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Ray-optical prediction of radio-wave propagation characteristics in tunnel environments-Part 2 : analysis and measurements

หน่วยงาน Nanyang Technological University, Singapore

รายละเอียด

ชื่อเรื่อง : Ray-optical prediction of radio-wave propagation characteristics in tunnel environments-Part 2 : analysis and measurements
นักวิจัย : Zhang, Yue Ping , Hwang, Y. , Kouyoumjian, Robert G.
คำค้น : DRNTU::Engineering::Electrical and electronic engineering::Optics, optoelectronics, photonics.
หน่วยงาน : Nanyang Technological University, Singapore
ผู้ร่วมงาน : -
ปีพิมพ์ : 2541
อ้างอิง : Zhang, Y. P., Hwang, Y., & Kouyoumjian, R. G. (1998). Ray-optical prediction of radio-wave propagation characteristics in tunnel environments-Part 2: Analysis and measurements. IEEE Transactions on Antennas and Propagation, 46(9), 1337-1345. , 0018-926X , http://hdl.handle.net/10220/5945 , http://dx.doi.org/10.1109/8.719977
ที่มา : -
ความเชี่ยวชาญ : -
ความสัมพันธ์ : IEEE transactions on antennas and propagation
ขอบเขตของเนื้อหา : -
บทคัดย่อ/คำอธิบาย :

The uniform theory of diffraction (UTD) developed in Part 1 is used to predict narrow- and wide-band propagation characteristics in tunnels at 900- and 1800-MHz frequencies. Narrow-band propagation characteristics is shown in spatial domain and wide-band propagation in time domain. In empty straight-tunnel environments, propagation exhibits a break-point phenomenon and has very short time delay spread. In empty curved or branched tunnel environments, propagation suffers higher loss. Vehicles cause additional propagation loss and larger varying time delay spread in tunnels. The measured results have validated the accuracy of the theoretical model and provided important information on narrow-band and wide-band propagation characteristics in empty, branched and obstructed tunnels.

บรรณานุกรม :
Zhang, Yue Ping , Hwang, Y. , Kouyoumjian, Robert G. . (2541). Ray-optical prediction of radio-wave propagation characteristics in tunnel environments-Part 2 : analysis and measurements.
    กรุงเทพมหานคร : Nanyang Technological University, Singapore.
Zhang, Yue Ping , Hwang, Y. , Kouyoumjian, Robert G. . 2541. "Ray-optical prediction of radio-wave propagation characteristics in tunnel environments-Part 2 : analysis and measurements".
    กรุงเทพมหานคร : Nanyang Technological University, Singapore.
Zhang, Yue Ping , Hwang, Y. , Kouyoumjian, Robert G. . "Ray-optical prediction of radio-wave propagation characteristics in tunnel environments-Part 2 : analysis and measurements."
    กรุงเทพมหานคร : Nanyang Technological University, Singapore, 2541. Print.
Zhang, Yue Ping , Hwang, Y. , Kouyoumjian, Robert G. . Ray-optical prediction of radio-wave propagation characteristics in tunnel environments-Part 2 : analysis and measurements. กรุงเทพมหานคร : Nanyang Technological University, Singapore; 2541.