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STM JOURNALSScientific Technical Medical

May - August 2014

Effect of Atmospheric Aerosol on Lightning Activity Over North East India

Morphological Dynamics of Chilika Lake Inlet Odisha

Performance Analysis of Efficient Channel Coding Schemes

System Design for High Speed Trajectory Changing of A Solar Sail

RRJoSST

Space Science

& Technology

ISSN: 2321-6506

Research & Reviews

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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.

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I hope you will enjoy reading this issue and we welcome your feedback on any aspect of the Journal.

Dr. Archana Mehrotra

Director

STM Journals

Director's Desk

STM JOURNALS

1. Effect of Atmospheric Aerosol on Lightning Activity Over North East India Rakesh Roy 1

2. Morphological Dynamics of Chilika Lake Inlet Odisha Rout J., Ojha A., Tripathy M., Pattnaik A. K., Rajesh G., Samal R. N. 8

3. Performance Analysis of Efficient Channel Coding Schemes for Deep Space and Interplanetary MissionsNanduri P. K., Guven U. 15

4. System Design for High Speed Trajectory Changing of A Solar SailNandu Jith P. J. 22

ContentsResearch & Reviews : Journal of Space Science & Technology

RRJoSST (2014) 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

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

periodsMarch 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) 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

1Chilika Development Authority, Odisha, India

2SPMU-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) 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) 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 probes 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

Research & Reviews Journal of Space Science & Technology(1-7) Effect of Atmospheric Aerosol on Lightning activity (modified)_ed(8-14) Morphological dynamics of Chilika_ed (1)(15-21) Performance Analysis of Channel Coding_ed-1(22-27) System design for High Speed Trajectory Changing of a Solar Sail_ed