公开(公告)号：US20170139042A1

公开(公告)日：2017-05-18

申请号：US15322856

申请日：2015-07-01

Applicant: DENSO CORPORATION

Inventor： Klas ALENLJUNG ,  Yoshihiro ABE

IPC: G01S13/44 ,  G01S13/93 ,  G01S7/292

Abstract: A radar apparatus includes: a transmitting portion including transmitter elements that emits a transmitting signal as a radar wave toward an object; a receiving portion including receiver elements receiving a reflection signal; and an estimation portion. The estimation portion generates a virtual receiving array including virtual receiver elements. The estimation portion divides the virtual receiving array into identical sub-arrays. The estimation portion generates covariance matrix data for each of the sub-arrays. The estimation portion averages the covariance matrix data for each of the sub-arrays to decorrelate a direct reflection signal from the object and multipath reflection signal among the reflection signal and spatially smooths the reflection signal. The estimation portion resolves the direct reflection signal from the object and the multipath reflection signal. The estimation portion determines the direction of the object.

公开(公告)号：US20200271830A1

公开(公告)日：2020-08-27

申请号：US16872233

申请日：2020-05-11

Applicant: DENSO CORPORATION

Inventor： Yoshihiro ABE ,  Toshiaki WATANABE ,  Shinichiro MATSUZAWA

IPC: G02B1/118 ,  G02B1/115 ,  B60R1/00 ,  G01S13/931

Abstract: An antireflection structure includes an antireflection film provided on a front surface of a substrate. The antireflection film has a plurality of holes that are spatially and periodically arranged and pass through front and back surfaces of the antireflection film. A thickness and a relative dielectric constant of the antireflection film are set according to a relative dielectric constant and a thickness of the substrate and an incident angle θ of an electromagnetic wave. The thickness and the relative dielectric constant of the antireflection film are set for an electromagnetic wave incident at the angle θ so that, for example, an electromagnetic wave reflected by the antireflection film provided on the front surface of the substrate and an electromagnetic wave reflected by a back surface of the substrate deviate from each other by a half wavelength and cancel each other.