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

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