摘要
天线相位中心是GPS接收机测量时的参考点。相位中心并不是固定的,它会随不同的信号入射方向发生移动,移动幅度达几个毫米甚至几厘米。相位中心的变化直接影响GPS伪距和载波相位观测量的测量。为了更好地满足一些高精度测量的需要,相位中心的变化量在解算时必须考虑进去。本文对相位中心定义进行了解释,对GPS相位中心及其稳定性进行了分析,并对GPS天线相位中心的测量方法进行了阐述。对自主研制的双频GPS天线相位中心进行了测定,得出相位中心随俯仰角变化的曲线。
Antenna phase center is the reference point when using GPS receiver to navigate and measure. The antenna phase center is not always stable. Its coordinates will change with the variation of the GPS signal directions. The range of coordinates change is from several millimeters to several centimeters. The variation of antenna phase center affects the measurement of carrier phase and C/A code directly. To fit some high accuracy required measure, the phase center variations must be taken into account. This article explains the definition of phase center, analyses GPS antenna phase center and its stability, and presents a method for measuring GPS antenna phase center. The dual-frequency GPS antenna that designed and manufactured by us was tested. The graph of phase center variations with elevations is shown.
出处
《全球定位系统》
2008年第2期6-8,12,共4页
Gnss World of China
