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The sun especially the solar wind have influenced our Earth in many ways, and observing the solar wind is an important method to study the solar-earth environment. Interplanetary Scintillation (IPS) observations are an effective method of monitoring solar wind, forecasting the solar-terrestrial space weather and studying the structures of the long distance compact radio sources. Since the discovery...
The SKA (Square Kilometre Array), being the next-generation largest radio telescope, has now stepped into the pre-construction phase. China has joined this long march since the early 1990s and made significant contributions during this process. In this paper, a brief review of the SKA concept and detailed description of the challenges for the SKA dishes are given. Then two concept designs for the...
This paper investigates sparse channel estimations to improve the performance of passive-phase conjugation (PPC) communications. PPC processing achieves pulse compression for time delayed arrivals at the receiver. This property is used for underwater communications with a reduced computational load. The channel estimation is required by PPC. In multipath channels, the sparse channel estimations can...
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