Supersonics, RF Harmonics, Digital Electronics and Teddy Bears A - - PowerPoint PPT Presentation

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Supersonics, RF Harmonics, Digital Electronics and Teddy Bears A - - PowerPoint PPT Presentation

Aug 15, 2023 120 likes •566 views

Supersonics, RF Harmonics, Digital Electronics and Teddy Bears A Cambridge University Wireless Society & Caius Engineering Society talk by CU Spaceflight Henry Hallam M HMH Ed Moore M TEK Fergus Noble M NBL Thursday 5 March

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Supersonics, RF Harmonics, Digital Electronics and Teddy Bears

A Cambridge University Wireless Society & Caius Engineering Society talk by

CU Spaceflight

Henry Hallam MØHMH Ed Moore MØTEK Fergus Noble MØNBL

Thursday 5 March 7.00pm Bateman Auditorium, Caius College

G6UW

CUWS

Free entry – All welcome

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Assumption: Reaching space is expensive and difficult Is it?

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3 programmes

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Nova

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Latex Balloon

Explosive link thing Parachute Payload Antenna Banana

Nova

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Flight Computer

USB Microcontroller (ARM7) Memory Card

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Flight Computer (reverse)

GSM Modem GPS

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How do we know where it is?

GPS Receiver Flight Computer Radio Transmitter Us on the ground

?

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Digital Communications

Phase-shift keying (PSK) Frequency-shift keying (FSK)

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Decoding FSK

e.g. Radio Teletype (RTTY)

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Decoding FSK

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Decoding FSK

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Can we do any better?

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Multiple Frequency-shift keying (MFSK)

e.g. DominoEX - uses 18 different frequencies

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Getting Involved

Free Decoding Software - FLDIGI

434.650 MHz LSB: RTTY 50-baud 7-bit ASCII DominoEX 22

$$Badger,4528,12:23:06,52.2135,0.0964,28320,2,0,1

Callsign Seconds since launch Time Latitude Longitude Altitude more details at www.cuspaceflight.co.uk

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Nova Aurora

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‘Zero Pressure’ Balloon

Aurora

Rocket

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Long duration, Long distance

434 MHz - L.O.S, small antennas 14 / 3.5 MHz - over the horizon, long distance

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DDS: Direct Digital Synthesis

~ £10 Max Clock 400MHz Max signal (Nyquist) 200MHz

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Fundamental signal Clock Freq = 364.8 MHz Fundamental signal = 70MHz 364 + 70 = 434 MHz Nyquist Limit

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§

Nova Aurora Martlet

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Martlet

Main Parachute Avionics Drogue Parachute Motor

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COCOM limit Martlet Altitude 60,000 ft 300,000ft Velocity 1000 kts 3000 kts Acceleration 4 G 50 G

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Thermal Noise Floor

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Acquisition

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100Hz Naviagtion Output data

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Questions?

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Questions?

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Questions?

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Questions?

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Questions?

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Questions?