STU BASIC INFORMATION
SYSTEM OVERVIEW
The Lat-Lon Solar Tracking Unit (STU) is a wireless data system that monitors several
parameters on a trailer, railcar, locomotive or any other equipment including GPS data, and
sends that data from most any location world wide to Lat-Lon’s database and website. The
radio communicates via the GSM digital cellular network. The STU is configured to
transmit on a near real-time basis.
Notes on GPS: GPS receivers such as the STU use the GPS satellite system to get their
latitude and longitude (position) as well as exact time. GPS satellites transmit data to GPS
receivers on earth. GPS satellites do not receive any information from GPS receivers. GPS
receivers must have a clear, unobstructed view of the sky in order to see satellites to get
location and time information. Satellites must be in “line of site” of the unit. Nearby
obstructions like buildings and trees or tunnels can obstruct the sky view and degrade or
prevent GPS reception.
Cell
Communications
Network
GPS
Satellites
STU
Equipped
Trailer
Customer
Lat-Lon’s
Internet Data
Servers
