论文部分内容阅读
一、引言通常用无线电干涉仪测角方法测定卫星的轨道;而测量宇宙飞行器所用测距和测速方法则要在被测飞行器上装有应答器。本文介绍一种新型干涉仪。要测定卫星在空间的方位,干涉仪至少要有三个天线。根据同一电磁波波前到达三个天线的时间不同,可以得出两个时延差,然后将此二时延差换算成几何角度值。由图1可看出,干涉仪天线基线长度越大,则时延差也越大。在射电天文学中,利用这一原理制成了基线长度为数千个波长的干涉仪。
I. INTRODUCTION The orbit of a satellite is usually measured by the radio interferometer goniometry method. The measurement and speed measurement method used for measuring the spacecraft must include a transponder on the aircraft under test. This article describes a new type of interferometer. To determine the satellite’s position in space, the interferometer must have at least three antennas. According to the same electromagnetic wave arrives at the three antennas before the time difference, we can draw two delay difference, and then the two delay difference is converted into a geometric angle value. As can be seen from Figure 1, the longer the baseline length of the interferometer antenna, the greater the delay difference. In radio astronomy, this principle is used to make interferometers with a baseline length of thousands of wavelengths.