In the automotive industry, radar systems are used to increase vehicle safety. Long-range radar (LRR) is a radar system that extends up to 200 m and covers speeds from 30 km/h to 250 km/h. It works according to the ToF method or DToF method.
Long-range radar operates according to the ToF method or the DToF method and, like short-range radar, is one of the Advanced Driver Assistance Systems( ADAS). With long-range radar, the radar beam is emitted in several narrow lobes to monitor the space in front of and to the side of the car. They detect stationary and moving objects and obstacles and provide information about the distance and relative speed of moving objects. The beam patterns have azimuth of between +/-10° and +/-20°, and vertical of +/-5° to cover the horizontal angle of view.
Long-range radars transmit in the M-band at frequencies between 76 GHz and 77 GHz and use Frequency Modulated Continuous Wave( FMCW) as their radar method. This type of modulation involves frequency modulation of a continuous carrier frequency. The reflected radar signals, which are linear in the frequency deviation, are evaluated by an algorithm and provide information on the speed and distance of other vehicles or of objects and persons.
Long-range radars are extremely accurate, both in distance and speed, because of the 77 GHz microwaves; they have high resolution and accurate angular reproduction. In contrast to long-range radar, short-range radar( SRR) operates at 24 GHz up to a distance of about 50 m.