• 1. fft arithmetic: fft算法
• 2. FFT correlation arithmetic: FFT互相关算法

• 1.This equation is adapted to any shape's input beam and can be easily realized using fft arithmetic.
  该方程对任意分布形式的输入光束具有普适性、并便于利用快速傅立叶变换算法实现。
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• 2.Comparing with the FFT and the amplitude measure arithmetic, the novel method can avoid the spectrum leakage and fence effect in ideal extent and improve the precision of harmonics measurement.
  与FFT和幅值检测法相比，该方法能消除fft算法的频谱泄露，提高了谐波检测的精度，且适用于含有非整数次谐波的信号。
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• 3.The principle of level measurement radar and the FFT/CZT arithmetic used to improve radar measurement precision in detail are introduced, and realization plan based on DSP is given.
  文中重点介绍了液位监测雷达的测距原理，采用FFT/CZT算法提高雷达测距精度并给出基于DSP实现方案。
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