A radar system includes a measurement policy control unit that determines a measurement policy relating to how a signal is to be measured, a transmitting antenna that irradiates electromagnetic waves according to the measurement policy, a receiving antenna that receives reflected waves of the irradiated electromagnetic waves and generates a measurement signal, a storage unit that stores the measurement signals, a window control unit that determines a window for selecting the measurement signals, a signal selection unit that selects measurement signals from the storage unit based on the window, and an image generating unit that generates a radar image from the selected measurement signals.