EX4U GSM 3G & GPS Components and Services
- GSM 3G & GPS units. Please browse our GSM&GPS pages or contact EX4U for advanced specialized security systems.
- Telemetric components.
- Internet based Location & Fleet Management, used to encompass the management of any/all
aspects relating to a company's vehicle fleet from the allocation of resources to fuel
- Vehicle Tracking, this component is usually GPS based, but sometimes it can be based on a Cellular triangulation platform (assisted GPS - AGPS).
EX4U logistics, tracking and
tracing is the concept of locating persons or property that is being forwarded from an
origin to a destination through various hubs and passing along spokes, and
determining the location and other status of such object.
Usually this concept is supported by means of reckoning and reporting of the
position of the vehicles transporting containers with the object in real-time.
This approach leaves the task to compose a coherent depiction of the status
Another approach is to report the arrival or departure of the object and
recording the identification of the object, the location where observed, the
time, and the status, e.g. on damage or loading. This approach leaves the task
to verify the reports regarding consistency and completeness. An example of this
method might be the package tracking provided by shippers, such as Couriers.
Advanced Fleet management systems can connect to the vehicle's onboard computer, and gather data for the user.
Details such as milage, fuel consumption, and much more, are gathered into a
global statistics scheme.
By combining received data from the Vehicle Tracking system and the onboard
computer, it is possible to form a profile for any given driver.
GSM - Global System for Mobile Communications
Circuit Switched Data, often referred to as CSD, is the
original form of data transmission developed
for the TDMA-based mobile phone systems like GSM. CSD uses a single
radio time slot to deliver 9.6 kbit/s data
transmission to the GSM Network and Switching Subsystem where it could be connected through the equivalent of a normal modem to the PSTN allowing direct calls to any dial up service.
|The Global System for Mobile Communications (GSM) is the most
popular standard for mobile phones in the world. GSM service is used by over 2 billion people across
more than 212 countries and territories.
The ubiquity of the GSM standard makes international roaming very common between mobile phone operators, enabling subscribers to use their phones in many parts of the
world. GSM differs significantly from its predecessors in that both signaling
and speech channels are Digital call quality, which means that it
is considered a second generation (2G)
mobile phone system. This fact has also meant that data communication
was built into the system from very early on. GSM is an open standard
which is currently developed by the 3rd Generation Patership Project
A CSD call functions in a very similar way to a normal voice call in a GSM network. A single dedicated radio time slot is allocated between the phone and the base station. A dedicated
"sub-time slot" (16 kbit/s) is allocated from the base station to the transcoder, and finally another
time slot (64 kbit/s) is allocated from the transcoder to the Mobile Switching Centre (MSC).
GSM data transmission has advanced since the introduction of CSD:
General Packet Radio Service (GPRS) is a mobile data service available to users of GSM mobile phones. It is often described as "2.5G", that is, a technology between the second
(2G) and third (3G) generations of mobile telephony. It provides moderate
speed data transfer, by using unused TDMA channels in the GSM network. Originally there was some thought to extend
GPRS to cover other standards, but instead those networks are being converted to
use the GSM standard, so that is the only kind of network where GPRS is in use.
GPRS is integrated into GSM standards releases starting withRelease 97and
onwards. Standardized now by the 3GPP.
- HSCSD is a system based on
CSD but designed to provide higher data rates by means of more efficient
channel coding and/or multiple (up to 4) time slots.
- GPRS provides more efficient
packet-based data transmission directly from the mobile phone at speeds similar
- Finally EDGE (E-GPRS) and UMTS provide
improved radio interfaces with higher data rates, while still being backward
- compatible with the GSM core network.
Universal Mobile Telecommunications System (UMTS) is one of the
third-generation (3G) mobile phone technologies. It
uses W-CDMA as the underlying standard,
is standardized by the 3GPP, and is the
European answer to the ITU IMT-2000 requirements for 3G Cellular radio systems.
UMTS supports up to 1920 kbit/s data transfer rates (and not 2 Mbit/s as frequently seen),
although at the moment users in the real networks can expect performance up to
384 kbit/s - in Japan upgrades to 3 Mbit/s are in preparation. However, this is
still much greater than the 14.4 kbit/s of a single GSM error-corrected circuit
switched data channel or multiple 14.4 kbit/s channels in HSCSD, and - in competition to
other network technologies such as CDMA-2000, PHS or WLAN - offers access to the WWW and
other data services on mobile devices.
Global Positioning System
||The Global Positioning System, usually called GPS, is the only fully-functional satellite navigation system. Officially named NAVSTAR GPS (Navigation Signal
Timing and Ranging Global Positioning
A constellation of more than fifty GPS satellites broadcasts
precise timing signals by radio, allowing any GPS receiver (abbreviated
to GPSr) to accurately determine its location ( longitude, latitude and
altitude) in any weather, day or night, anywhere on Earth.
has become a vital global utility, indispensable for modern navigation
on land, sea, and air around the world, as well as an important tool
for map-making and land-surveying. GPS also provides an extremely precise time reference,
required for telecommunications and some scientific research, including
the study of earthquakes. GPS receivers can also gauge altitude and
speed with a very high degree of accuracy.
Galileo Positioning System
The required satellites, the planned number is 30, will launched throughout the
period 20112014 and the system will be up and running and under civilian
|The Galileo positioning system is a proposed satellite navigation system, to be
built by the European Union (EU) as an alternative to NAVSTAR (which is controlled by the United States military) and the Russian GLONASS. The system should be operational by 2011 to 2014.
It is named after the Italian astronomer Galileo Galilei. The Galileo positioning system
is not to be abbreviated to GPS, which refers specificially to the existing
United States system, but would be referred to as 'Galileo'.
Galileo is intended to provide:
- Greater precision to all users than is currently available.
- Improved coverage of satellite signals at higher latitudes, which northern
regions such as Scandinavia will benefit from.
- A positioning system upon which European nations can rely even in times of war or
There will be four different navigation services available:
- The Open Service (OS) will be free for anyone to access. The
OS signals will be broadcast in two bands, at 11641214 MHz and at 15631591 MHz. Receivers will achieve an
accuracy of <4 m horizontally and <8 m vertically if they use both OS
bands. Receivers that use only a single band will still achieve <15 m
horizontally and <35 m vertically, comparable to what the civilian GPS C/A
service provides today. It is expected that most future mass market receivers,
such as automotive navigation system,
will process both the GPS C/A and the Galileo OS signals, for maximum coverage.
- The encrypted Commercial Service (CS) will be available for a fee and
will offer an accuracy of better than 1 m. The CS can also be complemented by
ground stations to bring the accuracy down to less than 10 cm. This signal will
be broadcast in three frequency bands, the two used for the OS signals, as well
as at 12601300 MHz.
In addition, the Galileo satellites will be able to detect and report signals
from COSPAS-SARSAT search-and-rescue beacons in the
406.0406.1 MHz band, which makes them a part of the Global Maritime Distress Safety System (GMDSS).
- The encrypted Public Regulated Service (PRS) and Safety of
Life Service (SoL) will both provide an accuracy comparable to the
Open Service. Their main aim is robustness against jamming and the reliable
detection of problems within 10 seconds. They will be targeted at security
authorities (police, military, etc.) and safety-critical transport applications
(air-traffic control, automated aircraft landing, etc.), respectively.