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LAUNCHXL-CC26X2R1: 关于AOA算法的问题?

Part Number: LAUNCHXL-CC26X2R1

 你好,在5.10SDK的rtls_master中,我看到算法里面有AOA_AngleComplexProductComp这个函数,其中Zre = Xre*Yre + Xim*Yim; Zim = Xim*Yre - Xre*Yim;这两个公式能不能帮忙解释一下。

 

  • 这是下图中的IQ复数运算,公式如下,上面公式是计算分别得到实部和虚部

    int32_t AOA_AngleComplexProductComp(int32_t Xre, int32_t Xim, int32_t Yre, int32_t Yim)
    {
      int32_t Zre, Zim;
      int16_t angle;
    
      // X*conj(Y)
      Zre = Xre*Yre + Xim*Yim;
      Zim = Xim*Yre - Xre*Yim;
    
      // Angle. The angle is returned in 256/2*pi format [-128,127] values
      angle = AOA_iatan2sc((int32_t) Zim, (int32_t) Zre);
    
      return (angle * angleconst);
    }