An Efficient Algorithm for Inversion of Truncated Spiral Cone Beam Data

提出了一种新的傅里叶变换光谱（FTS）方法。FTS的主要优点是与色散或滤波光谱仪相比，吞吐量有了巨大的提高。然而，传统的FTS技术需要一个精确的扫描镜。这一要求大大增加了成本，并且很难从移动平台或动态目标上实现。最近的一项技术不需要扫描。这提供了同时获取所有光谱波段的能力，允许从移动平台获得高空间分辨率，提高可靠性，降低质量，体积和成本。然而，这些非扫描FTS尚未能够利用FTS的巨大潜在吞吐量优势，因为它们需要在“推扫帚”模式下操作。在这种模式下，狭窄的狭缝将视场（FOV）遮挡到狭窄的条带，这严重降低了吞吐量。该方法采用反褶积技术提供沿轨道的空间分辨率，而不需要窄场掩模。因此，该技术可以同时提供传统傅里叶变换的吞吐量优势和非扫描傅里叶变换的所有优点。成像光谱法是研究地球科学，特别是土地覆盖和土地利用变化的有力工具。当应用于空间科学，特别是探索太阳系时，成像光谱法是确定全球表面矿物学的主要工具，对大气成分的研究也很有用。在人类空间探索和发展中，光谱法被用于通过观察排气羽流来诊断可重复使用的火箭发动机。与目前的成像光谱技术相比，所提出的技术提供了10到1000倍的吞吐量优势，从而大大提高了辐射分辨率。没有运动部件提高了可靠性，降低了成本、质量和功率要求。

A new approach for Fourier transform spectrometry (FTS) is proposed. The principal advantage of FTS is the tremendous throughput improvement compared to dispersive or filter spectrometers. Traditional FTS techniques, however, require a precision scanning mirror. This requirement significantly increases the cost, and is difficult to implement for use from a moving platform or for a dynamic target. A more recent technique does not require scanning. This provides the ability to acquire all spectral bands simultaneously, allows high spatial resolution from a moving platform, improves the reliability, and lowers the mass, volume and cost. These non-scanning FTS, however, have yet been unable to exploit the tremendous potential throughput advantage of FTS, since they require operation in a "pushbroom" mode. In this mode, a narrow slit masks the field-of-view (FOV) to a narrow strip and this severely reduces the throughput. The proposed approach uses deconvolution techniques to provide spatial resolution along-track, without the need for a narrow field mask. This technique can therefore simultaneously provide both the throughput advantage of traditional FTS, and all the advantages of non-scanning FTS.Imaging spectrometry is a powerful tool for Earth Science, particularly for investigation of land cover and land use change. When applied to Space Science, particularly exploration of the solar system, imaging spectrometry is the primary tool for global determination of surface mineralogy and is also useful for studies of atmospheric composition. In Human Exploration and Development of Space, spectrometry is being employed for diagnostics of reusable rocket engines, by observation of the exhaust plume. The proposed technique provides a factor of 10 to 1000 advantage in throughput compared to current techniques for imaging spectrometry, allowing greatly improved radiometric resolution. The absence of moving parts improves the reliability and lowers the cost, mass and power requirements.