数字化同步检波的新方法

针对模拟同步检波方法的不足,提出了利用谱分析方法实现数字化同步检波。数字化同步检波方法消除了模拟同步检波方法中回波信号与参考信号的相位差对检波结果的作用,抑制了噪声对结果的影响,并提高了抗邻频干扰的能力。在具体实现上,采用了滑动离散博立叶变换(DFT)算法,使运算量大大降低。同时,利用软件实现使得系统更具灵活性。该方法在高速数字信号处理(DSP)平台上得到了验证。采用数字检波方法增强了接收机的处理能力,提高了引信动作的可靠性和稳定性,具有良好的应用前景。

A New Method of Digital Synchronous Demodulation

Based on the analysis of conventional analog synchronous demodulation,a method of implementing digital synchronous demodulation by using spectrum analysis technology is presented,which overcomes the disadvantages of analog synchronous demodulation.The method eliminates the effect of phase difference between echo signal and reference signal on demodulation result,restrains the influence of noise on the result,and improves the performance of anti-jamming to adjacent frequencies.In order to decrease the calculational complexity,the sliding discrete fourier transform(DFT) technology is introduced.Therefore the systematical configuration of the programmable software is more flexible.The proposed scheme is implemented on a high speed digital signal processing(DSP) platform,and the results indicate that the method is effective and flexible.The method enhances the processing performance of receiver and improves the reliability and stability of fuse action.