MULTI-FREQUENCY, MULTI-TARGET, VEHICULAR COLLISION AVOIDANCE RADAR SYSTEM USING DIGITAL SIGNAL PROCESSING

摘要

A vehicular collision avoidance radar system using digital signal processing technique including a transmit section (202)that generates a two channel transmit frequency. An antenna (210) both transmits the transmit signal and receives a reflectedreceive signal. A Schottky diode mixer (208) generates a difference signal having a frequency equal to the transmit frequency minusthe receive frequency. A signal switch (304) in a front end electronics section (300) time demultiplexes and samples the channel 1and channel 2 signals. The samples are coupled to a two-channel analog to digital (A/D) converter (310). A digital electronicssection (500) receives the digital information and performs a Fast Fourier Transform (FFT) on each channel of digital data todetermine relative speed and range of a target based upon the frequency and the difference in phase of the two channels. The digitalelectronics section also receives information regarding the status of vehicle operation and/or controls to determine the degree ofdanger presented by an identified target.