Satellite to Satellite Visibility

Real-Time GPS Landslide Monitoring Under Poor Satellite Visibility

Among the available technologies such as cables and lasers, the Global Positioning System (GPS) is being increasingly used for automated continuous monitoring of landslides and avalanches. The timely identification of precursory movements of landslides could save lives and minimise collateral damage. Carrier-phase observations from four or more GPS satellites allow relative displacements to be ...

Determination of the Geopotential from Satellite - to - Satellite Tracking Data

the basic National horizontal and vertical networks of geodetic control and provides governmentwide leadership in the improvement of geodetic surveying methods and instrumentation, coordinates operations to assure network development, and provides specifications and criteria for survey operations by Federal, State, and other agencies. NGS engages in research and development for the improvement ...

New NASA satellite - to - satellite communications take shape

Satellite to Satellite Tracking in the Space-wise Approach

The launch of the champ mission in 2000 has renewed interest in the recovery of the geopotential field from satellite observations which has been a challenging research issue for decades. It was the first dedicated gravity field mission which was followed by the grace spacecrafts. In the grace mission, the high-low (hl-) and the low-low satellite-to-satellitetracking (ll-sst) observations are c...

Inter-Satellite Communications for Small Satellite Systems

Small satellite technology has opened a new era in aerospace engineering by decreasing space mission costs, without greatly reducing the performance. The concept of formation flying using small satellites is becoming popular because of their potential to perform coordinated measurements of remote sensing space missions. The current state of art in satellite communications is a one hop link betw...