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| 318 kHz DGPS |
Showing posts with label LF. Show all posts
Showing posts with label LF. Show all posts
Sunday, October 27, 2019
DGPS TDoA
Recently, some people have observed a DPGS signal on 318 kHz. Existing software displays its location as Shepelevskiy (Leningrad Oblast) ; however KiwiSDR TDoA shows a different likely location.
Thursday, July 4, 2019
Talk on KiwiSDR TDoA is available on YouTube
This is just a short note that my recent talk on KiwiSDR TDoA at the Software Defined Radio Academy 2019, which took place during the German Ham Convention in Friedrichshafen, Germany, is now available on YouTube.
For other talks from this meeting see http://youtube.sdra.io/.
For other talks from this meeting see http://youtube.sdra.io/.
Thursday, November 30, 2017
TDoA measurements using GPS time-stamped IQ samples from KiwiSDRs (1)
Some relevant links are:
- http://kiwisdr.com/
- https://github.com/jks-prv/Beagle_SDR_GPS/issues/130
- http://valentfx.com/vanilla/discussion/940/direction-finding-and-linking-existing-kiwisdrs
All plots below were generated by a combination of
- kiwirecorder.py (https://github.com/jks-prv/kiwiclient/tree/jks-v0.1) forked from Dmitry’s https://github.com/dev-zzo/kiwiclient
- http://octave.org/ (+signal +mapping)
- http://www.gnuplot.info/
using the code here https://github.com/hcab14/TDoA which for now is the only documentation.
Note that this is preliminary work at a very early stage.
In particular many systematic errors are for now being neglected, such as
More information will be added later on.
In particular many systematic errors are for now being neglected, such as
- different delays (antenna + frond-end) per KiwiSDR
- delays due to propagation
- not using consistently WGS84 coordinates
- having only approximate locations for the KiwiSDRs
More information will be added later on.
77.5 kHz 20171127T104156Z DCF77
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| DCF77 TDoA |
225 kHz 20171128T104940Z Polskie Radio 1
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| TDoA 225 kHz PR2 |
10611 kHz 20171128T171256Z OTHR
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| TDoA 10611 kHz |
65.8 kHz 20171127T160437Z FUE
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| TDoA 68.5 kHz |
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