Vehicle-mounted radar device

The invention provides a vehicle-mounted radar device which comprises an oscillator, an amplifier, a distributor, a transmitting antenna, a plurality of receiving antennas, a receiving switch, a frequency mixer, a filter, an analog-digital converter and a signal processor. The vehicle-mounted radar device is used for transmitting radar waves in the advancing direction of a vehicle provided with the device. The vehicle is referred to as the vehicle provided with the radar in the following statement. The vehicle-mounted radar device is used for receiving the radar waves reflected from an object so as to obtain information of the object. The oscillator generates radio frequency (RF) signals in a millimetric wave band for conducting frequency modulation through modulation signals. Each cycle is provided with an ascending range with the frequency of the modulation signals being linearly increased along with time and a descending range with the frequency of the modulation signals being linearly decreased along with time.