Aplicação do movimento kepleriano na orientação de imagens HRC - CBERS 2b

Abstract

RESUMONos últimos 20 anos, pesquisas voltadas ao desenvolvimento de modelos rigorosos para a orientação de sensores orbitais puhbroom lineares vêm sendo desenvolvidas e apresentadas. Na maioria destas pesquisas, a trajetória e a orientação do satélite durante a formação das cenas são obtidas a partir de polinômios de 1º, 2º e até 3º grau. Porém, a atribuição de significado físico aos coeficientes polinomiais indica que o primeiro e o segundo termo se referem à velocidade e a aceleração da plataforma no instante referente à aquisição da primeira linha da cena.

A Novel Model for Orientation of Linear Optical Satellite Images Based in the Adaptation of the Orbit-Attitude Model

“…This creates a difference in the moment of obtaining the sub-images provided by these chips, causing a systematic error in the process of formation of final image with 12246 columns. For this reason, in experiments performed by Marcato Junior (2011), Marcato Júnior et al 2011, Marcato Júnior and Tommaselli (2013) and Rodrigues and Ferreira (2013), is possible to verify a decrease of accuracy in North direction. Additionally, the planimetric resulting accuracies presented larger than 1 pixel (2.7 m).…”

“…In this research this model is going to called Modified UCL Kepler platform model. Application examples with the original UCL Kepler platform model can be seen in Dowman and Michalis (2003) with ASTER images; Michalis and Dowman (2004), Michalis (2005), Michalis and Dowman (2006), Michalis and Dowman (2008a) with HRS SPOT 5 images; Michalis and Dowman (2008b) with CARTOSAT I images; Dowman, Michalis and Li (2011), Michalis and Dowman (2010); Rodrigues and Ferreira (2013) with HRC CBERS 2B images.…”

“…This last combining Ground Control Points (GCPs) and Ground Control Lines (GCLs). Also in Rodrigues and Ferreira (2013), two HRC images were oriented using Position-Rotation model in conjunction with a 2 nd order polynomial platform model and original UCL Kepler platform model. In Rodrigues et al (2016) on-orbit geometric calibration of HRC sensor was performed using Position-Rotation model and Modified UCL Kepler platform model.…”

Accuracy Improvements in the Orientation of ALOS PRISM Images Using IOP Estimation and UCL Kepler Platform Model

“…where X 0 , Y 0 , Z 0 and u x , u y , u z are, respectively, the position and velocity components of the sensor PC at the time at which the first line of the image was obtained; t is the acquisition time of an image line; and GM is the standard gravitational parameter. The rotation angles of the sensor may be considered constant during the image acquisition time [16] or can be propagated by polynomials [8][9][10]12], depending on the satellite's motion characteristics. In this research, the rotation angles ω and φ were considered invariant since the image acquisition occurred in approximately 6 s and the attitude control of the ALOS has sufficient accuracy [17].…”

“…Another issue in the use of rigorous models is the platform model, which is responsible for modelling the changes in EOP during the generation of two-dimensional images. Over the years, several studies have proposed different platform models associated with the principle of collinearity [8][9][10]. Based on the platform model using second order polynomials, Michalis [11] associated the linear terms to the satellite velocity components and quadratic terms to the acceleration components.…”