Open AccessAnalysis of an Co-phasing detecting method based on far-field images of sparse-optical-synthetic-aperture system
Author(s) -
Zheng Liu,
Shengqian Wang,
Rao Chang-Hui
Publication year - 2012
Publication title -
wuli xuebao
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.199
H-Index - 47
ISSN - 1000-3290
DOI - 10.7498/aps.61.039501
Subject(s) - phaser , piston (optics) , computer science , aperture (computer memory) , optics , telescope , near and far field , realization (probability) , synthetic aperture radar , field (mathematics) , similarity (geometry) , physics , computer vision , image (mathematics) , wavefront , acoustics , mathematics , pure mathematics , statistics
For the sparse-optical-synthetic-aperture telescope system, the co-phasing detection plays an important role for the realization of system's high resolution in solving out piston errors between sub-apertures. In this paper, the relationship between piston error and system's far-field intensity was analyzed based on physical principles, then the impact of piston error on system's far-field images was clarified theoretically. Furthermore, an innovative co-phasing detecting method based on the far-field images' similarity was approved for the bi-sub-aperture systems, with its feasibility, detecting deviation and dynamic range were researched by simulation. The results proved that, with this method, the piston error between the system's two sub-apertures can be soundly detected principally while immune from the problems of 2 ambiguity and direction decision that might exist within some other co-phasing detecting methods. Plus its dynamic range shown from these results, this new co-phasing detecting method provides effective references for deeper research of co-phasing detecting techniques.