Low cost, high accuracy, GNSS survey and mapping
Sass, Joe
Global Navigation Satellite Systems (GNSS) use has dramatically increased over the last decade. GNSS receivers are reliable, effective and highly productive tools for determining precise position and time. The primary GNSS today is the United Statess Global Positioning System (GPS). These satellites broadcast two L-band radio frequencies commonly known as L1 and L2. The dualfrequency GNSS receivers on the market today are very expensive, but they have been considered necessary to be productive in many situations. A major consideration in the productivity equation has been the ability of dual-frequency receivers to perform GNSS surveys and get immediate results. This possibility to perform Real-Time Kinematic (RTK) surveys had been the strict domain of dual-frequency receivers until techniques were developed that could utilize multiple satellite systems such as the GPS+GLONASSS (Kozlov, 1998) L1 technology introduced in the late 19900s. Historically, single-frequency, GPS-only RTK has been considered impractical due to the longer Time To First Fix (TTFF) which can range from a few seconds with dual-frequency to several minutes with singlefrequency systems.
Event: 6th FIG Regional Conference 2007 : Strategic Integration of Surveying Services
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