Precise Positioning Service Performance Standard - GPS.gov

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February 2007 GPS PPS PS Table 3.4-1. PPS SIS URE Accuracy Standards SIS Accuracy Standard Dual-Frequency P(Y)-Code: • ≤ 5.9 m 95% Global Average URE during Normal Operations over all AODs Conditions and Constraints • For any satellite marked as healthy in the NAV message • ≤ 2.6 m 95% Global Average URE during Normal Operations at Zero AOD • ≤ 11.8 m 95% Global Average URE during Normal Operations at Any AOD Single-Frequency P(Y)-Code: • ≤ 6.3 m 95% Global Average URE during Normal Operations over all AODs • ≤ 5.4 m 95% Global Average URE during Normal Operations at Zero AOD • For any satellite marked as healthy in the NAV message • Neglecting single-frequency ionospheric delay model errors • Including group delay time correction (T GD ) errors at L1 • ≤ 12.6 m 95% Global Average URE during Normal Operations at Any AOD Dual-Frequency P(Y)-Code with WAGE: • ≤ 4.4 m 95% Global Average URE during Normal Operations over all WAGE AODs Single-Frequency P(Y)-Code with WAGE: • ≤ 6.2 m 95% Global Average URE during Normal Operations over all WAGE AODs Dual- or Single-Frequency P(Y)-Code regardless of WAGE: • For any satellite marked as healthy in the NAV message • For any satellite marked as healthy in the NAV message • Neglecting single-frequency ionospheric delay model errors • Including group delay time correction (T GD ) errors at L1 • For any satellite marked as healthy in the NAV message • ≤ 388 m 95% Global Average URE during Extended Operations after 14 Days without Upload Notes: 1. For dual-frequency P(Y)-code URE, the ≤ 11.8 m 95% at any AOD performance standard is equivalent to the ≤ 5.9 m 95% over all AODs performance standard. 2. For single-frequency P(Y)-code URE, see Appendix A for information on how to factor in the singlefrequency ionospheric delay model errors for L1 or for L2. 3. For single-frequency P(Y)-code URE at L2, see Appendix A for information on how to factor in the group delay time correction (T GD ) errors at L2. 1 st Edition Page 22
February 2007 GPS PPS PS 4. The “over all AODs” performance standards are the ones which are the most directly representative of the URE experienced by PPS receivers. See Appendix A for further information. 3.4.2 PPS SIS URRE Accuracy Standards The PPS SIS URRE accuracy shall be as specified in Table 3.4-2. Table 3.4-2. PPS SIS URRE Accuracy Standards SIS Accuracy Standard Dual- or Single-Frequency P(Y)-Code: • ≤ 0.006 m/sec 95% Global Average URRE over any 3-second interval during Normal Operations at Any AOD Conditions and Constraints • For any satellite marked as healthy in the NAV message • Neglecting all perceived pseudorange rate errors attributable to pseudorange step changes caused by NAV message data cutovers (including NMCT cutovers) • Neglecting any single-frequency ionospheric delay model errors Notes: 1. The normal operations performance standards are consistent with a Block II/IIA clock stability of 1x10 -11 at a tau of 3 seconds for either Rubidium clocks or Cesium clocks. However, more recent GPS Blocks exhibit significantly improved clock stability. Therefore this PPS PS is based upon a very conservative clock stability assumption. 2. Root-sum-squaring the SIS-caused URRE with the receiver-caused pseudorange rate error, and neglecting any correlated components, the combined pseudorange rate error perceived by the GPS receiver is known as the User Equivalent Range Rate Error (UERRE). 3. WAGE has no impact on the PPS SIS URRE accuracy standard. 3.4.3 PPS SIS URRRE Accuracy Standards The PPS SIS URRRE accuracy shall be as specified in Table 3.4-3. Table 3.4-3. PPS SIS URRRE Accuracy Standards SIS Accuracy Standard Dual- or Single-Frequency P(Y)-Code: • ≤ 0.002 m/sec/sec 95% Global Average URRRE over any 3-second interval during Normal Operations at Any AOD Conditions and Constraints • For any satellite marked as healthy in the NAV message • Neglecting all perceived pseudorange acceleration errors attributable to pseudorange step changes caused by NAV message data cutovers (including NMCT cutovers) • Neglecting any single-frequency ionospheric delay model errors 1 st Edition Page 23
Page 1 and 2: GLOBAL POSITIONING SYSTEM PRECISE P
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Precise Positioning Service Performance Standard - GPS.gov

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