摘要
分析了模拟延时线的量化误差会造成信号功率及信号距离分辨率的降低,在基于子阵和发射为线性调频信号的前提下,提出了一种宽带数字接收波束形成方法.该方法先对接收信号拉伸处理和低通滤波,然后在子阵间时域相位加权实现宽带数字波束形成.低通滤波后的数字采样和信号处理均可在低的速率下进行,大大降低了运算量且容易实现.通过计算机仿真得出,数字方法消除了量化误差的影响,波束形成性能比模拟延时线方法有较大的提高.
Analog time delay units （TDUs） are usually used for wideband phased array beamforming. but quantization error and high cost restrict their applications. This paper analyses first the fact that TDUs quantization error will reduce signal power and range resolution, and then a new wideband digital beamforming method using subarrays and linear frequency modulation（LFM） signal is proposed. The algorithm, which implements the stretch processing and narrowband filtering technique, achieves digital beamforming by weighting inter-subarrays in the time domain. Lowpass filtering limits the bandwidth Of the signal prior to digitization and signal processing, reducing the required speed of subsequent digitization and the computing burden. Finally, computer simulatioins demonstrate that digital beamforming eliminates the effect of quantization error and has better performance than the analog TDUs method.
出处
《西安电子科技大学学报》
EI
CAS
CSCD
北大核心
2006年第6期970-974,共5页
Journal of Xidian University
基金
国家部委科技自然基金资助项目(51407010101DZ0116)
关键词
宽带相控阵
数字波束形成
量化误差
拉伸处理
wideband phased array；digital beamforming
quantization error
stretch processing
