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8 - Positioning with data link: from AGPS1 to RTK

from Part III - Mobile positioning at present and in the future

Published online by Cambridge University Press:  05 May 2014

Ivan G. Petrovski
Ivan G. Petrovski
Affiliation:
iP-Solutions, Tokyo
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Summary

Merging mobile and geodetic technologies

Positioning with data link is not the same as referenced positioning (a method that allows measurements from more than one receiver to be combined and processed together in order to enhance accuracy), which we have discussed in Chapter 4. In this chapter, we consider all possible external information that can be used to enhance receiver specification. This external information includes measurements from other receivers, but it also includes other information which can be used to improve not only accuracy, but also other parameters in the specification, such as TTFF and sensitivity.

It is very important for many applications to be able to provide instant positioning, i.e. to avoid the necessity of tracking a satellite signal and reading a navigation message. It takes up to 36 s to read a complete navigation message for a GPS L1 signal to ensure the decoding necessary for positioning data. If navigation message data are available through some other data link, it is still necessary to decode a time mark from the navigation message, which may require up to 6 s. BGPS (and AGPS before that) are very important for many applications because they allow instant positioning using just a snapshot of data.

Type
Chapter
Information
GPS, GLONASS, Galileo, and BeiDou for Mobile Devices
From Instant to Precise Positioning
 , pp. 207 - 237
Publisher: Cambridge University Press
Print publication year: 2014

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References

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