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Antenna Guide for ISR and CGR with Verizon Wireless 4G LTE
ISR LTE GPS Overview
The Global Positioning System (GPS) is a U.S.-owned utility that provides users/devices with positioning, navigation,
and timing services. This system consists of three domains, or “segments”: the space segment, the control segment,
and the user segment. The U.S. Air Force develops, maintains, and operates the space and control segments.
The space segment consists of 24 satellites that transmit their position and the time. The control segment consists of
a management system to monitor and control the satellites, for example keeping them in the appropriate orbits. The
user segment consists of a GPS receiver (separate device, or a function in a multi-function device) that receives the
information from multiple satellites and calculates its 3-dimensional position on Earth. A Cisco ISR with LTE interface
can be a GPS receiver (requires IOS 15.3(3)M2 or later M release. GPS can be built using different technologies.
Satellite GPS
A passive GPS via the satellite system is where a device receives signal from 3 or more Satellites to derive its
location.
Active GPS
This general term often denotes that a device’s satellite GPS receiver is amplified, or powered, to better receive signal.
Assisted GPS
This technique allows a GPS receiver to more quickly obtain its coordinates by providing the device information to
better obtain satellite location (orbital info, to lock into satellites faster) and assisting in calculation based on incomplete
information from the receiver (provides for more computing/calculating power and better knowledge of satellite
position). Assisted GPS therefore requires two-way communications to the GPS receiver and an IP data path.
Cell Tower Triangulation
Location based services can be a feature provided from cellular wireless networks. It is based upon radio signal
strength to/from a device relative to multiple cell towers. By comparing the signal strength between the LTE device
and multiple cell towers, an approximate distance from each and thus location is derived based on the intersection.
Although called Triangulation, the comparison for location may be to 2, 3, 4 or more cell towers.
Both systems provide significant benefits, and can be used together, or separately. The key to leveraging GPS is in
having an application or service that correlates the data into meaningful information.
The Cisco ISR with EHWIC-4G-LTE-V, C819G-4G-V, and CGR2010 with GRWIC-4G-LTE-V, all provide GPS
coordinates via satellite, using active GPS. The ISR or CGR today do not currently support cell tower triangulation.
For satellite GPS, what is needed is a GPS antenna and simple IOS configuration.
and timing services. This system consists of three domains, or “segments”: the space segment, the control segment,
and the user segment. The U.S. Air Force develops, maintains, and operates the space and control segments.
The space segment consists of 24 satellites that transmit their position and the time. The control segment consists of
a management system to monitor and control the satellites, for example keeping them in the appropriate orbits. The
user segment consists of a GPS receiver (separate device, or a function in a multi-function device) that receives the
information from multiple satellites and calculates its 3-dimensional position on Earth. A Cisco ISR with LTE interface
can be a GPS receiver (requires IOS 15.3(3)M2 or later M release. GPS can be built using different technologies.
Satellite GPS
A passive GPS via the satellite system is where a device receives signal from 3 or more Satellites to derive its
location.
Active GPS
This general term often denotes that a device’s satellite GPS receiver is amplified, or powered, to better receive signal.
Assisted GPS
This technique allows a GPS receiver to more quickly obtain its coordinates by providing the device information to
better obtain satellite location (orbital info, to lock into satellites faster) and assisting in calculation based on incomplete
information from the receiver (provides for more computing/calculating power and better knowledge of satellite
position). Assisted GPS therefore requires two-way communications to the GPS receiver and an IP data path.
Cell Tower Triangulation
Location based services can be a feature provided from cellular wireless networks. It is based upon radio signal
strength to/from a device relative to multiple cell towers. By comparing the signal strength between the LTE device
and multiple cell towers, an approximate distance from each and thus location is derived based on the intersection.
Although called Triangulation, the comparison for location may be to 2, 3, 4 or more cell towers.
Both systems provide significant benefits, and can be used together, or separately. The key to leveraging GPS is in
having an application or service that correlates the data into meaningful information.
The Cisco ISR with EHWIC-4G-LTE-V, C819G-4G-V, and CGR2010 with GRWIC-4G-LTE-V, all provide GPS
coordinates via satellite, using active GPS. The ISR or CGR today do not currently support cell tower triangulation.
For satellite GPS, what is needed is a GPS antenna and simple IOS configuration.
GPS
Cell Tower Triangulation