Method for processing signals, - wherein an input signal (f LO), which exists at a first component, is routed from this first component to a second component, which can be operated as a frequency multiplier and as a subharmonic mixer; - wherein the second component multiplies the frequency of the received signal (3f LO) by means of at least one component part with a non-linear characteristic curve; - wherein the first component is a transmission mixer which forwards the input signal to the second component and in the opposite direction, in which signals are provided by the second component, has a step-down mixing functionality, - wherein the frequency-multiplied signal (3f LO) provided by the second component is emitted via an antenna, - wherein a signal (3f LO+ f doppler) is received by means of the antenna, and the received signal is subharmonically mixed (f LO +f doppler) by the second component and forwarded to the first component, - wherein the signal forwarded from the second component to the first component is step-down mixed by the first component, - wherein after the step-down mixing, a signal with the frequency f 3 − f i is provided by the first component wherein f 1 designates the frequency (f LO) of the input signal or, respectively, the frequency (f LO) of the signal provided to the second component by the first component, and f 3 designates the frequency of the signal which was subharmonically mixed by the second component and forwarded to the first component. - wherein an input signal (f LO), which exists at a first component, is routed from this first component to a second component, which can be operated as a frequency multiplier and as a subharmonic mixer; - wherein the second component multiplies the frequency of the received signal (3f LO) by means of at least one component part with a non-linear characteristic curve; - wherein the first component is a transmission mixer which forwards the input signal to the second component and in the opposite direction, in which signals are provided by the second component, has a step-down mixing functionality, - wherein the frequency-multiplied signal (3f LO) provided by the second component is emitted via an antenna, - wherein a signal (3f LO+ f doppler) is received by means of the antenna, and the received signal is subharmonically mixed (f LO +f doppler) by the second component and forwarded to the first component, - wherein the signal forwarded from the second component to the first component is step-down mixed by the first component, - wherein after the step-down mixing, a signal with the frequency f 3 − f i is provided by the first component wherein f 1 designates the frequency (f LO) of the input signal or, respectively, the frequency (f LO) of the signal provided to the second component by the first component, and f 3 designates the frequency of the signal which was subharmonically mixed by the second component and forwarded to the first component. f 1 designates the frequency (f LO) of the input signal or, respectively, the frequency (f LO) of the signal provided to the second component by the first component, and f 3 designates the frequency of the signal which was subharmonically mixed by the second component and forwarded to the first component.