关键词: 短波通信试验;南极长城站;新乡站;传播方位

Abstract:

In the paper first persented are the results of the SW- communication experiment including received signal quality levels in both stations, available time segments in one day and operational frequency bandwidth, which have been obtained in the compaign of experiment taken from Dec.1985 to Mar.1986.A comparison of the communication frequency bandwidth and the calculated MUF have been made.It is found that the upper limit of the operational frequency bandwidth along the short great circle path which crosses the south-polar, region is approximately in accord with the calculated MUF and the other one along the long great circle path which crosses the north- polar region is different from the calculated MUF. Furthermore, in the paper the results of the bearings measurements taken from Jan.to Feb.1986 are presented in detail.The waves propagated along the great circle path are.of major propagation mode between the Antarctic Great Wall Station and Xinciang Station. But there are some non-great-circle path propagations in certain hours. It is proposed that the resultant non-great-circle path propagation is probably due to the wave scatering effects on , the earth's surface. Intense side lobes of antenna and weak ionospheric absorption help to form the non-great-circle path propagation.