Title:
RADAR DEVICE
Document Type and Number:
WIPO Patent Application WO/2023/144980
Kind Code:
A1
Abstract:
The purpose of the present invention is to provide a radar device that allows for high-resolution angle estimation with simple equipment. This radar device is characterized by comprising: a transmission unit that generates a chirp wave using a transmission signal of which the frequency continuously increases or decreases and that transmits the chirp wave; a beat signal generation unit that generates a beat signal from the transmission signal and a reception signal obtained through each of receiving antennas receiving a reflected wave resulting from the chirp wave reflected by a target; a transform unit that transforms the beat signal into a frequency spectrum showing the distribution of signal intensity with respect to distance from the target and relative velocity; a peak detection unit that detects a peak signal from the frequency spectrum; a reception signal vector generation unit that generates a first reception signal vector from a signal of each receiving antenna corresponding to the peak signal; a first angle estimation unit that performs a first angle estimation process on the first reception signal vector to generate a first spatial spectrum showing the distribution of signal intensity with respect to arrival angle of the reflected wave; a subtraction processing unit that generates a replica signal assuming an arrival wave from an arrival angle of a first peak signal included in the first spatial spectrum generated by the first angle estimation unit and that subtracts the replica signal from the first reception signal vector to generate a second reception signal vector; a second angle estimation unit that performs a second angle estimation process on the second reception signal vector to generate a second spatial spectrum; and a target position estimation unit that selects which of the first spatial spectrum and the second spatial spectrum is used for target position estimation on the basis of the relationship between a set threshold value and the difference between the level of the first peak signal included in the first spatial spectrum and the level of a second peak signal included in the second spatial spectrum.
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Inventors:
TAKEDA SHIGEKI (JP)
KURODA HIROSHI (JP)
KURODA HIROSHI (JP)
Application Number:
PCT/JP2022/003224
Publication Date:
August 03, 2023
Filing Date:
January 28, 2022
Export Citation:
Assignee:
HITACHI ASTEMO LTD (JP)
International Classes:
G01S7/02; G01S13/34; G01S13/58
Foreign References:
| JP2019078628A | 2019-05-23 | |||
| JP2015143651A | 2015-08-06 | |||
| JP2008045880A | 2008-02-28 | |||
| JP2020139876A | 2020-09-03 | |||
| JP2006201034A | 2006-08-03 | |||
| KR20160134436A | 2016-11-23 |
Other References:
SUN RAN; SAKAI JUNICHIROU; SUZUKI KOUHEI; ZHENG JIAYING; TAKEDA SHIGEKI; UMEHIRA MASAHIRO; WANG XIAOYAN; KURODA HIROSHI: "Antenna Element Space Interference Cancelling Radar for Angle Estimations of Multiple Targets", IEEE ACCESS, IEEE, USA, vol. 9, 11 May 2021 (2021-05-11), USA , pages 72547 - 72555, XP011855191, DOI: 10.1109/ACCESS.2021.3078895
Attorney, Agent or Firm:
POLAIRE I.P.C. (JP)
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