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NASA has defined a metric to determine the necessary launch capacity for an advanced life-support system (ALS), designed to support humans for an extended duration beyond low earth orbit. This metric allows the comparison of techniques and technologies over time and between mission scenarios, yielding the optimum physical-chemical and bioregenerative array(More)
This paper presents a review of the most important features of the Shorted Annular Patch antennas. These radiators have several mechanical and electrical advantages with respect to other microstrip geometries. In particular, the presence of the short in the central zone of the antenna provides increased radiation flexibility which permits to control the(More)
The present work is focused on <i>Software Defined Radar - (SDR)</i> paradigm, which gives a more versatile solution when compared to classical radar systems. Thanks to this new system model, most of the fundamental operations, such as signal generation, filtering, up and down conversion, are easily implemented via software. The objective of this paper is(More)
—A novel hybrid procedure is proposed in this paper for far-field reconstruction from phaseless near-field data. A basically interferometric approach is adopted to retrieve the near-field phase from amplitude-only measurements, which are collected by a simple microstrip circuit used in conjunction with two identical probes moving on the scanning surface. A(More)
A high resolution Software Defined Radar system is implemented in this work by adopting the new generation Universal Software Radio Peripheral USRP NI2920, a software defined transceiver. The enhanced available bandwidth due to the Gigabit Ethernet interface is exploited to achieve the high range resolution features. At this purpose, a specific Labview(More)
In the past years, ESA has been considering the use of the () Global Positioning System GPS as a medium-accuracy attitude sensor for low-earth-orbit missions. This paper describes the design of a compact GPS antenna with impro¨ed multipath rejection to counteract the effects of the spurious reflections. In particular, a shorted annular patch that is a(More)
—Software Defined Radar is the latest trend in radar development. To handle enhanced radar signal processing techniques, advanced radars need to be able of generating various types of waveforms, such as frequency modulated or phase coded, and to perform multiple functions. The adoption of a Software Defined Radio system makes easier all these abilities. In(More)