Logarithmic Arithmetic for Low-Power Adaptive Control Systems

To reduce the power dissipation in adaptive control systems, we propose replacing the exact arithmetic hardware units with approximate ones. As a case study, an adaptive control system for object tracking based on the Kalman filter is implemented in FPGA. A thorough analysis of the Kalman filter’s c...

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Bibliographic Details
Published in:Circuits, systems, and signal processing systems, and signal processing, 2017-09, Vol.36 (9), p.3564-3584
Main Authors: Lotric, Uros, Bulic, Patricio
Format: Article
Language:English
Subjects:
Adaptive control
Adaptive filters
Aeronautics
Arithmetic
Arithmetic and logic units
Aviation
Circuits
Circuits and Systems
Control systems
Electrical Engineering
Electronics and Microelectronics
Engineering
Instrumentation
Numerical controls
Product design
Signal,Image and Speech Processing
Surface hardness
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Summary:To reduce the power dissipation in adaptive control systems, we propose replacing the exact arithmetic hardware units with approximate ones. As a case study, an adaptive control system for object tracking based on the Kalman filter is implemented in FPGA. A thorough analysis of the Kalman filter’s circuitry for real-world object tracks acquired by an aviation radar system proved that adaptive control systems can successfully compensate for the calculation errors introduced by the approximate arithmetic units. The main contributions of this paper are that the introduction of the approximate arithmetic circuits to the adaptive control system (1) preserves the required accuracy and (2) significantly reduces the power dissipation and the size of the adaptive system’s circuitry.
ISSN:0278-081X
1531-5878
DOI:10.1007/s00034-016-0486-1