Keysight FieldFox B Series User Manual page 521

Direction Finding (Option 390 Time Difference of Arrival (TDoA)) – Requires Spectrum
Analyzer Mode (Option 233), and GPS Receiver (Option 307)
Time Difference of Arrival (TDOA) – (Requires Option 390)
Time Difference of Arrival (TDOA) – (Requires Option 390)
The Time Difference of Arrival (TDOA) measurements are generally used for
geo-locating RF sources. It requires three or more remote FieldFox units set up
as receivers (sensors) capable of detecting the signal-of-interest. All FieldFox
units are synchronized using a GPS signal.
The Spectrum measured by all FieldFox units selected is measured and used to
identify the signal of interest which is then geo-located using TDoA.
IMPORTANT! It is not sufficient to be locked to the GNSS satellite, the
frequency reference must be locked to GPS.
Learn more about time difference of arrival (TDoA) Option 390, by referring to
S9910A Keysight Signal Measurement Software (KSMS) web help
https://www.keysight.com/us/en/products/software/pathwave-test-softwar
e/pathwave-measurements.html.
Keysight N9938-90006 User's Guide 521