Study of Ground Penetrating Radar with Near Field Array Antenna and Direction of Arrival Finding System Implemented with Rotman Lens Array Antenna

• Main Authors: Ping-Chieh Chiang, 江秉杰
• Other Authors: Wen-Jiao Liao
• Format: Others
• Language: zh-TW
• Published: 2013
• Online Access: http://ndltd.ncl.edu.tw/handle/36754911790334168709

碩士 === 國立臺灣科技大學 === 電機工程系 === 101 === In the first part of this thesis, the proposed ground penetrating radar, which is consist of six broadband Vivaldi antennas, provides detection of target and the target's image in the near-field range. Reflection coefficient spectrum of each element antenna are used to derive the time domain reflection profile. The proposed beam focusing algorithm, which is based on a time-shift method, can enhance the target's reflection. By combining focused results at different locations, the radar system can produce the image that reveals the target location. In the second part, an implementation of direction-of-arrival estimation algorithm using Rotman lens array antenna is proposed. The algorithm is based on a magnitude comparison method. The Rotman lens array provides multiple beam toward different directions simultaneously. The planar Rotman lens designed consists of 6 antenna ports and 13 beam ports. The prototype was fabricated with a printed circuit board. Array patterns is verified in a spherical near-field chamber, while the DoA algorithm was implemented offline using data taken from an open site. According to the experiment result, the estimation error of developed DoA system is less than 1 degree.