GS @ BIT Deoghar

&

Shubrank Mukhiya

PROBLEMSPROGRESS

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. Simulations2. 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 source2. 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 DipoleIn design – Square edgesIn 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

Summary1. 2D tracking2. Use of motors

DRIVINGFACTORS

THANK YOU