From monitoring the integrity of the GPS constellation, to situational awareness
for theaters of operation, to the support of critical operations world-wide, JPL
has the unrivalled ability to assess the performance of the GPS navigation signals
JPL operates the only global ground network that is capable of inferring the
satellite state in real time globally, and to separate clock performance from
orbit performance. JPL's network tracks each GPS satellite with at least 10 tracking
stations simultaneously and, on average, with 25 tracking stations. The dense
tracking network also provides extraordinary level of redundancy and the opportunity
for strong majority voting schemes.
Our suite of monitoring tools provides customized alarm thresholds with as
little as 4 seconds time to alarm, graphical and binary user interfaces,
communications protocols, and around-the-clock operations for the most demanding
applications. The GDGPS staff of engineers can tailor a performance monitoring
application for your needs.
Access to some of the integrity monitoring information may require approval
by the Department of Defense.
Snapshot from the JPL GPS Integrity Monitor web page (restricted access), depicting links between the GPS satellites and the ground tracking sites.