Abstract: A method for the detection of sensitivity losses of an FMCW radar locating device due to diffuse sources of loss, in which the radar locating device emits a transmit signal whose frequency is periodically modulated in successive modulation ramps, and at least one power characteristic of at least one frequency portion of a signal received by the radar locating device is evaluated, wherein the power of the transmit signal is varied cyclically, in each case after the completion of a modulation ramp, and the sensitivity losses are determined on the basis of differences in the power characteristics of signals received during successive modulation ramps having identical modulation.

Abstract: A method for detecting precipitation using a radar sensor system for motor vehicles designed for locating objects in the surroundings of the vehicle, in which method a locating signal that is a measure of the received power density as a function of the distance is integrated across a specific distance range lying below a limit distance for detecting precipitation. The locating signal is subjected to a filtering procedure before being integrated, the filtering procedure suppressing the peaks caused by located objects so that the filtered signal forms a measure of the noise level as a function of the distance.

Abstract: A method for detecting precipitation using a radar locating device for motor vehicles, that is designed to locate objects in the surroundings of the vehicle, in which method a locating signal (42), which is an index for the received power density as a function of the distance (R), is integrated over a first distance range (INT1), which is below a limit distance (Rlim) for the detection of precipitation, wherein the locating signal (42) is additionally integrated over a second distance range (INT2), which is above limit distance (Rlim), and for the detection of precipitation, the integrals over the first and second distance range are compared with each other.