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本文简述了用快速Fourier变换(FFT)来实现数字多波束的原理和在近场对球面波前聚焦的必要性。为使定点专用处理机满足聚焦运算所需要的宽的表数范围,作者提出了变比例因子法并于以具体实现。最后介绍了研制结果。
This paper describes the principle of using digital Fourier transform (FFT) to realize digital multibeam and the necessity of focusing on spherical wavefront in the near field. In order to make the fixed-point special-purpose processor satisfy the wide range of tables required for the focus operation, the author proposes a scaling factor method and implements it in detail. Finally introduced the research results.