Design and Integration of Communication subsystem for Pratham

forestevanescentΗλεκτρονική - Συσκευές

2 Νοε 2013 (πριν από 4 χρόνια και 6 μέρες)

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Department of Aerospace Engineering

IIT Bombay




Contents


Design

of

telemetry,

beacon

and

uplink

modules




Design

and

fabrication

of

final

Onboard

PCBs



Allocation

of

frequencies

by

IARU




Integration

of

Groundstation

at

IITB


Social

Goal




Communication Subsystem

Onboard


Beacon

Telemetry

Uplink

Groundstation

Polarisation

Measurement

Signal
reception

Telemetry Module


CC 1020 daughter
board


Coded by OBC


Data input in the
form of AX.25 packets

Modulates
the signal


RF5110 G with
perpendicular berg
strips and
perpendicular SMA

Amplifies the
signal


Monopole

Radiates the
signal

Beacon Module


Atmega

8
microcontroller to be
used


Morse encoding to be
done by the
microcontroller

Codes the
daughter board


ADF 7020 daughter
board


Transmitting at 144.5
MHz


To be tuned


Duty cycle is 50 %

Modulates the
signal


RF5110 G with
perpendicular berg
strips and
perpendicular SMA

Amplifies the
signal


Monopole

Radiates the
signal

Uplink Module


Monopole

Receives the
signal


SRZ LNA from
RFMD


Satisfies the
operational
parameters


Gain is 30 dB

Amplifies the
received signal


CC 1020 daughter
board


Receiving at 437
MHz


Demodulates after a
certain RSSI value

Demodulates
the signal


Atmega

8
microcontroller to be
used


Decode the kill signal
and pass on to Power

Decodes the
signal

Monopole and Monopole holder



Onboard antenna mounting


Allocation of frequencies by IARU



Conditions for frequency allocation


Amateur

Ham

License

or

a

Custodian



Detailed

link

budget

analysis



Telemetry

sequence


Details

about

the

GS

and

Onboard

circuity

and

their

functionalities


Uplink

or

telecommand

to

control

the

satellite
.


Groundstation

setup:
Polarisation


Crossed
Yagi

mounted on a
rotor controlled
by NOVA and ARS

Antenna


Amplifies the
signals


3 LNA’s to be used

LNA


Takes in 2 feeds


Gives output
corresponding to
polarization angle

AD8032

Groundstation

setup: Telemetry


Crossed
Yagi

mounted on a rotor
controlled with
ARS and NOVA

Antennae


Amplifies the
signal

LNA


Base station to
receive signals


Can be used to
decode the data
packets

Receiver

Social Goal




We have undertaken Social goal as a part of our
Communication Subsystem task.


The Social goal aims to involve universities across the
nation for the purpose of generating a TEC Map of
India.


The readings received from the
Groundstation

can also
be used for the purpose of Tomography of the
Ionosphere.


We have also entered into a collaboration with IPGP
France who shall be
utilising

our TEC data for their
scientific research.

Thank You