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Regional Positioning System Using TV Signals from Broodcasting Satellites

使用广播卫星电视信号的区域定位系统

基本信息

批准号：
07555308
负责人：
YASUDA Akio
金额：
$ 1.66万
依托单位：
Tokyo University of Mercantile Marine
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (A)
财政年份：
1995
资助国家：
日本
起止时间：
1995 至 1997
项目状态：
已结题

项目摘要

A domestic positioning system using geostationary satellites in Japan has been propose by the present authors. It was proved that high accurate positioning was possible, though the post processing, by exploiting TV synchronous signals transmitted from broadcasting satellites for range measurement. In order to attain a real-time positioning at mobile stations, the satellite position information must be sent to users. The authors tried to use a communication satellite to transmit them. At the same time, they also tried to use the communication satellite as a transmitter for positioning as well. Thus, it is necessary to obtain the exact position of the satellite. They tried to establish a system to monitor and transmit the position of communication satellite by VSAT (Very Small Aperture Terminal) for real-time positioning. A 31- bit m- sequence signal of 64 kHz was used as a range finding signal to the geostationary communication satellite JCSAT-1 at 150 E.In the proposed system, the satellites position was deduced from three ranges between the satellite and three VSAT earth stations. They were measured at the master station by switching the reception frequency to receive range finding signals sent back from the satellite directly and the two slave stations through the satellite. The measured absolute ranges at the master station agree well with the values simultaneously measured at the satellite control center and have the standard deviation of 2m.We tried the positioning with three geostationary satellites, namely BS at 110ﾟE,CS at 162ﾟE,and JCSAT at 150ﾟE in the third year. The technique, developed in the first two years was used. The deduced points, of which the 2 drms is 72 m, by the present positioning method scattered widely in the latitudinal direction as the components of the covariance matrix, which is deduced from the satellites allocation, imply.

本文作者提出了利用日本的地球同步卫星进行国内定位的设想。利用广播卫星发射的电视同步信号进行测距，经过后处理，证明了高精度定位是可能的。为了在移动台上实现实时定位，必须将卫星位置信息发送给用户。作者试图使用通信卫星将它们传送出去。同时，他们还尝试利用通信卫星作为定位的发射机。因此，有必要获得卫星的准确位置。他们试图建立一个系统，通过VSAT(甚小口径终端)监测和传输通信卫星的位置，以便进行实时定位。该系统利用31比特的kHzm序列信号作为测距信号提供给地球静止通信卫星JCSAT-1，测距时间为150E。它们是在主站通过切换接收频率来测量的，以接收直接从卫星和两个从站通过卫星发回的测距信号。主站测量的绝对距离与卫星控制中心同时测量的绝对距离值吻合较好，标准偏差为2m。第三年，我们尝试了三颗地球同步卫星定位，即BS在110ﾟE，CS在162ﾟE，JCSAT在150ﾟE。这项在头两年开发的技术被使用了。目前的定位方法所推导出的两个DRMS为72m的点，作为卫星配置得到的协方差矩阵的分量，在纬度方向上散布很广。