提出了一种基于FPGA的中频数字接收机的设计方案。该方案首先采用FFT检测频率峰值，然后进行带通滤波、正交变换。对正交变换后的信号用CORDIC算法计算瞬时相位，然后利用相位差分方法对频率进一步精确估计。文中详细描述了设计思路和各模块的FPGA实现方法，并进行了硬件仿真。仿真结果表明，该方案具有实时性强、脉冲参数测挝精度高的优点。

In this paper, a new FPGA-based method of designing digital IF receiver is proposed. In this method, the peak of frequency is first detected by FFT algorithm, then a band-pass filtering and a quadrature transform are done. After this, the instantaneous phase of the transformed signal is calculated by CORDIC algorithm. Finally the frequency is estimated in a more precise way by the phase differential method. The outline of the design and its realization in FPGA are described in detail. Hardware simulation results show that the method has advantages of real-time performance and precision in pulse parameter measurement.

TN957.5