RRJoSST
ISSN: 2321-6506
(RRJHS)
Research & Reviews Journal of
Space Science & Technology
Volume 1, Issue 1-3 Compilation 2012
May - August 2014
Ÿ Effect of Atmospheric Aerosol on Lightning Activity Over North East India Ÿ Morphological Dynamics of Chilika Lake Inlet – Odisha Ÿ Performance Analysis of Efficient Channel Coding Schemes Ÿ System Design for High Speed Trajectory Changing of A Solar Sail
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I take the privilege to present the hard copy compilation for the [Volume 3 Issue (2)] of Research & Reviews : Journal of Space Science & Technology (RRJoSST). The intension of RRJoSST is to create an atmosphere that stimulates creativeness, research and growth in the area of Space Science & Technology. The development and growth of the mankind is the consequence of brilliant Research done by eminent Scientists and Engineers in every field. RRJoSST provides an outlet for Research findings and reviews in areas of Space Science & Technology found to be relevant for National and International recent developments & research initiative. The aim and scope of the Journal is to provide an academic medium and an important reference for the advancement and dissemination of Research results that support high level learning, teaching and research in the domain of Space Science & Technology. Finally, I express my sincere gratitude and thanks to our Editorial/ Reviewer board and Authors for their continued support and invaluable contributions and suggestions in the form of authoring writeups/ reviewing and providing constructive comments for the advancement of the journals. With regards to their due continuous support and co-operation, we have been able to publish quality Research/Reviews findings for our customers base. I hope you will enjoy reading this issue and we welcome your feedback on any aspect of the Journal.
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Research & Reviews : Journal of Space Science & Technology
Contents
1. Effect of Atmospheric Aerosol on Lightning Activity Over North East India Rakesh Roy 2. Morphological Dynamics of Chilika Lake Inlet – Odisha Rout J., Ojha A., Tripathy M., Pattnaik A. K., Rajesh G., Samal R. N.
1
8
3. Performance Analysis of Efficient Channel Coding Schemes for Deep Space and Interplanetary Missions Nanduri P. K., Guven U.
15
4. System Design for High Speed Trajectory Changing of A Solar Sail Nandu Jith P. J.
22
Research & Reviews: Journal of Space Science & Technology ISSN: 2321-2837 (online), ISSN: 2321-6506 (print) Volume 3, Issue 2 www.stmjournals.com
Effect of Atmospheric Aerosol on Lightning Activity Over North East India Rakesh Roy* Department of Physics, National Institute of Technology Agartala, Tripura (West)-799 055, India Abstract The observations of the lightning activity variation from 1998 to 2011 due to atmospheric aerosol effect over the North East India have been reported here. It has been observed that the lightning activity increases very rapidly in this region with a rate of 867 lightning flashes per year. Lightning activity over this region mainly occurs in two periods—March to June and August to October every year. As the higher lightning activity occurs during March to June months, i.e., mainly during the Monsoon season, correlation has been found between lightning activity and convective activity. Good correlation has been observed with lightning upto the year 2009, after that lightning activity increases suddenly in the year 2010 and then again decreases. In further analysis, it is observed that the aerosol activity increases very significantly between 2009 and 2011 and may be the reason for increasing the lightning activity over this region in around 2010.
Keywords: Lightning , convective available potential energy, aerosol optical depth
RRJoSST (2014) Š STM Journals 2014. All Rights Reserved
Research & Reviews: Journal of Space Science & Technology ISSN: 2321-2837 (online), ISSN: 2321-6506 (print) Volume 3, Issue 2 www.stmjournals.com
Morphological Dynamics of Chilika Lake Inlet – Odisha Rout J.1, Ojha A.2*, Tripathy M.1, Pattnaik A. K.1,2, Rajesh G.1, Samal R. N.1 1
Chilika Development Authority, Odisha, India 2 SPMU-ICZMP, Odisha, India
Abstract Due to erosion and/or sedimentation of Chilika Lake Inlet Dynamics could be studied by using the Satellite images. Satellite imagery has an important role in studying the dynamics of the inlet. The current study was carried out to investigate spatio-temporal inlet dynamics due to erosion and/or sedimentation by using Remote Sensing and GIS Technique. The study period is between the year 2008 and 2014 of Chilika Lake because in this period Lake inlet extremely dynamic and unstable. During these 6 years the inlet has migrated 1.5 km towards North direction and also three new natural inlet open and one has also merge with old inlet.
Keywords: Dynamics, Satellite, Spatio-temporal, Remote Sensing, GIS
RRJoSST (2014)Š STM Journals 2014. All Rights Reserved
Research & Reviews: Journal of Space Science & Technology ISSN: 2321-2837 (online), ISSN: 2321-6506 (print) Volume 3, Issue 2 www.stmjournals.com
Performance Analysis of Efficient Channel Coding Schemes for Deep Space and Interplanetary Missions Nanduri P. K.*, Guven U. Department of Aerospace Engineering, University of Petroleum and Energy Studies, Dehradun, India Abstract This paper discusses about the space communication challenges – especially deep space communications with a detailed analysis on channel coding techniques and modulation schemes. It explains about the free space loss (FSL) that occurs due to the presence of long distances (in terms of Astronomical Units) in AWGN channel with relation to the power transmitted and power received. Also, it discusses different kinds of digital modulation techniques employed in tandem with the algebraic channel coding schemes. The discussion in this paper is confined to algebraic coding schemes and probabilistic coding schemes, as such, are not give a detailed look. Convolutional - hard and soft, Hamming, Golay, Reed-Solomon are compared and their noise combat ability is discussed in detail using the help of computer based simulations in MATLAB and SIMULINK. It is shown that low BERs can be achieved at very small Eb/N0 ratios using OQPSK, MSK, and GMSK techniques. Robust coding schemes for space communications are given an overview. All the codes and modulation schemes are compared and analyzed for an AWGN channel. Also an introduction to quantum communication is discussed with reference to coding schemes.
Keywords: FSL, Hamming codes, BER, QPSK, Golay codes
RRJoSST (2014)Š STM Journals 2014. All Rights Reserved
Research & Reviews: Journal of Space Science & Technology ISSN: 2321-2837 (online), ISSN: 2321-6506 (print) Volume 3, Issue 2 www.stmjournals.com
System Design for High Speed Trajectory Changing of A Solar Sail Nandu Jith P. J.* Amity Institute of Space Science and Technology, Amity University, Noida (U.P.), India Abstract Solar sails were created as a new form of satellite propulsion which uses the radiation pressure of the light from the stars or a laser to push ultrathin mirrors to high speeds. The new design incorporates ablative laser propulsion for trajectory changing of the probe at a desired point in space to be maneuvered towards the desired object. The design provides a combination of sail propulsion and laser propulsion systems to create the desired effect on to the path of a satellite or a probe. The solar sail will be used as a constant source of thrust during the probe’s journey to the intended target and the laser propulsion system will be only activated during its final stretch of its journey for major trajectory changing and positioning of the probe on to the target.
Keywords: Solar Sail, High Speed Trajectory Changing, Space Exploration, Ablative Laser Propulsion
RRJoSST (2014)Š STM Journals 2014. All Rights Reserved