A three-station network of HF Doppler measurements augmented with a single rapid-run ionosonde is used at Wuhan Ionospheric Observatory, China, to monitor the atmosphericgravity wave disturbances during the WAGS campa...A three-station network of HF Doppler measurements augmented with a single rapid-run ionosonde is used at Wuhan Ionospheric Observatory, China, to monitor the atmosphericgravity wave disturbances during the WAGS campaign. The records observed in the daytimeon October 18, 1985 (in Incoherent Scatter World Day Run) are investigated. It is found thatthere exist two wave trains of disturbances in the daytime: one is a medium-scale internalgravity wave excited locally and the other is a large-scale guided gravity wave propagatingfrom north to south. Both the horizontal propagation and the height variation of the gravitywave disturbances are studied in detail with a new inversion method. The results indicatethat the inversion method makes the simple HF radio experiment system very useful in thestudy of large scale ionospheric disturbances such as gravity waves.展开更多
根据返回散射电离层回波特性,提出了基于Capon波束形成、对角加载以及加窗技术的返回散射回波DOA(Direction Of Arrival)估计的方法.利用“L”型短波二维天线接收阵列实现了返回散射电离层回波到达角的探测,获得频率-群路径-回波仰角电...根据返回散射电离层回波特性,提出了基于Capon波束形成、对角加载以及加窗技术的返回散射回波DOA(Direction Of Arrival)估计的方法.利用“L”型短波二维天线接收阵列实现了返回散射电离层回波到达角的探测,获得频率-群路径-回波仰角电离图,收发站的直达波信号和准垂测信号的DOA估计结果验证了探测系统的准确性.展开更多
基金Proect supported in part by the National Natural Science Foundation of China.
文摘A three-station network of HF Doppler measurements augmented with a single rapid-run ionosonde is used at Wuhan Ionospheric Observatory, China, to monitor the atmosphericgravity wave disturbances during the WAGS campaign. The records observed in the daytimeon October 18, 1985 (in Incoherent Scatter World Day Run) are investigated. It is found thatthere exist two wave trains of disturbances in the daytime: one is a medium-scale internalgravity wave excited locally and the other is a large-scale guided gravity wave propagatingfrom north to south. Both the horizontal propagation and the height variation of the gravitywave disturbances are studied in detail with a new inversion method. The results indicatethat the inversion method makes the simple HF radio experiment system very useful in thestudy of large scale ionospheric disturbances such as gravity waves.
文摘根据返回散射电离层回波特性,提出了基于Capon波束形成、对角加载以及加窗技术的返回散射回波DOA(Direction Of Arrival)估计的方法.利用“L”型短波二维天线接收阵列实现了返回散射电离层回波到达角的探测,获得频率-群路径-回波仰角电离图,收发站的直达波信号和准垂测信号的DOA估计结果验证了探测系统的准确性.
