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IWR1443: iwr1443测15m之内的目标,测距误差随着距离增大而增大,帮忙分析下原因?

Part Number: IWR1443

你好,

参考iwr1443的高精度测距demo,处理过程为FFT,找到目标峰,以目标峰的bin点为中心,取前后几个bin点配置HWA做DFT进行插值,提高精度。

由于DFT的分辨率是16384,所以理论上16m之内的目标是可以达到1mm精度的,但是实际测试发现,距离增大,误差会变大,会到2cm,请帮忙分析下大概是什么原因引起的呢??