A NEW METHOD FOR PREDICTING TROPOSPHERIC RANGE ERROR

Based on the quasi-measured values of tropospheric refraction,the relation betweenand △R as expressed in Eq.(3)is proved,and according to the stable feature of refractivityat 9 km above sea level,a simplified method for predicting tropospheric range error is analysed.Some new parameters for linear regression analysis of tropospheric range error are given also.     

一种数字式自动增益控制系统的统计分析

本文介绍了一种数字式相关接收机自动增益控制系统,文中分析了环路的性能,并推导了决定灵敏度和其它性能指标的公式,还给出了一些例子的静态和动态特性,本文还讨论了设计这类自动增益控制系统的主要步骤。     

综合孔径射电望远镜的实时数据采集系统和二维傅里叶变换硬件

本文描述了为密云米波综合孔径射电望远镜研制的两项专用设备:数据采集系统和二维傅里叶变换硬件以及用它们与联机计算机(NOVA-3/D)一起进行的射电望远镜的实时数据采集和处理。此两设备已于1980年初研制成功,实际运行证明,工作正常,能满足需要。     

Measurement of ionospheric large-scale irregularity

Based on the observations of a meter-wave aperture synthesis radio telescope,as the scale length of ionospheric irregularity is greatly larger than the baseline length of interferometer,the phase error induced by the output signal of interferometer due to ionosphere is proportional to the baseline length and accordingly the expressions for extracting the information about ionosphere are derived.By using the ray theory and considering that the antenna is always tracking to the radio source in astronomical observation,the wave motion expression of traveling ionospheric disturbance observed in the total electron content is also derived,which is consistent with that obtained from the conception of thin-phase screen;then the Doppler velocity due to antenna tracking is introduced.Finally the inversion analysis for the horizontal phase velocity of TID from observed data is given.     

预报对流层距离误差的新方法

基于对流层折射的准实测值,讨论了指数大气模型的合理性。根据9km高空折射率值的稳定性,总结出一种预报距离误差的简易方法;并从理论和实测上,讨论并验证了该法的精度。此外,还给出了统计回归折射误差的新参量并验证了它的有效性,特别是对距离误差的改进。     

THE ANALYSIS OF A DIGITAL GAIN CONTROL LOOP

In this paper,an auto-gain-control(AGC)loop which operates in a digital correlating receiveris described.The properties of the loop is analyzed mathematically and the formulas to determinethe sensibility and other parameters are derived.The static and dynamic features of some examplesare shown.The procedure for designing such a gain control loop is discussed.