Navigation PPLadvanced
Compare primary radar and SSR, and identify one kind of information each system can provide.
Answer
Primary radar transmits energy and detects reflections from the aircraft; antenna orientation and pulse travel time provide direction and range. SSR interrogates an aircraft transponder, whose coded reply can provide identification and, in Mode C, pressure altitude.
Explanation
Primary radar does not require onboard cooperative equipment; it detects reflected energy. SSR is cooperative because the aircraft transponder must reply to interrogation. The response can carry coded identity and pressure altitude in Mode C. **Key takeaway:** Primary radar detects reflection; SSR receives a transponder response. **Glossary:** **Interrogation**: ground radar transmission requesting a transponder reply.
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