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3D Image Reconstruction of Reinforcing Barand Pipeusing Handy Microwave Radar Scanning System
Jun-ya Takayama,Tsubasa Yoshinaga,Akira Hayakawa,Shinji Ohyama 제어로봇시스템학회 2009 제어로봇시스템학회 국제학술대회 논문집 Vol.2009 No.8
In this report, an advanced signal processing method for microwave radar is considered to recon struct a precise 3D image for inner construction in concrete structursC which consists of reinforcing bars and pipes. An antenna positioning error and an in appropriate signal processing method have caused adegradation of reconstructed images. First, a handy antenna scanning system has been modified, which enables real-time self-position measurement. Concretely, a wheel up lift phenomenonis restrained by stabilizing a compress force to atarget surface, and positioning accuracy can be improved. On the image reconstruction result, a super position of observed data can not operate well in a regions and wiched by two scanned trajectories. Then, apipe-shape model is newly introduced, and the 3D object’s images have been reconstructed assuming that a continuity of buried object based on it. As a result, buried object’s properties can be evaluated more precisely. An effectiveness of aproposed method has been confirmed experimentally, by applying it to a concrete test specimen and an actual wall.
A Novel RF Symmetric Double Sided Two Way Range Finder based on Vernier Effect
Sang-il Ko,Jun-ya Takayama,Shinji Ohyama 제어로봇시스템학회 2008 제어로봇시스템학회 국제학술대회 논문집 Vol.2008 No.10
Recently, study on RF ranging technique has actively been carried out to realize a sensor network system or a localization system. Among such studies, a major portion of researches have been adopting the Received Signal Strength (RSS) as a main measurement method; however, such a measurement method has some limitation and problem in the aspect of performance as well as efficiency. Furthermore, even if there are some investigations on short-range wireless sensor network using time-of-flight of RF, it has difficulties and complexities to realize as well; that is, it needs a specific technique to handle communication packet structure in the aspect of signal processing, and require a little more complicated source of RF signal, e.g., an impulse radio (IR) ultra-wideband (UWB) and chirp spread spectrum (CSS). Therefore, it would be of great interest to investigate for making a RF range system with better performance and simple structure. In this report, we propose an epoch-making technique using SDS-TWR on wireless range measurement in order to realize remarkable wireless range finder with overcoming such problematic points of existing systems and techniques. In addition, we present an easily applicable new signal processing method based on Vernier effect in order to overcome several issues due to the properties of hardware system; such as, the process speed of MCU, a narrow bandwidth of RF signal, and so on.