地基单站GPS探测大气折射环境

基于地基单站双频GPS接收机,提出了实时遥感探测大气折射环境（包括对流层折射率剖面与电离层电子密度剖面）的方法,并经过实验验证可行。在对流层方面,改进精密单点定位技术使得对流层低仰角斜延迟可以实时解算,然后利用相关向量机方法反演得到对流层折射率剖面;在电离层方面,采用Kalman滤波技术消除硬件延迟得到电离层TEC,基于IRI模型,利用遗传算法反演得到电离层电子密度剖面。此研究为大气折射环境的实时、高效、低成本探测提供了一种新手段。

Retrieving Atmospheric Refractive Environment by Singular Ground-based GPS Receiver

A technique for retrieving atmospheric refractive environments（including profiles of refractivity in troposphere and electron density in ionosphere） in real time is proposed based on a singular ground-based dual-frequency GPS receiver,and its feasibility is verified by experiments.To retrieve refractivity profiles of troposphere,the precise point position method is improved to obtain tropospheric delay at low elevation（〈5°） in real time,and the relevance vector machine method is used to obtain tropospheric profiles of refractivity.To retrieve electron density profiles in ionosphere,the Kalman filter method is used to obtain accurate total electron content by eliminating hardware delay.Then,the electron density profiles are obtained by a generation algorithm based on IRI model.The study in this paper proposes a new method to retrieve atmospheric refractive environment in real time and at low cost and high efficiency.