Alain Gaugue

Ultra-Wideband Indoor Channel Modelling Using Ray-Tracing Software for through-the-Wall Imaging Radar

This paper presents a new software for design of through-the-wall imaging radars. The first part describes the evolution of a ray tracing simulator, originally designed for propagation of narrowband signals, and then for ultra-wideband signals. This simulator allows to obtain temporal channel response to a wide-band emitter (3 GHz to 10 GHz). An experimental method is also described to identify the propagation paths. Simulation results are compared to propagation experiments under the same conditions. Different configurations are tested and then discussed. Finally, a configuration of through-the-wall imaging radar is proposed, with different antennas patterns and different targets. Simulated images will be helpful for understanding the experiment obtained images.

UWB Radar: Mechanical Scanning and Signal Processing for Through-the-Wall Imaging

This chapter presents a state of the art of the UWB (ultra-wideband) radar for through-the-wall imaging, followed by a description of different methods to scan a scene situated through a wall using a UWB system. Principal attention of this chapter focuses on a mechanical scanning radar system and associated image processing to detect a human body through a wall and also the environment of a target.

A new high speed, high bandwidth acquisition platform for impulse UWB see through-the-wall radar

This paper presents the architecture of an acquisition platform designed for an impulse ultra wideband see through-the-wall Radar in the 3-6 GHz band. The platform is based on a fast analog to digital converter, a high bandwidth track and holds component and FPGA based electronics. On the basis of an acquisition at 1.25 GHz, an equivalent-time sampling frequency of 100 GHz is achieved with a refresh time of 2 ms.

UWB pulse radar for micro-motion detection

This paper presents a micro-motion detection based on coherent ultra-wide band pulse radar, in the context of improving the general imaging pipeline of through-the-wall radar. The proposed micro-motion detection principle is based on the measurement of the phase difference of the UWB carrier waveform between the transmitted and the received pulse signal. An experimental proof of concept of the proposed micro-motion capabilities is reported in this paper, with the detection of a 5mm woofer periodical micro-displacement, representing a displacement magnitude of λ/10. A radar architecture is designed to implement the imaging pipeline in real time, with this micro-motion feature. It performs 100GHz sampling frequency with an equivalent time sampling. The acquisition refreshing period of 2ms covers all biological micro-movement speed ranges.

UWB Short-Pulse Radar: Combining Trilateration and Back Projection for Through-the-Wall Radar Imaging

In this chapter, we propose a novel way to combine back projection and trilateration algorithms for through-the-wall imaging using an ultra-wideband (UWB) short-pulse radar system. The combination of the two algorithms increases the detection-localization performance. To accomplish this improvement, the multi-target localization problem of trilateration is addressed by the calculation of the root-mean-square error with regard to the estimated position and those of all possible target positions. The radar system’s entire processing pipeline is described, with a focus on the imaging block. The data were acquired using a multistatic radar system with a 3.2 GHz bandwidth. Simulations and experiments indicate that our combined method outperforms other methods. Simulation and experimental results are shown, compared, and discussed.