It　is　very　important　for　satellite　interference　source　to　have　accurate　positioning.　However,　the　key　to　positioning　is　parameter　estimation.　In　order　to　improve　the　positioning　accuracy　of　interference　source,　we　have　to　estimate　the　time　difference　parameters　accurately.　The　traditional　generalized　cross　correlation　method　improves　the　effective　components　of　signal　by　using　weighting　function　while　results　in　the　problem　of　time　difference　accuracy.　Furthermore,　in　cases　of　low　signal　to　noise　ratio,　its　estimation　performance　falls.　A　generalized　correlation　time　delay　estimation　algorithm　was　proposed　in　this　paper　based　on　the　second　correlation.　The　second　correlation　was　used　in　the　algorithm　to　deal　with　the　received　signal　and　suppress　interference　noise　effectively.　Then　the　result　of　the　second　correlation　by　using　generalized　cross　correlation　method　to　further　suppress　interference　noise　and　improve　the　signal　to　noise　ratio.　As　a　result,　the　time　difference　estimation　accuracy　was　improved.　©　2016,　Beijing　University　of　Technology.　All　right　reserved.