ABSTRACT: This paper describes the design for an experimental short-range (2 Km) high-resolution (30Ã30 cm<sup>2</sup>) Synthetic Aperture Radar (SAR) sensor in the millimetre wave band to take it onboard Unmanned Aerial Vehicles (UAV). The novelty lies on the establishment of new and very demanding requirements induced by the need of being onboard low cost aerial platforms and so, susceptible of been employed in numerous military and civil applications, providing the basic advantage of these sensors against electro-optics: the possibility of using them at any time (night and day) and practically under any meteorological condition.
Electronics, Circuits and Systems, 2007. ICECS 2007. 14th IEEE International Conference on; 01/2008
ABSTRACT: This paper presents a new technique able to detect extended targets (small ones and big ones) (Ostrovityanov and Basalov, 1985), under very low signal to noise ratios (SNR) and signal to clutter ratios (SCR) with a high probability of detection and a low probability of false alarm. The method is based on the calculation of some modified statistical descriptors (Gonzalez and Woods, 2002), and the peak plots (Rihaczek and Hershkowitz, 2000) from raw sensor image. The peak plots are extracted by means of the shift-and-convolution technique (Perez Martinez et al., 2001). Experimental results are also presented demonstrating the quality of this technique. Experimental results have been obtained with ARIES radar (Perez et al., 2002), a surface marine and coast surveillance LFM-CW high resolution radar (HRR) (Wehner, 1995) developed by INDRA SISTEMAS S.A. in collaboration with the Technical University of Madrid. The Spanish Ministry of Defence has founded this research.
Security Technology, 2005. CCST '05. 39th Annual 2005 International Carnahan Conference on; 11/2005
ABSTRACT: In this paper it is shown a new technique able to obtain images with high-resolution radar (HRR) only using noncoherent data it extracts. This method doesn't need the data phase information of the signal reflected by targets, it works on "real time", and it is compatible with the scanning and tracking radar functions. The technique consists on a modification and adaptation of algorithms used for the synchronization of the actual digital communication systems. Likewise it is shown experimental results that ratify the quality of this technique. These results have been obtained with ARIES radar, a surface marine surveillance HHR developed by INDRA SISTEMAS S.A. in collaboration with the Polytechnic University of Madrid, by means of Spanish Ministry of Defence.
Sensors, 2003. Proceedings of IEEE; 11/2003
ABSTRACT: In this article, the experimental results are presented of applying a new non coherent and non statistic technique that allows us to endow the coastal surveillance high resolution radars (HRR) with a significant capacity for target classification and identification; making possible the estimation of their size, and also obtaining information about their structure by analyzing the intensity and position of their hot spots. The HRR used to obtain the experimental results is the ARIES, a surface marine radar able to transmit signals of almost 500 MHz of instantaneous bandwidth.
Radar Conference, 2003. Proceedings of the International; 10/2003
ABSTRACT: Intrusion detection systems based on the utilisation of continuous
wave (CW) radar and Doppler effect have several advantages over
electrooptic sensors, namely, their ability to work in dark or smoky
spaces, and under adverse weather conditions. However, they pose some
practical problems such as: their inability to provide any range
measure, nor to distinguish between different targets; high sensitivity
to unexpected motion which leads to the need of precise delimitation of
the area under surveillance, making its use difficult in certain
applications; remarkable vulnerability to electronic countermeasures and
high sensitivity to interference from other sensors. The advances in
microwave and signal processing technologies permit the affordable use
of spread-spectrum techniques, and particularly, the development of
sensors based on frequency modulated continuous wave radar, which is the
goal of this paper. These new sensors overcome the above mentioned
limitations: since its operation no longer lies on the Doppler effect,
they are insensitive to unexpected motion; as they are able to determine
ranges and therefore separate different targets, they can illuminate a
broader area than the one under vigilance, thus simplifying their
installation. In addition, they provide the number of targets in the
area of interest; due to the use of spread-spectrum signals, they offer
higher robustness against interference, either deliberate or generated
by other sensors. A prototype of this kind of sensors, operating at 22
GHz, is presented
Security Technology, 1999. Proceedings. IEEE 33rd Annual 1999 International Carnahan Conference on; 02/1999