Accession Number:

ADA412597

Title:

A Digital Signal Processor for Doppler Radar Sensing of Vital Signs

Descriptive Note:

Corporate Author:

LUCENT TECHNOLOGIES INC MURRAY HILL NJ

Report Date:

2001-10-25

Pagination or Media Count:

5.0

Abstract:

A digital signal processor for Doppler radar sensing of vital signs is described. A voltage waveform signal containing respiration and heartbeat signatures is low-pass filtered 0.7 Hz for the respiration and band-pass filtered 1.0 - 3.0 Hz for the heart signal. The autocorrelation function is used to calculate the rate per minute for each of these signals. To make the processor more robust, several signal processing techniques are applied. One of these techniques, a method commonly used on audio signals for formant removal, is called center clipping. Another technique is the use of a Hanning window. To reverse the distinct shape left by the Hanning window an undo window is applied. The processor Is programmed in LabVIEW.

Subject Categories:

  • Active and Passive Radar Detection and Equipment

Distribution Statement:

APPROVED FOR PUBLIC RELEASE