#
Figures and Statistics for Broadcast Orbits wrt IGS Rapid Orbits

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Orbit and clock comparison figures

The WRMS plots below show the Weighted RMS (m) of the Broadcast orbits
(brd) with respect to the IGS Rapid product.
The Clock Std Dev and Clock RMS plots show the standard deviations (ns)
and RMS (ns) of the Broadcast clocks with respect to the IGS Rapid
product. The Std Dev values are computed by removing a separate bias
for each satellite clock, whereas this is not done for the clock RMS
values. For Broadcast orbits and clocks, normally the RMS statistic is
more suitable. Note that the intentional degradation of the GPS clock
signals by Selective Availability (SA) was discontinued at midnight EDT
on 01 May 2000, GPS Week 1060, Day 1 (or 04:00 UTC on 02 May). Since
that change, civilian GPS users can obtain positioning and timing
determinations that are more accurate than before by about a factor of
up to ten. Clock statistics before Week 1060 are not shown here.

WRMS of Broadcast orbits |
recent weeks |
GIF |
PS |
history |
GIF |
PS |

Std Dev of Broadcast clocks |
recent weeks |
GIF |
PS |
history |
GIF |
PS |

RMS of Broadcast clocks |
recent weeks |
GIF |
PS |
history |
GIF |
PS |

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Orbit transformation results

The next plots show the weekly averages of the Helmert translation, rotation,
and scale parameters of the Broadcast orbits with respect to the IGS Rapid
products.

01 January 2012, originator IGS ACC