基于FPGA的IFF-MSK调制系统设计

A design of IFF-MSK system based on FPGA

为实现快速敌我识别,设计了一个MSK调制系统。从基本的MSK调制解调原理出发,研究了如何在解调端能快速有效地进行目标识别应答,创新性地提出了通过对发射端信号选用合适的扩频码码组进行MSK调制,而后在接收端不做解调做相关运算。充分利用了FPGA并行运算的工作特点,在解调端使用多通道并行相关识别模块,强相关信号将会产生波峰从而被判决门限识别输出,达到快速敌我应答的目的。

In order to realize the rapid identification of the enemy,an MSK modulation system is designed.Based on the basic MSK modulation and demodulation principle,how to quickly and effectively perform the target recognition response at the demodulation end is studied.It is innovatively proposed to select the appropriate spreading code group for the signal at the transmitting end before MSK modulation,then the receiving end does the correlation operation instead of performing demodulation.Make full use of the working characteristics of the FPGA about parallel computing,the multi-channel parallel correlation identification module is used at the demodulation end,and the strong correlation signal will generate a peak and would be recognized by the decision threshold to reach the purpose of responsing quickly between enemy and friend.