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FMCW Radar Overview. Review of FMCW technology CRREL FMCW Radar Applications FMCW Radar Plans for CLPX?. FMCW Radar Source Signal. Snow Surface. Frequency varies linearly with time. FMCW Radar Parameters. Transit time (2R/c). Beat Frequency. Reference. Target. FMCW Radar Output. - PowerPoint PPT Presentation
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US Army Corpsof Engineers Engineer Research & Development Center
FMCW Radar Overview
Review of FMCW technologyReview of FMCW technology
CRREL FMCW Radar ApplicationsCRREL FMCW Radar Applications
FMCW Radar Plans for CLPX?FMCW Radar Plans for CLPX?
US Army Corpsof Engineers Engineer Research & Development Center
FMCW Radar Source Signal
Frequency varies linearly with time
Snow Surface
US Army Corpsof Engineers Engineer Research & Development Center
Transit time (2R/c)Beat Frequency
ReferenceTarget
FMCW Radar Parameters
US Army Corpsof Engineers Engineer Research & Development Center
Time (ms)0 16 32 48 64
Am
plit
ud
e
-2
-1
0
1
2
Frequency (kHz)200 400 600 800 1000
Mag
nit
ud
e
0.0
0.2
0.4
0.6
0.8
1.0
FMCW Radar Output
Mixer Output FFT of Mixer Output
US Army Corpsof Engineers Engineer Research & Development Center
Why FMCW Radar?
Inexpensive and easy to operateInexpensive and easy to operate
Field portable and robustField portable and robust
Wide bandwidth capabilityWide bandwidth capability
US Army Corpsof Engineers Engineer Research & Development Center
CRREL FMCW Radar
Ku-Band FMCW Radar
25 dB horn25 dB hornHP microwave sourceHP microwave source
LabVIEW data acquisitionLabVIEW data acquisition
US Army Corpsof Engineers Engineer Research & Development Center
Range (m)
2.50 2.75 3.00 3.25 3.50 3.75
Mag
nit
ud
e (
arb
un
its
)
0
25
50
75
100
125
150
8.0 - 12.0 GHz 9.5 - 10.5 GHz
FMCW Radar Bandwidth Diversity
Resolution ~ 1/Bandwidth
US Army Corpsof Engineers Engineer Research & Development Center
Snow Depth Measurements
Ka- and X-band FMCW Radar Experimental Results
Distance (m)
0 20 40 60 80 100
Sn
ow
De
pth
(c
m)
0.0
0.2
0.4
0.6
0.8
Manual Probe X-Band FMCW Radar
US Army Corpsof Engineers Engineer Research & Development Center
Polar Firn Stratigraphy
FMCW Radar in Greenland
Summer 1998
Summer 1997
Summer 1996
Summer 1995
Summer 1994
Summer 1993
0 20 40 60 80 100Distance (m)
0.0
0.5
1.0
1.5
2.0
2.5D
ep
th (
m)
Snow Pit Data(Hoar Location)
Hoar Stratigraphy
US Army Corpsof Engineers Engineer Research & Development Center
Ice Channel Detection with Microwave FMCW Radar
ExcavatedIce Channel
Ice Channels
Experiment Setup and Results
Corner Reflectors
Snow Surface
2- 6 GHz FMCW Radar
US Army Corpsof Engineers Engineer Research & Development Center
Radar Detection of Landmines
Snow Covered Test Site Anti-tank Mines in Frozen Ground
US Army Corpsof Engineers Engineer Research & Development Center
Radar Backscatter Measurements
US Army Corpsof Engineers Engineer Research & Development Center
Electromagnetic Signature of Snow, Ice and Frozen Ground
CRREL Test FacilityOptical and MMW Radar Data
US Army Corpsof Engineers Engineer Research & Development Center
FMCW Radar for CLPX?
Polarimetric backscatter (L,C,X,Ku)Polarimetric backscatter (L,C,X,Ku)
Multiband radar properties of snow Multiband radar properties of snow (C,X,Ku,Ka,V,W) (C,X,Ku,Ka,V,W)
Subsurface melt detectionSubsurface melt detection
US Army Corpsof Engineers Engineer Research & Development Center
Mobile Backscatter Measurements
B
CAA
B
C
US Army Corpsof Engineers Engineer Research & Development Center
Multiband Radar Properties of Snow Cover
X-band (8-12 GHz)
Ka-band (26.5-40 GHz)
C-band (3.9-5.9 GHz)
US Army Corpsof Engineers Engineer Research & Development Center
Subsurface Melt in Snow
Time series measurements.Time series measurements.