Radar signals are designed to give unique advantages to the radar system's performance. STK/Radar's signal power spectral density (PSD) analysis capability, by showing power distribution over the frequency band, provides insight into the signal characteristics of a radar. Radar transmitter filter models enable signal spectrum engineering. The filters on the radar receiver's front end use the spectrum power distribution characteristics to reduce the impact of jamming. Radar phased-array antennas dynamically shape the gain pattern to provide additional target tracking capability. he adaptive nulling significantly adds to the jamming protection.