Global Positioning Systems (GPS) are satellite-based navigation systems that utilize a network of earth orbiting satellites. GPS operates well under any weather condition and does not require a subscription fee. GPS is a crucial component of precision agriculture by providing precise location information with very high repeatability. In recent years, GPS have improved in their level of performa...

In this paper, an approach is proposed for relative state estimation for satellites in formation flying. To estimate the relative states of two satellites, the Kalman Filter algorithms (EKF, UKF) are adopted with the relative range and range rate between two satellites and attitude of a satellite as measurement variables. In case that the initial state and measurements errors are moderate, both...

In this paper, transverse and longitudinal vibration of nonlinear plate under exciting of orbiting mass is considered based on first-order shear deformation theory. The nonlinear governing equation of motion are discretized by the finite element method in combination with Newmark’s time integration scheme under von Karman strain-displacement assumptions. For validation of method and formulation...

A de-orbiting strategy for small satellites, in particular CubeSats, is proposed which exploits the effect of solar radiation pressure to increase the spacecraft orbit eccentricity so that the perigee falls below an altitude where atmospheric drag will cause the spacecraft orbit to naturally decay. This is achieved by fitting the spacecraft with an inflatable reflective balloon. Once this is fu...

1. INTRODUCTION Late this decade, the National Polar-orbiting Operational Environmental Satellite System (NPOESS) Integrated Program Office (IPO) will initiate a new generation of passive electro-optical multispectral imagers and hyperspectral sounders to operate in three complementary orbit planes. NPOESS will replace the now-venerable civil Polar-orbiting Operational Environmental Satellite (...

With the help of various polar-orbiting environment observing platforms, atmospheric concentration carbon dioxide (CO2) has been well established on a global scale. However, spatial and temporal pattern CO2 emission its flux dependence daily human activity processes are not yet understood. One limiting factors could be attributed to low revisit time frequency polar orbiting satellites. high rev...

For much of their existence, the environmental benefits artificial satellites, particularly through provision remotely sensed data, seem likely to have greatly exceeded costs. With dramatic current and projected growth in number Earth-observation other satellites low Earth orbit, this trade-off now needs be considered more carefully. Here we highlight range impacts satellite technology, taking ...

The capture and recovery of an expensive satellite that has lost its attitude control function can be an important class of future missions for space robots. Moreover, there are tens of thousands of pieces of debris in orbit from previous missions. These orbiting debris such as the uncontrolled pieces of booster stages and obsolete satellites are a serious hazard to future orbiting spacecrafts....

Low-Earth orbiting (LEO) satellites now can provide broadband service anywhere in the world, but they must share radio spectrum with geosynchronous Earth-orbiting (GEO) satellites. The United Nations International Telecommunications Union (ITU) and U.S. Federal Communications Commission (FCC) require that operators of LEO satellite systems avoid interfering GEO even though both use same bands w...