<?xml version="1.0"?><ownershipDocument><schemaVersion>X0201</schemaVersion>    <documentType>4</documentType><periodOfReport>2003-09-08</periodOfReport><notSubjectToSection16>0</notSubjectToSection16><issuer><issuerCik>0000026537</issuerCik><issuerName>SENSYTECH INC</issuerName>        <issuerTradingSymbol>stst</issuerTradingSymbol></issuer><reportingOwner><reportingOwnerId><rptOwnerCik>0001079175</rptOwnerCik><rptOwnerName>PERRINO S R</rptOwnerName></reportingOwnerId><reportingOwnerAddress><rptOwnerStreet1>6319 CHAUCER VIEW CIRCLE</rptOwnerStreet1><rptOwnerStreet2></rptOwnerStreet2><rptOwnerCity>ALEXANDRIA</rptOwnerCity><rptOwnerState>VA</rptOwnerState><rptOwnerZipCode>22304</rptOwnerZipCode><rptOwnerStateDescription></rptOwnerStateDescription></reportingOwnerAddress><reportingOwnerRelationship><isDirector>1</isDirector><isOfficer>0</isOfficer><isTenPercentOwner>0</isTenPercentOwner><isOther>0</isOther></reportingOwnerRelationship></reportingOwner><nonDerivativeTable><nonDerivativeTransaction><securityTitle><value>Sensytech, Inc. Common stock</value></securityTitle><transactionDate><value>2003-09-08</value></transactionDate><deemedExecutionDate><value>2003-09-08</value></deemedExecutionDate><transactionCoding><transactionFormType>4</transactionFormType><transactionCode>S</transactionCode><equitySwapInvolved>0</equitySwapInvolved></transactionCoding><transactionTimeliness><value></value></transactionTimeliness><transactionAmounts><transactionShares><value>25000</value></transactionShares><transactionPricePerShare><value>20.18</value></transactionPricePerShare><transactionAcquiredDisposedCode><value>D</value></transactionAcquiredDisposedCode></transactionAmounts><postTransactionAmounts><sharesOwnedFollowingTransaction><value>596596</value></sharesOwnedFollowingTransaction></postTransactionAmounts><ownershipNature><directOrIndirectOwnership><value>D</value></directOrIndirectOwnership></ownershipNature></nonDerivativeTransaction></nonDerivativeTable><footnotes></footnotes><remarks></remarks><ownerSignature><signatureName>S. R. PERRINO</signatureName><signatureDate>2003-09-09</signatureDate></ownerSignature></ownershipDocument>

