Recent advances in real-time analysis of ionograms and ionospheric drift measurements with digisondes
Recent advances in real-time analysis of ionograms and ionospheric drift measurements with digisondes
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DOI：
10.1016/j.jastp.2005.01.009
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发表时间：
2005-08
影响因子：
1.9
通讯作者：
B. Reinisch;Xueqin Huang;I. Galkin;V. Paznukhov;A. Kozlov
中科院分区：
文献类型：
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作者：
B. Reinisch;Xueqin Huang;I. Galkin;V. Paznukhov;A. Kozlov
可靠的长距离射频通信和跨电离层无线电链路关键取决于空间天气，特别是电离层条件。现代地基电离层探测仪实时提供空间天气参数，包括高达1000公里的垂直电子密度分布和电离层F区漂移的速度分量。全球数字探空仪网络通过互联网连接实时发布这些信息。自首次尝试报告以来，电离图中回波迹线自动定标的质量一直是一个令人关切的问题。现代低功率电离层探测仪配有100瓦的发射机（而老式电离层探测仪只有几千瓦），它依靠更复杂的信号处理来提高信噪比和检索基本的电离层特征。自动定标算法ARTIST的最新进展大大提高了自动定标数据的可靠性，使数据与模型相结合，对电离层即时预报更有用。垂直和水平F区漂移速度是数字式探空仪的新的实时输出。“电离层探测仪漂移”是从测量的电离层反射高频回波的多普勒频移和到达角导出的，这一方法类似于相干VHF和非相干散射雷达所使用的方法。
Reliable long distance RF communication and transionospheric radio links depend critically on space weather, and specifically ionospheric conditions. Modern ground-based ionosondes provide space weather parameters in real-time including the vertical electron density distribution up to ∼1000km and the velocity components of the ionospheric F region drift. A global network of digisondes distributes this information in real-time via internet connections. The quality of the automatic scaling of the echo traces in ionograms was a continuous concern ever since first attempts have been reported. The modern low-power ionosonde with ∼100W transmitters (compared to several kilowatt for the older ionosondes) relies on more sophisticated signal processing to enhance the signal-to-noise ratio and to retrieve the essential ionospheric characteristics. Recent advances in the automatic scaling algorithm ARTIST have significantly increased the reliability of the autoscaled data, making the data, in combination with models, more useful for ionospheric now-casting. Vertical and horizontal F region drift velocities are a new real-time output of the digisondes. The “ionosonde drift” is derived from the measured Doppler frequency shift and angle of arrival of ionospherically reflected HF echoes, a method similar to that used by coherent VHF and incoherent scatter radars.