Friday, December 8, 2017

TDoA measurements using GPS time-stamped IQ samples from KiwiSDRs (5)

VOLMET on 5450 kHz 20171208T1734Z

Below are time-differences for a VOLMET signal using USB modulation. The cross-correlation peaks are not very sharp due to the limited bandwidth. For the cross-correlations, intervals of 1 seconds have been used.
time-differences for 5450 kHz 20171208T1734Z (VOLMET)

The resulting TDoA maps look like this:
TDoA for 5450 kHz 20171208T1734Z (VOLMET)

Note that all these results are biased by ionospheric propagation delays and many other sources of systematic errors.

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