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North Hoyle Windfarm Report

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List of figures

1-1The wind farm at North Hoyle
2-1The position of the antenna for the Garmin GPS152 unit
2-2Locked satellites on the two control runs
2-3The display from the Garmin GPSIII unit during a control run
2-4The display from the Garmin GPS152 unit during a control run
2-5The recorded GPS track data for the three routes used in the trial
2-6The number of satellites locked onto by the GPS units along course 1
2-7The number of satellites locked onto by the GPS units along course 2
2-8The number of satellites locked onto by the GPS units along course 3
3-1The VHF antenna and receiver set up at Prestatyn
3-2Position of VHF signal loss relative to turbine positions with a 2dB and 3dB link margin
3-3Position of VHF signal loss relative to turbine positions with a 4dB and 5dB link margin
4-1MCA VHF communications evaluation schematic
5-1Position 1, the wind farm centre, with gain settings of 60% (left) and 20% (right)
5-2Position 2, 1000m from wind farm centre, close up (left) and the whole wind farm (right) with an automatic gain setting
5-3Position 3, 3000m from wind farm centre, 74% gain (left) 44% gain setting (right)
5-4On route to the wind farm with 64%(left) and 54%(right) gain settings
5-5On route to the wind farm with 44%(left) and 34% gain settings
5-6On route to the wind farm with 24% gain setting
6-1North Hoyle Vestas wind turbines
6-2Typical radar scanner horizontal and vertical beamwidths
6-3MCA small vessel radar detection capabilities schematic
6-4The Hoylake RNLI lifeboat "Lady of Hilbre" (top) and the Rhyl RNLI lifeboat "Lill Cunningham" (bottom)
6-5The Rhyl RNLI inshore lifeboat
6-6Shadow and blind arcs with side lobe echoes
6-7Range and bearing discrimination
6-8MCA range discrimination test 1 schematic
6-9"Lady of Hilbre" in turbine shadow on 6 nm range
6-10Still in shadow on 3nm range
6-11MCA range discrimination test 2 schematic
6-12Observed range discrimination
6-13MCA bearing discrimination test schematic
6-14Bearing discrimination trials results
6-15MCA Schematic for assessing side lobe, multiple and reflected echo effects
6-16Radar on 0.75 nm range and short pulse
6-17Further side lobes schematic
6-18Adjusting gain levels
6-19Precipitation effects
6-20North Hoyle wind farm with radar positions (Not to scale)
6-21Radar is on medium pulse
6-22Radar set to long pulse length
6-23Detection of the "Lady of Hilbre"
6-24Mobile radar at Gwaenysgor
6-25Relative Position of BHP Billiton Raytheon radar head at Gwaenysgor
6-26Raw radar with high persistence level
6-27Filtered display - high persistence
6-28Target lifeboats clear of the wind farm
6-29Larger vessel trials schematic
6-30MV "Norbay"
6-31"Fast Cat" and its "Blipper" radar reflector
6-32Raw radar data as the "Norbay" passes turbine 30 at a range of 800 metres
6-33Filtered radar data as the "Norbay" passes turbine 30 at a range of 800 metres
6-34Filtered radar data as the "Norbay" passes turbine 29
6-35Raw radar data as the "Norbay" passes turbine 28
6-36Raw radar data as the "Norbay" rounds NW corner of the wind farm
6-37Filtered radar data as the "Norbay" leaves the wind farm
7-1Furuno LC- 90 Loran C receiver
7-2Schematic of helicopter radar trial
       

List of tables

2-1Summary of visible satellites when adjacent to a turbine
       
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