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Authors
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Funding
Funding for this research was provided by:
the National Key R&D Program of China (2018YFC1505102)
Special Fund for Technological Innovation Guidance of Shaanxi Province (2018XNCGG05)
the China Postdoctoral Science Foundation (2019M662713)
the Grand Projects of the Beidou-2 System (GFZX0301040308)
Fundamental Research Funds for the Central Universities,CHD (300102261713)
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Article History
Received: 26 October 2020
Accepted: 1 February 2021
First Online: 16 February 2021
Compliance with ethical standards
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: The authors declare no conflicts of interest.
