一种高速跳频信号实时载频测量方法

A Method of Real-time Carrier Frequency Measurement of High-speed Frequency-hopping Signals

提出了一种二次载频测量方法,详细阐述了对高速跳频信号实时载频测量算法的工作原理。针对高速跳频信号特点,采用多路并行方法处理高速采样数据、快速傅里叶变换(Fast Fourier Transform,FFT)估计信号载频、数字正交下变频得到零中频信号。详细描述了基于可编程门阵列器件(Field-Programmable Gate Array,FPGA)的通过载频粗测、数字正交下变频、载频精测和载频合成的具体实现过程。以实际跳频信号为例,进行了仿真计算。结果表明设计稳定可靠、测量精度高。

In the paper,the basic principle of the secondary carrier frequency measurement is presented.Aiming at characters of high-speed frequency hopping signal,the sampling data is processed by using the multi-channel parallel method,the carrier frequency of signal is estimated by using the fast fourier transform（FFT）,and the zero intermediate-frequency signals are received by using a digital quadrature down-conversion mixer.And a real-time frequency measurement of high-speed frequency hopping signals based on the secondary carrier frequency measurement is implemented with FPGA.The simulation result shows that this design has higher stability,reliability and measurement accuracy.