NovAtel's Annual Journal of GNSS Technology Solutions and Innovation

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Page 21 of 51

novatel correct velocity 2014 For more Solutions visit 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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