Upload
alyssa-clarke
View
24
Download
2
Embed Size (px)
DESCRIPTION
ARBONET. ARBONET. “A poor man’s space program” Primarily funded and spear-headed by: Doug Loughmiller – W5BL Michael Willett – K5NOT With support from several enthusiastic individuals and clubs. ARBONET. Local Clubs Involved with ARBONET: - PowerPoint PPT Presentation
Citation preview
ARBONET
“A poor man’s space program”
Primarily funded and spear-headed by:Primarily funded and spear-headed by:Doug Loughmiller – W5BLDoug Loughmiller – W5BLMichael Willett – K5NOTMichael Willett – K5NOT
With support from several enthusiastic individuals With support from several enthusiastic individuals and clubs and clubs
ARBONET
Local Local Clubs Involved with ARBONET:Clubs Involved with ARBONET:
• North Texas Balloon Project (mentors / chasers)North Texas Balloon Project (mentors / chasers)• Red River Valley Amateur Radio Club (NE TX)Red River Valley Amateur Radio Club (NE TX)• Fannin County Amateur Radio Club (NE TX)Fannin County Amateur Radio Club (NE TX)• Lockheed Amateur Radio Club – Ft. WorthLockheed Amateur Radio Club – Ft. Worth• Richardson Wireless Klub (guest payloads)Richardson Wireless Klub (guest payloads)• Irving Amateur Radio ClubIrving Amateur Radio Club
ARBONET
Adventures:
GPSL-2009
Aka: Which way did it go?
GPSL 2009Arrived with payloads ready and willing to go flying, but…. Became “enlightened” by Bill Brown… “ The Copernicus GPS has issues and settings you need to address…”
We did not drive all the way up here to sit on the sidelines…. So we flew anyway!
We thought we would at least have Lat / Long… And…. After the radio batteries were depleted…..
ARBONET
Our payload was found a week later in grazing land by ranchers in Redland, KS.
After reward money and postage, the payload came back to Texas!
During the recovery, Doug and I never laughed so hard, making fun of the female voice beacon who talked a lot and yet said so little!
ARBONET
0100020003000400050006000700080009000
100001
4
35
55
85
11
5
13
5
16
5
19
5
Alitutude (m)
Temperature
Pressure
ARBONET
29,616 ftLast Valid GPSData Point
Max altitude obtained estimated by Bill Brown WB8ELK as about 110,000 feet
ARBONETGPSL 2009 Flight
Configuration
Balloon
Manifold Pressure Sensor Feed
ElectronicsValve (closed for this flight)
Parachute(Intended to be closed for flight)
6 Minute Video
ARBONET flight at GPSL 2009
Interesting Data:
Envelope Pressure
ARBONET
• If P is nearly static, F /A are not changing or equal in change• If P increases, F is increasing or A is decreasing• If P decreases, F is decreasing or A is increasing
P = F/A
Where P = PressureWhere F = ForceWhere A = Area
ARBONETGPSL 2009 Flight
Configuration
Balloon
Manifold Pressure Sensor Feed
ElectronicsValve (closed for this flight)
Parachute(Intended to be closed for flight)
ARBONET
Pressure Sensors:
Measured Pressure = Ambient Pressure
More Pressure
Diaphragm Diaphragm
Ambient Air Ambient Air
Diaphragm Diaphragm
Ambient Air Ambient Air
Balloon Balloon
ARBONETP=F/A
Rs
-10
0
10
20
30
40
50
60
70
80
90
14 15 25 35 45 50 55 65 75 85 95 105
115
120
125
135
145
155
165
175
185
195
197
Burst
Pressure
TemperaturePressure
Internal TemperatureOf Payload
ARBONET
• We tend to think balloons behave in a linear fashion since the ascent is nearly linear. Thus a balloon that is getting bigger should have equal or more pressure…
• We found the behavior is not linear, but a balance of P=F/A that was not expected
• Other factors also contribute – He impurities, point of measurement, etc.
• The Latex stretching is not linear, and the “mechanical maximum” (ability to contain the gas within) has a limit that is recognizable just before burst!
ARBONET
-5
0
5
10
15
20
25
30
35
40
45
50
ARBONET Envelope Pressure relative to ambient
(not calibrated )
This area may actually become a vacuum per similar results from U of MN students
ARBONET
-5
0
5
10
15
20
25
30
35
40
45
50
Envelope Pressure relative to ambient
(not calibrated )
To modulate the optimum envelope pressure, we need to detect and remain in this region
ARBONET
Possible Flight Profile
Phase 1Launch
Phase 4Ascent
Phase 2Ascent
Phase 6Deflation and Return via Balloon
Phase 7Recovery
TIME
ALT
ITU
DE
RDF Tone
80K-100K ft Phase 3Sense return ofPositive pressure Trend and ModulatePressure
Phase 6 Return to Hover(Dump Ballast)
Phase 5Hover
ARBONET
How envelope modulation may be used:How envelope modulation may be used:
• Hang a balloon for longer-term, high-altitude Hang a balloon for longer-term, high-altitude experiments, re-call it when desiredexperiments, re-call it when desired
• A repeater in the sky for long periods of timeA repeater in the sky for long periods of time• Controlled descents and with ballast, possible Controlled descents and with ballast, possible
controlled landings by chase teamcontrolled landings by chase team• Gain higher altitudes, even though the ft/min is Gain higher altitudes, even though the ft/min is
constantly decreasing after maximum expansion, you constantly decreasing after maximum expansion, you are still climbing for many minutes!are still climbing for many minutes!
Note: Likely venting issue if in the zero pressure region!Note: Likely venting issue if in the zero pressure region!
ARBONET
Project 1:Project 1:
New Voice Beacon New Voice Beacon PayloadPayload
The new voice beacon payload:The new voice beacon payload:
• Same lost blonde-sounding women’s voice we all love.Same lost blonde-sounding women’s voice we all love.• Inventek GPS with Sarantel antennaInventek GPS with Sarantel antenna• 0.3 PSI rated pressure sensor (higher precision)0.3 PSI rated pressure sensor (higher precision)• Embedded repeater via 70cm and 2m radiosEmbedded repeater via 70cm and 2m radios• Built in USB for log retrieval and troubleshooting Built in USB for log retrieval and troubleshooting • DS1822 Digital thermometer Internal and ExternalDS1822 Digital thermometer Internal and External• Sensiron Thermometer and humidity measurement device Sensiron Thermometer and humidity measurement device • 2Mb to 4Mb logging memory capacity2Mb to 4Mb logging memory capacity• Separate, controllable power busses for almost all Separate, controllable power busses for almost all
electronics to reduce power consumptionelectronics to reduce power consumption• All on a 3.8 x 2.5 double-sided boardAll on a 3.8 x 2.5 double-sided board
ARBONET
ARBONET VOICE BEACON Design Team :ARBONET VOICE BEACON Design Team :
• Patrick Whitfill, Firmware Guru / Operational Patrick Whitfill, Firmware Guru / Operational AspectsAspects
• Michael Willett, K5NOT, Systems design, Michael Willett, K5NOT, Systems design, Hardware design and JOATHardware design and JOAT
ARBONET
ARBONETThe new voice beacon main board:The new voice beacon main board:
ARBONETThe new voice beacon main board:The new voice beacon main board:
Pgm HdrUSB Hdr
Pressure Sensor
Voice Synthesizer(Backside)
Analog In and Servos
70cmAntenna
GPS
Open Tracker SMT2mAntenna
Power In
CPU andmemory
70 cm radio(backside)
2m radio(backside)
USB Chip(backside)
Each section uses Power Control
ARBONETThe new voice beacon main board:The new voice beacon main board:
ARBONET
ARBONET
Project 2:Project 2:
Slow Scan TV ModuleSlow Scan TV Module
Doug Loughmiller, W5BL – ARBONET
GPSL 2010 Hutchinson, KS
July 23rd, 2010
A look at the OE1RIB Embedded Mobile SSTV for use in High Altitude
Balloon Flights
ARBONET
Design Credit• The concept, design and implementation of the Mobile
Embedded SSTV System is 100% the result of the efforts of Richard Prinz, OE1RIB who has graciously made his design materials available to W5BL for use on upcoming ARBONET flights.
• Doug’s efforts have simply been to identify Richard’s work and to promote his design as a viable solution for a low power, low cost, portable SSTV solution suitable for use as a payload on High Altitude Balloon Flights..
ARBONET
Image Options for High Altitude Balloon Flights
• ATV– Platform Stabilization, limited ground stations
• Digital Photography / Digital Video– Excellent Images, but can only be viewed post flight
• SSTV– Excellent Image quality, downlink in near real-time,
easy ground station solution with receiver, lap-top and shareware
ARBONET
ARBONET SSTV ActivityARBONET
What We Really Want To See!
ARBONET
Commercial, Portable Off-the-Shelf SSTV Options
are Limited
ARBONET
A Novel Home-Brew Solution
• Original Article
Appeared in “Funkamateur” 8/2007• OE1RIB Web Site:
http://www.min.at/prinz/oe1rib/SSTV/#Purpose
ARBONET
Features of The Universal Mobile Embedded SSTV System
• Supports Black and White or Color Images Using Martin 1 with either 320 x 240 or 320 x 256 pixels
• Supports SSTV VIS code, Optional CW station ID• Multiple transmissions of a captured image or
single transmission of multiple images• Battery backed Real-time clock for time and date
display on image or via CW
ARBONET
• Built-in temperature sensor in image display or via CW
• In-circuit Programmable • User defined Font Editor For Status Text
Messages• Configurable via RS-232 Port using HyperTerm-
like serial programs• Small Form Factor• Light Weight
ARBONET
System Image Using Martin1
ARBONET
Circuit Details
• Microprocessor = Microchip PIC18F458• Video Buffer= AverLogic AL422B• Real Time Clock= Maxim DS1307• Temperature Sensor= Microchip TC74• Camera= Sander/ ETC CAM-C3188A• Low Power System operates at 100 mA during
image capture and transmission , 90 mA at idle.
ARBONET
Construction
• Almost all parts are readily available through catalog distributors (Mouser, Digi-key etc.)–Exceptions: Averlogic Frame Buffer, Maxim
MAX1818 and Sanders Camera• Boards can be obtained through ExpressPCB• Software downloadable from the Web site• Some surface mount components
ARBONET
Conclusion
• Ideal Solution for BalloonSat Operations• Thanks to Richard, OE1RIB for Sharing his
design• Stay Tuned for Images from Upcoming
ARBONET flights.• www.arbonet.net
ARBONET
ARBONET