公开(公告)号：US20220311645A1

公开(公告)日：2022-09-29

申请号：US17611179

申请日：2021-03-17

Applicant: Southeast University

Inventor： Haiming WANG ,  Bensheng YANG ,  Peize ZHANG ,  Chen YU ,  Wei HONG

IPC: H04L25/02

Abstract: Disclosed is a method for estimating dense multipath parameters by means of multipolarized broadband extended array responses, which includes: first transmitting multiple different transmitted signal sequences via a multipolarized antenna array, and processing received data in multiple snapshots according to the known transmitted signals, to obtain channel responses of multipolarized antenna components at all frequency points in a frequency band; extending the obtained channel response matrixes of multiple frequency points in multiple snapshots into a large two-dimensional channel response matrix; then, acquiring a delay parameter regarding multipath propagation by using a reference array element, and estimating two-dimensional departure and arrival angles by using a channel matrix subjected to frequency domain smoothing and dimensionality reduction; and afterwards, pairing the estimated departure and arrival angles, and estimating parameters such as the cross-polarization ratios, the initial phases, and the amplitudes of the sub-paths by using the estimated parameters.

公开(公告)号：US20230152418A1

公开(公告)日：2023-05-18

申请号：US17621688

申请日：2021-03-17

Applicant: SOUTHEAST UNIVERSITY

Inventor： Haiming WANG ,  Bensheng YANG ,  Wenhao WU

IPC: G01S5/02

CPC classification number: G01S5/0273

Abstract: The invention discloses a method for estimating the air propagation delay of a direct wave, wherein an azimuth, an elevation angle and a total delay of a multipath wave reaching a receiving end are obtained through a receiving device; a departure angle of a reflected wave is obtained using a geometric relationship of wave reflection; a hypothetical point on a direct wave ray is selected as a transmitting end, and hereby the air propagation delay of the direct wave and the position of a reflection point of the reflected wave are calculated; the propagation delay and distance of the reflected wave are calculated according to the total delay of the direct wave and the reflected wave and the position of the hypothetical point. The invention can obtain the air propagation delay of the direct wave, thereby obtaining a propagation distance of the direct wave and fulfilling the requirements of ranging and positioning.

公开(公告)号：US20200287277A1

公开(公告)日：2020-09-10

申请号：US16626541

申请日：2018-01-31

Applicant: SOUTHEAST UNIVERSITY

Inventor： Haiming WANG ,  Qi WU ,  Jiexi YIN ,  Chen YU ,  Wei HONG

IPC: H01Q1/38 ,  H01Q1/50 ,  H01Q1/48 ,  H01Q21/24

Abstract: A low-profile broadband circularly-polarized array antenna based on stacked traveling wave antenna elements, includes: a circularly-polarized antenna element composed of three segments connected in an end-to-end manner of metal layers printed on two sides of a dielectric slab and a metallized via connecting two layers; a 2×2 antenna sub-array composed of a metallized via cavity and four antenna elements; a 16-way full-parallel feeding network composed of the metallized vias; slots for coupled feeding between feeding layers and metal cavities and the antenna; and a switching structure for testing between a grounded coplanar waveguide (GCPW) and a substrate integrated waveguide (SIW). An antenna array designed can be manufactured by using a printed circuit board process. The antenna array can realize circularly polarized radiation in a very broad frequency band.