Through-the-Wall Localization of a Moving Target by Two Independent Ultra Wideband (UWB) Radar Systems

Abstract

In the case of through-the-wall localization of moving targets by ultra wideband (UWB) radars, there are applications in which handheld sensors equipped only with one transmitting and two receiving antennas are applied. Sometimes, the radar using such a small antenna array is not able to localize the target with the required accuracy. With a view to improve through-the-wall target localization, cooperative positioning based on a fusion of data retrieved from two independent radar systems can be used. In this paper, the novel method of the cooperative localization referred to as joining intersections of the ellipses is introduced. This method is based on a geometrical interpretation of target localization where the target position is estimated using a properly created cluster of the ellipse intersections representing potential positions of the target. The performance of the proposed method is compared with the direct calculation method and two alternative methods of cooperative localization using data obtained by measurements with the M-sequence UWB radars. The direct calculation method is applied for the target localization by particular radar systems. As alternative methods of cooperative localization, the arithmetic average of the target coordinates estimated by two single independent UWB radars and the Taylor series method is considered.

Multiple moving person tracking by UWB sensors: the effect of mutual shielding persons and methods reducing its impacts

“…It consists of seven basic phases, such as background subtraction, target detection, time of arrival (TOA) estimation and TOA association, wall effect compensation, target localization and target tracking. For their implementation, the following methods were used: exponential averaging, constant false alarm rate (CFAR) detector [53,54], trace connection method [26], trace correction of the 1st kind [55], direct method of localization [23,56] and MTT system [23,27] using linear Kalman filtering. The clarification of the particular phase importance and the description of methods of their implementations are beyond this paper.…”

Improved Detection of Human Respiration Using Data Fusion Basedon a Multistatic UWB Radar

“…In recent years, remote sensing of human targets with ultra-wideband (UWB) radar has attracted increasing attention [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17]. Since electromagnetic waves transmitted by UWB radar can penetrate through obstacles, such as clothes, walls, building ruins, etc., this technology can be applied in many areas, like medicine, public security, emergence rescue, and so on [1][2][3][4].…”

Investigation of the Existence of Thermal Insulations in Wall Systems of Building Envelopes Using Uwb Technique

“…In both cases, there is no adequate information that can be extracted from the reflected or passed signals that can indicate the nature of materials inside an object. Seeing through a wall is largely based on recording received signals reflected from moving objects located behind that wall with or without known characteristics [16][17][18][19][20][21][22]. Localizing objects behind a wall can be done by various processing methods performed on the received response signals.…”

“…Localizing objects behind a wall can be done by various processing methods performed on the received response signals. Ultra-wideband (UWB) signal technology was the main method used [16][17][18][19][20][21][22]. Previously, there were some attempts to use Wi-Fi technology [23].…”

“…Previously, there were some attempts to use Wi-Fi technology [23]. Some studies were conducted to detect what was inside the walls [16][17][18][19][20][21][22]. However, the focus of those studies was on transit events, such as moisture concentration [24].…”