How soon should a GNSS user submit his/her observations to OPUS-RS for processing?
Roughly speaking, OPUS-RS should provide reasonably accurate coordinates for data-collection points located in the 48 coterminous states if the user waits at least 2 hours after the completion of his/her GNSS observing session before submitting the collected data to OPUS-RS for processing. OPUS-RS may provide more accurate coordinates, if the user waits longer to submit their data. Little or no increase in accuracy should be obtained by waiting more than 28 hours. More precisely speaking, to process a submitted GNSS dataset, OPUS-RS needs (1) corresponding GNSS data from at least three CORS and (2) corresponding GNSS satellite orbits. Moreover, OPUS-RS uses CORS data that spans a time interval which extends the time span of the user’s data by as much as 26.4 minutes in each direction. OPUS-RS uses this extra span of data to accurately estimate atmospheric parameters that characterize the refraction delays experienced by the user’s GNSS data. Now, most CORS data are collected hourly wit
