SARA-G3 and SARA-U2 series - System Integration Manual
UBX-13000995 - R08
Objective Specification
System description
Page 75 of 188
1.13.12
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.
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. SARA-G340, SARA-G350 and SARA-U2 modules 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)
2.
CellLocate
TM
server defines the area of Cell A visibility
