GLONASSARY

RTK (Real Time Kinematic) – refers to highly-accurate, highly-repeatable positioning. With RTK, a base station receiver is placed on a stable (ideally immobile) mount, allowing multiple GPS rover receivers to utilize this type of correction within a limited range of the base station. The premise behind the service is simple: as the base station continually collects static position information under local field conditions, the positioning errors computed at the base station (the differences between “observed” values and “truth”) are assumed to be the same errors occurring at the mobile receiver (rover). The base-station errors are transmitted to the mobile receiver, usually via a short-range radio or other communication device, allowing the rover unit to use this information to calculate a highly accurate, corrected position. Radios operate best within line of sight or with a repeater. RTK utilizes two dual-frequency receivers---necessary for highly accurate operations, such as precision guidance for row crop production or collecting GPS elevation data for topography mapping. The Alabama Department of Transportation (ALDOT) has established many CORS-rated stations throughout Alabama. They also provide real-time connectivity to each station for customers; the result is an RTK service whereby the customer does not necessarily have to purchase their own base station.

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