Aerospace and Electronic Systems Magazine September 2017 - 44

Expert System CFAR

Figure 3.

Prototype Expert System CFAR detection processor.

ciated with significant increases in power-aperture product. It was
instead accomplished with advanced signal processing consisting
of characterization of the underlying interference, knowledge of
the conditions where each CFAR algorithm performs optimally,
and smart but simple rules to guide in their selection. This signal

Figure 4.

Expert System CFAR results using measured E-3 AWACS radar data.

44

processing technique, simple in nature, produced an average performance increase of approximately 7 dB!
By the mid-1990s, the Air Force had reorganized its four laboratories into a consolidated organization known as the Air Force
Research Laboratory (AFRL), which remains in existence today.
The research continued within the Sensors Directorate of AFRL into the early
2000s when Dr. Joseph Guerci, a respected colleague, initiated technology development at Defense Advanced
Research Projects Agency (DARPA)
under a program known as KASSPER
(Knowledge-Aided Sensor Signal Processing and Expert Reasoning). This
program sought to maximize the payoff
from heuristic signal and data processing, and especially to formalize the architectures needed to field this important technology widely and affordably.
Dr. Guerci, along with the authors and
their colleagues, integrated this technology with waveform diversity, track
processing, and parameter estimation.
The second author elected to manage the
KASSPER program and to focus on two
key areas of intended accomplishment.
First, he sought to develop a test bed in
order to integrate various knowledge-

IEEE A&E SYSTEMS MAGAZINE

SEPTEMBER 2017



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