信号分析仪中矢量信号分析设计

针对通信信号的矢量分析测试需求，借鉴国外先进仪表的解决方案，在高性能信号分析仪中开发了矢量信号分析功能。首先对输入信号进行超外差变频接收和A/D采样，然后在FPGA中完成高速数字下变频和数据整数倍抽取滤波，最后在上层应用软件中完成高精度数据重采样、宽带时域修正滤波、瞬态分析和前馈数字解调等多域矢量分析，并通过多级方式实现多域测试结果的配置和同步显示。实测结果表明采用本方案设计的矢量信号分析指标优异、配置灵活、测试结果丰富多样。

The design of vector signal analysis in signal analyzer

According to the demand of vector analysis of communication signals, and the solution of advanced foreign instruments, the vector signal analysis function is developed in the high performance signal analyzer. First the input signal is received by super heterodyne conversion and AD sampling, and then high speed digital down conversion and integer ratio decimation are completed in FPGA, finally, the application software performs high-precision resampling, time-domain filter correction, transient analysis and feed-forward digital demodulation, and realizes multi-domain test and synchronous display by way of multistage configurations. The experimental results show that the vector signal analysis based on this scheme is superior in function, flexible in configuration and rich in test results.