November 19, 2006

1

Suppression of narrow-band interference in UWB impulse radar for human being detection

Problem statement and proposed solution

Imre Damen

IRCTR

November 19, 2006 2

Introduction

• Europcom• “Locating survivors of an emergency in smoke-

filled rooms or buried under rubble”• Motion of chest while breathing• Backscatter weak and orientation dependent• Noise, cutter and narrowband interferers

November 19, 2006 3

Problem statement

“Suppress the narrowband interferers without requiring to much computational power, while preserving the waveform and the signal energy”

• Computational power• Preserving waveform• Preserving signal energy

November 19, 2006 4

Internal / External interference

Internal interference• Originates from within equipment• Stationary, except for DC offset• Known frequencies

External interference• Originates from systems like GSM, WiFi,

C2000• Time variant• Frequencies unknown

November 19, 2006 5

Proposed solution internal interference

• Singular Value Decomposition

• Signal- and clutter-free range profiles

• Estimate and subtract

November 19, 2006 6

Proposed solution external interference “Estimate and Subtract”

November 19, 2006 7

Proposed solution external interference “Filter and Restore”

November 19, 2006

Questions