supported by the National Natural Science Foundation of China(Grant Nos.41704154,41431072,41474146,41644167&41674169);the Zhejiang Provincial Science and Technology Plan Project(Grant No.LGG18F010009);State Oceanic Administration Key Laboratory for Polar Science(Grant No.KP201503);the International Collaboration Supporting Project,and Chinese Arctic and Antarctic Administration(Grant No.IC201608)
The High-frequency over-the-horizon radar ground and sea backscatter echoes can be used to estimate the ionosphere critical frequency, providing the ionosphere states up to thousands of kilometers from the transmitter...