Number of Records |

The number of satellite almanac records contained in the file |

Units: Records
Range: 0 to 32
Accuracy: 1
Precision: 2 significant digits
Frequency: Once per file
Type: Integer |

Title |

A short description of the file |

Units: None
Range: Any combination of valid ASCII characters
Accuracy: None
Precision: 24 significant characters
Frequency: Once per file
Legality Checks: Valid ASCII characters
Type: ASCII string |

GPS Week Number |

The almanac reference week (VINA) for all almanacs in the
file per IS-GPS-200H |

Units: Weeks
Range: 0 to 1023
Accuracy: 1
Precision: 4 significant digits
Frequency: Once per file
Legality Checks: Range check
Type: Integer |

GPS Time of Applicability |

The almanac reference time (TOA) for all almanacs in the
file per IS-GPS-200H |

Units: Seconds
Range: 0 to 602112
Accuracy: 1
Precision: 6 significant digits
Frequency: Once per file
Legality Checks: Range check
Type: Long integer |

PRN Number |

The satellite PRN number per ICD-GPS-200H. 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
satellite. |

Units: None
Range: 1 to 32
Accuracy: None
Precision: 2 significant digits
Frequency: Number of records per file
Legality check: Range check
Type: Integer |

SVN Number |

The satellite "SVN" reference number. This is not a
required data item and is normally included only for cross-reference with the
operational control system (OCS). |

Units: None
Range: 0 to 255
Accuracy: None
Precision: 3 significant digits
Frequency: Number of records per file
Legality check: Range check
Type: Integer |

Average URA Number |

The satellite "average" URA number, with URA number as
defined in IS-GPS-200H. This is not an
item in the raw almanac file but is based on the average URA value transmitted
by this satellite in its subframe 1 data sets. |

Units: None
Range: 0 to 15
Accuracy: 1
Precision: 2 significant digits
Frequency: Number of records per file
Legality check: Range check
Type: Integer |

Eccentricity |

The satellite almanac orbital "eccentricity" (e) as defined
in IS-GPS-200H. |

Units: Unitless
Range: 0.0 to 0.03
Accuracy: 4.7E-7
Precision: 7 significant digits
Frequency: Number of records per file
Legality check: Range check
Type: Real |

Inclination Offset |

The satellite almanac orbital "inclination angle offset"
(i) as defined in IS-GPS-200H. This is an
item in the raw almanac file and does not include the 0.30 semicircle
reference value. This should not be confused with the "i_{0}" term in
the satellite ephemeris files. |

Units: Semicircles
Range: -9.999999E-2 to +9.999999E-2
Accuracy: 1.91E-6
Precision: 7 significant digits
Frequency: Number of records per file
Legality check: Range check
Type: Real |

Rate of Right Ascension |

The satellite almanac orbital "rate of right ascension"
(OMEGADOT) as defined in IS-GPS-200H. |

Units: Semicircles/second
Range: -9.999999E-7 to +9.999999E-7
Accuracy: 3.6E-12
Precision: 7 significant digits
Frequency: Number of records per file
Legality check: Range check
Type: Real |

Square Root of Semi-Major Axis |

The satellite almanac orbital "square root of the semi-major
axis" (A)^{1/2} as defined in IS-GPS-200H. |

Units: Meters^{1/2}
Range: 79.0 to 9999.99999
Accuracy: 4.8E-4
Precision: 9 significant digits
Frequency: Number of records per file
Legality check: Range check
Type: Real |

Longitude of Orbital Plane |

The satellite almanac orbital "geographic longitude of the
orbital plane at the weekly epoch" (OMEGA)_{0} as defined in
IS-GPS-200H. |

Units: Semicircles
Range: -1.0 to +1.0
Accuracy: 1.1E-7
Precision: 9 significant digits
Frequency: Number of records per file
Legality check: Range check
Type: Real |

Argument of Perigee |

The satellite almanac orbital "argument of perigee"
(ω) as defined in IS-GPS-200H. |

Units: Semicircles
Range: -1.0 to +1.0
Accuracy: 1.1E-7
Precision: 9 significant digits
Frequency: Number of records per file
Legality check: Range check
Type: Real |

Mean Anomaly |

The satellite almanac orbital "mean anomaly"
(M_{0}) as defined in IS-GPS-200H. |

Units: Semicircles
Range: -1.0 to +1.0
Accuracy: 1.1E-7
Precision: 9 significant digits
Frequency: Number of records per file
Legality check: Range check
Type: Real |

Zeroth-Order Clock Correction |

The satellite almanac zeroth-order clock correction term
(a_{f0}) as defined in IS-GPS-200H. |

Units: Seconds
Range: -9.9999E-4 to +9.9999E-4
Accuracy: 9.5E-7
Precision: 5 significant digits
Frequency: Number of records per file
Legality check: Range check
Type: Real |

First-Order Clock Correction |

The satellite almanac first-order clock correction term
(a_{f1}) as defined in IS-GPS-200H. |

Units: Seconds/second
Range: -9.9999E-9 to +9.9999E-9
Accuracy: 3.6E-12
Precision: 5 significant digits
Frequency: Number of records per file
Legality check: Range check
Type: Real |

Satellite Health |

The satellite subframe 4 and 5, page 25 six-bit health code
as defined in IS-GPS-200H expressed in
integer form. |

Units: None
Range: 0 to 63
Accuracy: None
Precision: 2 significant digits
Frequency: Number of records per file
Legality check: Range check
Type: Integer |

Satellite Configuration |

The satellite subframe 4, page 25 four-bit configuration
code as defined in IS-GPS-200H expressed
in integer form. |

Units: None
Range: 0 to 15
Accuracy: None
Precision: 2 significant digits
Frequency: Number of records per file
Legality check: Range check
Type: Integer |