3 . an improved algorithm directly designing the fir ( finite impulse response - . fir ) filter fan to realize time domain wcbb is presented 提出了通过直接设计fir ( finiteimpulseresponse ： fir )滤波器组来实现时域恒定束宽波束形成器的改进方法。
Here a scheme to implement broad - band constant beamwidth digital beam - former has been presented . the results of computer simulation show the scheme is effective 本文给出了一种宽带恒定束宽数字波束形成器的实现方案，计算机仿真结果表明了该方案的有效性。
Based on multi - beam outputs of a time domain wcbb , a time domain wideband high resolution doa estimation method that can be used for arbitrary array is proposed 基于时域恒定束宽波束形成方法，提出了可应用于任意阵列在时域实现的宽带源高分辨方位估计算法。
4 . the effects of array mismatch errors on time domain wcbb based on ideal array model is thoroughly studied via computer simulations and water tank experiments 利用计算机仿真和水池实验，深入分析了阵列模型失配对基于理想阵列模型设计的时域恒定束宽波束形成器性能的影响。
6 . the broadband coherent high resolution processing method based on constant beamwidth beamformers and the incoherent high resolution processing method based on subband beamformers are studied 研究了基于恒定束宽波束输出的宽带相干高分辨处理方法和基于子带波束输出的宽带非相干高分辨处理方法。
In the designing procedure , sidelobe and mainlobe regions are considered separately . by computer simulations , it is shown that the algorithm can give more accurate wcbb designing results with low - order fir filter fan compared to traditional methods 仿真实验表明，与原有方法相比，此方法可以使用较低阶次的fir滤波器实现高精度的时域宽带恒定束宽波束形成器。
Simulation results show that the weighted orthogonal converting matrix not only has good performance on constant beam - width , but also has the same performance on resolution and estimation as those of common orthogonal converting matrix . 5 并且仿真实验验证了加权正交化恒定束宽波束形成矩阵既具有良好的恒定束宽性能，又具有与一般正交化恒定束宽波束形成矩阵相近的分辨性能和估计性能。
Aiming at the practical applications on engineering , the dissertation studies the theories and application technologies of constant beam - width beam - former and doa estimation for wideband signals . the main results and achievements are summarized as follows : 1 论文从实际工程应用的角度出发，系统研究了恒定束宽波束形成和宽带高分辨阵列信号处理的相关理论和实现技术，主要研究内容包括： 1
Lake - experiment verified the correctness of this low sidelobe level beamformer . 4 . the broadband constant beamwidth beamforming vectors for a uniform linear array are designed and its effectiveness when applied to a real array is verified by water tank experiment 针对均匀分布线列阵，设计了基于chebyshev加权的宽带恒定束宽波束形成向量，消声水池实验验证了设计方法对于实际基阵的有效性。
In the broadband incoherent beamspace high resolution method , the outputs of mvdr beamformers are used to suppress the interference from outside the beam coverage region in each subband . computer simulation results show good performance at low signal to noise ratio ( snr ) 该方法克服了基于预成恒定束宽波束输出的宽带相干高分辨处理方法不能有效抑制波束区域之外强于扰的不足，仿真结果表明该方法在低信噪比具有良好的性能c
