Studies on meteor burst communications in Antarctica

2001年12月在南极洲昭和中山考察站建成了两个流星群通信站。这些台站于2002年4月正式开始试验。实验分为两部分：（1）单音实验，从中山台发射单音信号，在昭和台接收单音信号，研究低VHF无线电波在该地区的BLOS传播质量和统计特性;以及2）数据实验，其中数据包在Zhong-用MCC公司的设备将掸邦远站数据传输到昭和主站，进行了2.5年的音频实验，这次数据实验持续了9个月。2003年4月至12月，在昭和主站与中山和Dome-Fuji两个远程站之间，利用MCC设备进行了另一次数据试验。此外，使用RANDOM（我们使用软件调制解调器开发的新NBC系统）的第三次数据实验在Apri进行 ...更多信息 l 2004年至同年11月，昭和站和中山站之间。所有的实验都是成功的，结果通过电子邮件邮寄到我们的实验室。从第一次数据分析中得出了许多有趣的结论。其中包括：1）在南极地区存在占空比为百分之几的米波突发信道。2）占空比几乎为100%的非流星传播，可能与极光活动有关，特别是在当地夜间，经常占主导地位。3)这种来自非流星传播的大占空比对于数据传输是有用的，因为它在大多数时间没有严重的多普勒频移和衰落。4)Dome-Fuji和Syowa之间的信道比中山和Syowa信道具有更低的占空比和更小的数据吞吐量。5)RANDOM系统的容量是MCC系统的两到三倍。我们还在滨松主站和宫崎远站之间使用相同的设备和相同的设置进行数据和音调实验。少

Two meteor burst communication (MBC) stations are constructed at Syowa and Zhong-Shan research stations in Antarctica in December 2001. The stations started experiments in due form in April 2002. The experiments consist of two parts ; 1)Tone experimentin which a tone signal is transmitted from Zhong-Shan station and received at Syowa station to study the quality and statistics of the BLOS propagation of low VHF radio waves in this region, and 2)Data experiment in which data packets generated at Zhong-Shan remote station is transmitted to Syowa master station using equipment made by MCC Co. The tone experiment was continued 2.5 years and this data experiments lasted 9 months. Another data experiment by MCC equipment was conducted from April to December of 2003 between Syowa master station and two remote stations at Zhong-Shan and Dome-Fuji remote stations. Furthermore the third data experiment using RANDOM (a new NBC system developed by us using a software modem) was conducted from Apri … More l 2004 to November of the year between Syowa and Zhong-Shan stations. All the experiments were sueoeseful and the results were mailed to our laboratory via e-mails. Many interesting conclusions are obtained from the first analysis of the data. Some of them are ; 1)There exist meter burst channels having a few % channel duty cycle in the Antarctic region. 2)Non-meteoric propagation with almost 100% duty cycle which might be related to aurora activity frequently dominates the channel especially in local night hours. 3)This large duty cycle which comes from the non-meteoric propagation is useful for data transmission because it is free from severe Doppler shifts and fading most of the time. 4)The channel between Dome-Fuji and Syowa has lower duty cycle and smaller data throughput than the Zhong-Shan and Syowa channel. 5)The capacity of RANDOM system is two or three times larger than that of MCC system. We are also conducting data and tone experiments with the same kind of equipment and the same setting between Hamamatsu master station and Miyazaki remote station. Less