Evaluation of positioning error-induced pixel shifts on satellite linear push-broom imagery

Abstract

Abstract. Georeferencing is one of the major tasks of satellite-borne remote sensing. Compared to traditional indirect methods, direct georeferencing through a Global Positioning System/inertial navigation system requires fewer and simpler steps to obtain exterior orientation parameters of remotely sensed images. However, the pixel shift caused by geographic positioning error, which is generally derived from boresight angle as well as terrain topography variation, can have a great impact on the precision of georeferencing. The distribution of pixel shifts introduced by the positioning error on a satellite linear push-broom image is quantitatively analyzed. We use the variation of the object space coordinate to simulate different kinds of positioning errors and terrain topography. Then a total differential method was applied to establish a rigorous sensor model in order to mathematically obtain the relationship between pixel shift and positioning error. Finally, two simulation experiments are conducted using the imaging parameters of Chang' E-1 satellite to evaluate two different kinds of positioning errors. The experimental results have shown that with the experimental parameters, the maximum pixel shift could reach 1.74 pixels. The proposed approach can be extended to a generic application for imaging error modeling in remote sensing with terrain variation.

Metasurfaces-based polarisation imaging systems for small form-factor satellites

“…Illustrated in Figure 1, this imaging method is well established in remote sensing, in which a narrow strip of the Earth's surface is imaged perpendicular to the satellite movement, and a full image is formed over time. [17][18][19] Previous works have diffractively separated this imaging strip into simultaneous wavelength measurements for hyperspectral imaging; 20,21 we will use this same principle for our polarisation measurements in our metasurface design.…”