Parimal Majithiya - Academia.edu (original) (raw)

Papers by Parimal Majithiya

Research paper thumbnail of Synthesized Binary Offset Carrier Modulation for Interoperable GNSS L1 Band Signals

Research paper thumbnail of Communication Group (ODCG)

Interoperability and compatibility is the main goal for current GNSS systems. A concept of Global... more Interoperability and compatibility is the main goal for current GNSS systems. A concept of Global Navigation Satellite System (GNSS) is to use all navigation system together to provide better capabilities compared with those that would be achieved relying solely on one service or signal. Compatibility, on the other hand, assures that existing GNSS signal is not degrading each other below certain threshold. GNSS provider is concerned about their own signal as well as other signals from different service provider for co-existence. For this reason interference analysis of current GNSS signal is the most needed requirement in current scenario. India is developing its own regional navigation systems named as Indian Regional Navigation Satellite System (IRNSS).An in-house tool is developed with suitable Graphic User Interface (GUI) which provides static analysis of different type of interference parameters and indicates its compatibility with already existing signals. Using the tool, this...

Research paper thumbnail of Modified CEMIC Scheme for Multiplexing Signals over Single Frequency Band

Proceedings of the 34th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GNSS+ 2021)

Research paper thumbnail of Navigation Signal Simulator for Performance Analysis of GNSS Signals

Interoperability and compatibility is the main goal for current GNSS systems. A concept of Global... more Interoperability and compatibility is the main goal for current GNSS systems. A concept of Global Navigation Satellite System (GNSS) is to use all navigation system together to provide better capabilities compared with those that would be achieved relying solely on one service or signal. Compatibility, on the other hand, assures that existing GNSS signal is not degrading each other below certain threshold. GNSS provider is concerned about their own signal as well as other signals from different service provider for coexistence. For this reason interference analysis of current GNSS signal is the most needed requirement in current scenario. India is developing its own regional navigation systems named as Indian Regional Navigation Satellite System (IRNSS).An in-house tool is developed with suitable Graphic User Interface (GUI) which provides static analysis of different type of interference parameters and indicates its compatibility with already existing signals. Using the tool, this paper analyzes the degradation in IRNSS signal performance due to various navigation signals in different bands via consideration of parameters such as Power Spectral Density, Root Mean Square (RMS) Bandwidth and Rectangular Bandwidth. A detailed interference analysis of proposed signals is also calculated. In this paper, an attempt is made to analyze & review few suitable navigation signals for IRNSS in various navigation bands.

Research paper thumbnail of Optical Payload Architecture and System Budget Analysis for Inter Orbital Data Relay System

Journal of Spacecraft Technology, 2005

The inter orbital link (IOL) will become an important element in the architecture of future inorb... more The inter orbital link (IOL) will become an important element in the architecture of future inorbit high data rate communication infrastructure. The optical system has the potential to transfer data at very high rate because of the large bandwidthh available at small ...

Research paper thumbnail of Technique for Initialization and Synchronous Setting of Space Vehicle Time with Navigation System Time

Journal of Navigation, 2012

Abstract Satellite Navigation Systems (SNS) provide Position, Velocity and Time (PVT) services. T... more Abstract Satellite Navigation Systems (SNS) provide Position, Velocity and Time (PVT) services. The SNS is required to maintain its own System Time with high accuracy. To set up the precise System Time, each system component should maintain its own time within a ...

Research paper thumbnail of Novel down link rain fade mitigation technique for Ka-band multibeam systems

International Journal of …, 2007

Rain fades at Ka-Band degrades the link quality and performance significantly. Several rain fade ... more Rain fades at Ka-Band degrades the link quality and performance significantly. Several rain fade mitigation techniques for Ka-band satellite systems are being investigated to improve the channel capacity. Methods such as power control and adaptive waveform techniques have been proposed for use in the uplink as they are capable of straightforward implementation. A novel down link power control technique for multi-beam Ka-band system has been proposed in this paper. It is based on the use of multi-port amplifier, which is commonly used for dynamic power sharing of the beams depending upon the traffic. Payload architecture for multi-beam coverage using multi-port amplifiers has been designed for the proposed technique. The simulation results to compensate for the rain fade attenuation of one beam by sharing the unused power from other beams have been presented Copyright © 2006 John Wiley & Sons, Ltd.

Research paper thumbnail of Synthesized Binary Offset Carrier Modulation for Interoperable GNSS L1 Band Signals

Research paper thumbnail of Communication Group (ODCG)

Interoperability and compatibility is the main goal for current GNSS systems. A concept of Global... more Interoperability and compatibility is the main goal for current GNSS systems. A concept of Global Navigation Satellite System (GNSS) is to use all navigation system together to provide better capabilities compared with those that would be achieved relying solely on one service or signal. Compatibility, on the other hand, assures that existing GNSS signal is not degrading each other below certain threshold. GNSS provider is concerned about their own signal as well as other signals from different service provider for co-existence. For this reason interference analysis of current GNSS signal is the most needed requirement in current scenario. India is developing its own regional navigation systems named as Indian Regional Navigation Satellite System (IRNSS).An in-house tool is developed with suitable Graphic User Interface (GUI) which provides static analysis of different type of interference parameters and indicates its compatibility with already existing signals. Using the tool, this...

Research paper thumbnail of Modified CEMIC Scheme for Multiplexing Signals over Single Frequency Band

Proceedings of the 34th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GNSS+ 2021)

Research paper thumbnail of Navigation Signal Simulator for Performance Analysis of GNSS Signals

Interoperability and compatibility is the main goal for current GNSS systems. A concept of Global... more Interoperability and compatibility is the main goal for current GNSS systems. A concept of Global Navigation Satellite System (GNSS) is to use all navigation system together to provide better capabilities compared with those that would be achieved relying solely on one service or signal. Compatibility, on the other hand, assures that existing GNSS signal is not degrading each other below certain threshold. GNSS provider is concerned about their own signal as well as other signals from different service provider for coexistence. For this reason interference analysis of current GNSS signal is the most needed requirement in current scenario. India is developing its own regional navigation systems named as Indian Regional Navigation Satellite System (IRNSS).An in-house tool is developed with suitable Graphic User Interface (GUI) which provides static analysis of different type of interference parameters and indicates its compatibility with already existing signals. Using the tool, this paper analyzes the degradation in IRNSS signal performance due to various navigation signals in different bands via consideration of parameters such as Power Spectral Density, Root Mean Square (RMS) Bandwidth and Rectangular Bandwidth. A detailed interference analysis of proposed signals is also calculated. In this paper, an attempt is made to analyze & review few suitable navigation signals for IRNSS in various navigation bands.

Research paper thumbnail of Optical Payload Architecture and System Budget Analysis for Inter Orbital Data Relay System

Journal of Spacecraft Technology, 2005

The inter orbital link (IOL) will become an important element in the architecture of future inorb... more The inter orbital link (IOL) will become an important element in the architecture of future inorbit high data rate communication infrastructure. The optical system has the potential to transfer data at very high rate because of the large bandwidthh available at small ...

Research paper thumbnail of Technique for Initialization and Synchronous Setting of Space Vehicle Time with Navigation System Time

Journal of Navigation, 2012

Abstract Satellite Navigation Systems (SNS) provide Position, Velocity and Time (PVT) services. T... more Abstract Satellite Navigation Systems (SNS) provide Position, Velocity and Time (PVT) services. The SNS is required to maintain its own System Time with high accuracy. To set up the precise System Time, each system component should maintain its own time within a ...

Research paper thumbnail of Novel down link rain fade mitigation technique for Ka-band multibeam systems

International Journal of …, 2007

Rain fades at Ka-Band degrades the link quality and performance significantly. Several rain fade ... more Rain fades at Ka-Band degrades the link quality and performance significantly. Several rain fade mitigation techniques for Ka-band satellite systems are being investigated to improve the channel capacity. Methods such as power control and adaptive waveform techniques have been proposed for use in the uplink as they are capable of straightforward implementation. A novel down link power control technique for multi-beam Ka-band system has been proposed in this paper. It is based on the use of multi-port amplifier, which is commonly used for dynamic power sharing of the beams depending upon the traffic. Payload architecture for multi-beam coverage using multi-port amplifiers has been designed for the proposed technique. The simulation results to compensate for the rain fade attenuation of one beam by sharing the unused power from other beams have been presented Copyright © 2006 John Wiley & Sons, Ltd.