Abstract:This paper analyzes the theory of decimation filtering and designs a CIC filter suitable for hardware implementation in continuous wave speed radar based on the principle of CIC filtering. Using various tools, both a conventional FIR filter and a CIC filter are designed to compare their decimation filtering effects. It can be seen from the output spectrum that, with the same equivalent impulse response length, the CIC filter is more efficient than the ordinary FIR filter, which can save computation and achieve better filtering performance.