IOSR Journal of Electronics and Communication Engineering (IOSR-JECE) e-ISSN: 2278-2834,p- ISSN: 2278-8735.Volume 9, Issue 4, Ver. III (Jul - Aug. 2014), PP 24-29 www.iosrjournals.org www.iosrjournals.org 24 | Page LabVIEWBased Real Time GUI System Development for the studies of Ionospheric irregularities over near Equatorial region at Anantapur using Satellite Radio Beacon signals. K. Jothi Babu 1 , B. Rama Murthy 2 , P. Thimmaiah 3 , K. Tanveer Alam 3 L. Suresh 1 , Mohammad. D.V 4 1 (Al Musanna College of Technology, Al Musanna, Sultanate of Oman) 2 (Department of Instrumentation, Sri Krishnadevaraya University, Anantapur, A.P., INDIA) 3 (Department of Electronics, Sri Krishnadevaraya University, Anantapur, A.P., INDIA) 4 (Department of E&I, AcharyaNagarjuna University, Guntur, A.P., INDIA) Abstract: LabVIEW developed by National Instruments is a graphical programing tool based on the data flow. Due to its characteristics, the recent years it is an ideal tool for both design and implementation of embedded software. This paper presents the development of LabVIEW based Real time GUI system for the studies of variations of percentage of occurrence of VHF amplitude scintillation characteristics using radio beacon signals of 250.649 MHz transmitted from FLEETSAT satellite positioned at 73 o E longitude received over near equatorial station Anantapur(14.7 o N, 77.7 o E, Dip angle 15.4 o N). Already real time digital recording system isexisted, but the disadvantage with the system is inability of the graphical representation of amplitude scintillation patches. Hence , an attempt has been made to overcome this problem with the help of LabVIEW based GUI system for the amplitude scintillations suitable to have data compatibility with Excel and Origin graphical packages for further analysis of the Ionospheric irregularities Scintillation Index (SI),effect of Geomagnetic storms and power spectral variations with amplitude scintillations. The developed system is implemented and executed successfully. Keywords:Ionosphere (Ionospheric Irregularities), Radio Science (Ionosphere Propagation, Space & Satellite Communication), Magnetic Storm, LabVIEW (NI DAQ). I. Introduction LabVIEW is a graphical coding language and provides programming environment based on a data flow model. The main application of it was test, measurement used in industrial automation. At present there has been a tremendous growth in the embedded software systems market and LabVIEW plays a vital role in the reduction of hardware cost and need for fast potable solutions. National Instruments developed LabVIEW RT (Real Time) to answer these demands [1][2]. The main objective of the present work using the LabVIEW RT software and hardware environment for developing real time GUI system [3] to investigate the characteristics of VHF amplitude scintillations for the studies of Ionospheric irregularities over near equatorial region. The Radio wave communications are often subjected to marked changes in their performance owing to changes in the Ionosphere. The Ionospheric scintillations refer to random, rapid irregular and fast fluctuations in various parameters viz amplitude, phase as well as frequency shift of radio waves of VHF to L based transmissions from satellites received at the earth surface, whenever it is propagated through the medium which is non-homogenous in electron density(i.e. embedded with ionospheric irregularities [3][4].In addition the ionospheric scintillations are controlled by irregularity amplitude (ΔN/N), background electron density N and its distribution in the ionosphere[5][6][7]. In the present work the LabVIEW based real time GUI system developed for recording the time amplitude scintillations and the data stored in a file further analysis with the graphical packages like Excel, Origin graphical packages etc. by replacing the existing real time data acquisition system developed in C language having disadvantages inthe graphical representation. II. Hardware Implementation The block diagram of the LabVIEW based GUI system for the studies Ionospheric irregularities is shown in figure 1 consists of the following units. They are 2.1. Antenna System 2.2. Frequency down counter 2.3. ICOMM communication receiver. 2.4. Digital data acquisition system.