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短波广播电波传播距离测量系统。该系统测量了从澳大利亚到日本的高频广播无线电波穿过磁赤道的传播时间，以获得传播距离。用高频测向仪同时测量了电波的入射角。通过同时测量跨赤道高频电波传播的距离和到达角，可以更准确地估计等离子体气泡的位置，并建立有效的广域等离子体气泡监测系统。

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.