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

More documents

Recommendations

Info

IS-GPS-705 CRMCID Originator/Org. Page/Para Importance Comment PO Resolution & Concurrence Notescorrelation loss considered here is the totalallowable, associated with the L1 and L2 30.69MHz bandwidth RF signals transmitted by thepayload, for L1P(Y), L2 P(Y), CA and L2C, due tofiltering in the payload (e.g., multiplexers), plus alimited allowance (approximately 0.2 dB) for anyloss due to unexpected signal distortion caused byother payload electronics. This correlation losscan be demonstrated by comparing the codecorrelation powers from the payload signal withthose from a linear unfiltered signal generatorwhich emulates the payload signal formation andis free of correlation that is not an expected resultof signal combining. This comparison requiresequal RF power in a 30.69 MHz bandwidth fromboth the payload and waveform generator, andthe use of a correlating receiver with anapproximate ideal filter. The difference incorrelation power from this comparison is thedefined payload correlation loss.The total allowable correlation loss, which is afunction of signal and receiver bandwidth, shallbe:For L5: 0.6 dB (With a 30.69 MHz BW Rcvr)0.4 dB (With a 24 MHz BW Rcvr)From: 3.3.1.2 Correlation Loss. Correlation loss isdefined as the difference between the SV powerreceived in a 24 MHz bandwidth and the signalpower recovered in an ideal correlation receiver.The worst case correlation loss occurs when the I5carrier is modulated by the sum of the I5-codeand the NAV data stream. For this case, thecorrelation loss apportionment shall be as follows:1. SV modulation and filter imperfections: 0.6 dB2. Ideal UE receiver waveform distortion (due to24 MHz filter): 0.4 dBFinal To: Correlation loss is defined as thedifference between the SV power received in the60
IS-GPS-705 CRMCID Originator/Org. Page/Para Importance Comment PO Resolution & Concurrence Notesbandwidth defined in 3.3.1.1 (excluding signalcombining loss) and the signal power recovered inan ideal correlation receiver of the samebandwidth using an exact replica of the waveformwithin an ideal sharp-cutoff filter bandwidthcentered at L5, whose bandwidth corresponds tothat specified in 3.3.1.1 and whose phase is linearover that bandwidth. The correlation lossapportionment due to SV modulation and filteringimperfections shall be 0.6 dB maximum.160 C. ChuiAerospacePage: 12Para: Table 3-IIICRationale: Solve the problems stated in Comments(1) and (2)Comment: The Block IIIA I5 and Q5 powers givenin Table 3-III agree with the numbers given inTable 3-XI of SS-SS-800C numerically. However,the received powers listed in Table 3-XI of SS-SS-800C are “effective received signal powers” whichare “referenced to a receiver whose correlationoutputs are calibrated against an RF signalwithout combining loss”. To approve SS-SS-800Clast August, an agreement was reached at thattime that the next update of IS-GPS-705 wouldprovide a detailed definition of the referencereceiver, which is not provided in the currentupdate. Suggested Change: Based on the latestinput, it appears that the L5 signals will not begenerated using a majority combining scheme.The need to use a reference receiver to define thereceived L5 signal powers requires a discussionand resolution by the L5 ICWG and Space SegmentTeam.From:PO Resolution: RejectRationale: ICC POC is unaware of any agreements.Please provide details and resubmit.Concurrence: ConcurRationale:04/28/09: Accept with comment. Thereference for the minimum powerspecifications in SS-SS-800 and the IS-GPS-200 need to be consistent. 05/01/09:Accept the 04/28/09 PO resolution with thefollowing condition: Provide the definitionof the Reference Receiver and establish aclear relationship between the “effective”received powers of I5 and Q5 given in Table3-XI of SS-SS-800C and the received powersat the output of the reference receivingantenna within the bandwidth described inTable 3-III. 20-aug-09: it was decided thatthe details of the "reference receiver" willnot go in this icd, thus the comment mustbe rejected. Commenter concurs withresolution. This also inline with the 200CRM resolution.ICC to continue to workwith B. Chiu to collaborate with LM inattaining his needed info.Final To:Rationale: Make sure the -157 dBW given in IS-61
Page 4 and 5:
IS-GPS-705 CRMCID Originator/Org. P
Page 6 and 7:
Page 8 and 9:
Page 10 and 11: IS-GPS-705 CRMCID Originator/Org. P
Page 72: IS-GPS-705 CRMCID Originator/Org. P
show all

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

Create successful ePaper yourself

Delete template?

Save as template?