Design and Integration of Communication subsystem for Pratham
Design and Integration of Communication subsystem for Pratham 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 Beacon Onboard 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 Amplifies the signal • RF 5110 G with perpendicular berg strips and perpendicular SMA • Monopole Radiates the signal
Beacon Module Modulates the signal • 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 % • RF 5110 G with perpendicular berg strips and perpendicular SMA Amplifies the signal Radiates the signal • Monopole
Uplink Module Amplifies the received signal • Monopole Receives the signal • SRZ LNA from RFMD • Satisfies the operational parameters • Gain is 30 d. B • CC 1020 daughter board • Receiving at 437 MHz • Demodulates after a certain RSSI value Demodulates the signal Decodes the signal • Atmega 8 microcontroller to be used • Decode the kill signal and pass on to Power
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 LNA • Amplifies the signals • 3 LNA’s to be used • Takes in 2 feeds • Gives output corresponding to polarization angle AD 8032
Groundstation setup: Telemetry • Crossed Yagi mounted on a rotor controlled with ARS and NOVA Antennae LNA • Amplifies the signal • 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
- Slides: 13