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Design, implementation, and preliminary tests of the emergency beacon transmitter of the OUFTI-1 nanosatellite of the University of Liège, as of March 2013

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Design, implementation, and preliminary tests of the

emergency beacon transmitter of the OUFTI-1

nanosatellite of the University of Liège, as of March 2013

Architecture

Prototype

Functions

Modulator

Nicolas Crosset

+

, Xavier Werner

+

, Jonathan Pisane

+

, Amandine Denis°, Valéry Broun

$

, Jacques G. Verly

+

+

Dept. of EECS, University of Liège; °LTAS, University of Liège, BELGIUM ;

$

Engineering Dept., HEPL

• The beacon transmits a Morse code message

consisting of a header and some key measurements. • The Morse code message is converted into an

analog waveform driving an AM modulator

• The transmitter is always ON except if shut down from ground

• The operating frequency is 145.980 MHz

µC A (MSP430) µC B (MSP430) PORT 4 UART 1 PORT 4 UART 1 ADC (PORT 6) PORT 1 ADC (PORT 6) PORT 1 8 measurements 8 status bits 8 status bits 8 measurements C o nt ro l D at a Mod A (RF2516) Mod B (RF2516) Frame Frame Ampli A (AH117) Ampli B (AH117) Combiner Combiner

From COM subsystem

On/off On/off 10 dBm 10 dBm 26 dBm 26 dBm 23 dBm 20 dBm Filter

145.980 MHz

Analog Digital RF H I H 50 µs

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