1. Specialised in FMCW radar level, tide and wave monitoring
since 1996
Tom van der Vlugt

2. Accurate over time and temperature
FMCW radar
no moving parts
No (re)calibration
Accurate over time and temperature

3. scatter strength and velocity of reflector
FMCW radar
scatter strength and velocity of reflector
Down looking

4. Sea level rise and fall
Tides
Storm surge
Tsunamis
Infra-gravity waves
Seiches/ harbour oscillations
Swell
Wind waves

5. Radac’s WaveGuide is globally used to

6. Forecast accuracy improved by incorporating real time data

7. 2
Out looking radar

8. SAR company MetaSensing
Out Looking Radar
SAR company MetaSensing
Sample rate 6MHz
Freq Sweep per chirp 200 Mhz –-> range resolution 75 cm
1024 samples per chirp –→ range m
Bloks of 1024 chirps –→ sample rate sea Hz
209.4 ms blocks –→ velocity resolution 7.16 cm/s
1024 chirps per block –→ velocity range m/s

9. first experiments at Pier of Scheveningen
2010

10. Information of the fixed FMCW radar
Per 200ms
In 1024 range cells
– reflection strength
– velocity distribution
1024x
velocity
distribution
Per range cell
Estimate of the
Orbital velocity
Per range cell
time series of
Orbital velocity

11. Animations

12. Sea trial Karel Doorman 15-18 dec 2015
1 radar MetaSensing
7 WaveGuides
1 stereo video
1 buoy

13. Results of comparison with buoy
Energy density spectra Of
Directional Waverider
And
Out Looking Radar
Wave height
as function of
distance
ca 1m20
speed
as function of
distance
0, 5 ,10 knots →
en 5 knots ←
Energy density spectra Of
Directional Waverider
And
Foreward Looking Radar

14. Secondary objective
Verify stereo imaging waves
Provides good “near range” wave info
Usable for “ride control” ?

15. Development first product Marin – NextOcean – Damen shipyards-
2017 – 2018
Development first product
Marin – NextOcean – Damen shipyards-
TNO – Radac
20 seconds forecast of ship motion to
Faster and more comfortable transport to wind park
(25% faster at same comfort level)
Safer transfer between boat and pole
(Hs from 1.5 to 2m –→ 120-→156 working days)

17. Assume a homoganeous area
estimate the statistical wave characteristics
Then
Fit a number (depending on statistics) of waves (ca 20-50) to
the observations
And let them propagate
Animation…..

18. Transformer platform windpark PrinsesAmalia Ships from Damen Shipyards
Facilities available
Pier of Scheveningen
Transformer platform windpark PrinsesAmalia
Ships from Damen Shipyards
Ships from KNRM (rescue services)
Stereo cameras Marin
Hfradar Wera Rotterdam harbour