis transmitter induced phase migrations. This in turn allows multiple pupil plane field segments, sequentially collected across a synthetic aperture, to be coherently mosaiced together. As a direct consequence, we have been able to confirm the capability of the HAL method to potentially provide substantial increases in longitudinal cross-range resolution. The measurement and sampling of complex pupil plane field segments, as well as target related issues arising from short laboratory ranges, have also been addressed.
通过平移较小的成像传感器合成大有效孔径，并在后续处理中对检测到的信号进行适当的相位调整和相关性处理，全息孔径激光雷达（HAL）系统试图提高远程成像目标的分辨率。据我们所知，条带测绘HAL过程首次在实验室中得到演示。我们的结果表明，条带测绘HAL变换可以精确地解释离轴发射器引起的相位迁移。这反过来又允许在合成孔径上顺序采集的多个光瞳平面场段被相干拼接在一起。直接的结果是，我们已经能够证实HAL方法有潜力大幅提高纵向横向分辨率。还讨论了复光瞳平面场段的测量和采样，以及由于实验室距离较短而产生的与目标相关的问题。
