Photogrammetric Method with Distance Constraint for Profile of Inflatable Space Antenna

Abstract

The inflatable space antenna is gradually used in various spacecrafts because it is portable and foldaway. It is usually made of thin-film materials and has a flexible surface, so that measuring force is not tolerable in measurement process. Close-range photogrammetry is considered as an optimal solution because of its advantages of non-contact operation and fast data acquisition. To improve measuring precision, a method combining bundle adjustment algorithm and the distance constraint is presented in the paper. Two experiments under different conditions are accomplished and experiment results are compared. One experiment is completed with the distance constraint and another without. The experiment results are compared by two parameters: tightness and residuals. The measured object is an inflatable antenna with a 3.5-m diameter.

Camera Calibration with Baseline Distance Constraints

“…Knowledge of the second set of parameters is crucial because they will be considered as constant constraints in future projects. The approach presented follows a self‐calibration bundle adjustment with distance constraints, not among object features as might be common in close range photogrammetry (for example, van den Heuvel, 1998; Cornou et al, 2003; Luhmann et al, 2006; Deng et al, 2008) but among baselines, in other words the distances between perspective centres. This is an extended approach for multiple cameras based on the bundle adjustment of constrained stereopairs by convergence constraints presented by King (1995), without constraining the relative rotations among cameras.…”

Orientación espacial de múltiples sensores integrados con constreñimientos geométricos.

“…En sistemas fotogramétricos, la utilización de constreñimientos es un procedimiento muy común, como pueden ser el constreñimiento epipolar, inclusión de distancias conocidas entre puntos, acimuts, relaciones entre estacionamientos, etc. (Bruce King, 1995;Lerma, et al, 2010;Börlin, et al, 2004;Cornou, et al, 2003;Deng, et al, 2008;Van den Heuvel, 1998).…”