There are many advantages to implementing satellite ground station TT&C functions using digital LSI and VLSI technology: increased reliability, reduced size, weight and power and enhanced performance. The functions of a satellite ground control station that could be digitized in the future are identified. The evolving capabilities in digital chip technology are reviewed to indicate how they wou...

Crop depends on its canopy to intercept solar radiation to drive both assimilation and water, nutrient absorption for its growth. Field experiments, involving three sowing time and three sowing rate, were conducted at Luancheng Station to investigate the effects of canopy size and development on crop growth and radiation use efficiency (RUE) of winter wheat during 2009/2010 and 2010/2011 gr...

the main purpose in this paper, to express strong algorithmic optimization in their ability to detect expression target of sar that use in aircraft, plane and satellites to observe the target on the ground. for this purpose,the sar technology and its applications are introduced. previous algorithms used in this field with poor diagnosis and appropriate speed is low, like means and fuzzy and pso...

* Journal Paper No. J-1578 of the Iowa Agricultural Experiment Station. Project No. 746. 1 Ajl, S. J., White, A. G. C., and Werkman, C. H., J. Bact., 54, 23 (1947). 2 Kalnitsky, G., Utter, M. F., and Werkman, C. H., Ibid., 49, 595-602 (1947). 3 Ochoa, S., J. Biol. Chem., 155, 87-100 (1944). 4 Quastel, J. H., and Wooldridge, W. R., Biochem. J., 22, 689-702 (1922). 5 Klotz, I. M., and Tietze, F.,...

In this article we present the development of a UAV ground control station simulator. We propose a module based description of the architecture of this simulator. We present the nonlinear model (six degree-of-freedom) of a fixed wing aircraft. And finally we present automatic control for a flight path. The control system is multi-layered. For fixedwing UAVs, it consists of a flight-path control...

The Local Area Augmentation System (LAAS) is a ground-based differential GNSS system designed to provide precision approach for aircraft landing at a LAASequipped airport. While most anomalies affecting the system can be mitigated in the range domain, positiondomain geometry screening is essential to mitigate threats from anomalous ionosphere spatial gradients. These can potentially cause large...

The Center for Orbit Determination in Europe (CODE) is contributing to the most recent reprocessing effort of International GNSS Service (IGS) with a triple-system solution including GPS (since 1994), GLONASS 2002) and Galileo 2013). Several model improvements respect operational processing scheme have been implemented applied effort: first group related update IERS-related models (mean pole hi...