BIT Deoghar & & Shubrank Mukhiya PROBLEMS PROGRESS

PROJECT PLAN Divided in 4 parts – Simulation, Fabrication and Characterization of Antennas – Design and Fabrication of Tracking Mechanism – Integration of antenna assembly and devices (LNAs, AD 8302 and a computer) – Testing and real-time operation (once the sat is launched) Timeline – May 2011 to Sept 2011 (max 5 months) Funds Sanctioned – Rs 30,000/- in January 2011

Literature reading Concept studying Learning simulation software – HFSS (High Frequency Structure Simulator) Brainstorming on tracking design PROGRESS

1.Simulations 2.Tracking System PROBLEMS

SIMULATIONS  Choice of simulation s/w  We are supposed to simulate on NEC, why not standard s/w such as HFSS, IE3D or CST Studio??  Because – 1.Open source 2.Reliable simulation results

 Simulation results depend on ‘actual’ parameters  From theory, we can deduce the lengths and the spacing of the yagi elements  In addition, we need to input parameters like the diameter of the elements, conductivity of the type of material used etc.  These are subject to availability in market  If these parameters are assumed initially and then the Yagi is constructed to the dimensions of the design, then there stands a possibility that the characterization results will not match that of the design.  SOLUTION : After the characterization results. We’ll adjust the antenna physically to match the specs we need.

For Example : The Folded Dipole In design – Square edges In practice – round edges

Objective: To design a tracking system which can track the satellite along its orbital trajectory Has to be fully automated (obviously) INFORMATION AT HAND : 10:30 AM-PM Polar LEO Altitude : 817 kms TRACKING SYSTEM Enough data to precisely locate the satellite

Tracking system dependent on the terrestrial location of the GS 2D tracking Keeping the budget in mind : Motors will be used to steer the antennas (NOT ROTOR) This increases the complexity of the tracking design (the mechanical design)

Accuracy of tracking should be such that we receive atleast -110 dB signal Polarization readings depends on the orientation of the Yagi Summary 1.2D tracking 2.Use of motors DRIVING FACTORS

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