Study of UHF Bistatic Radar Cross Section and Directive Array Antenna

• Main Authors: Chih-yao Hsieh, 謝志堯
• Other Authors: Wen-Jiao Liao
• Format: Others
• Language: zh-TW
• Published: 2010
• Online Access: http://ndltd.ncl.edu.tw/handle/25254542332980493552

碩士 === 國立臺灣科技大學 === 電機工程系 === 98 === In this thesis, measurements and simulation were conducted to study the bistatic radar cross section of airborne targets, which is critical to the realization of passive radar. The scattering measurements were performed in the UHF band. By altering parameters such as the target range and incident angle, we studied the changes in the amount of scattering to identify the scattering mechanism. Simulations were also performed to compare with measurement results. The differences were used to identify problems in the current measurement setup. This research also developed two RF circuit devices to help facilitating the passive radar receiver. One is a simulation board useful to the development of direction-of-arrival algorithm on receiver. The board emulates the phase differences received by 4 RF tuners due to 2 sources from different angles. The other device is used to switch the tuner inputs from antennas to the same controlled RF sources, so that the clocks of individual receivers can be synchronized. In this thesis, we also propose a electronically controlled beam switching antenna array in UHF band. By employing RF switches, 4 adjacent antenna elements are selected among 16 patch antennas to produce a directive beam. The antenna can be used as the receiving antenna of a passive radar. By employing time division method, the array system can therefore cover the azimuth plane via the switching beam.