基于FIFO和数字包络解调的脉内测频方法

Method of frequency measurement of radar pulse based on the FIFO and digital envelope demodulation

依据等精度频率测量原理,提出了在FPGA内部运用FIFO、数字包络解调和多路移相时钟等技术的新型脉内测频方法,实现窄脉宽中频调制脉冲的频率测量,适用于脉冲雷达等瞬时测频系统。同时,也可实现对多个调制脉冲的测频计数值累加求平均,以达到更高的测量精度。此设计方案硬件电路结构简单、成本低,系统集成度高、稳定性好,实用性强。

In this paper,based on the measure theory with uniform precision,a novel frequency measure method of the radar pulse is introduced,which uses the technologies of the FIFO,digital envelope demodulation,multi-rutes phase shifted clocks and etc,it can successively measure the frequency of the narrow modulation pulses and is applicable for the instantaneous frequency system in the pulse radar.Also it can add the counters of several modulation pulses to improve the measurement accuracy. The simple structure of the hardware,high stability,integration and practicability are the characteristics of the design.