Velocity

2014

NovAtel's Annual Journal of GNSS Technology Solutions and Innovation

Issue link: http://velocitymagazine.epubxp.com/i/380251

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novatel correct velocity 2014 For more Solutions visit http://www.novatel.com 22 full convergence. In NovAtel CORRECT with TerraStar PPP, however, the ionosphere effects are estimated within the filter. This informa- tion is then propagated past the signal inter- ruption, and used as additional information to aid the re-convergence. Figure 7 shows how these ionosphere constraints can improve re- convergence following a 10-second complete signal interruption. What You Need, When You Need It Employing satellite-based delivery of data en- sures that the corrections are available in remote areas, where other telecommunications infra- structure is not available. For example, agricultural sites are typical- ly very large. Using RTK-based methods for machine guidance in remote locations might require more than one base station, which adds cost and logistical complexity. NovAtel CORRECT with TerraStar provides decime- tre or better accuracy at a more cost-effective price point than more conventional, logisti- cally complex base station solutions. As well, delivery over L-Band satellite means any user who can see the satellite has access to the corrections (between 70 degrees north and 70 degrees south). Using satellite-based delivery ensures higher reliability of the service and makes subscribing and using the service easier for end-users. Perhaps one of the greatest benefits of the NovAtel CORRECT with TerraStar service is subscription f lexibility. A range of PPP ser- vices are available through NovAtel to suit any customer's business model. Why pay for centimetre positioning if all you need is deci- metre accuracy? Why pay for a full year sub- scription if you only need decimetre accuracy for three months? With NovAtel® in control of the entire posi- tioning solution, future innovation—including seamless integration with all positioning modes and correction types—is assured. figure 5: Horizontal errors over 1 week figure 6: Horizontal error cumulative sum percentage. figure 7: Horizontal re-convergence improvement with constrained ionosphere Horizontal 68% NomiNal ioNosphere-coNstraiNed Horizontal 68%

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