Aerospace and Electronic Systems Magazine September 2017 - 46

Expert System CFAR

Figure 7.

Expert System CFAR led to knowledge-based STAP [20].

Force Scientific Advisory Board). Subsequent embracing and maturation by DARPA resulted in transition of Expert System CFAR
to JSTARS in the Block 40 tracker upgrade.

FUTURE RESEARCH DIRECTIONS
The research and development of Expert System CFAR began
over 30 years ago and built from a solid foundation across many
disciplines and into many research domains. This can be appreciated in Figure 6. It has shaped a way of thinking about signal and
data processing that has changed the nature of US Department of
Defense (DOD) radar technology for adaptive filtering, detection
processing, as well as track formation, target identification, and
engagement [18].
As the Air Force pursues a vision for layered sensing, Expert
System CFAR and subsequent developments in knowledge-based
STAP and KA processing provided a compelling motivation to
extend the paradigm further into waveform agile, multiplatform,
multisensor, and multidomain instantiations of layered sensing in
order to meet future warfighting needs in complex environments.
Analysis of multichannel airborne radar data demonstrates the impact of Expert Systems and knowledge-based processing on lay46

ered sensing. In the upper and lower right of Figure 7, the impact
of heuristic processing on STAP is demonstrated via "Before" and
"After" results. In this graphic, knowledge-based STAP includes
nonhomogeneity detection [19] (analogous to excising outliers in
TM-CFAR), the application of corrected (measured) steering vectors, the exploitation of prior knowledge sources and data from
previous flights in heuristic and algorithmic radar signal and data
processing for target detection, and interference rejection in airborne radar.

ACKNOWLEDGMENT
The authors wish to acknowledge the management and leadership
of the US Air Force and DARPA for making this research, development, and technology transition possible, especially Dr. Schneible
and Dr. Guerci.

REFERENCES
[1]

IEEE A&E SYSTEMS MAGAZINE

Smith, J., and Byrd, D. Forty years of research and development at
Griffiss Air Force Base. Rome Laboratory, Griffiss AFB, NY, Tech.
Rep. RL-TR-92-25, AD-A250 435, July 1992.

SEPTEMBER 2017



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