Why might secondary radar be preferred in air traffic control over primary radar?

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The preference for secondary radar in air traffic control primarily stems from its ability to provide more detailed and specific information about aircraft. Secondary radar operates by receiving signals from an aircraft's transponder, which actively replies to incoming radar signals. This leads to several advantages, including the ability to transmit data such as the aircraft's identification, altitude, and other detailed telemetry.

While detection range is an important factor, secondary radar typically does not inherently have a longer detection range than primary radar; however, the nature of the information it provides is far superior due to the interactive nature of transponders. This allows controllers to have a clearer picture of air traffic, enhancing situational awareness and safety. The advanced capabilities of secondary radar contribute significantly to effective air traffic management, making it the preferred choice over primary radar, which simply reflects the signals back from the aircraft without any identification or altitude data.

Specialized secondary radar technologies, such as Mode S and ADS-B, further enhance operational capabilities, allowing air traffic control systems to integrate more sophisticated data than what primary radar offers.