现代电子技术
現代電子技術
현대전자기술
MODERN ELECTRONICS TECHNIQUE
2013年
21期
9-14
,共6页
李涛%宿绍莹%陈曾平%郭骁
李濤%宿紹瑩%陳曾平%郭驍
리도%숙소형%진증평%곽효
脉内调制%DDC%并行结构%瞬时自相关%FPGA
脈內調製%DDC%併行結構%瞬時自相關%FPGA
맥내조제%DDC%병행결구%순시자상관%FPGA
intra-pulse modulation%DDC%parallel architecture%instantaneous autocorrelation%FPGA
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。
為瞭解決電子戰接收機中雷達信號脈內調製方式的自動識彆問題，提齣瞭一種基于FPGA平檯的實用調製類型識彆方法。首先對高速率中頻直接採集信號進行併行結構數字下變頻預處理，採用基于頻域特性的粗識彆，區分齣線性調頻（LFM）和頻移鍵控（FSK）信號。其他信號通過對低採樣率基帶解析信號，用瞬時自相關求相位差的方法，對相移鍵控（PSK）信號進行準確識彆。該方案實時性好，可信度高，在FPGA平檯上實現可滿足高採樣率電子戰數字接收機的需求。
위료해결전자전접수궤중뢰체신호맥내조제방식적자동식별문제，제출료일충기우FPGA평태적실용조제류형식별방법。수선대고속솔중빈직접채집신호진행병행결구수자하변빈예처리，채용기우빈역특성적조식별，구분출선성조빈（LFM）화빈이건공（FSK）신호。기타신호통과대저채양솔기대해석신호，용순시자상관구상위차적방법，대상이건공（PSK）신호진행준학식별。해방안실시성호，가신도고，재FPGA평태상실현가만족고채양솔전자전수자접수궤적수구。
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.
