Sources of Errors in GPS observation

Global Navigation Satellite System (GNSS), including GPS, is affected by several sources of errors that impact the accuracy of positioning. These errors can be categorized into satellite-related, atmospheric, receiver-related, and environmental factors.  

Satellite-related errors arise due to inaccuracies in satellite clocks and orbit prediction. Satellite clock errors occur because even highly precise atomic clocks onboard satellites experience slight deviations. Orbital errors, also ___ ___ __________ _____ _______ _____ ______.
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