<?xml version="1.0"?><ownershipDocument><schemaVersion>X0101</schemaVersion>    <documentType>4</documentType><periodOfReport>2003-06-16</periodOfReport><issuer><issuerCik>0000026537</issuerCik><issuerName>SENSYTECH INC</issuerName>        <issuerTradingSymbol>STST</issuerTradingSymbol></issuer><reportingOwner><reportingOwnerId><rptOwnerCik>0001241361</rptOwnerCik><rptOwnerName>SEMPLE LLOYDE A</rptOwnerName></reportingOwnerId><reportingOwnerAddress><rptOwnerStreet1>  </rptOwnerStreet1><rptOwnerStreet2>  </rptOwnerStreet2><rptOwnerCity>  </rptOwnerCity><rptOwnerState>  </rptOwnerState><rptOwnerZipCode>  </rptOwnerZipCode></reportingOwnerAddress><reportingOwnerRelationship><isDirector>1</isDirector><isOfficer>0</isOfficer><isTenPercentOwner>0</isTenPercentOwner><isOther>0</isOther><officerTitle></officerTitle><otherText></otherText></reportingOwnerRelationship></reportingOwner><derivativeSecurity><securityTitle><value>Stock Option (Right to buy)</value></securityTitle><conversionOrExercisePrice><value>11.37</value></conversionOrExercisePrice><transactionDate><value>2003-06-16</value></transactionDate><transactionCoding><transactionFormType>4</transactionFormType><transactionCode>A</transactionCode><equitySwapInvolved>0</equitySwapInvolved></transactionCoding><transactionTimeliness><value></value></transactionTimeliness><transactionAmounts><transactionShares><value>10000</value></transactionShares><transactionValue><value>0</value></transactionValue><transactionAcquiredDisposedCode><value>A</value></transactionAcquiredDisposedCode></transactionAmounts><exerciseDate><value>2004-05-13</value><footnoteId id="F1" /></exerciseDate><expirationDate><value>2013-05-13</value></expirationDate><underlyingSecurity><underlyingSecurityTitle><value>Common Stock</value></underlyingSecurityTitle><underlyingSecurityShares><value>10000</value></underlyingSecurityShares></underlyingSecurity><postTransactionAmounts><sharesOwnedFollowingTransaction><value>10000</value></sharesOwnedFollowingTransaction></postTransactionAmounts><ownershipNature><directOrIndirectOwnership><value>D</value></directOrIndirectOwnership></ownershipNature></derivativeSecurity><footnotes><footnote id="F1">The options may be exercised in whole or in part on or after May 13, 2004.  In the event of a Change in Control, the options immediately shall become exercisable in full.</footnote></footnotes><ownerSignature><signatureName>/s/ Lloyd A. Semple</signatureName><signatureDate>2003-06-16</signatureDate></ownerSignature></ownershipDocument>

