O'Reilly logo

Mobile Location Services: The Definitive Guide by Andrew Jagoe

Stay ahead with the world's most comprehensive technology and business learning platform.

With Safari, you learn the way you learn best. Get unlimited access to videos, live online training, learning paths, books, tutorials, and more.

Start Free Trial

No credit card required

Enhanced-Observed Time Difference

Enhanced-observed time difference (E-OTD) is similar to time difference of arrival (TDOA), but is a handset-based positioning solution rather than a network-based solution. E-OTD takes the data received from the surrounding base stations to measure the difference in time it takes for the data to reach the terminal (see Figure 5.7). The time difference is used to calculate where the mobile device is in relation to the base stations. For this to work, the location of the base stations must be known and the data sent from the different base stations must be synchronized.

Figure 5.7. E-OTD.

Base stations are typically ...

With Safari, you learn the way you learn best. Get unlimited access to videos, live online training, learning paths, books, interactive tutorials, and more.

Start Free Trial

No credit card required