二次监视雷达解释正确的是
A: second surveillance radar
B: secondary surveillance radar
C: primary surveillance radar
D: precision approach radar
A: second surveillance radar
B: secondary surveillance radar
C: primary surveillance radar
D: precision approach radar
举一反三
- For the surveillance(警戒) radar, the target receives energy from only a portion of the beam(波束), thus the R–4 relation(关系) between transmitted and received power levels(功率电平).
- 7. Precision Approach Radar (PAR) is used by air traffic controllers to keep track of airplanes far away from the airport.
- “Radar” is an example of acronym.
- Radar is better than GPS.
- Radar is an example of acronym. A: True B: False