DRAFT IS-GPS-705A Comment Resolution Matrix - GPS.gov

IS-GPS-705 CRMCID Originator/Org. Page/Para Importance Comment PO Resolution & Concurrence Notes17 Thomas NagleGPCPage: 55Para:20.3.3.1.1SRationale: Correction.Comment: ICD does not define the Integrity StatusFlag. Suggested Change: Add text to paragraph20.3.3.1.1 to describe the Integrity Status Flag asshown in the attached draft PIRN-705-XXX(ISF).From: N/AFinal To: The CNAV message will containinformation that allows users to operate whenintegrity is assured. This is accomplished using anintegrity assured URA value in conjunction with anintegrity status flag. The URA value is the RSS ofURAoe and URAoc; URA is integrity assured to theenhanced level only when the integrity status flagis “1”.Bit 272 of Message Type 10 is the Integrity StatusFlag (ISF). A "0" in bit position 272 indicates thatthe conveying signal is provided with the legacylevel of integrity assurance. That is, theprobability that the instantaneous URE of theconveying signal exceeds 4.42 times the upperbound value of the current broadcast URAindexvalue, for more than 5.2 seconds, without anaccompanying alert, is less than 1 x 10-5 per hour.A "1" in bit-position 272 indicates that theconveying signal is provided with an enhancedlevel of integrity assurance. That is, theprobability that the instantaneous URE of theconveying signal exceeds 5.73 times the upperbound value of the current broadcast URAindexvalue, for more than 5.2 seconds, without anaccompanying alert, is less than 1 x 10-8 per hour.The probability associated with the nominal andlower bound values of the current broadcast URAindex are not defined.In this context, an "alert" is defined as anyindication or characteristic in the conveying signal,PO Resolution: A/CRationale: 5/23/08 comment and will incorporate intodocument. However, a working group will be createdto discuss further.Concurrence: ConcurRationale:06/20/08: Changes added to document. 06-sept-09: ICC confirmed that the additionaltext for ISF is in the document. 10-sept-09:this proposed text from the PIRN has minordifferences as shown in the "To" field of thiscomment. Stakeholders concur. changedPO resolution to A/C 10/14/09: Alsoadditional text was added to synchronizewith the 800 document. The new textadded from the 10/1/09 ICWG is in blue. Itis also noted that the URA "value" wasreplaced with URA "index" on twooccurances in the second paragraph startingwith the text "Bit 272 of Message Type 10 isthe Integrity..."18