一种高效、灵巧的多通信信号产生方法

A method of multi-signal generation with highly efficient,flexible characteristic

针对通信对抗复杂战场电磁环境模拟的要求,设计并实现了一种资源高效利用、样式灵活可变、参数实时可控的多通信信号产生方法。该方法经过高速缓存循环读取、通用数字正交调制、法罗滤波器内插和多通道信号合成后,产生多路不同体制、不同样式的通信信号来模拟复杂战场电磁环境。在XC6VLX240T FPGA上,对信号产生方法进行了软硬件[1]实现,通过DAC5688在140 MHz中频,60 MHz带宽内输出多路信号模拟。结果表明,该方法能够同时产生10路样式、码速率、幅度、频率均实时可变的常规、扩频、数据链或跳频通信信号,中频带外抑制优于60 dB,带内互调失真优于40 dB。

This paper proposes a design and implementation of multi-signal generation with highly efficient, flexible and real- time characteristic. The proposed method maks use of various technologies including digital quadrature modulation （DQM）, farrow filter interpolation, signal combination to simulate muhi-system and multi-mode communication signal enviroment. We implement all the designs to generate multi-signal scenes that gives frequencies between 110MHz and 170MHz in a standalone system including single FPGA and DAC5688 chips. The test results show that we can simultaneously generate 10 routine or spread spectrum signals with varaible modulation, code-rate, amplitude, frequency and phase. The DAC5688 output has a harmonic suppression up to 60dB out of instantaneous band, and suppression up to 40dB within instantaneous band.