高频返回散射扫频电离图的反演

斜向返回探测可以对遥远地区的电离层进行连续监测,是探测电离层的主要手段之一,一般得到返回功率、群路径或时延与频率之间的关系,称为高频返回散射电离图.由于电离图包含了探测路径上电离层状态信息,可以通过对其反演获得电离层结构参数.本文提出了一种新的反演算法,使用模拟退火方法对返回散射扫频电离图前沿进行了反演,并用实际探测数...

Inversion of HF sweep-frequency backscatter ionograms

The oblique backscatter sounding is a powerful tool for detecting and monitoring the ionosphere continuously at a remote distance. HF backscatter ionograms showing the backscatter amplitude and group path or time delay against operating frequency can be obtained in this way. A backscatter ionogram contains useful information regarding the state of the ionosphere along the propagation paths which can be acquired by inversion algorithm. A new inversion algorithm using simulated annealing is proposed to inverse the leading edge of sweep-frequency ionogram. This algorithm is validated by real data and a two-dimension electron density profile is shown. Statistical result is also presented, and 62.97% of the inversion results accord with the vertical data. The results present that this algorithm can give accurate inversion results rapidly, and instability of traditional algorithm is conquered. The algorithm is practicable in dealing with real data.