Data Dictionary A term used to describe the schema, or structure, that defines the relationship between features and their descriptive attributes that will be located in the field with a professional GPS receive. Reference data is typically acquired via direct download from the Internet. CORS (Continuously Operating Reference) Station A network of GPS base stations coordinated by the National Geodetic Survey for the purpose of providing GPS reference data to permit end users to perform post-processed differential correction of GPS data collected with roving receivers. Specifically, the difference between the pseudorandom number code generated by the GPS rover software and the pseudorandom number code coming in from the satellite is used to quickly compute the distance to a satellite and therefore calculate your position. Coarse/Acquisition (C/A) Code A pseudorandom noise code (PRN) modulated onto a L1 signal which helps the GPS receiver to compute the distance from each satellite. Carrier Phase The difference between the carrier signal generated by the internal oscillator of a roving GPS receiver and the carrier signal emitted from a particular GPS satellite. A base station can be a permanent installation that collects base data for provision to multiple users, or a rover unit that you temporarily locate on known coordinates for the duration of a specific project or datalogging session. Base data needs to be collected at the same time as you collect data with a GPS rover unit. Base station A base station is comprised of a GPS antenna and receiver positioned on a known location specifically to collect data for differential correction. Autonomous positions are generally accurate to within 10 meters. The position fix is calculated in real time from satellite data alone. Phone: 51 Fax: 51 Glossary of GPS Terminology Autonomous Positioning The least precise form of positioning that a GPS receiver can produce.
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