PSAT PSAT-2 Remote Data & Comms Transponder 2015 Smallsat Cubesat Conference, Utah Bob Bruninga WB4APR US Naval Academy Satellite Lab bruninga@usna.edu Ocean Buoys w/ RF Terminals Title Name of ParkinsonSAT is in honor of Dr Parkinson of GPS fame and a USNA grad Shortened to Psat… GROUND STATION A satellite relay channel for Amateur Satellite User data anywhere on earth. PSAT

Ground Terminal Applications Focus (force tracking and text-messaging) Quicker Student involvement using a Ground Terminal Operational Concept Ground Terminal Applications Focus (force tracking and text-messaging) Supports Student Experimenters School missions/movements Theater area communications and Emergency Response Comms APRS tracking of course, plus remote data sensing, emergency comms drills, And travel/expedition remote data access. The transponder can also be used by emergency response volunteers such as the Military Affiliate Radio System (MARS). Other educational users have access Education Force Multiplier! APRS Global data network 6/25/2018 6/25/2018 2

Solution: Ground Terminal Applications Focus Supports Student Experimenters world wide OR OR Mobile and HTradios serve as Ground Terminal Equipment. GPS gives “tracking” position data. Other sensors give other data OR OR

APRS Local & Global Internet linked Data Network The APRS Internet captures all packets heard by anyone anywhere and makes them available to anyone This permits Text Messaging between any/all systems also connected to the internet APRS Global Packet Radio Network Internet Linked for live Communications Automatic Packet Reporting System APRS Global data network 6/25/2018

Arctic Buoy Student Experiment USNA Arctic Buoy deployed March 2012 The APRS piece

Example Remote Sensors using APRS Protocol Very Simple APRS transmitter GPS Typical student “near-space” experiments use the system for Balloon payloads. COTS amateur radio transponders readily available.

Why We Need Psat Satellite Transponders Transatlantic APRS balloon launched and tracked through terrestrial network Lost comms over Atlantic Ocean It could have been picked up by our Psat/Pcsat transponder or the ISS

Global Wilderness Areas (90% of Earth) M0XER-3, 4 and 6 Live Global APRS Balloon Tracking Web Page

Hand-Held Satcom via APRS & Psat Ground Terminal is Walkie-Talkie, and Palm Pilot “When you have no comms, 1200 baud text/data is great!” CAPT Chas Richard To Quote the skipper of the USS Parche.. (red above) “ *** “ In this photo, The skipper, Ops bos and Chief Engineer and our Ensign Scrabeck are shown here Using their handheld PCSAT ground terminal. (which is independent of all the other antennas shown) APRS Global data network 6/25/2018 6/25/2018 9

MAREA* Rover Projects ( ARRL) STEM School projects Excite kids with Robotics Drive anywhere on Earth! Via APRS links *http://www.arrl.org/marea-ham-radio-robotics

Psat APRS Network Architecture Many of these IGates are tuned to the APRS Satellites too. Global Volunteer Ground Station Network Internet Linked for live Telemetry APRS Global data network 6/25/2018

Remote Buoy Baseline Test – Success of 1 min Xmit rate This chart summarizes the number of packets heard from a floating buoy operating at 5 watts once every 2 minutes. As many as 11 reports per day were received when both PCSAT1 and PCSAT2 were active at the same time. Wne PCSAT1 died again, then only the packets via ISS got through. But still, a few per day. APRS Global data network 6/25/2018 6/25/2018 12

Tracking (on Google Earth) Map.findu.com/wb4apr* http://aprs.fi Tactical situational awareness Since all data is injected live into the internet by volunteer groundstations, Numerous data mining applications have been developed, especially Google maps and satellite views

Findu.com Telemetry Plots Live Example: www.aprs.org/wb4apr-15.html IN addition to position,course, speed, status, text and messages, remote telemetry can also be transmitted. Such data is automatically archived by the internet system and available at any time from any browser Even without prior arrangement! This shows a year of ANDE satellite telemetry captured by APRS

Dual Hop Operations with PCSAT-1 and PCSAT2: This was the longest 2 hop DX via PCSAT1 and PCSAT2 APRS Global data network 6/25/2018

APRS Global data network All on 145.825 MHz 1990 With all APRS transponder satelites on the same frequency, there can be multiple hops! Trans-Atlantic communications possible through satellite-to-satellite communications See live downlink on http://pcsat.aprs.org and www.ariss.net APRS Global data network 6/25/2018

APRS Global data network Huge reduction from transponders on PCSAT’s 1,2, ANDE and RAFT missions Psat USNA-0601 Earlier reductions to 5” cubesat on RAFT (2006) 4:1 Read TITLE First by a factor of 4 on RAFT (which were deployed from ISS in 2006) And now by a factor of 18 or more for our CUBESAT design. Now reduced 18:1 in volume/mass for 4” cubesat 2009 APRS Global data network 6/25/2018 6/25/2018 17

APRS Global data network A single 3” Square card AX.25 145.825 MHz Mission: Remote Data Relay, Data Exfiltration, Remote Sensor Relay Benefit: Support Space Education on the ground through space applications and student experimental access Hardware: VHF simplex data Xsponder 145.825 MHz Size/Mass: < 10 cu.in (1 PCB 3.4” square), <0.1kg Power: < 1W orbit average, 5 volts. Integration Requirement: Simply, on/off (or *) Structure Impact: Needs 19” thin wire whip antenna (1 cu.in) Benefit to Spacecraft: High visibilty to worldwide educational institutions, fosters collaboration, orders of magnitude greater student experimental access to space systems (ground segment). * Independent back-up telemetry command/ control channel, RS232 serial data, 16 on/off discretes, backdoor reset capability. Worldwide Telemetry Beacon access via global station network. Here is a summary for potential as an AUX payload on Falconsat-6 APRS Global data network 6/25/2018

APRS Global data network A single 3” Square card AX.25 145.825 MHz $5000 New Board Layout – Standard Comm board $250 Here is a summary for potential as an AUX payload on Falconsat-6 APRS Global data network 6/25/2018

Psat-1 Transponder & Aux Payload 75% Payload Space Available! (only 50% shown here) 18 cu.in for Transponder External 19” whip antenna 68 cu.in for Aux Payload (SPMS?) Aux payload gets 4” external panel Aug payload gets .5 kg – self contained 1 to 3W average power for aux payload The mechanical design allows for the additional clean integration of more than half of the volume for an AUX payload. The challenge is getting the Moments of intertia maximized along the Z axis for a stable sun pointing spin. Full sun power is 5.5 Watts, 1 to 3 watts is available for auxilliary payloads. APRS Global data network Vandegriff 6/25/2018 6/25/2018 20

PSAT-1 Unique Power Attitude and spin Uses only one Z coil for attitude Control Fires only within +/- 20 deg of Equator Solar Panel angle better than 95% power Higher reliability Passive Spin maintenance Differential Radiation Spin

Plenty of Room for more cards For Maximum MOI about Z Batteries to outside for MOI & Shielding Stainless steel belt around everything APRS Global data network 6/25/2018

APRS Global data network 6/25/2018

APRS Global data network When we find the time we are really looking forward to understanding our Solar Radiative Spin system. APRS Global data network 6/25/2018

PSAT: Aux PSK31 Transponder Payload Flew on PCSAT2 on ISS but astronaut broke off HF antenna Flew on RAFT but took 1 kW uplink and negative power budget Now Operational since May 2015 launch of PSAT and BRICsat Both transponders built at Brno Univ, Czech Republic. 28 MHz SSB uplinks 435.350 FM downlink APRS Global data network 6/25/2018

PSAT Nitinol Wire Whip Antennas APRS Global data network 6/25/2018

Wrapping Antennas to one Burn Resistor 2 Orthogonal UHF whips One VHF whip One 6’ HF whip 3rd Enable Switch APRS Global data network 6/25/2018

APRS Ground Station Network Many of these IGates are tuned to the APRS Satellites too. Global Volunteer Ground Station Network Internet Linked for live Telemetry APRS Global data network 6/25/2018 28

APRS Global data network 6/25/2018

APRS FOCUS: “Network Centric” & Remote Sensor Experiments Communications Mission Background APRS is everywhere * (Remote Data Relay) FOCUS: “Network Centric” & Remote Sensor Experiments APRS The APRS transponder is an education multiplier giving student access to space with ground system experiments Zoom in on Colorado Springs and you can see 50 “remote sensors/tactical assets” within 50 miles! This shows the popularity of the Remote Data Reporting mission for experimenters (amateur radio operators and students) 300 stations In 35 miles 35 mi Find any station, Any map, Anywhere- http://aprs.fi

APRS Terrestrial Data Relay Network Supports over 20,000+ terrestrial users and experimenters. Read the 1st bullet… then … this map shows the number of USA users and experimenters that use our AX.25 data channel terrestrially… but any of these users can switch to our uplink with a click turn of their frequency knob. As an example, The Mars Society was an educational arctic outpost that has used our system … Read last bullet But stops at the shoreline and has huge holes in the wilderness APRS Global data network 6/25/2018 6/25/2018 31

There are terrestrial network holes everywhere Just like cell coverage, Maybe 70% of USA users are actually out of range of the terrestrial network in rural areas And the terrestrial user does not know when the next APRS satellite is in view…