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APRS and Ballooning. Slides by Rick von Glahn, NØKKZ Edge of Space Sciences, Inc. www.eoss.org. APRS. A utomatic P osition R eporting S ystem. Created by Bob Bruninga WB4APR. General APRS Concept. Exchange Location Precisely and Automatically via Radio

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aprs and ballooning

APRS and Ballooning

Slides by Rick von Glahn, NØKKZ

Edge of Space Sciences, Inc.

www.eoss.org

slide2
APRS

Automatic

Position

Reporting

System

Created by Bob Bruninga WB4APR

general aprs concept
General APRS Concept
  • Exchange Location Precisely and Automatically via Radio
  • Map Location of Active APRS Stations
  • Track Moving Stations
basic components
Basic Components
  • Transceiver
  • Terminal Node Controller (TNC/Modem)
  • Computer
  • GPS (Global Positioning System Receiver) optional
advanced components
Advanced Components
  • Currently Kenwood makes an HT that incorporates all basic components with the exception of the GPS receiver
  • Screen Shots

Bearing (arrow in compass) and range the Maidenhead Grid Sq shown too

The Latitude and Longitude of the received station

data transmissions
Data Transmissions
  • Each station programs their system to transmit their location
  • Location can be entered manually or automatically via an attached GPS receiver
ballooning aprs concept
Ballooning APRS Concept
  • Equip Balloon with an APRS station
  • Continuously beacon position and altitude
  • Ground stations receive data
    • Use to track balloon flight
  • I-gates Pass data into the Internet
    • Distant and non-amateur stations can track
    • Federal Aviation Administration Live tracking via Findu.com
data formats
Data Formats
  • APRS – Several Different Formats

N0KKZ-3>APRS:@140003h3936.68N/10402.55WO063/008/A=005230

KG4YLM-11>TPSUVP,RELAY,WIDE:'pYnpr'/>$7R}

  • GPS – Several Different Formats

GGA String

W5VSI-11>APRS:$GPGGA,141740,3841.7501,N,09648.7576,W,1,05,1.06,448.9,M,-27.7,M,,*46

RMC String

W5VSI-11>APRS:$GPRMC,144448,A,3842.0341,N,09648.8991,W,15.694,4.2,060702,5.2,E*51

aprs decoded
APRS Decoded
  • Plain Text Version

N0KKZ-3>APRS:@140003h3936.68N/10402.55WO063/008/A=005230

Altitude

Speed

Symbol Table Switch

Course

Symbol

Time (UTC)14:00:03

Latitude (Degrees and Minutes) 39° 36.68 Minutes North

Longitude104° 02.55 Min West

aprs decoded10
APRS Decoded
  • Compressed Version

KG4YLM-11>TPSUVP,RELAY,WIDE:'pYnpr'/>$7R}

No embedded timestamp

Latitude = 40.593° N

Longitude = -104.03316° W

Altitude = 55,426.51 ft.

Speed = 86 knots

Course = 32.2° True

gps strings decoded
GPS Strings Decoded

W5VSI-11>APRS:$GPGGA,144440,3842.0022,N,09648.8955,W,1,09,1.02,1307.5,M,-27.7,M,,*7B

AltitudeMeters

Latitude 38° 42.0022’ North

Time (UTC)14:44:40

Longitude96° 48.8955’ West

Speed(Knots)

Course

W5VSI-11>APRS:$GPRMC,144440,A,3842.0022,N,09648.8955,W,15.694,4.2,060702,5.2,E*51

Navigation Receiver Warning

A=OK

V=Warning

Date 06-Jul-2002

Magnetic Variation 5.2° East

aprs data preferences
APRS Data Preferences
  • Plain Text over encoded unless time is critical
    • A human being can actually read and interpret the data without the further assistance of a computer
  • Embedded timestamps greatly assist in post flight computations
  • Altitude information is required
programs
Programs
  • Many APRS programs are available
    • APRS-DOS
    • APRS-Plus (Aprs+SA)
    • UI-View
    • APRS-Point
    • WinAPRS
    • Many more
  • Tucson Amateur Packet Radio good source
    • www.tapr.org
examples of aprs sa
Examples of APRS+SA
  • APRS+SA by Brent Hildebrand (KH2Z)
    • Decodes Most Formats of APRS data
    • Exports data to Delorme Street Atlas (+SA) for mapping
    • Displays Messages and Bulletins
    • Displays Weather
aprs sa
APRS+SA
  • Program Screen Shot
aprs sa16
APRS+SA
  • Delorme Street Atlas Map of Data from APRS+SA
aprs sa17
APRS+SA
  • Tracked Moving Station
combining aprs and high altitude ballooning
Combining APRS and High Altitude Ballooning
  • APRS systems are placed on board the balloon and at Ground Stations
  • Allows in flight tracking of the progress of the balloon (both its location and altitude)
  • Greatly enhances probability of quick recovery of balloon systems
using aprs sa to track
Using APRS+SA to Track
  • Screen Shot of the History Tab in APRS+SA showing the flight data
delorme street atlas map
Delorme Street Atlas Map
  • The track of a balloon flight (black line)
  • Track is updated LIVE during the flight
i gating into the internet
I-Gating into the Internet
  • Local Aprs Station with Internet connection must …
    • Receive APRS Data via RF packet radio station
    • Relay that Position data into the internet via I-Gate software
      • UI-View very good I-Gate
      • APRS-Plus can also I-Gate
ui view gating into the net
UI-View Gating into the Net
  • Stations being Igated are being displayed and recorded to a Log File
getting aprs data from the internet
Getting APRS data from the Internet
  • Computer with an Internet connection
  • Either
    • APRS software
    • Web Browser
ui view
UI-View
  • While I-Gating UI-View can still receive data from both RF and the Internet
  • The CW#### stations are all on the internet only and are Citizen’s Weather Stations
browser display
Browser Display
  • Findu.Com display of N0KKZ-1
  • Note Raw Packet and time received data at top of window
faa display
FAA Display
  • APRS reported position relative to VORs
  • Must be pre-arranged with Russ Chadwick (contact EOSS webmaster for info)
  • FAA Loves this capability in the Denver regional center
conclusions
Conclusions
  • APRS greatly enhances the flight experience for observers at the ground station and for anyone monitoring the flight via APRS enabled radio/TNC/computer systems or via the internet
  • APRS gives greater confidence to both Flight Controllers and Tracking and Recovery coordinators with a more precise knowledge of the current balloon trajectory information
  • APRS can be used to keep FAA apprised of your payloads location live via the web (findu.com)
  • APRS increases accuracy and speed in the recovery process
slide29
Balloon Systems Recovered Rapidly
  • Happy Tracking and Recovery Crew
credits
Credits
  • Bob Bruninga (for APRS itself)
    • http://web.usna.navy.mil/~bruninga/aprs.html
  • Brent Hildebrand (for APRS+SA)
    • http://www.tapr.org/~kh2z/aprsplus/
  • Roger Barker G4IDE SK (for UI-View)
    • http://www.ui-view.org
  • Delorme for Street Atlas
    • http://www.delorme.com
  • EOSS Tracking and Recovery Team
    • http://www.eoss.org/eoss_rdf/

This presentation is available at:

http://www.eoss.org/aprs/