变形监测中GPS信号衍射误差的环境建模法

Mitigation of GPS Signal Diffraction Effect for Deformation Applications Based on Environment Modelling

信号衍射是GPS结构变形监测的重要误差源之一。GPS天线周围的建筑物是常见的信号衍射体。针对在变形监测中观测环境相对固定之特点,提出一种基于环境模型的衍射误差建模算法。若干试验表明所提方法能有效检测并削弱衍射误差对变形监测结果的影响。

GPS signal diffractions caused by objects such as building structures surrounding a GPS antenna can introduce significant errors in applications such as deformation monitoring. This paper presents an approach for modelling and mitigating errors caused by GPS signal diffractions by considering the fact that the geometry relating the GPS satellites, the antenna and objects that diffract GPS signals does not change significantly between sidereal days. Test results show that the proposed method is effective and can significantly reduce GPS diffraction errors.