The invention discloses a synthetic aperture radar system, comprising: a signal transmitting module which comprises a transmitting channel and a first phase locked loop, wherein the first phase-lockedloop is configured to transmit an excitation signal for the transmitting channel, and after the transmitting channel processes the excitation signal, a transmission signal is generated; a signal receiving module which includes a receiving channel and an analog-to-digital converter connected to an output end of the receiving channel, wherein the receiving channel is used for receiving an echo signal; and a clock module which is configured to provide a reference clock signal for the first phase-locked loop and the analog-to-digital converter. The synthetic aperture radar system provided by theinvention has a simple structure and low power consumption, and the signal transmitting module and the signal receiving module can be fabricated by using a silicon-based process, which is beneficial to realize integrated integration.