Which a healthy gps satellites ranging signal exceeds

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Unformatted text preview: Statistic: • A satellite SPS SIS URE statistic is defined to be the Root Mean Square (RMS) difference between SPS ranging signal measurements (neglecting user clock bias and errors due to propagation environment and receiver), and “true” ranges between the satellite and an SPS user at any point within the service volume over a specified time interval. • A constellation SPS SIS URE statistic is defined to be the average of all satellite SPS SIS URE statistics over a specified time interval. Page B-3 October 2001 GPS SPS Performance Standard Steady-State Behavior: Behavior within statistical expectations. Time Transfer Accuracy Relative to UTC (USNO): The difference at a 95% probability between user UTC time estimates and UTC (USNO) at any point within the service volume over any 24hour interval. Transient Behavior: Short-term behavior not consistent with steady-state expectations. Usable SPS Ranging Signal: An SPS ranging signal that can be received, processed, and used in a position solution by a receiver with representative SPS receiver capabilities. User Navigation Error (UNE): Given a sufficiently stationary and ergodic satellite constellation ranging error behavior over a minimum sample interval, multiplication of the DOP and a constellation ranging error standard deviation value will yield an approximation of the RMS position error. This RMS approximation is known as the UNE (UHNE for horizontal, UVNE for vertical, and so on). The user is cautioned that any divergence away from the stationary and ergodic assumptions will cause the UNE to diverge from a RMS value based on actual measurements. User Range Accuracy (URA): A conservative representation of each satellite’s expected (1σ) SIS URE performance (excluding residual group delay) based on historical data. A URA value is provided that is representative over the curve fit interval of the navigation data from which the URA is read. The URA is a coarse representation of the URE statistic in that it is quantized to the levels represented in ICD-GPS-200C. Page B-4 October 2001 GPS SPS Performance Standard SECTION B-2 Acronyms BIPM bps BPSK International Bureau of Weights and Measures bits per second Bipolar-Phase Shift Key C/A C/No CS Coarse/Acquisition Signal-to-Noise Ratio Control Segment dBi dBW DoD DOP DOT Decibels, isotropic Decibels, watt Department of Defense Dilution of Precision Department of Transportation ECEF ERD Earth-Centered, Earth-Fixed Estimated Range Deviation FAA FOC FRP Federal Aviation Administration Full Operational Capability Federal Radionavigation Plan GEC GPS GLAN GA Groundtrack Equatorial Crossing Global Positioning System Geographic Longitude of the Ascending Node Ground Antenna HDOP HMI HOW HUNE Horizontal Dilution of Precision Hazardously Misleading Information Hand-Over Word Horizontal Component of the User Navigation Error ICD ID IGEB IOC IODC IODE ION Interface Control Document Identification Interagency GPS Executive Board Initial Operational Capabili...
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This document was uploaded on 09/26/2013.

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