Accurate Radar Measurements of Drag Coefficients in Free Flight

Best Practices for Making the Most Accurate Radar Pulse Measurements

RF and microwave power measurement is critical at every stage of the radar system lifecycle, helping to ensure the basic performance of the system is met. Today’s test engineers are challenged to deliver comprehensive test results within the tightest schedule. Moreover, test coverage is not allowed to be compromised with the reduction in scheduled test time. These factors now force engineers to...

determination of maximal singularity free zones in the workspace of parallel manipulator

due to the limiting workspace of parallel manipulator and regarding to finding the trajectory planning of singularity free at workspace is difficult, so finding a best solution that can develop a technique to determine the singularity-free zones in the workspace of parallel manipulators is highly important. in this thesis a simple and new technique are presented to determine the maximal singula...

Modeling Satellite Drag Coefficients With Response Surfaces

Accurate time interval measurement electronics for pulsed time of flight laser radar

A time-to-digital converter for pulsed time-offlight laser radar devices has been developed and six units have been constructed and tested thoroughly. The time interval between the start and stop pulses is digitized coarsely by counting the 100 MHz clock oscillator pulses. The +/-10 ns uncertainty is improved to +/-10 ps by means of an analogue interpolation method based on the discharge of a k...

The Drag-Free Satellite

A scientific earth satellite that is guided in a drag-free orbit by a shielded, free-falling proof mass has been proposed by a number of investigators. This paper examines the feasibility and some of the applications of this scheme. The control and guidance system is analyzed with respect to system performance and gas usage requirements. The principal trajectory errors that are due to vehicle g...