摘要
对于宽带信号接收波束形成,为了降低阵列中各传感器接收通道时延和相位不一致性对性能的影响,提出了一种稳健的宽带信号接收波束形成方法。首先根据接收波束指向对阵列中各传感器信号的空间时延差进行补偿,然后利用短时傅立叶变换对阵列中各传感器信号进行子频带划分,并对各子频带所有传感器信号的时延和相位进行调整并相干合成,最后将相干合成后的子频带信号综合为宽带时域波束。针对宽带线性调频信号的计算机仿真实验表明,相比于传统的波束形成方法,所提方法能够显著提高宽带信号的合成效率。
As for receive beamforming of wideband signal, in order to lower the influence of the delay and phase disagreement among the receiver channels of array sensors,a method of robust receive beamforming of widcband signals is proposed. Firstly, the delay differences among sensors resulted from the propagation in space were compensated according to the beam pointing. Secondly, signals of all sensors were channelized into many different frequency bands using short time Fourier trans- form （STFT）. Thirdly, the delays and phases of each frequency band of all sensors were adjusted and then synthesized coherently. Finally, the synthesized signals of all frequency bands were inte- grated into the time-domain wideband signal. The computer simulation on the wideband linear frequency modulation signal shows that the proposed method can greatly increase the combination efficiency of wideband signals compared with the traditional beamforming method.
出处
《载人航天》
CSCD
2013年第6期64-68,共5页
Manned Spaceflight
基金
中国人民解放军总装备部十二五预研项目
