NEW YORK—The Defense Advanced Research Projects Agency is exploring unconventional processing methods to analyze mission-critical intelligence, surveillance and reconnaissance (ISR) data in the analog realm.
The agency has launched a program called UPSIDE, which stands for the Unconventional Processing of Signals for Intelligent Data Exploitation. Darpa’s motivation is to find processing techniques that do not have the same power and speed limitations associated with digital processors used in today’s ISR platforms.
The program employs probabilistic inference as its fundamental computational model to drive down power consumption. Inference can be implemented directly in approximate precision by traditional semiconductors as well as by new kinds of emerging devices. This approach aims to compute inference directly and more naturally through a number of interconnected analog nodes.
“A single inference operation performed in digital CMOS could involve hundreds of operations. However, the inference operation can be more naturally performed directly by a group of coupled analog devices, reducing both power and the number of discrete operations,” said Darpa program manager Dan Hammerstrom. “Utilizing coupled analog devices to represent data in a non-Boolean form for high-order computation is expected to provide orders of magnitude improvements in the power efficiency of data processing.”
According to an agency announcement, the definition of emerging devices is broad to allow developers to propose a wide range of parts. But they cannot be CMOS-based, at least not without additional specialized processing steps, and cannot be on the mainstream ITRS http://www.itrs.net/about.html roadmap. Analog-based devices such as memristors and spin torque oscillators could possibly be used to replace CMOS-based digital processors to accelerate video and imagery analysis in ISR systems, according to Hammerstrom.
The level of noise produced by the aliasing effect during the sampling process can be reduced in two steps of the signal chain. The inclusion of the anti-aliasing filter, combined with over-sampling and decimation, are effective mitigation techniques.
Over the years, the introduction of more complex tools has enabled much more capability in the circuit simulation arena. These new tools enable exploring circuit interaction to arrive at solutions to complex issues.