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

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IS-GPS-705 CRMCID Originator/Org. Page/Para Importance Comment PO Resolution & Concurrence Notesin-band allocation defined in paragraph 3.3.1.1.67 Thomas NagleGPC68 Thomas NagleGPCPage: 15Para: 3.3.1.7.1Page: 15Para: 3.3.1.7.2SSRationale: Specify orbital users as well ascorrection to user polarization orientation.Comment: Specify the group delay uncertainty forblock III SVs.Suggested Change:Add “For Block III SVs, the effective uncertainty ofthe group delay shall not exceed 1.0 nanoseconds(two sigma). The uncertainty requirement shallbe valid for signal measurement/averaging timesof 10 milliseconds to 1 day.”From: 3.3.1.7.1 Group Delay Uncertainty. Theeffective uncertainty of the group delays shall notexceed 3.0 nanoseconds (two sigma).Final To: 3.3.1.7.1 Group Delay Uncertainty. Theeffective uncertainty of the group delays shall notexceed 3.0 nanoseconds (95% probability).Rationale: Use group delay uncertainty for blockIII SVs from IS-GPS-800A.Comment: Specify the group delay differential forblock III SVs. Suggested change: TO “For a givennavigation payload redundancy configuration, theabsolute value of the mean differential delay shallnot exceed 30.0 nanoseconds. The random plusnon-random variations about the mean shall notexceed 3.0 nanoseconds (two-sigma). For Block IIISVs, the absolute value of the mean differentialdelay shall not exceed 15.0 nanoseconds. Therandom variations about the mean shall notexceed 1.0 nanoseconds (two-sigma). Therandom variation requirement shall be valid forsignal measurement/averaging times of 10milliseconds to 1 day.”PO Resolution: RejectRationale: Will add to topics for discussion at theICWG; be prepared to provide rationale for tighteningthe requirement.Concurrence:Rationale:PO Resolution: A/CRationale: Rationale is insufficient for a change thatmay impact cost of the SV.Concurrence: ConcurRationale:(05/21/09): 8/6/09: ICC to get with Dr.Munoz for way forward. Analysis neededfor relationship between the SS-SS-800 docand ICD/IS's. 13-aug-09: this has beenpotentially accepted for the 705 document.A discussion will occur to determine if thereare users who have this need. this is aMITRE request. refer to AI#24 for wayforward. 27-aug-09: 200 ICC willcoordinate with the PSICA working group toattain rationale for the potentialcost/schedule impacts. 10sept-09: AI 24 isstill open this is still under review for the1ns.10/01/09: ICWG (AJ and Chris H) concurredwith leaving at 3.0 ns. Awaiting GPCconcurrence. 10/14/09: also confirmedthat the "(95% probability)" was replacedwith "(two Sigma)" . This was due to theconsensus of the ICWG that 95 % providesthe user with more data points that 2sigma.(05/11/09) GPC rejects PO resolution on thebasis that this information already existsinternal to the GPS-IIIA contractor. GPCthus recommends incorporation ofinformation from the GPS-IIIA LockheedMartin Navigation Payload PDR for theMean Differential Group Delay between anytwo RF chains. 8/6/09: GPU will go back tocomment originator to determine if there isan actual need for the tighter requirement.25-aug-09: this comment for the 200 CRM(#134) was withdrawn. ICC to follow suit.need GPC final concurrence. 10-sept-09:Comment #134 is withdrawn, thus this30
IS-GPS-705 CRMCID Originator/Org. Page/Para Importance Comment PO Resolution & Concurrence NotesFrom: From “For a given navigation payloadredundancy configuration, the absolute value ofthe mean differential delay shall not exceed 30.0nanoseconds. The random variations about themean shall not exceed 3.0 nanoseconds (twosigma).”Final To: The group delay differential between theradiated L1 and L5 signals (i.e. L1 P(Y) and L5 I5;and L1 P(Y) and L5 Q5) is specified as consisting ofrandom plus bias components. The meandifferential is defined as the bias component andwill be either positive or negative. For a givennavigation payload redundancy configuration, theabsolute value of the mean differential delay shallnot exceed 30.0 nanoseconds. The random plusnon-random variations about the mean shall notexceed 3.0 nanoseconds (95% probability), whenincluding consideration of the temperature andantenna effects during a vehicle orbitalrevolution.. L1 and L2 group delay differential isdescribed in 3.3.1.7.2 of IS-GPS-200. Correctionsfor the bias components of the group delaydifferential are provided to the users in the NAVmessage using parameters designated as TGD(reference paragraph 20.3.3.3.3.2 of IS-GPS-200)and Inter-Signal Correction (ISC) (referenceparagraph 20.3.3.3.1.2).comment will be withdrawn.10/01/09: This section has been modifiedreal-time at ICWG to be in synch with IS-GPS-200 10/14/09: The comment was notaccepted, however, ICC changed the POresolution to A/C since this section wasunder review at the last 10/1/09 ICWG.updated CRM69 Thomas NagleGPCPage: 16Para: 3.3.1.7.3SRationale: Tighten the specs for Block III SVs.Comment: Please provide the values for the SSVgroup delay differential.From: N/AFinal To: Suggested Change: Please provide thevalues.PO Resolution: RejectRationale: Per stakeholder agreement, values were tobe placed outside of this document. See Action Item# 22 for IS-GPS-800.Concurrence: ConcurGPC Rejects PO’s Resolution, againrequesting these values be provided in thisdocument. (05/21/09): 8/6/09: seecomment 135 from the 200 CRM forresolution. See AI #50 for resolution. 10-sept-09: AI #50 was closed. this commentmust be deferred since RIL item will beopened at a later time. changed the31
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DRAFT IS-GPS-705A Comment Resolution Matrix - GPS.gov

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