Vehicle-mounted FMCW imaging is the key technology for autonomous vehicle,which features wide beam-width and ultra-wide band antenna.The abnormal imaging method based on distance compressive and azi-muth beamforming was not are not valid any more for serious migration through resolution cell in the near field.In order to achieve the azimuth high resolution,the back projection imaging algorithm was proposed.Firstly,the delay time between pixels and antennas in the imaging field is calculated.Secondly,the echo signal was interpolated.According to the delay time,the coherent integration was obtained.The BP algorithm was just related to the delay time and applicable for near field imaging.Last,the theory is deduced and the feasibility and validity of the method are proved by simulation.
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