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Global
Tracking Technologies solutions comprise the following
technologies:
GPS
Global
positioning system (GPS) consists of 24 operational
satellites in six circular orbits that lie in
non-synchronous orbits at inclinations of 55 degrees,
20,200 km above the earth. There are currently
two 'public' GPS systems. The NAVSTAR system is
owned by the United States and is managed by the
Department of Defence. The Russian Federation
owns the GLONASS system.
The GPS satellites are used to calculate the position
of a GPS receiver on or above the surface of the
earth by applying simple geometry, together with
computing algorithms that assist the receiver
in determining which satellites to use, thereby
resolving any ambiguity related to location.
AGPS
Assisted
GPS (AGPS) GPS requires a host of complex calculations
before determining the latitude and longitude
of the user. In AGPS solution, the network provides
the handset with additional bits of data that
allow the handset to lock onto satellites with
greater alacrity, meaning that it is presumed
to be the most accurate of all PDTs.
GSM / CDMA / UMTS / TDMA
Global
Standard for Mobiles (GSM); GSM is the name of
a land mobile International digital cellular radiocommunications
system;
Code Division Multiple Access (CDMA); CDMA is
one of several "spread spectrum" techniques.
CDMA offers improvements over analogue transmission
in the areas of reduced call dropping, battery
power conservation, more secure transmission and
increased service options.
Universal Mobile Telephone System (UMTS): Third
generation telecommunications system based on
WCDMA-DS.
Time Division Multiple Access (TDMA): a digital
wireless telephony transmission technique. TDMA
allocates each user a different time slot on a
given frequency. GSM, D-AMPS, PDC and DECT use
TDMA in one form or another. 2. A name generally
used for D-AMPS. TDMA networks are operated in
the US, Latin America, New Zealand, parts of Russia
and Asia Pacific. D-AMPS, GSM, PDC, AMPS
EOTD
Enhanced
observed time difference (EOTD) is a time difference
of arrival technology solution that measures the
apparent time differences and received time of
signals transmitted from the network to the handset.
A fair amount of calculation happens in the handset
that needs to detect and measure the time of arrival
data from three sites. This technology is fairly
accurate and for digital GSM operators, the network
infrastructure as well as handset upgrade cost
is minimal.
RF-ID
Radio
frequency identification (RFID). RFID tags are
small integrated circuits connected to an antenna,
which can respond to an interrogating RF signal
with simple identifying information, or with more
complex signals depending on the size of the IC.
Rolltronics' technology can produce thin, small
and durable RFIDs in a cost-effective process.
WIFI
Wireless
Fidelity (WIFI) - Otherwise known as Wireless
Networking, commonly using the 802.11b and g protocol.
TCP/IP
Transmission
Control Protocol/Internet Protocol (TCP/IP): the
suite of communications protocols used to connect
hosts on the Internet.
INMARSAT / SATCOMS
International
Maritime Satellite Organization (INMARSAT) - An
organization created to manage and distribute
naval, aeronautical, and mobile land Satellite
telecommunications.
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