EASA NAV(A)intermediate
Match each aviation navigation or surveillance system to its primary operating principle: Systems: 1. Primary Surveillance Radar (PSR) 2. Secondary Surveillance Radar (SSR) 3. Distance Measuring Equipment (DME) 4. VHF Omnidirectional Range (VOR) Principles: - Detects passive radio pulse reflections from an aircraft's surface - Interrogates airborne transponders and decodes active replies - Measures round-trip pulse travel time to calculate slant range - Compares the phase difference between two radiated signals to determine bearing
Answer
Primary Surveillance Radar (PSR) - Detects passive radio pulse reflections from an aircraft's surface; Secondary Surveillance Radar (SSR) - Interrogates airborne transponders and decodes active replies; Distance Measuring Equipment (DME) - Measures round-trip pulse travel time to calculate slant range; VHF Omnidirectional Range (VOR) - Compares the phase difference between two radiated signals to determine bearing
Explanation
Each system uses a different measurement or response principle: reflection, transponder reply, timing, or phase comparison. **Key takeaway:** Distinguish cooperative surveillance from reflected-signal radar. **Glossary:** Cooperative surveillance: surveillance using an aircraft transponder response.
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