Summary
International Symposium on Antennas and Propagation
2010
Session Number:4FB2
Session:
Number:4FB2-3
An Experimental Study on an Accurate UWB Radar Imaging Method for a Target with Unknown Motion using a Small Number of Antennas
Yuji Matsuki, Takuya Sakamoto, Toru Sato,
pp.-
Publication Date:2010/11/23
Online ISSN:2188-5079
Summary:
Developing a cost-effective security system has been an important issue in crime prevention. Although cameras have been known as an effective candidate for this purpose, they have some limitations, such as difficulty in accurately estimating the three-dimensional shape of a target, and the exact distance to a target [1], [2]. Ultra-wideband (UWB) pulse radar is an alternative for resolving these problems of camera-based conventional systems. Although UWB radar imaging methods such as SAR (synthetic aperture radar) or other migration methods estimate target shape using simple and stable processes, the methods are not suitable for surveillance systems because the accuracy of the shape estimation is of a wavelength order, and estimation is time-consuming [3], [4]. SEABED (Shape Estimation Algorithm based on BST and Extraction of Directly scattered waves) is known as a fast and highly accurate imaging algorithm for UWB pulse radars [5], [6]. SEABED assumes a system with a scanning antenna or array antennas and fixed targets. This costly type of system is, however, unrealistic for commercial applications such as surveillance systems. To overcome this problem, we proposed a new UWB radar imaging algorithm using the motion of targets instead of a scanning antenna [7-9]. This method has been improved to produce an accurate image of a target with arbitrary motion using three fixed antennas [10]. Numerical simulation showed that the proposed method is effective for accurately estimating a target shape with an RMS error less than 4 mm in a noisy environment with S/N=15 dB [11]. However, an experimental investigation on the proposed method has not yet been performed. This study applies the proposed UWB radar imaging method to experimental data measured in an anechoic chamber, and clarifies that the proposed method accurately estimates the shape of a target with an unknown motion even in an actual environment.