Ionospheric Scintillation Monitoring Using Commercial Single Frequency C/A Code Receivers
Ionospheric Scintillation Monitoring Using Commercial Single Frequency C/A Code Receivers
复制标题
DOI：
--
复制
发表时间：
1993-09
期刊：
影响因子：
--
通讯作者：
A. J. V. Dierendonck;J. Klobuchar;Q. Hua
中科院分区：
文献类型：
--
作者：
A. J. V. Dierendonck;J. Klobuchar;Q. Hua
地球的电离层会对许多无线电应用造成严重的问题：DOD C31和导航系统以及通信、射电天文学和导航等商业应用。它们都可能受到电离层扰动的严重影响。诸如幅度衰落和相位闪烁之类的干扰效应限制了对弱信号进行相干积分的能力。减少信道的有效数据容量的一种解决方案是使用时间交织调制方案，其中数据被重复发送以确保其无差错接收。另一种解决方案是在由于闪烁衰落而预测的信号中断的时间期间使用替代资源。然而，这些预测通常基于月气候学，并且由于地球电离层的可变性和动态性，在特定区域的特定时间内很差。需要一种更实时和局部的解决办法全球定位系统信号为在分散的全球基础上测量闪烁效应提供了一种极好的手段，因为这些信号可以连续获得，并且可以通过电离层的许多点同时进行测量。GPS信号本身也会受到影响，但由于信号的扩频特性，利用GPS接收机通过干扰进行跟踪，通常可以采用相当宽的带宽跟踪环路。然而，存在GPS应用，例如使用集成载波相位测量的测量，其中闪烁可以容易地干扰操作活动[1]。本文介绍了一个小企业IMOvative研究（SBIR）第一阶段的研究和测试的软件修改的商业C/A码接收机执行此功能的结果。其结果是一个低成本的设计，便携式电离层闪烁监测器（ISM）正在开发的后续SBlR第二阶段项目。
The earth’s ionosphere can cause serious problems for many radio applications: DOD C31 and navigation systems and commercial applications such as communications, radio astronomy and navigation. They can all be seriously affected by ionospheric disturbances. Disturbance effects such as amplitude fading and phase scintillation limit the ability to coherently integrate weak signals. One solution, which reduces the effective data capacity of the channel, is the use of time-interleaved modulation schemes in which data is sent repeatedly to ensure its error-free reception. Another solution is to use alternate resources during the times of predicted signal outages due to scintillation fading. However, these predictions are generally based on monthly climatology and are poor for a specific time in a particular region due to the variability and dynamics of the earth’s ionosphere. A more real-time and local solution is required GPS signals provide an excellent means for measuring scintillation effects on a disperse global basis because they are continuously available and can be measured through many points of the ionosphere simultaneously. GPS signals are themselves affected, but because of the spread spectrum properties of the signal, tracking through disturbances with a GPS receiver is usually possible with reasonably wide bandwidth tracking loops. and scintillation parameters can be extracted There are GPS applications, however, such as surveying where integrated carrier phase measurements are used, in which scintillation can easily disrupt operational activities [l]. This paper presents the result of a Small Business IMOvative Research (SBIR) Phase I study and testing of a software-modified commercial C/A code receiver to perform this function. The result is a design of a low-cost, portable Ionospheric Scintillation Monitor (ISM) being developed on a follow-on SBlR Phase II project.