FORM 2
The Patent Act 1970
(39 of 1970)
&
The Patent Rules, 2005

COMPLETE SPECIFICATION
(SEE SECTION 10 AND RULE 13)
TITLE OF THE INVENTION

“INTELLIGENT INTEGRATED SATELLITE TERMINAL FOR TRAIN TRACKING, CONTROL OFFICE AUTOMATION AND PASSENGER INFORMATION”

APPLICANT:
Name : AVANTEL LIMITED
Nationality : INDIAN
Address : Plot No. 16, Sector-III, HUDA Techno Enclave,
Opp. K Raheja IT park
Madhapur, Hyderabad - 500 081
Andhra Pradesh, India.
The following specification particularly describes and ascertains the nature of this invention and the manner in which it is to be performed:-

Technical Field of the Invention:
[0001] The present invention generally relates to the field of positioning and tracking systems. More particularly the present invention relates to a system and a method for automatically tracking the position of a train and transmitting the data relating position of the train a control center and a passenger information.
Background of the Invention:
[0002] Typically, tracking the position of a vehicle is done using wireless communication networks. Conventionally a global system for mobile communication i.e. a GSM network is used for tracking the position of the vehicle. The usage of GSM network for tracking the position of a vehicle has certain limitations like the coverage area for the GSM network is limited and in the absence of the GSM network the tracking information may be lost at the control center. Further more when the vehicle enters in to a different network the information obtained related to the position of the vehicle is not reliable and also the accuracy of the obtained information varies.
[0003] Conventionally available techniques for tracking the position of a train are restricted to certain geographical coverage areas and lack of ability to provide efficient tracking techniques for locating the position of the train and communicating the obtained information to the control center.
[0004] Thus, there exists a need to develop an integrated satellite terminal suitable for Indian satellites which uses a combination of GSM and GPRS networks for providing real-time information on the status of the train to the control center and to the passengers present in coaches of the train.

Summary of the Invention:
[0005] A method and a system for tracking a position of train utilizing a wireless (satellite) communication network are disclosed. According to a first aspect of the present invention, a method for tracking a position of a train utilizing a wireless communication network includes retrieving coordinates related to the position of the train through a global positioning system. The wireless communication network includes a global system for mobile communication and a global positioning system. An integrated satellite terminal with a plurality of antennae is used for tracking the position of the train. The plurality of antennae includes a global positioning system antenna, a global system for mobile communication antenna, a S-band antenna and an ultra high frequency antenna. The tracked position of the train is plotted on a geographical information system map at the controller center.
[0006] According to the first aspect, the method for tracking a position of a train utilizing a wireless communication network includes storing the retrieved coordinates related to the position of the train in a memory.
[0007] According to the first aspect, the method for tracking a position of a train utilizing a wireless communication network includes processing the stored coordinates related to the position of the train in a micro controller.
[0008] According to the first aspect, the method for tracking a position of a train utilizing a wireless communication network includes comparing the processed coordinates with a predefined positional coordinates of a predefined train route.
[0009] According to the first aspect, the method for tracking a position of a train utilizing a wireless communication network includes tracking the position of the train.
[0010] According to the first aspect, the method for tracking a position of a train utilizing a wireless communication network includes generating information related to the tracking position of the train.
[0011] According to the first aspect, the method for tracking a position of a train utilizing a wireless communication network includes alerting the information to a control centre though an integrated satellite terminal in a mobile satellite service frequency band. Alerting the control centre through the integrated satellite terminal in the mobile satellite service frequency band includes alerting an arrival of the train at a station, alerting a departure of the train from a station, alerting run through exceptions and the like.
[0012] According to the first aspect, the method for tracking a position of a train utilizing a wireless communication network includes displaying the information to persons present in a plurality of coaches of the train by a passenger information system. A light emitting diode display is deployed for displaying the information to the persons present in the plurality of coaches of the train by the passenger information system. Same information will be displayed on the LCD screen of the IST control Unit for the Loco driver.
[0013] According to a second aspect of the present invention, a system with an integrated satellite terminal for tracking a global position of a train includes a synthesized modulator for making a frequency programmable . The integrated satellite terminal communicates data in a global system for mobile communication network. The synthesized modulator includes a frequency synthesizer, a phase locked loop integrated circuit and a loop filter. The frequency synthesizer is provided with an external reference frequency from temperature controlled crystal oscillator and frequency of oscillations from an external voltage controlled oscillator. The integrated satellite terminal operates in at least one of ALOHA mode and a time division multiple access mode.
[0014] According to a second aspect, the system with an integrated satellite terminal for tracking a global position of a train includes a base band control card enabled for transmitting and receiving a global positioning system information.
[0015] According to a second aspect, the system with an integrated satellite terminal for tracking a global position of a train includes a solid state power amplifier enabled to operate in a s-band frequency range. The solid state power amplifier is coupled to a rectangular patch antenna for transmitting a plurality of s-band signals. The base band control card monitors the status of the synthesized modulator and the status of the solid state power amplifier. The solid state power amplifier operates in the s-band frequency range.
[0016] According to a second aspect, the system with an integrated satellite terminal for tracking a global position of a train includes an integrate satellite terminal control unit provided with at least one interface. The interface of the integrated satellite terminal control unit includes an integrated satellite terminal interface, a personal computer interface and a secured digital card interface.
[0017] According to a second aspect, the system with an integrated satellite terminal for tracking a global position of a train includes a global positioning system receiver. The global positioning system receiver is communicatively coupled to a square patch antenna.
[0018] According to a second aspect, the system with an integrated satellite terminal for tracking a global position of a train includes a global system for mobile communication modem. The global system for mobile communication modem is communicatively coupled to a microstrip patch antenna.
[0019] According to a second aspect, the system with an integrated satellite terminal for tracking a global position of a train includes an ultra high frequency transmitter.
[0020] According to a second aspect, the system with an integrated satellite terminal for tracking a global position of a train includes a passenger information system. The passenger information system displays global positioning system information, next station, distance to next station and approximate time to reach next station information to persons present in a plurality of coaches of the train.
[0021] According to a third aspect of the present invention, a passenger information system for displaying global position system information to persons present in a plurality of coaches of a train includes an ultra high frequency receiver. The ultra frequency receiver is communicatively coupled to an antenna.
[0022] According to the third aspect of the present invention, a passenger information system for displaying global position system information to persons present in a plurality of coaches of a train includes a control card. The control card is communicatively coupled to the user input interface device and a liquid crystal display.
[0023] According to the third aspect, a passenger information system for displaying global position system information to persons present in a plurality of coaches of a train includes a light emitting diode panel.
[0024] According to the third aspect, a passenger information system for displaying global position system information to persons present in a plurality of coaches of a train includes a dc-dc converter.
[0025] According to the third aspect, a passenger information system for displaying global position system information to persons present in a plurality of coaches of a train includes a user input interface device and a liquid crystal display. The user input interface device includes a keypad.
Brief Description of the Drawings:
[0026] Other objects and advantages of the present invention will become apparent to those skilled in the art upon reading the following detailed description of the preferred embodiments, in conjunction with the accompanying drawings, wherein like reference numerals have been used to designate like elements, and wherein:
[0027] FIG.1 is a flow chart depicting a process, in accordance with an aspect of the present invention.
[0028] FIG.2 is a diagram depicting a block diagram of an integrated satellite terminal.
[0029] FIG.3 is a diagram depicting a block diagram of a passenger information system.
Detailed Description of the Invention:
[0030] Exemplary embodiments of the present invention are directed towards a method and a system for tracking a position of a train utilizing a wireless communication network is disclosed. According to a first aspect of the present invention, a method for tracking a position of a train utilizing a wireless communication network includes retrieving coordinates related to the position of the train through a global positioning system. The wireless communication network includes a global system for mobile communication and a global positioning system. An integrated satellite terminal with a plurality of antennae is used for tracking the position of the train. The plurality of antennae includes a global positioning system antenna, a global system for mobile communication antenna, a s-band antenna and an ultra high frequency antenna. The tracked position of the train is plotted on a geographical information system map at the controller center.
[0031] According to the first aspect, the method for tracking a position of a train utilizing a wireless communication network includes storing the retrieved coordinates related to the position of the train in a memory.
[0032] According to the first aspect, the method for tracking a position of a train utilizing a wireless communication network includes processing the stored coordinates related to the position of the train in a micro controller as a file format (FAT).
[0033] According to the first aspect, the method for tracking a position of a train utilizing a wireless communication network includes comparing the processed coordinates with a predefined positional coordinates of a predefined train route.
[0034] According to the first aspect, the method for tracking a position of a train utilizing a wireless communication network includes tracking the position of the train through Indian Satellite.
[0035] According to the first aspect, the method for tracking a position of a train utilizing a wireless communication network includes generating information related to the tracking position of the train.
[0036] According to the first aspect, the method for tracking a position of a train utilizing a wireless communication network includes alerting the information to a control centre though an integrated satellite terminal in a mobile satellite service frequency band. Alerting the control centre through the integrated satellite terminal in the mobile satellite service frequency band includes alerting an arrival of the train at a station, alerting a departure of the train from a station, alerting run through exceptions and the like.
[0037] According to the first aspect, the method for tracking a position of a train utilizing a wireless communication network includes displaying the information to persons present in a plurality of coaches of the train by a passenger information system. A light emitting diode display is deployed for displaying the information to the persons present in the plurality of coaches of the train by the passenger information system.
[0038] According to a second aspect of the present invention, a system with an integrated satellite terminal for tracking a global position of a train includes a synthesized modulator for making a voltage controlled oscillator stable at a programmed frequency. The integrated satellite terminal communicates data in a global system for mobile communication network. The synthesized modulator includes a frequency synthesizer, a phase locked loop integrated circuit and a loop filter. The frequency synthesizer is provided with an external reference frequency from temperature controlled crystal oscillator and frequency of oscillations from an external voltage controlled oscillator. The integrated satellite terminal operates in at least one of ALOHA mode and a time division multiple access mode.
[0039] According to a second aspect, the system with an integrated satellite terminal for tracking a global position of a train includes a base band control card enabled for transmitting and receiving global positioning system information.
[0040] According to a second aspect, the system with an integrated satellite terminal for tracking a global position of a train includes a solid state power amplifier enabled to operate in s-band frequency range. The solid state power amplifier is communicatively coupled to a rectangular patch antenna for transmitting a plurality of s-band signals. The based band control card monitors the status of the synthesized module and the status of the solid state power amplifier. The solid state power amplifier operates in the s-band frequency range.
[0041] According to a second aspect, the system with an integrated satellite terminal for tracking a global position of a train includes an integrate satellite terminal control unit provided with at least one interface. The interface of the integrated satellite terminal control unit includes an integrated satellite terminal interface, a personal computer interface and a secured digital card interface.
[0042] According to a second aspect, the system with an integrated satellite terminal for tracking a global position of a train includes a global positioning system receiver. The global positioning system receiver is communicatively coupled to a square patch antenna.
[0043] According to a second aspect, the system with an integrated satellite terminal for tracking a global position of a train includes a global system for mobile communication modem. The global system for mobile communication modem is communicatively coupled to a microstrip patch antenna.
[0044] According to a second aspect, the system with an integrated satellite terminal for tracking a global position of a train includes an ultra high frequency transmitter.
[0045] According to a second aspect, the system with an integrated satellite terminal for tracking a global position of a train includes a passenger information system. The passenger information system displays global positioning system information to persons present in a plurality of coaches of the train through integrated Satellite Terminal
[0046] According to a third aspect of the present invention, a passenger information system for displaying global position system information to persons present in a plurality of coaches of a train includes an ultra high frequency receiver. The ultra frequency receiver is communicatively coupled to an antenna.
[0047] According to the third aspect of the present invention, a passenger information system for displaying global position system information to persons present in a plurality of coaches of a train includes a control cord. The control card is communicatively coupled to the user input interface device and a liquid crystal display.
[0048] According to the third aspect, a passenger information system for displaying global position system information to persons present in a plurality of coaches of a train includes a light emitting diode display panel.
[0049] According to the third aspect, a passenger information system for displaying global position system information to persons present in a plurality of coaches of a train includes a dc-dc converter.
[0050] According to the third aspect, a passenger information system for displaying global position system information to persons present in a plurality of coaches of a train includes a user input interface device and a liquid crystal display. The user input interface device includes a keypad.
[0051] Referring to FIG.1 is a flow chart 100 depicting a process, in accordance with an aspect of the present invention. The satellite-based train tracking system basically includes an Integrated Satellite Terminal (IST), IST Control Unit and Passenger Information System (PIS). According to an exemplary embodiment of the present invention, the flow chart 100 depicts a method for tracking the position of the train with a Global Positioning system.. Initially the coordinates related to the position of the train are retrieved at step 102. The retrieved coordinates related to the position of the train are stored in a memory at step 104. Next the stored coordinates related to the position of the train are processed in a microcontroller at step 106. Further at step 108 the processed coordinates are compared with a predefined positional coordinates of a predefined train route to match the coordinates. Next at step 110 the position of the tracked information related to the tracking position of the train is generated at step 112. Further at step 114 the control center is alerted with the tracked position of the train through a GSM MODEM. Further more emergency messages can be sent from the control center to the integrated satellite terminal. The alerts sent to the control station include an arrival of the train at a station, a departure of the train from a station, run through exceptions and the like. Finally at step 116 the information related to the position of the train is displayed to the passengers present in the coaches of the train through an ultra high frequency communication link, according to an exemplary embodiment of the present invention.
[0052] Referring to FIG.2 is a diagram 200 depicting a block diagram of an integrated satellite terminal (IST). In accordance with an exemplary embodiment of the present invention, the integrated satellite terminal 200 is integrated with a GSM modem 220 for transmitting and receiving the communication signals related to the messages from control center. The integrated satellite terminal of the present invention is best suited to work with Indian satellite system in the GSM network to provide unlimited coverage, which is a non-limiting exemplary aspect of the present invention.
[0053] In accordance with an exemplary embodiment of the present invention, the synthesized modulator 202 is basically a frequency synthesizer provided with an external reference signal from a temperature controlled crystal oscillator (TCXO) and frequency of oscillations from an external voltage controlled oscillator (VCO). The function of the synthesized modulator 202 is to make the voltage controlled oscillator stable at the programmed frequency, which will be in the required frequency channel. The synthesizer 204 includes the voltage controlled oscillator, a phase locked loop integrated circuit (PLL IC) and a loop filter, according to an exemplary embodiment of the present invention. The VCO produces a radio frequency (RF) output which is fed back to the PLL chip. Phase detector in the PLL compares the RF output from the VCO and reference input from external TCXO and takes the difference between the two outputs and produces a constant output when the two phases are equal. The constant output from the phase detector is applied as input to loop filter, which produces voltage that is fed to VCO. The VCO produces a constant RF output. Under the locked condition PLL produces a lock detect output which is of voltage level depending on the power supply input to the PLL chip. The synthesizer output is fed to a binary phase shift keying (BPSK) modulator. The other end of the modulator is fed from a bipolar circuit, in accordance with an exemplary aspect of the present invention.
[0054] According to an exemplary embodiment of the present invention, the integrated satellite terminal 200 includes a base band control card 212 communicatively coupled to the synthesizer 204 and a integrated satellite terminal (IST) control unit 218. The basic functionality of base band Control card includes reception of GPS Position and transmission of text/GPS messages through serial port communication. Application interface is provided to the user through which the terminal can be configured to the requirement. The user can configure the frequency and ID at which the data shall be transmitted. After the frequency is loaded to the synthesizer, the application provided can transmit either the GPS data or Text message. The base band control card is further coupled to a GPS receiver 214 and a GSM modem 220. A square patch antenna 216 is coupled to the GPS receiver for receiving the GPS information and a GSM antenna 222 is coupled to the GSM modem 220. The GSM antenna 222 is a microstrip patch.
[0055] In accordance with an exemplary embodiment of the present invention, the integrated satellite terminal 200 further includes a solid state power amplifier (SSPA) 208 coupled to a S-band antenna 210. The SSPA 208 operates in the S-band frequency. It is a linear amplifier comprising of 4 stages. The first three stages give a total output of 45dB gain. the final stage used is a GaAs FET providing gain of 9 dB, according to an exemplary embodiment of the present invention. The devices are operated in class AB mode. The matching circuit is designed using ADS software and is realized in micro strip technology. A directional coupler at the output produces DC voltage corresponding to the RF output. The DC voltage available at directional coupler is used to generate a Transistor Transistor Logic TTL command for the health status of the SSPA 208. The S-band antenna 210 is a rectangular patch antenna used for transmitting S-band signals. The S-Band antenna 210 is compact in size and has a wide beam width +45?, in accordance with an exemplary aspect of the present invention.
[0056] According to an exemplary embodiment of the present invention, the integrated sated terminal 200 includes an IST control unit 218. The IST control unit 218 is used for configuring number and to send user defined messages. These messages can be entered through alpha numeric keypad and LCD display provided on the front panel. It is connected with IST through RS 232 interface by using shielded cables. IST control Unit 218 consists of Control card, LCD display, keypad and battery. IST control unit 218 is used for configuring the parameters of IST. IST control unit is also used to make the communication between the IST and PC, IST and S-band receiver. The control card also monitors the status of the synthesizer 204 and SSPA 208. In the power ON condition, the terminal works with the default settings, according to a non-limiting exemplary embodiment of the present invention.
[0057] In accordance with an exemplary embodiment of the present invention, the integrated satellite terminal (IST) 200 is provided with an IST control unit 218 using, which the Loco driver can enter, user defined text messages and sends it to control center. The system is provided with battery backup for emergency message transmission and positional information transmission during vehicle supply break down. The system is integrated with GSM/GPRS modem to receive emergency messages from control center such as route diversions, track damage and for LOCO driver. The IST control unit control card is provided with IST interface set/get the configuration parameters of the IST as well as to transmit user defined messages, a personal computer interface (PC interface) i.e. a serial port provision has been provided as an interface between the PC and the IST control unit to upgrade the firmware and a secured digital card interface (SD card interface) provided to upgrade the firmware as well as the entire database related to station co-ordinates and route train details in IST.
[0058] According to an exemplary embodiment of the present invention, IST control unit includes a keypad and an LCD Interface. The interface to IST is through a RS232. The IST control unit derives the operating supply voltage from the IST, a power on switch is provided to ON/OFF the IST control unit. The operation of unit is protected via a biometric interface in order to provide security in field. After valid authentication only, the unit becomes functional.
[0059] In accordance with an exemplary embodiment of the present invention, the operator is able to select the route of the train by entering the train number to the IST and further more the operator is able to send the user defined messages through the IST to the passenger information system through the UHF link whenever PIS is operational and a battery backup is provided for sending emergency messages or self test of IST, when loco power is not available.
[0060] According to an exemplary embodiment of the present invention, the integrated satellite terminal 200 is provided with an ultra high frequency (UHF) transmitter 224 coupled to UHF antenna 226 and a DC-DC converter 228. The UHF transmitter is used to transmit information like current station, next station and distance to next station to passenger information system, which will be installed in the coaches.
[0061] According to an exemplary embodiment of the present invention, the integrated satellite terminal (IST) works on the mobile satellite services (MSS) transponder of the Indian Satellite and within the footprint of Indian satellite. The IST works on the S x C transponder (mobile Satellite services). The operation of the IST is completely automatic i.e. the IST has a micro-controller that is capable of handling large amount of data, fast computation and handles multiple processes like cyclic redundancy check (CRC) calculation, high level data link control (HDLC) framing, scrambling, forward error correction coding (FEC coding), transmission of the messages, configuring the parameters of IST ID, Frequency and the like.
[0062] In accordance with an exemplary embodiment of the present invention, the IST is capable of storing the position information of all the Railway stations along with the route details of all the trains. File Allocation Table (FAT) file system is implemented for the position information of all the Railway stations along with the route details of all the trains. The data in the IST is easily upgradeable in the field through a RS232 interface using laptop or any other handheld interface. The IST has an inbuilt GPS receiver for acquiring the positional data and the speed of the train. Using these co-ordinates IST sends the position data along with the speed of the train at pre-defined time intervals. The IST also transmits the arrival/ departure/ run through messages to control center for integration with networks and mobile systems software (NMS software). The IST is capable of transmitting the messages in two modes Time division multiple access mode (TDMA) or ALOHA mode. In Aloha mode, the message is transmitted three times randomly. In TDMA mode, the terminal waits for its time slot. IST further transmits the arriving station information, distance to the approaching station to the passenger information system (PIS) in the coaches using ultra high frequency (UHF) signal link. IST provides an option for integration with GSM module to receive the emergency or any other messages from the control center.
[0063] Referring to FIG.3 is a diagram 300 depicting a block diagram of a passenger information system (PIS). The passenger information system 300 includes an UHF wireless receiver 302 coupled to an antenna 304. The UHF wireless receiver includes transceiver further includes a of UHF modem, a Control Card 306 communicatively coupled to the UHF receiver 302 and to a LCD display with keypad 310. The passenger information system 300 further includes a DC –DC converter 312.
[0064] According to an exemplary embodiment of the present invention, the IST is provided UHF communication for passenger information in the coaches. The integrated satellite terminal transmits GPS information to the coaches of the train. The Passenger Information System 300 present in the coaches receives the GPS position, processes the data and displays information related to arriving station, distance and the like on the LED panel.
[0065] In accordance with an exemplary embodiment of the present invention, the passenger information system 300 receives arrival and departure information and approaching station information details along with distance from the IST. The communication to the PIS is enabled through an UHF wireless link. The PIS 300 includes a LCD and Keypad to configure the train number. The PIS includes a LED panel to display the passenger information.
[0066] Exemplary specifications of the system are listed below:
Frequency band 2670-2690 MHz
Step Size 5 KHz/10 kHz
Frequency Stability ±1ppm
Power out put 4W ±1dB
Tx. EIRP 9dBW min
Message transmission TDMA or ALOHA
Transmission rate 600 bps
Information rate 300 bps
Format HDLC
Error protection 16 bit CRC
Error correction Rate ½ FEC
Modulation BPSK
Harmonics Better than 30dBc.
SSB Phase noise
@100 Hz -60 dBc / Hz max
@300 Hz -65 dBc / Hz max
@1000 Hz -65 dBc / Hz max
Data interface RS232
Connectors 2 pin circular (DC),
10-pin circular (Data interface)
GPS Receiver Built-in
GSM modem Built-in
UHF transmitter Built- in
Antennas
a) S-Band (MSS) 2670-2690 MHz
1) Type Patch
2) 3.0 dB Beam Width ±45 deg.
b) L-Band (GPS) 1575.42 MHz
Type Patch
Input Voltage 72/110V DC

Passenger Information System (PIS) Specifications
Modulation GFSK
UHF Receiver Built-in

Impedance 50 ohms
User interface LCD display & keypad
Supply 110V DC ± 10%
Interface Connectors SMA (F) for Antenna
2 - Pin connector for input supply
4 – Pin connector for LED Panel (RS 232)
2 - Pin connector for LED panel supply
Antenna Type : Helical (Omni directional)
Connector : SMA (M)
Display type LED RED/yellow
No of Lines 2 max
No of characters 16 max

IST Control unit Specifications:
Authentication Biometric interface
Memory Interface SD card
IST Interface RS232
PC Interface RS 232
MSS Receiver Interface RS 232
User interface LCD display & keypad
Supply 12V DC and Inbuilt battery backup

[0067] As will be appreciated by a person skilled in the art the present invention provides a variety of advantages. Firstly, the integrated satellite terminal provides global positioning information related to the position of the train to the centre. Secondly, the passenger information system provides the information related to the position of the train to the passengers present in the coaches. The information to the passengers in the coaches is displayed on a LCD display. The passenger information system utilizes the UHF link for communicating the messages. Thirdly, a battery backup is provided for sending emergency messages or self test of IST, when loco power is not available.
[0068] While specific embodiments of the invention have been shown and described in detail to illustrate the inventive principles, it will be understood that the invention may be embodied otherwise without departing from such principles

Claims:
1. A method for tracking a position of a train utilizing a wireless communication network, comprising:
retrieving coordinates related to the position of the train through a global positioning system;
storing the retrieved coordinates related to the position of the train in a memory;
processing the stored coordinates related to the position of the train in a micro controller;
comparing the processed coordinates with a predefined positional coordinates of a predefined train route;
tracking the position of the train;
generating an information related to the tracking position of the train;
alerting the information to a control centre though an integrated satellite terminal in a mobile satellite service frequency band; and
displaying the information to persons present in a plurality of coaches of the train by a passenger information system.
2. The method of claim1, wherein the wireless communication network comprises:
a global system for mobile communication;
a global positioning system;
a Mobile satellite services network; and
an Ultra High frequency communication.

3. The method of claim1, wherein an integrated satellite terminal with a plurality of antennae is used for tracking the position of the train.
4. The method of claim3, wherein the plurality of antennae comprises:
a global positioning system antenna;
a global system for mobile communication antenna;
a s-band antenna; and
an ultra high frequency antenna.

5. The method of claim1, wherein alerting the control centre through the integrated satellite terminal in the mobile satellite service frequency band, comprises:
alerting an arrival of the train at a station;
alerting a departure of the train from a station; and
alerting run through exceptions.

6. The method of claim1, wherein the tracked position of the train is plotted on a geographical information system map at the controller center.

7. The method of claim1, wherein a light emitting diode display is deployed for displaying the information to the persons present in the plurality of coaches of the train by the passenger information system.

8. A system with an integrated satellite terminal for tracking a global position of a train, comprising:
a synthesized modulator for making a voltage controlled oscillator stable at a programmed frequency;
a base band control card enabled for transmitting and receiving a global positioning system information;
a solid state power amplifier enabled to operate in a s-band frequency range;
an integrated satellite terminal control unit provided with at least one interface;
a global positioning system receiver;
a global system for mobile communication modem;
an ultra high frequency transmitter; and
a passenger information system.

9. The system of claim8, wherein the integrated satellite terminal communicates data in a global system for mobile communication network.

10. The system of claim9, wherein the solid state power amplifier is communicatively coupled to a rectangular patch antenna for transmitting a plurality of s-band signals.

11. The system of claim10, wherein the global positioning system receiver is communicatively coupled to a square patch antenna.

12. The system of claim10, wherein the global system for mobile communication modems is communicatively coupled to a microstrip patch antenna.

13. The system of claim8, wherein the synthesized modulator comprises:
a frequency synthesizer;
a phase locked loop integrated circuit;
a loop filter.
a reference oscillator; and
a BPSK modulator

14. The system of claim13, wherein the frequency synthesizer is provided with an external reference frequency from temperature controlled crystal oscillator and frequency of oscillations from an external voltage controlled oscillator.

15. The system of claim8, wherein the base band control card monitors the status of the synthesized module and the status of the solid state power amplifier.

16. The system of claim8, wherein the integrated satellite terminal operates in at least one of:
an ALOHAmode ; and
a time division multiple access mode.
17. The system of claim8, wherein the solid state power amplifier operates in the s-band frequency range.

18. The system of claim 8, wherein the at least one interface of the integrated satellite terminal control unit comprises:
an integrated satellite terminal interface;
a personal computer interface;
a secured digital card interface;
a Biometric Finger Print interface;
a LCD and Keypad interface; and
a battery.
19. The system of claim8, where in the passenger information system displays, a global positioning system information to persons present in a plurality of coaches of the train.

20. A passenger information system for displaying a global position system information to persons present in a plurality of coaches of a train, comprises:
an ultra high frequency receiver;
a control card;
a light emitting diode display panel;
a dc-dc converter; and
a user input interface device and a liquid crystal display.
21. The system of claim21, wherein the ultra High frequency receiver is communicatively coupled to an antenna.
22. The system of claim21, wherein the control card is communicatively coupled to the user input interface device and a liquid crystal display.
23. The system of claim21, wherein the user input interface device comprises a keypad.
ABSTRACT
A system and a method for tracking a position of a train utilizing a wireless communication network are disclosed. The system consists of an Integrated satellite terminal (IST), a IST control unit and a passenger Information unit. The method includes a step of retrieving coordinates related to the position of the train through a global positioning system, a step of storing the retrieved coordinates related to the position of the train in a memory, a step of processing the stored coordinates related to the position of the train in a micro controller, a step of comparing the stored coordinates with a predefined positional coordinates of a predefined train route, a step of tracking the position of the train, a step of generating an information related to the tracking position of the train, a step of alerting the information to a control centre though an integrated satellite terminal in a mobile satellite service frequency band and finally displaying the information to persons present in a plurality of coaches of the train by a passenger information system.