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Radar Impact

Radar Impact Assessments

Why assess Radar Impact?

Buildings, tall structures and wind turbines can interfere with radar systems resulting in many developments being delayed or blocked due to objections by radar operators. Interference typically occurs due to radar signals being blocked or reflected – which can cause a reduction in radar performance.

What are the benefits of a Pager Power Radar Impact Assessment?

A Radar Impact Assessment allows developers to understand whether their proposed development is likely to cause an unacceptable radar impact and can also help radar operators determine that a particular development will be acceptable.

Radar Impact Assessments help radar operators professionally safeguard their radar whilst allowing project developers to effectively manage the risk of planning refusal due to radar impact.

How does Pager Power Assess Radar Impact?

Radar can have ranges of more than 200 nautical miles. Radar Line of Sight Analysis (RLOS) is often undertaken in the first instance to determine whether a particular development is likely to affect a particular radar. RLOS takes terrain, Earth Curvature and refraction into account to determine whether the top of a development is likely to be visible to the radar antenna. The result of RLOS analysis is that a development is determined to be “visible” or “hidden”.

Further analysis can then be undertaken to determine what technical effects the development is likely to have on the radar and associated displays. This is typically followed by an operational assessment to establish the overall impact.

When are developments assessed?

Proposed developments are typically assessed at the design, planning and permitting stage so as to ensure that a proposed development will not cause an unacceptable radar impact when built.

When should an assessment be considered?

The maximum assessment distance varies considerably from country to country – and from operator to operator – so there are no hard and fast rules.

Developments are generally more likely to require assessment when one or more of the following apply:

  • Development is within 16km of a Secondary Surveillance Radar (SSR)
  • Development is within 30km of a meteorological radar
  • Development is a wind turbine
  • Development is within Radar Line of Sight
  • Assessment has been requested by a radar operator
  • Neighbouring developments have been subject to a radar objection

Where are radar typically located?

Radar are often located on airports or aerodromes – however many are located on hills or high ground away from airports.

Radar are typically operated by en-route air navigation service providers, meteorological agencies, airports or military authorities. The largest consultees in the UK are NATS, the Ministry of Defence and the Met Office.

What types of Radar can be assessed?

Typically impacts on the following can be considered:

  • Secondary Surveillance Radar (SSR)
  • Primary Surveillance Radar (PSR)
  • Air Traffic Control Radar
  • Air Defence Radar
  • Meteorological Radar
  • Marine Radar
  • Precision Approach Radar

What does an assessment typically include?

A typical assessment will include:

  • Development Details
  • Radar Details
  • Assessment Methodology
  • Line of Sight Assessment
  • Radar Detectability Assessment
  • Shielding Assessment
  • Technical Assessment
  • Operational Impact Assessment
  • Mitigation Overview
  • Conclusions and Recommendations

What countries require Radar Impact assessments?

Civil and Military requirements for radar impact assessments vary significantly from state to state. Pager Power has undertaken Radar Impact assessments in:


Next steps

If you are planning a development that may impact a radar system please get in touch – we can advise whether a Radar Impact assessment may be able to help your development progress.

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