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

“Ultra High Frequency System (SATCOM & Line Of Sight) for Voice and Data Communication”

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 wireless signal communication. More particularly the present invention relates to an ultra high frequency (UHF) terminal for operating in a dual mode of Satellite Communication and Line of Sight Communication.
Background of the Invention:
[0002] Typically, a wireless communication is one of a conventional techniques used for communicating a variety of information. The wireless communication has brought an increasing improvement in modern communication system. In military, soldiers must be able to communicate in a reliable manner with others on the land, in the sea, in the air and in many other places. The wireless communication systems provide a more reliable and accurate communication.
[0003] The conventional line of sight (LOS) communication system is used for voice and data communication. But the obstacles like mountains, buildings and the far distances between transmitter and receiver reduces the range of transmission and reception of signals.
[0004] In order to overcome the limitations of LOS communication system, SATCOM (Satellite Communication) has been developed. SATCOM is a wireless transceiver. An Ultra High Frequency System (UHF System) receives the signals from UHF band in SATCOM communication mode and receives the signals from VHF/UHF band in LOS communication mode. In conventional method there is no UHF System to work with the Indian satellite for voice and data communication and there is no UHF System with integrated SATCOM and LOS modes of operation.
[0006] So there exists a need for an indigenous UHF terminal having simultaneous SATCOM and LOS modes to communicate voice and data signals with high reliability over a large coverage area and accuracy adaptable for Indian satellite transponder network.
Summary of the Invention:
The UHF System (SATCOM & Line Of Sight) for Voice and Data Communication consists of UHF Radio, UHF Satcom Power Amplifier, UHF LOS Power Amplifier and AC-DC power Supply.
[0007] An Ultra High Frequency Terminal for signal communication enabling dual mode operation for Indian Satellite is disclosed. According to first aspect of the present invention, an ultra high frequency terminal for signal communication enables simultaneous operation in dual mode includes a module enabling operation in a satellite communication mode for full a duplex voice and Data communication. The ultra high frequency terminal further includes an in-built global position system. The first module is a satellite communication module. The first module will enable operation in either Demand Assigned Multiple Access (DAMA) or a Permanent Assigned Multiple Access (PAMA) mode.
[0008] According to the first aspect, the UHF terminal for communication enables simultaneous operation in SATCOM and in LOS mode for a half duplex signal communication. The UHF terminal includes separate audio interfaces for the SATCOM communication module and the LOS communication module. The signal is digitally processed using a vocoder, a codec and a subscriber line interface circuit provided in a base band section. The vocoder performs the Audio signal compression for transmitting the signal and signal decompression for receiving the signal.
[0009] According to the first aspect, the UHF terminal for signal communication enables simultaneous operation in a dual mode includes a dedicated first antenna for operating the UHF terminal in the satellite communication mode. The dedicated first antenna for operating the UHF terminal in the satellite communication mode includes a printed crossed dipole antenna designed for circular polarization.
[0010] According to the first aspect, the UHF terminal for signal communication enables simultaneous operate in a dual mode includes a dedicated second antenna for operating the UHF terminal in LOS communication mode. The dedicated second antenna for operating the UHF terminal in the LOS communication mode includes a coaxial dipole antenna designed for vertical polarization. The UHF terminal further includes a built-in test equipment.
[0011] According to a second aspect, the UHF terminal for signal communication enables independent operation in a dual mode includes a first module enabling operation in satellite communication mode for a full duplex voice and Data communication.
[0012] According to the second aspect, the UHF terminal for signal communication enables independent operation in a dual mode includes a second module enabling operation in LOS communication mode for a half duplex voice and Data communication. The second module is LOS communication module.
[0013] According to a second aspect, the UHF terminal for signal communication enables independent operation in a dual mode includes a dedicated first antenna for operating the UHF terminal in the satellite communication mode. The dedicated first antenna for operating the UHF terminal in the satellite communication mode includes a printed crossed dipole antenna designed for circular polarization.
[0014] According to the second aspect, the UHF terminal for signal communication enables independent operation in a dual mode includes a second antenna for operating the UHF terminal in LOS communication mode. The dedicated second antenna for operating the UHF terminal in the LOS communication mode includes a coaxial dipole antenna designed for vertical polarization.
[0015] According to third aspect, the satellite communication module for a full duplex signal communication includes a satellite communication transmitter. The satellite communication module further includes an UHF satellite communication power amplifier.
[0016] According to the third aspect, the satellite communication module for a full duplex signal communication includes phase shift keying modulator for modulating the carrier signal to be transmitted.
[0017] According to the third aspect, the satellite communication module for a full duplex signal communication includes a satellite communication receiver.
[0018] According to the third aspect, the satellite communication module for a full duplex signal communication includes phase shift keying demodulator for demodulating a received signal.
[0019] According to the third aspect, the satellite communication module for a full duplex signal communication includes a combined based band section and a control card section.
[0020] According to the third aspect, the satellite communication module for a full duplex signal communication includes a local oscillator (LO) block for interfacing the satellite communication transmitter and the satellite communication receiver.
[0021] According to a fourth aspect, the LOS communication module for a half duplex signal communication includes a LOS transmitter.
[0022] According to the fourth aspect, the LOS communication module for a half duplex signal communication includes frequency modulation(FM) modulator for modulating the transmission signal.
[0023] According to the fourth aspect, the LOS communication module for a half duplex signal communication includes a LOS receiver.
[0024] According to the fourth aspect, the LOS communication module for a half duplex signal communication includes FM demodulator for demodulating the received signal. The LOS communication module further includes a LOS communication power amplifier in UHF band.
[0025] According to a fifth aspect, for enhanced signal communication simultaneously and independently in a dual mode operation of the UHF terminal includes a first module in the satellite communication mode for a full duplex data communication. The first module is a satellite communication module. The satellite communication module enables operation in either a DAMA mode or a PAMA mode.
[0026] According to the fifth aspect, for enhanced signal communication simultaneously and independently in a dual mode operation of UHF terminal includes a second module in LOS communication mode for a half duplex signal communication. The second module is a LOS communication module. The terminal further includes deploying a separate audio interface for the satellite communication module and the LOS communication module.
[0027] According to the fifth aspect, for enhanced signal communication simultaneously and independently in a dual mode operation of UHF terminal includes a first dedicated antenna for operating the UHF terminal in the satellite communication mode. The method for enhanced signal communication simultaneously and independently in a dual mode for operating the UHF terminal further includes deploying a vocoder, a codec and a subscriber line interface circuit in a base band section of the UHF terminal for digital processing of the signal.
[0028] According to the fifth aspect, for enhanced signal communication simultaneously and independently in a dual mode operation of UHF terminal includes deploying a second dedicated antenna for operating the UHF terminal in the LOS communication mode.
Brief Description of the Drawings:
[0029] 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:
[0030] Referring to FIG. 1 is a diagram depicting a satellite communication (SATCOM) module of an ultra high frequency Radio of the UHF System.
[0031] Referring to FIG.2 is a diagram depicting a line of sight communication (LOS) communication module of an ultra high frequency Radio of the UHF System.
[0032] Referring to FIG.3 is a diagram depicting a UHF SATCOM power Amplifier of UHF System.
[0033] Referring to FIG.4 is a diagram depicting a UHF LOS power Amplifier of UHF System.
Detailed Description of the Invention:
[0034] Exemplary embodiments of the present invention are directed towards a UHF terminal and a method for signal communication enabling operation in a dual mode is disclosed. According to a first aspect of the present invention, an UHF terminal for signal communication enabling operation simultaneously in a dual mode includes a first module to operate in a satellite communication mode for full a duplex voice and Data communication. The UHF terminal further includes an in-built global position system receiver. The first module is a satellite communication module. The first module enables operation in either a DAMA mode or a PAMA mode.
[0035] According to the first aspect, the UHF terminal for signal communication enabling operation simultaneously in a dual mode includes a second module to operate in a LOS communication mode for a half duplex voice and data communication. The second module is a LOS communication module. The UHF terminal includes a separate audio interface deployed for the satellite communication module and the LOS communication module. The signal is digitally processed using a vocoder, a codec and a subscriber line interface circuit deployed in a base band section of the UHF terminal. The vocoder performs the signal compression for transmitting the signal and a signal decompression at the receiving end.
[0036] According to the first aspect, the UHF for signal communication enabled to operate simultaneously in a dual mode includes a dedicated first antenna for operating the UHF terminal in the satellite communication mode. The dedicated first antenna for operating the UHF terminal in the satellite communication mode includes a printed crossed dipole antenna designed for enabling a circular polarization.
[0037] According to the first aspect, the UHF terminal for signal communication enabled to operate simultaneously in a dual mode includes a dedicated second antenna for operating the UHF terminal in a line of sight communication mode. The dedicated second antenna for operating the UHF terminal in the line of sight communication mode includes a coaxial dipole antenna designed for enabling a vertical polarization. The UHF terminal further includes a built in test equipment.
[0038] According to a second aspect, an UHF terminal for signal communication enabled to operate individually in a dual mode includes a first module enabled to operate in a satellite communication mode for a full duplex voice and Data communication. The first module is a satellite communication module. The first module is enabled to operate in at least one of a demand assigned multiple access mode and a permanent assigned multiple access mode.
[0039] According to the second aspect, the high frequency terminal for signal communication enabled to operate individually in a dual mode includes a second module enabled to operate in a line of sight communication mode for a half duplex voice and Data communication. The second module is a line of sight communication module.
[0040] According to the second aspect, the UHF terminal for signal communication enabled to operate individually in a dual mode includes a dedicated first antenna for operating the ultra high frequency terminal in the satellite communication mode. The dedicated first antenna for operating the UHF terminal in the satellite communication mode includes a printed crossed dipole antenna designed for enabling a circular polarization.
[0041] According to the second aspect, the UHF terminal for signal communication enabled to operate individually in a dual mode includes a dedicated second antenna for operating the UHF terminal in a line of sight communication mode. The dedicated second antenna for operating the UHF terminal in the line of sight communication mode includes a coaxial dipole antenna designed for enabling a vertical polarization.
[0042] According to a third aspect, a satellite communication module for a full duplex signal communication includes a satellite communication transmitter. The satellite communication module further includes an ultra high frequency satellite communication power amplifier.
[0043] According to the third aspect, the satellite communication module for a full duplex voice and data communication includes phase shift keying modulator for modulating a signal to be transmitted.
[0044] According to the third aspect, the satellite communication module for a full duplex voice and Data communication includes a satellite communication receiver.
[0045] According to the third aspect, the satellite communication module for a full duplex signal communication includes Quadrature phase shift keying demodulator for demodulating a received signal.
[0046] According to the third aspect, the satellite communication module for a full duplex voice and data communication includes a combined based band section and a control card section.
[0047] According to the third aspect, the satellite communication module for a full duplex signal communication includes a local oscillator (LO) block for interfacing the satellite communication transmitter and the satellite communication receiver.
[0048] According to a fourth aspect, a line sight communication module for a half duplex signal communication includes a line of sight transmitter.
[0049] According to the fourth aspect, the line of sight communication module for a half duplex signal communication includes frequency modulator for modulating a transmission signal.
[0050] According to the fourth aspect, the line of sight communication module for a half duplex signal communication includes a line of sight receiver.
[0051] According to the fourth aspect, the line of sight communication module for a half duplex signal communication includes frequency demodulator for demodulating a received signal. The line of sight communication module further includes an ultra high frequency line of sight communication power amplifier.
[0052] According to a fifth aspect, a method for enhanced signal communication simultaneously and individually in a dual mode by adapting an UHF terminal includes operating a first module in a satellite communication mode for a full duplex voice and data communication. The first module is a satellite communication module. The satellite communication module is enabled to operate in at least one of a demand assigned multiple access mode and a permanent assigned multiple access mode.
[0053] According to the fifth aspect, the method for enhanced signal communication simultaneously and individually in a dual by adapting an ultra high frequency terminal includes operating a second module in line of sight communication mode for a half duplex signal communication. The second module is a line of sight communication module. The method for enhanced signal communication simultaneously and individually in a dual mode by adapting an ultra high frequency terminal further includes deploying a separate audio interface for the satellite communication module and the line of sight communication module.
[0054] According to the fifth aspect, the method for enhanced signal communication simultaneously and individually in a dual mode by adapting an UHF terminal includes deploying a first dedicated antenna for operating the UHF terminal in the satellite communication mode. The method for enhanced signal communication simultaneously and individually in a dual mode by adapting an ultra high frequency terminal further includes deploying a vocoder, a codec and a subscriber line interface circuit in a base band section of the ultra high frequency terminal for digital processing of the signal.
[0055] According to the fifth aspect, the method for enhanced signal communication simultaneously and individually in a dual by adapting an ultra high frequency terminal includes deploying a second dedicated antenna for operating the UHF terminal in the line of sight communication mode.
[0056] Referring to FIG. 1 is a diagram 100 depicting a satellite communication (SATCOM) module of an UHF terminal. The UHF terminal operates simultaneously and individually in a dual mode. According to an exemplary embodiment of the present invention, the satellite communication module 100 of the ultra high frequency terminal employs a full duplex voice and data communication technique for communication. The UHF terminal acts a transceiver for full duplex signal communication in a SATCOM mode. The UHF terminal transmits/ receives the signals in UHF band (240-320 MHz) using Indian Satellite transponder Network in Satcom mode and transmits/ receives the signals in VHF/UHF band (100-400 MHz) in LOS communication mode, in accordance with an exemplary embodiment of the present invention. The UHF terminal includes two antennas one for satcom mode and another for LOS mode. The terminal is having built in GPS receiver. The first antenna designated for operating the UHF terminal in the satellite communication mode is a printed crossed dipole antenna designed for enabling a circular polarization.
[0057] According to an exemplary embodiment of the present invention, the SATCOM module includes a SATCOM signal transmitter 115 and a SATCOM signal receiver 105. The SATCOM module 100 is used for communicating signals over a large coverage area. The ultra high frequency terminal of the present invention is best suited for Indian satellites, according to an exemplary embodiment of the present invention. Further more the SATCOM module is enabled to operate in a demand assigned multiple access (DAMA) mode/ a permanent assigned multiple access (PAMA) mode. The UHF terminal has Eb/No = 7dB with BER of 1 x 10-6, according to an exemplary embodiment of the present invention.
[0058] In accordance with a non-limiting exemplary embodiment of the present invention, the SATCOM module employs a digital modulation technique for signal transmission and reception. The digital modulation techniques provide a better quality and further provide a secured network for communication. The SATCOM module 100 includes a base band and control card 130 with a built in global positioning system receiver. The base band and control card 130 is communicatively coupled to a liquid crystal display (LCD), a keypad, or a telephonic device 135 for voice communication, a RS232/ Ethernet link for data communication with a work station 140 (a computer system) and the like.
[0059] According to an exemplary embodiment of the present invention, a vocoder deployed in the base band card 130 performs the voice compression and decompression with coding rate of 2.4kbps.After adding overheads, it gives 2.88kbps digitized data to a Quadrature Phase Shift Keying (QPSK) modulator 120. The SATCOM module includes the Quadrature Phase Shift Keying (QPSK) modulator 120 for modulating a signal to be transmitted, a local oscillator (LO) block 110 interfaces the SATCOM receiver 105 and the QPSK modulator 120. The QPSK modulator 120 encodes, modulates and generates a 70MHz signal (for example) to the SATCOM transmitter 115. The local oscillator is fed with a reference frequency (Ref Freq). The local oscillator 110 used to generate a signal normally for the purpose of converting a signal of interest to a different frequency range, in accordance with an exemplary embodiment of the present invention.
[0060] According to an exemplary embodiment of the present invention, at the receiving end i.e., at the SATCOM receiver 105 the received frequency (240-270MHz) from Satellite is down converted to 70 MHz signal by using down converter. The received 70 MHz signal is fed to the Quadrature Phase Shift Keying (QPSK) demodulator 125 for demodulation and decoding. Further the demodulated signal is fed to base band card 130 for voice processing. The processed voice signal is made available on the headset provided with radio or other mobile communication device. A similar process discussed above is implemented for data communication in SATCOM mode with a data rate of 16Kbps and transmission rate of 19.2Kbps, according to an exemplary embodiment of the present invention. In SATCOM mode the voice communication uses a 2.4 Kbps codec and data communication is 16Kbps, in accordance with an exemplary embodiment of the present invention.
[0061] In accordance with an exemplary embodiment of the present invention, Voice signal is processed by the vocoder, codec and Subscriber Line Interface Circuit (SLIC) in the base-band section 130 of the terminal. Modulation, demodulation, encoding and decoding algorithms are implemented in digital signal processor (DSP). Voice protocols like detecting OFF-hook or ON-hook, programming synthesizers and controlling of all the sub modules will be implemented in a 32-bit ARM based micro controller, according to an exemplary embodiment of the present invention. The micro controller has a RS232/Ethernet interface for data trans-reception. The terminal is tunable with 5 KHz & 25 KHz channels, for example. The transponder is expected to have 10 narrowband 5 KHz channels and one wideband 25 KHz channel, according to an exemplary embodiment of the present invention.
[0062] Referring to FIG.2 is a diagram 200 depicting a line of sight communication (LOS) communication module of an ultra high frequency terminal. In LOS voice / data communication utilizes a narrow band and wide band frequency modulation (FM). The dedicated second antenna for operating the ultra high frequency terminal in the line of sight communication mode comprises a coaxial dipole antenna designed for enabling a vertical polarization. The LOS module 200 is provided with a FM Modem and LOS Transceiver module. The Communication mode in LOS is half duplex. Narrow band FM is provided for voice communication and wide band FM is provided for data communication. The voice is fed using a microphone or other communication device 215, according to an exemplary embodiment of the present invention.
[0063] According to an exemplary embodiment of the present invention, the LOS module includes a LOS transmitter 205, a FM modulator 210 for modulating voice and data signals. The receiver section of LOS module 200 includes a LOS receiver 220, a pair of FM demodulators 225, 230 for demodulating received voice and data signals and head phone to listen the received voice signal. In the transmission mode FM modulator 210 will modulate voice signal from Push to Talk PTT mike. Modulated signal from FM Modulator 210 is up-converted by LOS Transceiver module. The terminal receives a modulated voice signal from satellite; it is down converted and given to FM demodulator 225. The demodulated voice signal is amplified and provided as output on a speaker or headset 235. The above mentioned communication technique is employed during data transmission by selecting wideband FM mode in FM Modem.
[0064] In accordance with an exemplary embodiment of the present invention, in the dedicated first antenna for operating the ultra high frequency terminal in the satellite communication mode includes a printed crossed dipole antenna designed for enabling a circular polarization. These antennas provide broad pattern coverage in low profile, high power, lightweight and highly portable package. The antennae are rugged, designed for all environments and meet mission requirements that demand flexibility and mobility. Accordingly, wherein the dedicated second antenna for operating the operating the ultra high frequency terminal in the line of sight communication mode includes a coaxial dipole antenna designed for enabling a vertical polarization. This is low profile, high power, and lightweight. The antenna is rugged enough to with stand for all environments and meets mission requirements that demand flexibility and mobility. Further more the ultra high frequency terminal has a built in test equipment capability and a separate audio interface for SATCOM module and the LOS module.
[0065] Referring to FIG.3 is a diagram 300 depicting a UHF SATCOM power amplifier. The basic functionality of UHF satcom power amplifier 300 is to deliver the power required for transmitting voice and data in SATCOM mode. The UHF SATCOM power amplifier unit 300 consists of band pass filter (BPF) 335, a preamplifier (Pre Amp) 330, driver amplifier (DA) 325, high power module (HPM) 325, a dual directional coupler (DDC) 320, duplexer 310, a SATCOM antenna 305, a control card 340 and front panel indications 345. According to an exemplary embodiment of the present invention ALARM and automatic level control (ALC) signals are fed to the preamplifier.
[0066] In accordance with an exemplary embodiment of the present invention, the SATCOM power amplifier 300 operates in the frequency band of 290-320 MHz and is capable of delivering a maximum power of 200W. The power amplifier is constructed by using hybrid couplers to achieve stability. Forced air-cooling is provided for proper heat dissipation from the amplifier, according to an exemplary embodiment of the present invention.
[0067] Referring to FIG.4 is a diagram 400 depicting a UHF LOS power amplifier. The basic functionality of UHF LOS power amplifier 400 is to deliver the power required for transmitting voice and data in LOS. The UHF LOS power amplifier consists of a band pass filter (BPF) 440, pre amplifier (Pre Amp) 435, driver amplifier (DA) 430, high power module (HPM) 425, Quadrature dividers, a fixed subscriber unit 415, a switch 410, a LOS antenna 405, a control card 445 and front panel indications 450. The LOS power amplifier is capable of delivering a maximum power of 100W. Dual directional couplers (DDC) 425 are used for monitoring forward and reflected powers and for Voltage standing wave ratio (VSWR) protection. The Filter switching Unit (FSU) 415 is used at the output of DDC 425 to meet the harmonic suppression at the output of the power amplifier. According to an exemplary embodiment of the present invention alarm and automatic level control (ALC) signals are fed to the preamplifier. The switch 410 is used at the input of the Amplifier to operate the system in the half duplex configuration.
[0068] In accordance with an exemplary embodiment of the present invention, the ultra high frequency System supports multiple platforms like maritime platform (shipboard and submarine), airborne platform (fixed winged aircraft and rotary winged aircraft), and land fixed platform and the like.
[0069] According to an exemplary embodiment of the present invention, the development of UHF terminal solves the problem of indigenous terminal with Indian satellite for voice and data communication. Simultaneous satcom and LOS modes enable a user to have both communications at a time. This is an integrated indigenous system and it is compact designed to suit all environmental specification for defense sector with low cost.

[0070] Exemplary specifications of the UHF terminal are listed below:
Parameter Specification
Tx Frequency 290-320 MHz
Rx Frequency 240-270 MHz
EIRP 10 dBw/23 dBW
G/T -27dB/K
Network Access PAMA/DAMA
Coding Rate 2.4 Kbps/16KBPS
Transmission Rate 2.88 Kbps/ 19.2Kbps
Modulation QPSK
Acquisition Continuous mode with acquisition Time < 500msec (typical), acquisition range 5KHz
BER required with coding 10–6
Eb/No 7.0dB
FEC Coding 1/2 RATE, K=7
LOS
Frequency of operation 100 to 400 MHz
Modulation type Narrow band FM / broad band FM
Mode of communication Half duplex
Channel spacing 10 KHz NB/ 100 KHz WB
Frequency tuning step size 5KHz
Sensitivity -120 dBm for 10dB SINAD (Narrow band FM)
Output power 100 W
Preset channels 100
Antennae
Coaxial Dipole Antenna
Frequency 100-400MHz
Polarization Vertical
Gain 2dBi
Radiation pattern Omni directional
Wind speeds Up to 160 knots
Impedance 50 Ohms
Printed Crossed Dipole Antenna
Frequency 240-320 MHz
VSWR 2:1 (Max)
Polarization Circular
3 dB Beam-width 900 (nom)
Environmental (ship borne)
As per JSS- 55555 table N1 for terminal.
As per JSS- 55555 table N2 for antennae.
As per MIL-STD-810 F ( airborne platform)
EMI/EMC as per MIL-STD-461E

[0071] As will be appreciated by a person skilled in the art, the present invention provides a wide variety of advantages. Firstly, the system is suitable for working on multiple platforms. Secondly the antennas are designed for all environments and meet mission requirements that demand flexibility and mobility. Thirdly the antennas are light in weight. Finally the system has a facility to monitor and control the terminal through remote interface.
[0072] 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. An ultra high frequency terminal for signal communication enabled to operate simultaneously in a dual mode, comprising UHF Radio (Satcom and LOS module), UHF Satcom Power Amplifier, UHF LOS power Amplifier and AC-DC power Supply.
a first module in UHF radio enabled to operate in a satellite communication mode for full a duplex voice and data communication;
a second module in UHF Radio enabled to operate in a line of sight communication mode for a half duplex voice and data communication;
a dedicated first antenna for operating the ultra high frequency terminal in the satellite communication mode; and
a dedicated second antenna for operating the ultra high frequency terminal in a line of sight communication mode.
2. The ultra high frequency terminal of claim1, where in the signal comprises at least one of:
a data signal;
a voice signal;
3. The ultra high frequency terminal of claim1 further comprises an inbuilt global position system receiver.
4. The ultra high frequency terminal of claim1, wherein the first module is a satellite communication module and the second module is a line of sight communication module.
5. The ultra high frequency terminal of claim1 further comprises a separate audio interface deployed for the satellite communication module and the line of sight communication module.
6. The ultra high frequency terminal of claim1, where in the first module is enabled to operate in at least one of :
a demand assigned multiple access mode; and
a permanent assigned multiple access mode.
7. The ultra high frequency terminal of claim1, wherein the signal is digitally processed using a vocoder, a codec and a subscriber line interface circuit deployed in a base band section of the ultra high frequency terminal.
8. The ultra high frequency terminal of claim7, wherein the vocoder performs the signal compression for transmitting signal and a signal decompression for receiving the signal.
9. The ultra high frequency terminal of claim1, where in the dedicated first antenna for operating the ultra high frequency terminal in the satellite communication mode comprises a printed crossed dipole antenna designed for enabling a circular polarization.
10. The ultra high frequency terminal of claim1, wherein the dedicated second antenna for operating the ultra high frequency terminal in the line of sight communication mode comprises a coaxial dipole antenna designed for enabling a vertical polarization.
11. The ultra high frequency terminal of claim1 further comprises a built in test equipment for status and fault diagnosis.
12. An ultra high frequency terminal for signal communication enabled to operate individually in a dual mode, comprising:
a first module enabled to operate in a satellite communication mode for a full duplex voice and data communication;
a second module enabled to operate in a line of sight communication mode for a half duplex signal communication;
a dedicated first antenna for operating the ultra high frequency terminal in the satellite communication mode; and
a dedicated second antenna for operating the ultra high frequency terminal in a line of sight communication mode.
13. The ultra high frequency terminal of claim12, wherein the first module is a satellite communication module and the second module is a line of sight communication module.
14. The ultra high frequency terminal of claim12, where in the first module is enabled to operate in at least one of :
a demand assigned multiple access mode; and
a permanent assigned multiple access mode.
15. The ultra high frequency terminal of claim12, where in the dedicated first antenna for operating the ultra high frequency terminal in the satellite communication mode comprises a printed crossed dipole antenna designed for enabling a circular polarization.
16. The ultra high frequency terminal of claim12, wherein the dedicated second antenna for operating the ultra high frequency terminal in the line of sight communication mode comprises a coaxial dipole antenna designed for enabling a vertical polarization.

17. The ultra high frequency terminal of claim12 further comprises a RS232 port to control and monitor the ultra high frequency terminal through a personal computer.

18. A satellite communication module for a full duplex signal communication, comprising:
a satellite communication transmitter;
at least one Quadrature phase shift keying modulator for modulating a signal to be transmitted;
a satellite communication receiver;
at least one Quadrature phase shift keying demodulator for demodulating a received signal;
a combined based band section and a control card section; and
a local oscillator block for interfacing the satellite communication transmitter and the satellite communication receiver.
19. The satellite communication module of claim18 further comprises an ultra high frequency satellite communication power amplifier.

20. A line sight communication module for a half duplex signal communication, comprising:
a line of sight transmitter;
at least one frequency modulation modulator for modulating a transmission signal;
a line of sight receiver; and at least one frequency modulation demodulator for demodulating a received signal.
21. The line of sight communication module of claim19 further comprises an ultra high frequency line of sight communication power amplifier.
22. A method for enhanced signal communication simultaneously and individually in a dual mode by adapting an ultra high frequency terminal, comprises:
operating a first module in a satellite communication mode for a full duplex voice and data communication;
operating a second module in line of sight communication mode for a half duplex voice and data communication;
deploying a first dedicated antenna for operating the ultra high frequency terminal in the satellite communication mode; and
deploying a second dedicated antenna for operating the ultra frequency terminal in the line of sight communication mode.
23. The method of claim22, wherein the first module is a satellite communication module and the second module is a line of sight communication module.

24. The method of claim23, wherein the satellite communication module is enabled to operate in at least one of :
a demand assigned multiple access mode; and
a permanent assigned multiple access mode.
25. The method of claim22 further comprises deploying a separate audio interface for the satellite communication module and the line of sight communication module.

26. The method of claim 22 further comprises deploying a vocoder, a codec and a subscriber line interface circuit in a base band section of the ultra high frequency terminal for digital processing of the signal.

ABSTRACT
An ultra high frequency (UHF) terminal for voice and data communication enabled to operate simultaneously in a dual mode is disclosed. The UHF terminal includes a first module enabled to operate in a satellite communication mode for full duplex voice and data communication, a second module enabled to operate in a line of sight communication mode for a half duplex voice and data communication, a dedicated first antenna for operating in the satellite communication mode and a dedicated second antenna for operating in a line of sight communication mode. The Ultra High Frequency System (SATCOM & Line Of Sight) for Voice and Data Communication consists of UHF Radio, UHF Satcom Power Amplifier, UHF LOS Power Amplifier and AC-DC power Supply.