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Line No. Table 30-II SEM Almanac Description for Current.al3 (Sheet 1 of 2) Almanac Name Description Units Range Accuracy Precision 1 Number of records Name of Almanac 2 GPS Week Number GPS Time of Applicability The number of satellite Almanac almanac records contained in the file Descriptive name for the Almanac in the file The aAlmanac reference week number (WNa) for all aAlmanac data in the file The number of seconds since the beginning of the aAlmanac reference week. The aAlmanac reference time (t oa ) for all aAlmanac data in the file Records 0 to 32 1 2 significant digits N/A Any combination of valid ASCII characters Weeks 0 to 1024 1023 * 3 Blank line for format spacing Record Format R-1 PRN Number The satellite PRN number. This is a required data item as it is the GPS user's primary means of identifying GPS satellites. It is equivalent to the space vehicle identification (SVID) number of the SV R-2 SVN The SV reference number. Unique sequential number associated with each satellite R-3 Average URA Number The satellite "average" URA** number. This is not an item in the raw aAlmanac file but is based on the average URA value transmitted by this satellite in subframe 1. The URA is taken in the range of 730 hours R-4 Eccentricity This defines the amount of the orbit deviation from a circular orbit (e)** N/A 24 significant characters 1 4 significant digits Second 0 to 602,112 1 6 significant digits None 1 to 32 None 2 significant digits None 0 to 255999 (zero denotes that this field is empty) None 3 significant digits None 0 to 15 1 2 significant digits Unitless 0 to 3.125 E-2 4.77 E-7 7 significant digits 30-5 ICD-GPS-870 23 June 201113 Aug 2010
Line No b c R-5 d e Table 30-IIIIITable 30-III SEM Almanac Description for Current.al3 (Sheet 2 of 2) Almanac Name Description Units Range Accuracy Precision Inclination Offset Satellite aAlmanac orbital "inclination angle offset" (δ i )** This does not include the 0.30 semicircle reference value (i 0 )** Rate of Right Ascension Square Root of Semi-Major Axis Geographic Longitude of Orbital Plane Argument of Perigee Rate of change in the measurement of the angle of right ascension (Ω-DOT)** Measurement from the center of the orbit to either the point of apogee or the point of perigee (A 1/2 )** Geographic longitude of the orbital plane at the weekly epoch" (Ω 0 )** The angle from the equator to perigee (ω)** R-6 Mean Anomaly The angle which describes the position of the satellite in its orbit, relative to perigee. (M 0 )** f g Zeroth Order Clock Correction First Order Clock Correction The satellite aAlmanac zeroth order clock correction term (a f0 )** The satellite aAlmanac first order clock correction term (a f1 )** R-7 Satellite Health The satellite subframe 4 and 5, page 25 six-bit health code ** R-8 Satellite Configuration The satellite subframe 4, page 25 four-bit configuration code ** Semi circles Semi circles/ second -6.25 E-2 to +6.25 E-2 -1.1921 E-7*** to +1.1921 E-7*** 1.91 E-6 7 significant digits 3.64 E-12 7 significant digits Meters 1/2 digits 0 to 8,192 4.88 E-04 9 significant Semi circles Semi circles Semi circle -1.0 to +1.0 1.19 E-07 9 significant digits -1.0 to +1.0 1.19 E-07 9 significant digits -1.0 to +1.0 1.19 E-07 9 significant digits Seconds -9.7657 E-4*** to +9.7657 E-4*** Seconds/ second R-9 Blank line for format spacing -3.7253 E-9*** to +3.7253 E-9*** 9.54 E-07 5 significant digits 3.64 E-12 5 significant digits None 0 to 63 None 2 significant digits None 0 to 15 None 2 significant digits *GPS Week Number as distributed by the CS is a modulo 1024 (0-1023) decimal number representing the modulo 1024 binary week number broadcast from an SV (see IS-GPS-200). Some user applications (such as the SEM program) may require the user to replace the modulo 1024 week number in this format with the full decimal week number (e.g., 0-65,535) in order to determine the correct calendar date of the aAlmanac.. **As defined in IS-GPS-200. ***Rounded up from max range of IS-GPS-200 binary format. 30-6 ICD-GPS-870 23 June 201113 Aug 2010
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Page 5 and 6: TABLE OF CONTENTS 1 SCOPE..........
Page 7 and 8: TABLE OF FIGURES Figure 1 GPS OCX t
Page 9 and 10: 1 SCOPE 1.1 Scope This Interface Co
Page 11 and 12: 2 APPLICABLE DOCUMENTS 2.1 Governme
Page 13 and 14: 3 REQUIREMENTS 3.1 Interface Identi
Page 15 and 16: interface function. The term “MCS
Page 17 and 18: The GPS OCX uploads the NANU, Opera
Page 19 and 20: ICC ICD ICWG ID IP IS JDAY LEAPSEC
Page 21 and 22: 7 APPROVAL The signatories have app
Page 23 and 24: Section # Requirement Title Verific
Page 25 and 26: NANU ACRONYM FCSTUUFN NAME Forecast
Page 27 and 28: NOTICE ADVISORY TO NAVSTAR USERS (N
Page 37 and 38: 10.410.3 NANU Message Format The NA
Page 39 and 40: 10.4.2.110.3.2.1 NANU Message Descr
Page 41 and 42: 10.4.2.310.3.2.3 Satellite Identifi
Page 43 and 44: 10.4.310.3.3 NANU Section Two2 As s
Page 45 and 46: Figure 20-1 Sample Operational Advi
Page 47 and 48: Figure 20-3 OA Section One1 20.4 OA
Page 49 and 50: 20-6 ICD-GPS-870 23 June 201113 Aug
Page 51 and 52: SV Health Category Six Bit SV Healt
Page 53: CURRENT.AL3 032 Figure 30-1 SEM Dat
Page 57 and 58: ******** Week 175 almanac for PRN-0
Page 59 and 60: Table 40-II identifies the characte
Page 61 and 62: 60 APPENDIX 46: LETTERS OF EXCEPTIO
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