数字多波束天线精密测距精度分析

针对数字多波束天线在精密测距应用中所遇到的多通道信号合成处理问题,分析了单元天线相位中心、阵列天线相位中心、通道间时延不一致性和天线孔径渡越时延对测距精度的影响,给出了通道间时延偏差与合成波束测距结果之间的关系,并进行了试验验证。研究表明:在一定范围内,各通道的时延偏差在波束形成输出端体现为统计平均效果,合成波束的整体测距误差会因统计平均效果而得到改善,合成波束测距误差也可以由通道时延的偏差来估计。

Analysis on Precise Ranging Performance of Digital Multi-beam Antenna

Considering the problem of multi-channel signal processing of digital multi-beam antennas in ranging applications,the influence of element phase center,array phase center,channel delay differences and antenna aperture transition time on ranging accuracy is analyzed,the relationship between channel delay differences and beam ranging results is given,and the test results are presented.It is shown that in a certain range,beam ranging error is the statistical average of channel delay differences,and so the beam ranging accuracy can be improved.