[Milsurplus] more on DIFAR ASW system on P3

[Mike Feher]

Convergence zones were thermal layers in the ocean where sound carried much
further than through normal ocean ambient temperatures. Speed could be
determined by operators as well, since the display did indicate frequency
hence doppler shift could be seen and CPA (Closest point of approach could
be calculated from that. 73 - Mike 

 

Mike B. Feher, N4FS

89 Arnold Blvd.

Howell NJ 07731

848-245-9115

 

-----Original Message-----
From: milsurplus-bounces at mailman.qth.net
<milsurplus-bounces at mailman.qth.net> On Behalf Of Brian Harrison
Sent: Tuesday, July 7, 2020 4:14 PM
To: milsurplus listserv <milsurplus at mailman.qth.net>
Subject: [Milsurplus] more on DIFAR ASW system on P3

 

Guys,

 

Comments from my brother who spent ~ 10 years active as P3 Navigator

 

best,

brian

kn4r

 

> I concur with what Bill said for the most part. The AQA-7 operators, SS1
and SS2, didn't provide circles. They would provide frequency of the signal,
its signal strength, time of detection and loss of signal. Based on the
signal strengths, the TACCO could draw circles around the buoys on his
display to help localize the target. The greater the signal strength, the
smaller the circle. Where the circles intersected, if they did, could
provide possible target locations. That was only useful if the signal was
direct path (nearby the buoy), but not if the signal was actually from a
convergence Zone (CZ) (much farther away). The TACCO would use tactics to
determine between the two. The tactics would include more Lofar buoys and/or
some Difar buoys.

> 

> Interesting discussion. Brings back memories.

 

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