Development of wide-area plasma bubble monitoring by a passive radar technique with digital radio receivers

利用无源雷达技术，研制了一种基于数字软件无线电接收机的高频广播无线电波传播距离测量系统。利用该系统测量了从澳大利亚到日本的高频广播无线电波穿越磁赤道的传播时间，得出了传播距离。用高频测向仪同时测量了无线电波的到达角。通过同时测量跨赤道高频无线电波传播距离和到达角，可以实现更精确的等离子体气泡位置估计和有效的等离子体气泡广域辐射监测系统。

A system to measure the propagation distance of HF broadcast radio waves was developed with digital software radio receivers by utilizing a passive radar technique. The propagation time of HF broadcast radio waves from Australia to Japan across the magnetic equator was measured by the system to derive propagation distance. A rrival angle s of the radio waves were measured simultaneously by an HF direction finder. It was suggested that more accurate position estimation of plasma bubbles and an effective wide-ar ea monitoring system of plasma bubbles would be achievable by measuring the distance and arrival angle of trans-equatorial HF radio wave propagation simultaneously.