Local multipath or adverse atmospheric conditions may also negatively impact your solution. User errors (such as misidentification of antenna or ARP height) cannot be detected. However, estimating the accuracy for a specific solution is difficultīecause formal error propagation is notoriously optimistic for GPS reductions.
Under normal conditions, most positions can be computed to within a few centimeters. Rapid-static processing has stricter requirements for data continuity and geometry in some remote areas of the country OPUS-RS may not work. Rapid-Static: Files that are 15 minutes to 2 hours in duration are processed using RSGPS rapid-static software.Your coordinates are the average of three independent, single-baseline solutions, each computed by double-differenced carrier-phase measurements from one of three nearby CORSs. Static: Files that are 2 to 48 hours in duration are processed using PAGES static software.Caution! If you choose to set a profile, your selections will override the optimized defaults for all subsequent uploads.ĭepending on the duration of your data file, OPUS will use either static or rapid-static processing:.Subsequent uploads will require only your email and a data file to apply your customized defaults.If you choose to set a profile, OPUS will save your email, antenna type and height, and options used.Choose your State Plane Coordinate System ( SPCS) zone.Select additional options By clicking the 'Options' button, you can: Your OPUS solution will be sent to this address when processing is complete.ĥ. See antenna calibration for a drawing of the ARP for your antenna (usually the center of the base or tripod mount). Enter your ARP heightĮnter the vertical height (in meters) of your Antenna Reference Point ( ARP) above the mark. Choosing an incorrect antenna may result in a height error as large as 80 cm and a horizontal error up to 1 cm. Correctly selecting your antenna will help OPUS apply the appropriate antenna calibration model to counter the unique measurement biases inherent in each antenna's design. To find the correct antenna type, browse antenna calibrations. OPUS accepts all mask angles, but only satellites more than 10° above the horizon are used.OPUS decimates all recording rates to 30 seconds.OPUS only uses GPS observables (even if the file contains other GNSS observables).
For compressed files: all files must share the same antenna type and height
Record data at intervals of 1, 2, 3, 5, 10, 15, or 30 seconds.Files under 2 hours must include both P2 observables and either P1 or C1 observables.Include a minimum of 15 minutes and maximum of 48 hours of data, not crossing UTC midnight more than once.Include static data only (the antenna must remain unmoved throughout the observing session).