Lab GPS OPUS - Lab: GPS OPUS Objectives: 1. To learn how to...

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Lab: GPS OPUS Objectives: 1. To learn how to determine a geodetic location using the OPUS service of NGS. 2. To test the relationship between session length and (a) accuracy, and (b) precision. 3. To test the relationship between the CORS base location and (a) accuracy and (b) precision. Procedure: Three sessions: Set up a dual frequency GPS receiver over a known control point. Occupy this point in static survey mode for three sessions of different lengths: Session 1: 10 minutes, Session 2: 30 minutes, and Session 3: 60 minutes. Download the observation file and export the data in RINEX format using the software provided by the GPS manufacturor. Upload the RINEX file to OPUS. OPUS processing with three groups of CORS base stations: 1. Nearby CORS Stations: First, select THREE NEARBY CORS STATIONS, within 0-25 miles if possible. Have OPUS give the positions in each of your three field sessions as an average from these nearby CORS points. You should have three positions from this processing. 2. Medium Distant CORS Stations:
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Lab GPS OPUS - Lab: GPS OPUS Objectives: 1. To learn how to...

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