Modeling Pushbroom Scanning Systems

S. Koduri
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引用次数: 1

Abstract

The present study aims at modeling push broom imaging systems on board a spacecraft with a full force rigorous orbital photogrammetric mode as a digital solution. During the modeling stage, we adopt a hybrid time domain model wherein keplerian orbital parameters are modeled in continuous time domain, while attitude parameters are, modeled as polynomials in discreet time domain. The output of the model is subsequently used to realize an ortho-rectified image by single stage resampling. The image rectification procedure adopted is based on back projection by indirect method but is redesigned to eliminate several unnecessary computations that are made on a pixel by pixel basis and is illustrated with a Spot data set. The study illustrates the excellent and very promising potential of adopting Singular Value Decomposition SVD in the bundled adjustment process. The study brings out that this two stage approach results in a significant reduction in computational time while retaining the product location accuracy. Geometric rectification is made by a single stage resampling, which significantly enhances the radiometric fidelity of the processed data when compared with conventional techniques used in operational environments.
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推扫扫描系统建模
本研究旨在以全力严格轨道摄影测量模式为数字解决方案,对航天器上的推扫帚成像系统进行建模。在建模阶段,我们采用了一种混合时域模型,其中开普勒轨道参数在连续时域建模,姿态参数在离散时域建模为多项式。该模型的输出随后通过单级重采样实现正交校正图像。采用的图像校正过程是基于间接反投影的方法,但经过重新设计,消除了在逐像素的基础上进行的一些不必要的计算,并使用Spot数据集进行说明。该研究说明了在捆绑平差过程中采用奇异值分解SVD的良好和非常有前途的潜力。研究表明,这种两阶段方法在保持产品定位精度的同时显著减少了计算时间。通过单级重采样进行几何校正,与在操作环境中使用的传统技术相比,显著提高了处理数据的辐射保真度。
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