摘要
为了解决电子战接收机中雷达信号脉内调制方式的自动识别问题,提出了一种基于FPGA平台的实用调制类型识别方法。首先对高速率中频直接采集信号进行并行结构数字下变频预处理,采用基于频域特性的粗识别,区分出线性调频(LFM)和频移键控(FSK)信号。其他信号通过对低采样率基带解析信号,用瞬时自相关求相位差的方法,对相移键控(PSK)信号进行准确识别。该方案实时性好,可信度高,在FPGA平台上实现可满足高采样率电子战数字接收机的需求。
In order to automatically recognize different modulation types of radar pulses in EW digital receiver,a practical method of modulation recognition based on FPGA is proposed. Firstly,the frequency conversion preprocessing of high-speed in-termediate frequency direct acquisition signal is performed. LFM and FSK signals are distinguished by the rough recognition based on frequency characteristic. Then baseband PSK signals sampled at the low speed are precisely recognized with a new algo-rithm of instantaneous autocorrelation to get phase difference. The method has good real-time performance and high reliability, and can meet the need of high sampling rate EW digital receivers if it is implemented on FPGA.
出处
《现代电子技术》
2013年第21期9-14,共6页
Modern Electronics Technique
基金
863项目基金资助(2012AA7031014D)
关键词
脉内调制
DDC
并行结构
瞬时自相关
FPGA
intra-pulse modulation
DDC
parallel architecture
instantaneous autocorrelation
FPGA
