Original file name
PRN of the SVN
000=usable
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).
The number of seconds in the orbit when the
almanac was generated. Kind of a time tag.
The angle to which the SV orbit meets the
equator (GPS is at approx. 55 degrees). Roughly, the SV's orbit
will not rise above approx. 55 degrees latitude. The number is
part of an equation: #= pi/180 = the true inclination.
Rate of change in the measurement of the angle
of right ascension as defined in the Right Ascension mnemonic.
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.
Geograpic Longitude of the Asending Node of the
Orbit Plane at the Weekly Epoch.
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.
Angle (arc) traveled past the longitude of
ascending node (value= 0-180 degrees or 0-negative 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.
SV clock bias in seconds
SV clock Drift in seconds per seconds
GPS week (0000-1024)