超高频无线电波经过三维不均匀电离层的折射效应

本文导出超高频无线电波经过三维不均匀电离层折射误差的计算公式。包括无线电波和无线电脉冲的到达角误差,相位延时误差和群延时误差。电离层引起的折射误差展开成1/f的幂级数。由于高级项误差的表示式太复杂,所以本文只给出到第三级效应。考虑到一些跟踪定位系统已经具有修正电离层一级效应的能力,故计算二级、三级效应会有助于估计消除一级效应后的剩余误差。 

REFRACTIVE EFFECTS ON VERY HIGH FREQUENCY RADIO WAVES THROUGH A THREE-DIMENSIONAL INHOMOGENEOUS IONOSPHERE

Ionospheric refraction effects on VHPradio waves play an important role in space technique, such as tracking, navigation, telemetry etc. In theorical range, it has always been supposed that the ionospheric parameters are spherically symmetric except Alpert did in 1963. But Alpert's formulas only contain ionospherically first-order contribution, (ionospherical refraction effects can be expanded as power series in terms of 1/f)In this paper, based on Alpert's work (1963), a new ray diffrencial equations are given aswhere k1=R0 sin ds and ds. From this, it is easy to give expressions of ionospherical refraction effects including higher order ionospheric contribution. In consideration of the complexity of those expressions, only first three order contribution are provided.