In passive coherent radar, which transmitter type is NOT controlled by the air defense system?

In passive coherent radar, which transmitter type is NOT controlled by the air defense system?

• A. Non-cooperative
• B. Cooperative
• C. Dedicated
• D. Controlled

Answer: (A)

In passive coherent radar, the system relies on external transmitters for illumination, and some of these can be managed or commanded by the air defense system while others cannot. The type that is not controlled by the air defense system is the non-cooperative transmitter. Since it doesn’t cooperate or align with the defense network, its timing, frequency, and power aren’t adjustable by the system, making processing more challenging because the reference signal may be unknown or variable. The other transmitter types—cooperative, dedicated, and controlled—are those that the air defense system can manage or coordinate, providing known characteristics that simplify coherent processing.

In passive coherent radar, the system relies on external transmitters for illumination, and some of these can be managed or commanded by the air defense system while others cannot. The type that is not controlled by the air defense system is the non-cooperative transmitter. Since it doesn’t cooperate or align with the defense network, its timing, frequency, and power aren’t adjustable by the system, making processing more challenging because the reference signal may be unknown or variable. The other transmitter types—cooperative, dedicated, and controlled—are those that the air defense system can manage or coordinate, providing known characteristics that simplify coherent processing.