the radar cross section of the human heartbeat...
TRANSCRIPT
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The Radar Cross Section of the human heartbeat and respiration
Øyvind Aardal,PhD Student10 May 2010
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Medical UWB radar at FFI overviewMedical UWB radar at FFI overview
Activities and laboratory
Calibration of UWB physiological recordings
Human heartbeat and respiration Radar Cross Section
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Radar laboratory for low-clutter ycalibrated measurements
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With focus on UWB, we research the use of radar for heartbeat and respiration monitoring
Ongoing research:
-Developing robust detection and processing algorithms.
-Determine the radar cross section (RCS) of heartbeats and respirationheartbeats and respiration.
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Calibrated radar recordings of gphysiological motion
H ?
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Frequency domain measurement modelFrequency domain measurement model
tV ( ) aH ( )
CH ( ) TH ( )
aH ( )V( ) +
2T t a C TV ( ) V ( )H ( )[H ( ) H ( )]
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Frequency domain calibration routineFrequency domain calibration routine
Step 1: Remove clutter from sphere and person measurements:p p p
2T T C t a TV ( ) V ( ) V ( ) V ( )H ( )H ( )
S S S2
C t aV ( ) V ( ) V ( ) V ( )H ( )H ( )
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Frequency domain calibration routineFrequency domain calibration routine
Step 2: Software gating in the fast time domain:p g g
Tv ( ) Tv̂ ( )T ( ) T ( )
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Frequency domain calibration routineFrequency domain calibration routine
Step 3: Calibration in frequency domain:p q y
Tl
V̂ ( )V ( ) cal
S
V ( ) 1V̂ ( )SNR( )
With sphere and person the same range from the radar:p p g
2 T ( )| V ( ) | T
calS (
| V ( ) |)
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Slow time variations at the range where gthe person is sitting
A sitting person holding his breath.
A sitting person breathing.g
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Processing to separate physiological g p p y gmovement from stationary targets
calv ( )Raw signal Linear trends removed
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Processing to separate physiological g p p y gmovement from stationary targets
calv̂ ( )
Further processed by bandpass filtering in slow time
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Radar Cross Section (RCS) of human ( )heartbeat and respiration
2ˆ| ( ) |cal S2| v ( ) |
Remember:
( )2 Tcal
S
((
)| V ( ) |)
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Radar Cross Section (RCS) of human ( )heartbeats, processed with various passbands
2ˆ| ( ) |cal S2| v ( ) |
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Radar Cross Section (RCS) of human ( )respiration, processed with various passbands
2ˆ| ( ) |cal S2| v ( ) |
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Radar heartbeat recordings agrees with g gECG recordings
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In conclusion: The human heartbeat and respiration RCS have been found for 2-3GHz
Questions?