Velocity-Range Gate Stealers are designed to defeat Doppler tracking radars by exploiting which parameter?

• A. Frequency shift used for detection
• B. Pulse duration
• C. Antenna gain
• D. Transmitter power

Answer: (A)

At the heart of this concept is how Doppler tracking radars identify and maintain targets: they rely on the Doppler frequency shift of the returned signal as the primary cue for detection and velocity measurement. The radar uses this frequency shift to place signals into velocity gates, and it also gates by range to lock onto a particular range. By introducing signals that mimic Doppler shifts within the tracker’s velocity gate, a spoofed target can be mistaken for a legitimate one. This causes the radar to shift its attention to the fake target, effectively stealing the gate and degrading tracking of the real target. Pulse duration, antenna gain, and transmitter power influence other aspects of radar performance like range resolution or signal strength, but they do not alter the fundamental Doppler-based tracking mechanism used to gate and track targets, which is why the Doppler shift parameter is the critical vulnerability here.