A radar system, comprising: a window, a radar transmitter, a radar receiver, a processor, and a signal receiving circuit, wherein the radar transmitter is configured to: transmit a radar detection signal, and transmit the radar detection signal to a front obstacle through the window; the radar receiver is connected to the signal receiving circuit, and is configured to: receive a reflected signal generated when the radar detection signal encounters the obstacle, and transmit the reflected signal to the signal receiving circuit; the signal receiving circuit is connected to the processor, and is configured to: when the radar transmitter transmits the radar detection signal, receive, after preset duration, the reflected signal transmitted by the radar receiver, convert the reflected signal into an electrical signal, and output the electrical signal to the processor, wherein the preset duration is a sum of first duration required for the radar detection signal to arrive at the window and second duration required for the reflected signal to arrive at the radar receiver from the window; and the processor is configured to process the electrical signal to obtain information about the front obstacle; wherein the signal receiving circuit comprises: a control circuit and a converter; the control circuit is configured to: connect to a power supply, receive electric energy output by the power supply, and when the radar transmitter transmits the radar detection signal, supply electric energy to the converter after the preset duration; and the converter is separately connected to the control circuit, the radar receiver, and the processor, and is configured to: when the control circuit supplies the electric energy, receive the reflected signal transmitted by the radar receiver, convert the reflected signal into the electrical signal, and output the electrical signal to the processor; wherein the control circuit comprises: an inductor, a diode, a first switch, and a first capacitor; a first end of the inductor is configured to connect to a positive electrode of the power supply, and a second end of the inductor is connected to an anode of the diode (D 1); a cathode of the diode is separately connected to a first end of the first switch, a first end of the first capacitor, and the converter; and a second end of the first capacitor and a second end of the first switch are separately configured to connect to a negative electrode of the power supply. the radar transmitter is configured to: transmit a radar detection signal, and transmit the radar detection signal to a front obstacle through the window; the radar receiver is connected to the signal receiving circuit, and is configured to: receive a reflected signal generated when the radar detection signal encounters the obstacle, and transmit the reflected signal to the signal receiving circuit; the signal receiving circuit is connected to the processor, and is configured to: when the radar transmitter transmits the radar detection signal, receive, after preset duration, the reflected signal transmitted by the radar receiver, convert the reflected signal into an electrical signal, and output the electrical signal to the processor, wherein the preset duration is a sum of first duration required for the radar detection signal to arrive at the window and second duration required for the reflected signal to arrive at the radar receiver from the window; and the processor is configured to process the electrical signal to obtain information about the front obstacle; wherein the signal receiving circuit comprises: a control circuit and a converter; the control circuit is configured to: connect to a power supply, receive electric energy output by the power supply, and when the radar transmitter transmits the radar detection signal, supply electric energy to the converter after the preset duration; and the converter is separately connected to the control circuit, the radar receiver, and the processor, and is configured to: when the control circuit supplies the electric energy, receive the reflected signal transmitted by the radar receiver, convert the reflected signal into the electrical signal, and output the electrical signal to the processor; wherein the control circuit comprises: an inductor, a diode, a first switch, and a first capacitor; a first end of the inductor is configured to connect to a positive electrode of the power supply, and a second end of the inductor is connected to an anode of the diode (D 1); a cathode of the diode is separately connected to a first end of the first switch, a first end of the first capacitor, and the converter; and a second end of the first capacitor and a second end of the first switch are separately configured to connect to a negative electrode of the power supply.