基于小波阈值去噪和共轭模糊函数的时频差联合估计算法

为了解决二阶互模糊函数对相关噪声处理的局限性问题，以及基于四阶累积量的联合估计算法的运算量大的问题，该文利用小波阈值去噪方法结合非圆信号的特性，提出一种新的时频差联合估计算法。该方法首先对接收信号进行小波阈值去噪，然后构造共轭模糊函数，最后再进行2维搜索，得到时差和频差参数。仿真实验给出不同信噪比下的参数估计结果，得出这种算法能抑制相关噪声，又能相对降低运算复杂度，并且在较低信噪比下也能做出准确估计。

A Joint Estimation Algorithm of TDOA and FDOA Based on Wavelet Threshold De-noising and Conjugate Fuzzy Function

To solve the problem that the second-order fuzzy function can not deal with related noise, as well as the problem of large computation based on fourth-order cumulants joint estimation algorithm, this paper proposes a new joint estimation algorithm of TDOA and FDOA by using wavelet thresholding denoising method combined with characteristics of non-circular signals. The method operates firstly wavelet thresholding denoising for the received signal, then constructs conjugate fuzzy function, and finally two-dimensional search is made to obtain the time difference and frequency difference parameters. The simulation experimental results under different signal-to- noise ratio show that the proposed algorithm can not only suppress correlated noise, but also has relatively lower computational complexity and also can make accurate estimation under low signal-to-noise ratio.