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Methods for improving the detection of concealed electronics, such as those used in improvised explosive devices (IEDs), are of continuing interest. In this regard, the harmonic radar, which utilises the non-linear junction (NLJ) effect, offers the potential of useful stand-off ranges with a high probability of detection and low false alarm rate. This paper explains the principles of harmonic radar...
This paper describes practical constraints on the use of MIMO radars imposed by the need for separable codes on each transmitter waveform, and where long code repetition intervals can degrade performance. This is especially problematic for long range radars with many transmitter elements which require long code repetition intervals. This causes beamforming problems if the scene is not phase stationary...
We describe the relationship between far field pattern synthesis for the co-array and the SAR array; showing the application of these to MIMO radar pattern synthesis. Whereas the original co-array concept was developed for planar arrays, the understanding as described in this paper shows its generalisation to arbitrary three dimensional arrays. These ideas are then used to show some useful MIMO radar...
We address the problem of estimating the surface profile of the ground from an airborne platform with a forward looking MIMO radar. In particular we are interested in developing a landing aid for helicopters in degraded visibility. In this paper we present an algorithm for fitting a plane surface to the data obtained from a coherent co-located MIMO radar. This algorithm is based on the common tangent...
A small company in Brisbane working on MIMO radar systems was acquired by Teledyne Inc in Sept 2009. Continued support has allowed the development of several concept demonstrators where MIMO offers a distinct advantage. We describe two of these: a stand-off body scanner, capable of imaging and screening people whilst walking; and a Multi-Beam Radar Altimeter which captures the topography of the ground...
An algorithm for super resolution and sidelobe suppression is described for coherent collocated MIMO imaging radar. The algorithm modifies the coherent CLEAN method by performing a nonlinear least squares (NLLS) optimization in the beam domain. The NLLS optimization is performed at each step of the CLEAN algorithm, accounting for the mutual interference terms of closely spaced targets. This removes...
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