Which of the following is NOT one of the four radar methods?

• A. Pulse Modulation
• B. Frequency Modulation
• C. Side-lobe suppression
• D. Continuous Wave (CW)

Answer: (C)

The essential idea is distinguishing how radar signals are transmitted and interpreted versus how signals are cleaned up and shaped. The main radar methods describe how the radar emits energy and extracts range or velocity information: sending short pulses (pulse modulation) to measure echoes and determine distance; using a continuously transmitted carrier (continuous wave) often paired with Doppler techniques to detect motion; and sweeping or modulating the frequency (frequency modulation, such as FM-CW) to derive range from the beat frequency of the received signal. Side-lobe suppression is a technique applied to the antenna pattern or signal processing to reduce energy in the sidelobes, improving detection, but it isn’t a fundamental mode of radar operation. So it isn’t one of the primary radar methods.