Which of the following is a baseline metric to measure when evaluating a new SEW module?

• A. Beam squint
• B. Spectral leakage
• C. Jamming-to-signal ratio
• D. GNSS spoofing detection rate

Answer: (C)

Evaluating an SEW module centers on how well it preserves the desired signal when there’s deliberate interference. A baseline metric for this is the jamming-to-signal ratio, which compares the power of the jamming signal to the power of the legitimate signal at the receiver (often after processing). A lower jamming-to-signal ratio means the SEW module is doing a better job of suppressing the jammer and keeping the target signal strong. In practice, you measure the received signal and jammer powers with the SEW active and compare them to the case without jamming or with a known reference, expressing the result in dB. This provides a direct, comparable measure of resilience and performance across different setups or configurations.

Beam squint describes how the antenna beam direction shifts with frequency, which is a hardware/beamforming artifact and not a direct measure of anti-jamming performance. Spectral leakage concerns how signal energy bleeds into adjacent frequencies, a processing artifact that doesn’t quantify how well the system withstands interference. GNSS spoofing detection rate gauges how often spoofing is correctly identified, which is about detection capability rather than the SEW module’s actual ability to maintain the signal in the presence of interference. Thus the jamming-to-signal ratio best captures what you want as a baseline when evaluating an SEW module.