Operating Interrogation Rates

0336-EX-CN-2018 Text Documents

Telephonics Corporation

2018-04-18ELS_208218

                                         Exhibit 2

Operating Interrogation Rates
The equipment for which this application is made utilizes a dynamic Pulse Repetition Frequency
(PRF) management scheme that adjusts the interrogation rate depending on interrogation modes,
interrogation interlace, and antenna speed.

The Telephonics PRF stagger algorithm uses a 256 step stagger table array configured as a
stagger matrix of 16 columns of 16 rows. When Column 16 is reached for a given row, the
pseudo random counter is activated again to select another row and the sequence continues.
The range of PRI offset values are from 0 to 255 decimal, which corresponds to a stagger range
from 0 us to 92.4375 us. The matrix values are software downloadable and are designed not
only to operate in the surveillance volume of other military and civil interrogator systems
without mutual interference but also to support multiple like systems (e.g. several
interrogators operating within the same surveillance volume) or other Military mobile or
shipboard systems operating in the same surveillance volume.


The combination of the Telephonics RPF stagger algorithm of a pseudorandom operation
coupled with a set stagger sequence mitigates the problems associated with pseudorandom
only stagger algorithms or with fixed set stagger algorithms. The Telephonics PRF stagger
algorithm has been rigorously tested through flight testing and by independent adjacent site
performance evaluations made by the FAA technical center and by Eurocontrol in live
demonstrations with our AWACS AN/UPX-40 interrogator system and others. The result of the
US and European testing was that no interference to ATC systems was detected. These results
were provided at the 2010 DoD AIMS Conference in Orlando, Florida.

The Telephonics Interrogation Management stagger algorithm is software controlled, provides
dynamic allocation of interrogation rates and staggers, and is table driven to be very flexible.
The Telephonics Interrogation Management stagger algorithm was specifically designed to
address FAA/DoD AIMS concerns and in conjunction, provides a robust stagger capability that
meets or exceeds all system requirements.



Document Created: 2011-08-29 16:19:54
Document Modified: 2011-08-29 16:19:54

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