MillimeterWave Radar Technology for （MillimeterWave雷达技术）.pdfVIP

T ECHNICAL R EPORTS Millimeter-Wave Radar Technology for Automotive Application by Shinichi Honma and Naohisa Uehara* Mitsubishi Electric Corporation has developed struction of the RF circuit. Moreover, this sys- a millimeter-wave radar for automotive applica- tem has often been adopted for automotive mil- tion. Monolithic microwave integrated circuits limeter-wave radars because it can measure (MMICs), developed specifically for this appli- both the distance to a target and the target’s cation by Mitsubishi Electric, are used for the relative velocity simultaneously. The measure- radio-frequency (RF) module to obtain outstand- ment principle of the FM-CW radar system is ing radar performance. This millimeter-wave shown in Fig. 1. The radar transmits a frequency- radar incorporates a signal-processing unit in the modulated millimeter-wave signal, and the sig- radar head, resulting in a more compact, light- nal reflected by a target is received by the radar. weight radar system that is easy to install on By mixing the received and transmitted signals, vehicles. the system obtains a beat signal having a fre- The sensors for monitoring vehicle driving envi- ronments embody important technology for the Transmitted Received Intelligent Transport System (ITS). Sensing devices Frequency signal signal employed include the ultrasonic sensor, image-pro- cessing sensor, infrared lidar, microwave radar and millimeter-wave radar. Compared with other types ƒb1 ƒb2 Time of sensors, a millime