中文摘要：

根据虚拟无线电技术的特点和发展趋势,从锁相环路基本原理出发,建立了一种适用于软件实现的数学模型,给出了在数字化实现过程中需要注意的一些问题,以及系统参数的选择方法和性能度量指标。通过MATLAB软件仿真,验证了该方法的有效性和可行性,并列举了在金属探测仪项目中的应用实例。

英文摘要：

According to the characteristics and trend of virtual radio technology and starting from the basic principles of PLL this paper proposes a mathematical model suitable for software implementation,gives some issues necessary to pay attention to in digital realization,and the selection methods for system parameters and the performance measurement indexes.The result of MATLAB simulation shows that this method is effective and feasible.Finally,the application example of the method in metal detector project is presented.