Abstract. We present a novel reconstruction algorithm of ω-k type which suits for wideband circular synthetic aperture data taken in stripmap mode. The proposed algorithm allows to reconstruct an image on a cylindrical surface. The range trajectory is approximated by Taylor Series expansion using only the quadratic terms which limits the angular reconstruction range (cross range). In our case this is not a restriction for the application. Wider areas with respect to cross range can be realized by joining several reconstructed images side by side to build a wider image by means of digital spotlighting.
The exposure setup presented is intended for a controlled, long-term and continuous exposition (20 Months, 24 h/day) of a large number of animals (100 rats at minimum) with standard GSM and UMTS signals, at 900 MHz and 1966 MHz, respectively. To obtain a homogeneous field within a large volume, the setup is based on the 'compact range' principle well known from antenna measurement facilities to produce a plane wave at relatively short ranges from the reflector. All requirements imposed due to the in vivo nature of the experiment, i.e. air-conditioning and easy access to the cages can be fulfilled.
Basic experiments and results concerning MMW imaging of human beings with emphasis on people screening in safety crucial environments are discussed. Common network analysis equip ment and several mechanical positioning systems are intended to be used to obtain significant pixel images of the human's body and other concealed objects. Especially lens focused pixel images are presented.
Nowadays a lot of different services are brought to the user using wireless infrastructure. To enhance these services an information about the users actual position is often desirable. To obtain this information additional sensors have to be installed. As Doppler processing can easily be integrated in already existing indoor infrastructure, position finding systems based on Doppler measurements would be preferable.This paper presents a position finding system that relies on the simultaneous Doppler measurement of an object by four sensors at different positions. The four Doppler signals are evaluated to obtain position and velocity of a single moving target by iteratively solving a nonlinear system of equations. Methods to assess the obtainable accuracy as well as first simulation results will be discussed. A 4-channel CW-radar as a demonstration system is presented.
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