SARA-G3 series - System Integration Manual
UBX-13000995 - R06
Objective Specification
System description
Page 85 of 218
1.13.10
Hybrid positioning and CellLocate
TM
Not supported by SARA-G300 and SARA-G310 versions.
Although GNSS is a widespread technology, reliance on the visibility of extremely weak GNSS satellite
signals means that positioning is not always possible, particularly in shielded environments such as indoors
and enclosed park houses, or when a GNSS jamming signal is present. The situation can be improved by
augmenting GNSS receiver data with network cell information to provide a level of redundancy that can
benefit numerous applications.
1.13.10.1
Positioning through cellular information: CellLocate
TM
u-blox CellLocate
TM
enables the device position estimation based on the parameters of the mobile network
cells visible to the specific device. To estimate its position the module sends the CellLocate
TM
server the
parameters of network cells visible to it using a UDP connection. In return the server provides the
estimated position based on the CellLocate
TM
database. The SARA-G350 module can either send the
parameters of the visible home network cells only (normal scan) or the parameters of all surrounding
cells of all mobile operators (deep scan).
The CellLocate
TM
database is compiled from the position of devices which observed, in the past, a specific
cell or set of cells (historical observations) as follows:
1.
Several devices reported their position to the CellLocate server when observing a specific cell (the As
in the picture represent the position of the devices which observed the same cell A)
