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24-GHz frequency modulated/continuous wave automotive radar designed for collision warning

A frequency modulated/continuous wave (FM/cw) radar developed for automotive applications is described in this paper. The objective of this effort was to design a low-cost automotive collision warning radar that could be operated under Part 15 of the U.S. Federal Communications Commission regulations regarding intentional radiators including proximity sensors. In this paper, we describe a forward looking homodyne FM/cw 24.125 GHz radar with a digital signal processor (DSP). The data is collected while the FM/cw transceiver is modulated with several linear chirps of differing bandwidths and modulation slopes. The processor uses this data to calculate the range and Doppler velocity of multiple targets for the purpose of finding the safe following distance that should be kept between the host vehicle and targets. The system specifications and the effects of power and bandwidth on radar performance are shown. The ambiguity function of the homodyne transceiver and FFT spectral processor are shown along with the method of resolving these ambiguities for multiple targets. Data are presented showing radar measurements of a conducting sphere and test vehicle.