相干信号频率和到达角联合估计的算法

基于均匀圆阵和四阶累积量,提出了一种相干信号频率和到达角联合估计的新算法。首先,利用计算量较小的PRO-ESPRIT算法和beamspace-ESPRIT算法分别估计广义阵列响应矢量和信号的频率。然后,对广义阵列响应矢量进行模式空间变换,并利用改进的前后向线性预测方法估计出相干信号的到达角。该算法能在色噪声环境下,精确地估计出空间相干信号的频率和到达角,并且无需平滑技术和谱峰搜索,具有计算量小,参数自动配对的特点。计算机仿真结果验证了算法的有效性。

A New Method for Joint Estimation of Frequency and DOA of Coherent Signals

Based on uniform circular array and fourth-order cumulant,a new algorithm for joint estimation of frequency and DOA of coherent signals is proposed.Firstly,the PRO-ESPRIT algorithm and beamspace-ESPRIT algorithm are used to estimate the generalized steering vectors and frequency of coherent signals respectively.Secondly,the generalized steering vectors are transformed by mode space,and the modified forward-backward linear prediction algorithm is used to estimate DOA of coherent signals.The algorithm can precisely estimate frequency and DOA of coherent signals in the colored Gaussian noise.Getting rid of the smoothing technique and the spectrum peak search,it has smaller computational load with parameters paired automatically.Computer simulation confirms its effectiveness.