摘要
This paper reviews the status of satellite navigation(as per 11 May 2020)-without claim for completeness-and discusses the various global navigation satellite systems,regional satellite navigation systems and satellite-based augmentation systems.Problems and challenges for delivering nowadays a safe and reliable navigation are discussed.New opportunities,perspectives and megatrends of satellite navigation are outlined.Some remarks are closing this paper emphasizing the great value of satellite navigation at present and in future.
