Values over the one week interval of 1017 june 2000

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Unformatted text preview: tandard. Page A-11 October 2001 GPS SPS Performance Standard Table A-2-4. JPL C/A to P(Y) Code Phase Bias Information – May 2000 PRN Average High Low Spread Variance 2 (m) Value (m) Value (m) (m) (m ) 1 -0.105 0.04 -0.23 0.27 0.053 2 -0.347 -0.2 -0.45 0.25 0.05 3 0.011 0.17 -0.08 0.26 0.051 4 0.388 0.53 0.29 0.24 0.051 5 -0.223 -0.07 -0.35 0.28 0.052 6 0.137 0.3 0.03 0.27 0.059 7 -0.376 -0.04 -0.5 0.46 0.077 8 -0.291 -0.13 -0.4 0.26 0.055 9 0.084 0.25 -0.04 0.29 0.061 10 -0.556 -0.41 -0.65 0.24 0.051 13 0.485 0.63 0.4 0.24 0.049 14 0.088 0.23 -0.03 0.27 0.052 15 -0.375 -0.23 -0.48 0.25 0.053 16 -0.26 -0.12 -0.36 0.24 0.051 PRN Average High Low Spread Variance 2 (m) Value (m) Value (m) (m) (m ) 17 -0.329 -0.16 -0.45 0.29 0.066 18 -0.004 0.14 -0.12 0.26 0.057 19 0.085 0.23 -0.02 0.25 0.056 21 -0.14 0.01 -0.24 0.25 0.052 22 -0.48 -0.33 -0.58 0.24 0.052 23 -0.178 -0.05 -0.27 0.22 0.049 24 0.064 0.21 -0.04 0.25 0.052 25 0.215 0.38 0.09 0.29 0.064 26 0.369 0.52 0.28 0.24 0.049 27 -0.033 0.12 -0.16 0.28 0.056 29 0.257 0.4 0.17 0.23 0.051 30 0.498 0.64 0.4 0.24 0.049 31 -0.223 -0.08 -0.32 0.24 0.052 GPS Satellite UREs -- 10-17 June 2000 RMS User Range Error (meters) 2.5 PPS SIS URE -- GPS Orbit and Clock Errors SPS SIS URE -- Includes SF Bias, Error in Tgd Calibration 2 1.5 1 0.5 0 1 2 3 4 5 6 7 8 9 10 11 17 18 20 21 22 23 24 25 26 27 29 30 31 GPS Satellite Pseudo Random Noise (PRN) Code Figure A-2-5. GPS PPS and SPS SIS URE Performance -- 10-17 June 2000 A-2.4 GPS-UTC (USNO) Time Scale Difference Management An estimate of the offset between GPS time and UTC as defined by the USNO is provided in each satellite’s navigation message. The system operator interfaces on a daily basis with the USNO to obtain the USNO’s measurement of this offset. The daily estimates are inputted to the MCS where they are used to project forward a prediction of the offset over the period of each navigation upload. The system operator also uses the estimates for adjusting GPS time to ensure the offset relative to UTC (USNO) does not deviate beyond operational tolerances. Page A-12 October 2001 GPS SPS Performance Standard SECTION A-3 Service Availability Characteristics This section describes expected GPS service availability characteristics and provides the user with information concerning service availability patterns on a global average and worst site basis. Service availability varies slightly over time due to routine satellite maintenance requirements, constellation drift, and URE performance variations. Service availability is described in terms of how it varies due to several different factors: • Elevation mask angle • Type of navigation solution (four-satellite versus all-in-view) • All variations of one and two satellites removed from the current ops nominal 24-satellite constellation • Satellite orbit position variations relative to nominal slot assignments • Constellation RMS SPS SIS User Range Error The section ends with a description of “normal” SPS se...
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This document was uploaded on 09/26/2013.

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