… The GPS signal beamwidths extend roughly 3000 km … that GPS so ably provides. Real time
techniques fall under what we shall call direct GPS orbit determination, in which only the GPS …

… on GPS signal propagation. First, the so-called bending effect arises due to the signal not …
Second, the dispersive nature of the ionosphere means that GPS L1 and L2 signals travel …

… orbit determination with data from 1985 GPS field experiments. The most successful strategy
uses multiday arcs for orbit determination … The GPS satellites transmit carrier signals at two L…

… Considering the absence of Selective Availability in all present and future radio navigation
signals, the use of undifferenced GPS measurements in combination with known …

… The 12-channel GOCE Lagrange GPS receiver will get its signals … signals for rising satellites
is another important aspect. The elevation cut off angle is different for rising and setting GPS …

… , real-time, autonomous orbit determination software that could realistically be implemented
… Figure 1 shows a diagram of the occultation of a GPS signal by the earth’s atmosphere. The …

… GPS satellites [1]. This paper explores further the expected improvement in the GEO orbit
determination … As the transponder-type GEO‘s ranging signal is generated at the GUS [4], the …

… It was realised by the Department of Defense that uncontrolled access to the GPS signals
may compromise national security. To alleviate this, it has been proposed to degrade the …

… module utilizes the spare CPU capacity that remains after the core GPS signal acquisition
and tracking function, observation data collection task, snapshot navigation solution …

… vector rGPS of the observed GPS satellite at epoch ti - 7, where r is the signal travel time, the
… ti and ti+l for one GPS satellite reads as (signal travel time corrections omitted for simplicity): …