应用武汉电离层斜向返回探测系统测量回波相位

Measurement of echo phase by Wuhan ionospheric obliquebackscattering sounding system(WIOBSS)

电离层作为时空随机变化介质,除了规则变化外还存在着不规则结构和随机变化,即电离层不稳定性,其直接影响是经过电离层传播的电波产生相位随机起伏。利用垂测仪和信标接收机测量精确相位数据的各种方法已被广泛应用,而应用具有大范围电离层探测能力的高频天波超视距雷达测量回波相位的方法还没有文献提出。文中提出了一种从相位编码脉冲压缩体制电离层探测雷达测量的电离层信道双时响应中提取相位数据的理论。此理论被成功地应用于自行研制的武汉电离层斜向返回探测系统中,探测获得了有效的回波相位数据。

Ionosphere is a kind of random medium dependent on space-time. Apart from regular variation, the irregular structure and random variation of ionosphere result in ionospheric instability which directly induces phase fluctuation of electromagnetic wave propagating across ionosphere. Various methods for ionosonde and beaconing receiver to measure accurate phase data have been widely applied. However, the measurement of echo phase for large-scale ionosphere by HF sky wave over-the-horizon radar has not been found in other literature. In this paper, a theory for computing phase data from ionospheric bitemporal response measured by the radar using coded pulses and pulse compression is presented, and is successfully applied to the Wuhan ionospheric oblique backscattering sounding system （WIOBSS） developed by ourselves and the effective phase variation data are obtained.