基于多特征和層級網(wǎng)絡的LPI雷達信號識別

打開文本圖片集

中圖分類號：TN974-34 文獻標識碼：A 文章編號：1004-373X（2025）17-0055-06

Abstract：AnLPIradar signal modulation patern recognition method basedonmulti-featureand hierarchical networksis proposedtometthechallengesbroughtbyLPIradarsignalstosignaldetectionandrecognition.Thecharacteristicsofradar signalswithdiffrentmodulationpaternsaretakenintoaccountcomprehensively.Firstlythesignalambiguityfunctinwith strongrepresentationabilityisusedasthemain feature todistinguish modulationpaterns.OnthebasisofGausianfiltering noisereduction，theatentionmechanismisconstructedtoidentifytheclasificationofnetworksignalsinadvance.Secondly sincethesignalambiguityfunctionbasedonautocorelationfunctionisdificulttodistinguishsomesignalmodulationpaterns efectively，thshort-timeFouriertransforimages（Ss）areselectedastheriginalfeaturesofthisindofsigals，anda secondary network including stackeddepth encoders isconstructedfor noisereductionreconstruction，featureenhancemntand clasificationrecogitionandtheodulationaterecogitionofdarsigalsisompleted.Finalltheproposedthodwas verifiedby simulation experiments.Thesimulationresults show that when the SNR （signal-to-noise ratio）is above -7 dB，the average recognition rate of the proposed methodis higher than 93.25% for8 typical LPI signals including polyphase coding and polytime coding.The validity of the proposed method has been verified.

KeyWords：LPIadarsignal;modulationpaternrecognition;ambiguityfunction;STF;mult-feature;hierarchicaletwork

0 引言

LPI雷達信號因具備低截獲和低識別概率的優(yōu)勢，成為了當前雷達信號的主要發(fā)展方向，也給作為雷達對抗中重要環(huán)節(jié)的雷達信號識別帶來了嚴峻挑戰(zhàn)。（剩余6870字）