| Automotive anti-collislon radar is a study hotspot nowadays, and it's able to advance modernization in traffic safety field. With the rapid development for highroad constructing, the prevention against traffic accident has been attracting people's attention more and more. Automotive anti-collislon radar is one of the effective approaches to reduce crashes and improve traffic safety status, so it seems exigent to do research and development for anti-collislon radar.This paper has studied some key technology in the automotive anti-collislon radar system. LFMCW is chosen for the radar working mode. The 2-antenna detecting mode is proposed to solve the long-standing problem of big detecting scope and low false alarm being hardly considered at the same time. Aiming at the clutter problem in the radar's working course, the system utilizes MTI to filter fixed clutter. And the method combining range-velocity decoupling with velocity threshold is adopted to filter moving clutter because of the radar's biggish working cycle. LFMCW radar has the range-velocity coupling problem, which disturbs the radar's exact ranging. It's a troublesome matter to implement range-velocity decoupling in multi-target circumstance. Considering the advantage and disadvantage of velocity pairing and area pairing in automotive anti-collislon radar application synthetically, this paper proposes the signal processing method combining velocity pairing with area pairing to implement the exact measure for targets'distance and velocity. Due to the process of steering, automotive anti-collislon radar may be interfered by the radar on vicinal vehicles, anti-interference for automotive anti-collislon radar is studied in this paper.This paper provides theory base and thought method for developing finished product of automotive anti-collislon radar, and also lays the groundwork for follow-up study work. |
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