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{{r|Direction finding}}

===High Frequency Direction Finding=== A RIVET JOINT ITU frequency bands|High Frequency (HF) direction finding|Direction Finding (DF) System adds a ten element HF array antenna on RIVET JOINT to provide H

{{r|Direction finding}}

*[[direction finding|radio frequency direction finder]]

'''Time difference of arrival (TDOA)''' is an electronic technique used in direction finding and navigation, in which the time of arrival of a specific signal, at physi

...that exploited inadvertent radiation from a radio receiv radio receiver. Direction finding and other signals intelligence techniques classically exploit radio ''trans

{{r|Direction finding}}

...t early breakthroughs. GCCS also obtained valuable intelligence through [[direction finding]] and [[traffic analysis]] by a division called the "Y Service".

Standardized USN systems go beyond simple direction finding and into COMINT. The AN/SLR-25 is a passive cryptologic exploitation system | title = Transportable Radio Direction Finding (TRDF) System (AN/SSQ-120)

...Second World War]], a U.S. Navy [[SIGINT before the Second World War#Naval direction finding and message interception|intercept station]] for [[communications intellige

...its tactical communications). If [[signals intelligence#direction finding|direction finding]] can localize the transmitter to the known position of an artillery site,

...hearing the signal until it determines the new frequency. In like manner, direction finding systems may not be able to follow the changing frequency long enough to get

...estine human-source intelligence (HUMINT) they sent might seem reasonable, direction finding, a discipline of signals intelligence (SIGINT) might have shown they were t

...tially, the policy was that the South Vietnamese would be trained in basic direction finding using "known or derived" technical information, but, for security reasons,

...If the EPIRB does not transmit the GPS coordinates, it may take several [[direction finding]] passes of the satellites to localize the beacon. Still, unless GPS is in

...sed on a now-outmoded VHF communications ssytem called NDRS. This has no [[direction finding]] capabilities, gaps in geographic coverage, and was based on single channe

...EAGLE and the JU-21 LEFT JAB, the latter being the first with computerized direction finding and data storage. Even more advanced ASA equipment was on P-2V aircraft bo ...elicopter, which has interception capabilities in the 1.5-150 MHz and direction finding between 20-76 MHz. The EH-60L has better communications and ungradabi