权益分类	功能权益	普通用户	{{item.name}}会员
{{category.name}}	{{benefitItem.name}}

Development of Precision Time and Frequency Comparison System Using a Broadcasting Satellite

利用广播卫星开发精密时间和频率比较系统

基本信息

批准号：
59850055
负责人：
OGAWA Yasutaka
金额：
$ 3.97万
依托单位：
Hokkaido University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Developmental Scientific Research
财政年份：
1984
资助国家：
日本
起止时间：
1984 至 1986
项目状态：
已结题

项目摘要

We may compare time and frequency precisely over long distance by using a synchronization pulse and color subcarrier in a television signal. The purpose of this research was to realize precision time and frequency comparison by means of a satellite broadcasting television signal. We obtained the following results.1. Time comparison was carried out between Hokkaido University ( Sapporo ) and the Radio Research Laboratories, Ministry of Posts and Telecommunications ( Tokyo ) using the broadcasting satellite BS-2a. We corrected the delay time difference of both measurement systems. Furthermore, we corrected the difference of propagation delay time from the broadcasting satellite using predicted orbital data. Then, it was shown that the accuracy of about 0.1 <micro> sec is achieved by the broadcasting satellite. It was also shown that if we use the same measurement system in both of the receiving points, the precision of about 10nsec is realized.2. Frequency comparison was carried out between Hokkaido University and Kagoshima University ( Kagoshima ) using the broadcasting satellite BS-2a. The Doppler shift arises because the broadcasting satellite drifts around the geostationary orbit. The Doppler shift values are different in Sapporo and Kagoshima. Then, the frequency comparison error ( df/f ) amounts to a few parts in <10^(10)> due to the residual Doppler shift. However, it was shown that if we correct the measured results using the predicted orbital data of the broadcasting satellite, the error is in the order of <10^(-11)> .3. This comparison method is realized by inexpensive satellite broadcasting receiving sets and simple pulse and subcarrier extractors. Then, it may be said that the method is advantageous from the view point of economy and widespread availability.

我们可以利用电视信号中的同步脉冲和彩色副载波，在远距离上精确地比较时间和频率。本研究的目的是利用卫星广播电视信号实现精确的时频比较。我们得到了以下结果。使用广播卫星BS-2a对北海道大学（札幌）和邮电部无线电研究实验室（东京）进行了时间比较。对两种测量系统的延迟时间差进行了校正。在此基础上，利用预测轨道数据对广播卫星的传播时延进行了校正。结果表明，广播卫星可达到0.1 <微>秒左右的精度。实验还表明，如果在两个接收点使用相同的测量系统，可以实现约10nsec的精度。利用广播卫星BS-2a对北海道大学和鹿儿岛大学（Kagoshima）进行频率比较。多普勒频移是由于广播卫星绕地球静止轨道漂移而产生的。札幌和鹿儿岛的多普勒频移值不同。然后，由于残余多普勒频移，频率比较误差（df/f）在<10^(10)>的几个部分。结果表明，利用广播卫星轨道预测数据对实测结果进行校正，误差在<10^(-11)>.3量级。这种比较方法是通过廉价的卫星广播接收机和简单的脉冲和副载波提取器实现的。因此，从经济和广泛可用的角度来看，可以说该方法是有利的。