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Data Compression Algorithm Architecture for Large Depth-of-Field Particle Image VelocimetersA large depth-of-field particle image velocimeter (PIV) is designed to characterize dynamic dust environments on planetary surfaces. This instrument detects lofted dust particles, and senses the number of particles per unit volume, measuring their sizes, velocities (both speed and direction), and shape factors when the particles are large. To measure these particle characteristics in-flight, the instrument gathers two-dimensional image data at a high frame rate, typically >4,000 Hz, generating large amounts of data for every second of operation, approximately 6 GB/s. To characterize a planetary dust environment that is dynamic, the instrument would have to operate for at least several minutes during an observation period, easily producing more than a terabyte of data per observation. Given current technology, this amount of data would be very difficult to store onboard a spacecraft, and downlink to Earth. Since 2007, innovators have been developing an autonomous image analysis algorithm architecture for the PIV instrument to greatly reduce the amount of data that it has to store and downlink. The algorithm analyzes PIV images and automatically reduces the image information down to only the particle measurement data that is of interest, reducing the amount of data that is handled by more than 10(exp 3). The state of development for this innovation is now fairly mature, with a functional algorithm architecture, along with several key pieces of algorithm logic, that has been proven through field test data acquired with a proof-of-concept PIV instrument.
Document ID
20130011236
Acquisition Source
Goddard Space Flight Center
Document Type
Other - NASA Tech Brief
External Source(s)
http://www.techbriefs.com/component/content/article/15861
Authors
Bos, Brent (NASA Goddard Space Flight Center Greenbelt, MD, United States)
Memarsadeghi, Nargess (NASA Goddard Space Flight Center Greenbelt, MD, United States)
Kizhner, Semion (NASA Goddard Space Flight Center Greenbelt, MD, United States)
Antonille, Scott (NASA Goddard Space Flight Center Greenbelt, MD, United States)
Date Acquired
August 27, 2013
Publication Date
March 1, 2013
Publication Information
Publication: NASA Tech Briefs, March 2013
Subject Category
Man/System Technology And Life Support
Report/Patent Number
GSC-15960-1
Distribution Limits
Public
Copyright
Public Use Permitted.

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