多源航天光学影像的定位模型

针对星历和有理多项式系数(Rational Polynomial Coefficients,RPC)两种主要类型辅助数据的多源光学卫星影像,以地固地心直角坐标系(Earth-Centered Earth-Fixed,ECEF)作为统一的物方坐标系,在其中构建了有理函数和共线方程,对各类常见影像的辅助数据给出了相应的转换方法,进而以联合平差的方式建立了一种光学卫星影像定位的混合/集成模型,并对4种传感器影像进行了试验验证.建立的模型考虑了影像定向参数和传感器定标参数的差异,对不同航天光学影像的独立或联合定位有较广的适应性.

An Integrated Geometric Model for Multi source Spaceborne Optical Imagery

RPC parameters and ephemeris parameters are two main types of orientation parameters which provide as auxiliary data for satellite images. This paper presents a conversation method for the orientation parameters so the data can be easily used in Earth-Centered Earth-Fixed (ECEF) coordinate system. We rebuild RPC and collineariy equation in ECEF and integrate the two geometric imaging equations to one positioning model by combined adjustment for multi-source spaceborne optical imagery. Several tests for 4 sensor images are given, and the analyses for the model and its application are provided. The proposed model in this paper can be widely suitable for different cases where parameters of imagery orientation or sensor geometric calibration are different. Keywords: imagery positioning; integrated geometric model; spaceborne optical imagery; rigorous sensor model; RPC model.