Specialised in FMCW radar level, tide and wave monitoring since 1996 Tom van der Vlugt www.Radac.nl info@radac.nl

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

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

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

Radac’s WaveGuide is globally used to

Forecast accuracy improved by incorporating real time data

2 Out looking radar

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 768 m Bloks of 1024 chirps –→ sample rate sea 4.77 Hz 209.4 ms blocks –→ velocity resolution 7.16 cm/s 1024 chirps per block –→ velocity range -36.6...36.6 m/s

first experiments at Pier of Scheveningen 2010

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

Animations

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

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

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

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)

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…..

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