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UT EE 381K - Ultrawideband Radar Processing using Channel Information

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Ultrawideband Radar Processing Using Channel information from communication HardwareIntroductionPropagationMethod 1: Multiple UsersMethod 1 PerformanceMethod 2: Single AntennaBasic CalculationsOther Methods and Future WorkUltrawideband Radar Processing Using Channel information from communication Hardware Bryan WestcottUltrawideband Radar Processing using Channel Information from Communication HardwareIntroductionMapping the physical environment with channel information, sometimes called echolocationReuse hardware and network activityApplications include: location-based services, indoor GPS, location-based security, augmented realityTwo novel methods presentedPropagationWideband signals produce clearly resolvable multipath [Hovinen, 2002]Reflection, diffraction, corner reflectionsSonar methods use directional arrays- No angle-of-arrival ambiguity- But can’t use information from multiple reflectionsMethod 1: Multiple UsersDistributed set of users Calculate all possible tangents to pairs of reflections- One self reflection, one distributedSolutions- Collinear lines are surfaces- Intersecting lines are edges- Don’t calculate for bad solutionsRefinements possible after main surfaces are found- Find corners- Find hidden surfacesNo classification of multipath requiredMethod 1 PerformanceMeasure performance, users vs. channel tapsQuality combines correct hits, false hits and complexityRepeated measurement practical for SIC [Andrews, 2004]Method 2: Single AntennaMap a room with a single antennaWith two single reflections and one double reflection, we can measure the angle between all walls and classify reflectionsCombine all angles to solve for environment- 90/180 degree walls simplify equations, allow for refinements- Otherwise more calculations, but less commonComplications include: hidden surfaces, hidden corners and diffracting edgesCan extend the solution for these situations once initial solution is foundBasic CalculationsExtension of [McKerrow, 1993]Check for bad solutionsFirst method assumes user triangulation [IEEE 802.15 TG4a]More complicated for refinements, and multiple antennas222212142222141222212422212142242222422222214224222242222424624624242412222212212212190180limits and tionssimplifica2222tan2method241688244168824288316316421methodtdd:tdd:)-ddd+-ddt+dt+(- t)+d-t^(d-aπangles)r-sr+-srt+st+(-tys)r+-s(-tx)r-sr+-srt+st+)(-tr+- ss(t)rt-rs++tts-ssr-st-tr(y)rss(t)str(tx///Other Methods and Future WorkMethod 3: single user with multiple antennas- Use channel information between all antenna- Similar to array processingFuture Work- Kalman filter to track changes without requiring complete recalculation-Analyze effect of timing


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UT EE 381K - Ultrawideband Radar Processing using Channel Information

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