What is the primary difference between primary radar and secondary radar?

What is the primary difference between primary radar and secondary radar?

• A. Primary radar requires an electric signal; secondary radar does not
• B. Primary radar does not rely on a transponder; secondary radar does
• C. Primary radar has a longer range than secondary radar
• D. Primary radar is used for air traffic control; secondary radar is not

Answer: (B)

The primary difference between primary radar and secondary radar lies in their operational principles. Primary radar systems operate by transmitting a pulse of electromagnetic signals, which then bounce off objects—such as aircraft—and return to the radar site. This method does not depend on any onboard equipment of the aircraft, which means it can detect any object that reflects radar signals in its path, including weather phenomena. In contrast, secondary radar operates with the assistance of transponders onboard the aircraft. When a secondary radar system sends out a signal, the aircraft receives this signal and responds back with its own information, such as identification and altitude. This reliance on transponders not only enhances the functionality of secondary radar but also allows for more accurate data provision, making it crucial for tasks like air traffic control and collision avoidance. Therefore, the distinction that secondary radar relies on a transponder while primary radar does not encapsulates their fundamental difference in operation. This understanding is essential for comprehending how air traffic is monitored and managed in controlled airspace.

The primary difference between primary radar and secondary radar lies in their operational principles. Primary radar systems operate by transmitting a pulse of electromagnetic signals, which then bounce off objects—such as aircraft—and return to the radar site. This method does not depend on any onboard equipment of the aircraft, which means it can detect any object that reflects radar signals in its path, including weather phenomena.

In contrast, secondary radar operates with the assistance of transponders onboard the aircraft. When a secondary radar system sends out a signal, the aircraft receives this signal and responds back with its own information, such as identification and altitude. This reliance on transponders not only enhances the functionality of secondary radar but also allows for more accurate data provision, making it crucial for tasks like air traffic control and collision avoidance.

Therefore, the distinction that secondary radar relies on a transponder while primary radar does not encapsulates their fundamental difference in operation. This understanding is essential for comprehending how air traffic is monitored and managed in controlled airspace.