ID |
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PRN of the SVN |

Health |

000=usable |

Eccentricity |

This shows the amount of the orbit deviation from circular (orbit). It is the distance between the foci divided by the length of the semi-major axis (our orbits are very circular). |

Time of Applicability |

The number of seconds in the orbit when the almanac was generated. Kind of a time tag. |

Orbital Inclination |

The angle to which the SV orbit meets the equator (GPS is at approximately 55 degrees). Roughly, the SV's orbit will not rise above approximately 55 degrees latitude. The number is part of an equation: # = π/180 = the true inclination. |

Rate of Right Ascension |

Rate of change in the measurement of the angle of right ascension as defined in the Right Ascension mnemonic. |

SQRT(A) Square Root of Semi-Major Axis |

This is defined as the measurement from the center of the orbit to either the point of apogee or the point of perigee. |

Right Ascension at Time of Almanac (TOA) |

Right Ascension is an angular measurement from the vernal
equinox ((OMEGA)_{0}). |

Argument of Perigee |

An angular measurement along the orbital path measured from the ascending node to the point of perigee, measured in the direction of the SV's motion. |

Mean Anomaly |

Angle (arc) traveled past the longitude of ascending node (value = 0±180 degrees). If the value exceeds 180 degrees, subtract 360 degrees to find the mean anomaly. When the SV has passed perigee and heading towards apogee, the mean anomaly is positive. After the point of apogee, the mean anomaly value will be negative to the point of perigee. |

a_{f0} |

SV clock bias in seconds. |

a_{f1} |

SV clock drift in seconds per seconds. |

Week |

GPS week (0000–1023), every 7 days since 1999 August 22. |

GPS Yuma Almanacs | ||
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1990 1991 1992 1993 1994 1995 1996 1997 1998 1999 |
2000 2001 2002 2003 2004 2005 2006 2007 2008 2009 |
2010 2011 2012 2013 2014 2015 2016 2017 2018 2019 |

Latest | |
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Status Messages | NANUs |

SEM Almanacs | Yuma Almanacs |