RADAR SYSTEM FOR MULTIFREQUENCY AND MULTITARGET VEHICLE USING DIGITAL SIGNAL PROCESSING

摘要

PURPOSE: To provide a low-cost automobile radar system operating effectively and stably. CONSTITUTION: The radar system 100 uses a digital signal processing technique having a transmission section for generating two-channel transmitting frequencies. An antenna transmits a transmission signal and receives reflected receiving signal. A mixer generates a difference signal obtained by subtracting the receiving frequency from the transmitting frequency. The signal switch of a front end electronic device section 300 time multiplex separates channel 1 and channel 2 signals, and samples it. The sampled signals are transmitted to a channel A-D converter. A digital electronic device section 500 receives digital information, FFT calculates in the channels of the digital data, and decides the relative speed and distance of the targets based on the frequency and phase difference of the two channels. The section 500 receives the information regarding the drive control state of the vehicle, and decides the risk of the identified target.