-You may like to process only those observations which are received first within a maximum of "Sync corr" seconds after the reception of a clock correction. Using only observations which come in sync with the corrections can avoid a possible high frequency noise of PPP solutions. Such noise could result from processing all observations regardless of how late after a clock correction they were received. +You may like to process only those observations which are received first within a maximum of 'Sync corr' seconds after the reception of a clock correction. Using only observations which come in sync with the corrections can avoid a possible high frequency noise of PPP solutions. Such noise could result from processing all observations regardless of how late after a clock correction they were received.