Active radar is a technology used for detecting and tracking objects by transmitting electromagnetic signals and analyzing their reflection. However, there are various synonyms that can be used for the term active radar. These include pulse radar, continuous-wave radar, monopulse radar, phased array radar, and synthetic aperture radar. Pulse radar operates by transmitting short pulses of radio waves and analyzing the returning echoes, while continuous-wave radar emits a continuous wave of electromagnetic radiation. Phased array radar, on the other hand, uses an array of antennas to transmit and receive signals, while synthetic aperture radar generates high-resolution images by collecting data from multiple radar pulses. These synonyms provide a broad range of radar technologies used in different applications.