DIY Comms and Control for Amateur Space: Talking and by Sandy Antunes

By Sandy Antunes

Radio spectrum for commanding and recording from our satellites is a shared source with sophisticated hurdles. We stroll the trail initially paved via AMSATs to debate the stairs and licensing had to manage and function either a command uplink and an information obtain station and community. learn how enjoying well with others maximizes your skill to get your facts down.

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38 DIY Comms and Control for Amateur Space 3/Full Ground Station What is your mission producing? Why, it’s producing Mission Data. This includes health and safety telemetry—which your customers couldn’t care less about. Primarily, they want the payload or instrument data. Processing this data and generating useful technical or scientific data is what you (or your customer wants). Missions often split into a Mission Operations Center (MOC) that operates and maintains the health of the satellite and handles communications uplinks and downlinks, and a separate Science Operations Center (SOC) that receives the payload/ instrument data from the MOC and distributes it to customers.

The open source public release was March 2015, but CFS is already used on existing missions such as the Global Precipitation Measurement (GPM) mission and the Lunar Atmosphere and Dust Environment Explorer (LADEE) mission. APRS The Automatic Packet Reporting System (APRS) is one of the most brilliant aspects of ham radio. APRS is a worldwide net- 34 DIY Comms and Control for Amateur Space working of radio users, automated stations, repeaters, relays, and the Internet that serves to capture and relay APRSidentified packets to anyone, in near real time.

This is why an ambulance siren appears to rise in pitch as it approaches, then drops in pitch as it departs. The Doppler shift affects any wave, including sound, radio, and light. Since we are communicating using radio waves from a rapidly moving satellite (7 to 11 kilometers per second for most orbits), any transmission from your satellite will deliver a Doppler shift as it moves towards you (from the horizon towards directly above) then away from you (from directly above to the horizon). This will change the broadcast frequency, depending on the mission, anywhere from 1 KHz to 5 Mhz in frequency.

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