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Thangadurai, N.
- Positioning and Signal Strength Analysis of IRNSS and GPS Receiver in Plain Terrain along with Foliage Loss
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Authors
Affiliations
1 Department of Electronics and Communication Engineering, School of Engineering and Technology, Jain University, Bengaluru 562 112, IN
1 Department of Electronics and Communication Engineering, School of Engineering and Technology, Jain University, Bengaluru 562 112, IN
Source
Current Science, Vol 112, No 08 (2017), Pagination: 1738-1742Abstract
Navigation systems such as Global Positioning System (GPS) play a significant role in determining the user position. Similar to GPS, Indian Regional Navigation Satellite System (IRNSS) is a navigation system indigenously developed by India to meet the country's needs. Presently, six satellites are in orbit - three in inclined geosynchronous orbit and three in geostationary earth orbit. It is essential to evaluate and upgrade the performance of IRNSS continuously for various applications. One such assignment to characterize the performance of IRNSS is mapping of the Jain University global campus geographical area in Bengaluru. The area for mapping includes a terrain with different features such as plain fields, vegetation fields, power distribution substation, dense trees and a terrain with variation in altitude. The purpose of this study is to analyse the performance of both IRNSS and GPS with respect to carrier-to-noise ratio, altitude variation, satellite visibility and GDOP, and the corresponding observations are recorded and plotted with available maps.Keywords
Altitude Variation, Navigation System, Satellite Visibility, Vegetation Effect.Full Text
References
- ISRO, Indian Regional Navigation Satellite System Signal In Space ICD for Standard Positioning Service (Version 1.0, ISRO-IRNSSICDSPS-1.0), Indian Space Research Organization, 2014.
- Xu, G., GPS Theory, Algorithms and Application, Springer Verlag, 2nd edn, 2007.
- Chandrasekar, M. V. et al., Modernized IRNSS broadcast ephemeris parameters. J. Control Theory Inf., 2015, 5(2).
- ISRO, Indian Regional Navigation Satellite System Navigation Software Design Document, ISRO-ISAC-IRNSSRR-0900.
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- Rao, V. G., Lachapelle, G. and Vijay Kumar, S. B., Analysis of IRNSS over Indian Subcontinent. J. Inst. Navigation, San Diego, 2011.
- Ganeshan, A. S., Rathnakara, S. C., Gupta, R. and Jain, A. K., Indian regional navigation satellite system (IRNSS) concept. ISRO Satellite Centre J. Spacecraft Technol., 2005, 15(2), 19–23.
- Surendra Pal, Ganeshan, A. S., Rao, K. N. S. and Mruthyunjaya, L., Indian Regional Navigation Satellite System. In Proceedings of the 58th International Astronautical Congress, International Space Expo, Hyderabad, 2007.
- Smith, D. A., The future of global navigation satellite systems: anyone, anywhere, anytime, any accuracy by 2027; http:// celebrating200years.noaa.gov/visions/gnss, 2012.
- Development of 90 GHz Microwave Radiometer Sensor in Snow/ice Studies Over the Himalaya as Input for Disaster Monitoring
Abstract Views :178 |
PDF Views:31
Authors
Affiliations
1 Department of Electronics and Communication Engineering, School of Engineering and Technology, Jain (Deemed-to-be University), Bengaluru 562 112, IN
1 Department of Electronics and Communication Engineering, School of Engineering and Technology, Jain (Deemed-to-be University), Bengaluru 562 112, IN
Source
Current Science, Vol 116, No 10 (2019), Pagination: 1715-1720Abstract
In this study, a sensor is designed based on a basic radiometer system at 18.8 GHz for ground-based testing and operations. Initially a generic radiometer will be designed in total power radiometer configuration (Phase 1) that is more appropriate for remote sensing platforms for operations in a campaign mode, such as an airborne mission. The same radiometer is proposed to be modified as a null-balancing Dicke radiometer (Phase 2) that is more suitable for long-term field operations over a range of temperatures and environmental conditions. This system is also useful for long-term propagation experiments in communication. The development of a millimeter-wave radiometer is in several hardware realization phases identified as Phases 1 and 2. The present proposal is expected to facilitate realization and utilization of microwave radiometers for space applications. The team at Jain University, Bengaluru will complement activities at ISRO in remote sensing applications through any campaigns proposed by the latter. Any future incremental development activities such as augmentation at higher frequencies as well testing newer concepts such as phased-array antenna for electronic scanning at lower frequencies, dichroic antennas at very high frequencies, etc. may be attempted based on the trends in technology/hardware.Keywords
Disaster Monitoring, Microwave Radiometer, Remote Sensing, Snow/Ice Studies.Full Text
References
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- Thangadurai, N. and Vasudha, M. P., A review of antenna design and development for Indian Regional Navigational Satellite System. In Proceedings of IEEE International Conference on Advanced Communication Control and Computing Technologies, Ramanathapuram, 2016, pp. 299–306.
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- Composition of Magnetic Tunnel Junction-Based Magnetoresistive Random Access Memory for Field-Programmable Gate Array
Abstract Views :149 |
PDF Views:31
Authors
Affiliations
1 Electronics and Communication Engineering Department, Jain (Deemed-to-be University), Bengaluru 560 112, IN
2 Electronics and Communication Engineering Department, NMAMIT, Nitte, Udupi 574 110, IN
1 Electronics and Communication Engineering Department, Jain (Deemed-to-be University), Bengaluru 560 112, IN
2 Electronics and Communication Engineering Department, NMAMIT, Nitte, Udupi 574 110, IN
Source
Current Science, Vol 119, No 1 (2020), Pagination: 119-123Abstract
In this study, the schematics for Magnetic Tunnel Junction-Magnetoresistive Random Access Memory (MTJ-MRAM) are designed and simulations are carried out in 45 and 90 nm Complementary Metal-Oxide Semiconductor (CMOS) Very Large Scale Integration (VLSI) technology using analog design environment. Other memory circuits like volatile Static Random Access Memory (SRAM) and non-volatile flash memory are designed and behavioural waveforms verified. The output behavioural characteristics of MTJMRAM are compared with that of SRAM and flash memory. The attributes like power and delay are calculated and compared with SRAM and flash memory circuits. The study was carried out in order to integrate the non-volatile memory with field-programmable gate array (FPGA) architecture and design a nonvolatile memory-based FPGA. MTJ-MRAM shows better performance than volatile SRAM and nonvolatile flash memory in terms of power and delay parameters.Keywords
Behavioural Waveforms, Field-Programmable Gate Array, Magnetic Tunnel Junction, Memory Circuits.Full Text