New Schemes For Vehicle-mounted GPS/GPRS/CDMA System
With the gradual deepening of economic
reform and market economic system,highway construction, road
transportation and other transportation
is leapingforward development, in order to realize
the further management oftransportation market, ensure
transportation safety and a series of
objectives,transportation departments at all levels are actively
promoting "intelligent": that is, through the use of
advanced information, communication, control and other high technology
to the traditional transportation system transformation and the
formation of a kind of
information, intelligence, social model of transportation.
Installed
onboard GPS satellite positioning system in the long-distance
bus,tourist bus, dangerous goods transport vehicles, through the
central monitoring system can real-time monitoring
of vehicles, the supervision of the administrative department
of drivers speeding, fatigue driving, improve
transportation production organization level and has auxiliary management actively; at
the same time, the monitoring center can implement the
alarm function and is
inoverdrive, anchor, long-distance operation, so as
to reduce the incidence of traffic accidents, has active
significance to improve transportation safety
production. The car GPS system has been related to the
management ofdepartments and enterprises understand and is actively
promoting the application of.
Research
Institute is a professional engaged in VOIP and wireless
datacommunication technology research institute, the
Institute have been introduced to the market a series of
GPRS wireless communication products, combined withmobile
GPS technology, introduced a new generation of full IP
network GPS vehicle monitoring and transmission system, TCP/IP
data communication withSMS Backup innovative use of GPRS
replaced the completely by SMS to transmit data
communication in the past, composite has a higher performance to
price ratio.
Analysis of the
existing vehicle GPS short message system
The
existing vehicle GPS short message communication
system mainly uses the GSM short message to
achieve, as its typical application:
1. The existing
GPS SMS technology characteristics
Collecting
and processing location information of vehicle
GPS information on GPS
device of real-time acquisition.
Vehicle
GPS information machine on the processed
information to send text messages to
the operation timing monitoring center of the corresponding
SP ormobile phone number specified.
Operation monitoring
center through the receiving vehicle GPS informationcorresponding to
the SP or the designated mobile phone number.
Under special
circumstances, operation monitoring center
through direct send short message control vehicle
GPS system SP or the designated mobile phone number, such
as alarm or compulsory flameout.
2.The existing
GPS SMS program faults
Delivery time: because
of the uncertain message channel slot to
transmitcommands, no data channel special, so appear
in the command slot busy is easy to appear the data transmission
delay or loss of.
The limited channel
capacity: a message can transmit 140 bytes available,cannot
reflect the real time information of the vehicle to.
The expensive
communication cost: according to
the total number andcalculation.
Scalability: using
SMS as the main communication link, affected by the link bandwidth, could
not be further extended to other data transmission service
in the future. If the vehicle is running image
monitoring etc..
Although the GPS
vehicle monitoring system is conducive to the transportation
department in intelligent traffic management, but the poor
comprehensive performance of SMS and the comprehensive
promotion of the system.
Development
status and analysis of GPRS technique
GPRS (General Packet Radio Service general
packet radio service) is developed in the existing
GSM network on a new packet switched data service.GPRS is
a global mobile communication network technology of the
third generation mobile communication (3G) the mainstream
technology and an important milepost, known as the
2.5 generation mobile communication.Compared with the traditional GSM
circuit dial exchange, GPRS in the efficiency of resource
use, exchange capacity and performance have a qualitative
leap.GPRS abandoned the traditional exclusive circuit switched
mode, the packet switching technology, each
user can use a plurality of
wireless channel, thewireless channel may be shared by multiple
users, effective utilization of channel
resources, bandwidth of up to 171.2Kb/s. At
present, China Mobile GPRS coverage in the
central city of almost 100%, in a remote area has reached
more than 80%, the actual application of bandwidth is about
20-40Kb/s, especially suitable for the demand of financial
transactions like burst communication,remote monitoring and
other industries in various, low rate, completely replace
the traditional wired MODEM, X.25, digital radio, the
short message communication mode.
GPRS uses the
TCP/IP protocol, very easy and the existing INTERNETtechnology
and application integration platform, will make all kinds of
IPtechnology and service combined with the mobile communication
technology, to provide a variety
of high quality moving moving data communication
service for customers.
Advantages of
GPRS data transmission
(1) mobile
communication: GPRS wireless communication has broken the fixed
position of wired communication restrictions, according
to business needs at any time or data
transmission, communication greatly expanded the areas.
(2) cost: GPRS
network according to the customer data flow of sending and
receiving data packets to charge, instead of using SMS
charges according to the message number, and greatly reduces
the communication cost. The GPS monitoring system for
example, the same amount of business, its communicationcost is
about 1/5~1/8 of the past, has a strong
cost competitiveness and marketpromotion. At present, China
Mobile has also launched a package of $900excluding
traffic preferential policies.
(3) always
online: customer is always keep in touch with the
network, even in the absence of data transfer, the
customer also maintains a connection between the
Internet and the network still.
(4) fast
login: connection time soon. GPRS wireless terminal a
boot, already with the GPRS network connection is
established, each time to log on to the network,only
one activation process, generally only .