基于误差校正的双频连续波测距性能分析

针对正交解调接收机通道不平衡的校正问题,利用双频连续波雷达基于快速傅里叶变换比相测距的特点,提出了一种正交解调误差的频域校正方法。首先基于频域分析求出所需要的校正系数,然后实现正交解调误差的校正,达到提高连续波雷达测距性能的目的。通过仿真验证了校正方法的有效性,校正系数的估计方差与克拉美-罗界渐进一致。通过校正后,由通道不平衡引起的测距系统误差被有效地解决,从而改善了双频连续波雷达的测距性能。

Performance Analysis of Dual Frequency CW Ranging Based On Error Correction

Quadrature demodulation receiver has errors necessarily when producing in-phase (I)and quadrature (Q)compo- nents.Based on the features of dual frequency CW radar ranging by FFT phase comparison,this paper proposes a new method for quadrature demodulation errors correction in frequency domain.First correction coefficients are computed by spectrum analysis.Then quadrature demodulation errors are calibrated.Simulation results prove the validity of the new method.Estimated variances of correc- tion coefficients and their CRLB are asymptotically consistent.Ranging performance before and after correction is compared.