qcode
Although the clutter from the windfarm itself is problematic the radar return problem comes not from the permanent echoes that the turbines generate (there are filters that can minimise or their effect), but rather from the weakened returns in the "shadow" beyond these echoes. A farm of up to 20 turbines would, it is believed, absorb significant amount of radar energy, with the consequence that radar fidelity beyond the turbines out to the edge of cover would be compromised... In much the same way an aircraft passing between another aircraft and the radar aerial will stop the outgoing pulse from reaching the further aircraft, but the time when both aircraft and aerial are aligned is minimal. Not the case with a permanent echo... hence the concern?
The CAA and Flight Precision Ltd (the principle "Flight Checkers" in the UK) are conducting trials to see how much effect this actually has. It is a relatively newly recognised problem... hence the existing windfarm which may already have been in place.
All ATSUs are required by Law to have a Safety Management System that is to examine any such proposal or change, and act if there is a possibility of accident or incident. Agreeing to the positioning of further windfarms without question would probably, therefore, be neglectful?
Last edited by Pierre Argh; 30th September 2005 at 07:50.