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Aircraft Reflections

Aircraft Reflections. Doppler effect on 144 MHz WSPR signal caused by passing aircrafts Allard Munters - PE1NWL pe1nwl@gooddx.net. Aircraft reflections on Wed May 19, 2010 at 1042 UTC and 1054 UTC

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Aircraft Reflections

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  1. Aircraft Reflections Doppler effect on 144 MHz WSPR signal caused by passing aircrafts Allard Munters - PE1NWL pe1nwl@gooddx.net

  2. Aircraft reflections on Wed May 19, 2010 at 1042 UTC and 1054 UTC Horizontally polarised 144 MHz WSPR signal from DL1DBC (Wittingen, JO31oj) as received by PE1NWL (Gouda, JO22ia) – distance 186 km.

  3. reflected wave with positive doppler shift, aircraft moving towards PE1NWL direct wave reflected wave with negative doppler shift, aircraft moving away from PE1NWL 10:42:44 aircraft at nearest position to PE1NWL

  4. PE1NWL 186 km DL1DBC

  5. Case 1 • May 19, 2010 at 10:42 UTC • Comparison with “Casper Live Aircraft tracking” at http://casper.frontier.nl • Reflection pattern corresponds exactly with flight path of SOX028 to Amsterdam • Nearest distance (zero doppler shift) at 10:42:44 • Aircraft: Cessna C650 • Speed: 223 knots (413 km/h) • Altitude: 17073 ft (5204 m)

  6. PE1NWL DL1DBC 10:42:00 UTC pos. doppler shift

  7. PE1NWL DL1DBC no shift 10:42:44 UTC

  8. PE1NWL DL1DBC neg. doppler shift 10:43:32 UTC

  9. Case 2 • May 19, 2010 at 10:54 UTC • Comparison with “Casper Live Aircraft tracking” at http://casper.frontier.nl • Reflection pattern corresponds exactly with flight path of IBE3245 to Madrid • Nearest distance (zero doppler shift) at 10:54:45 • Aircraft: Airbus A320 • Speed: 364 knots (674 km/h) • Altitude: 12917 ft (3936 m)

  10. PE1NWL DL1DBC 10:54:00 UTC pos. doppler shift

  11. PE1NWL DL1DBC no shift 10:54:45 UTC

  12. PE1NWL DL1DBC neg. doppler shift 10:55:27 UTC

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