Patents by Inventor Mai Sakamoto

Mai Sakamoto has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Patent number: 11014518
    Abstract: An estimation device includes an information acquisition unit, a detection determination unit, a direction determination unit, and a direction estimation unit. When an object is a first-time detected object, the direction determination unit determines whether a relative direction acquired by the information acquisition unit is a direction toward an own vehicle. When the relative direction acquired by the information acquisition unit is a direction toward the own vehicle, the direction estimation unit estimates that a direction predetermined according to an object position acquired by the information acquisition unit is the movement direction of the object.
    Type: Grant
    Filed: May 2, 2017
    Date of Patent: May 25, 2021
    Assignees: SOKEN, INC., DENSO CORPORATION
    Inventors: Yusuke Akamine, Mitsuyasu Matsuura, Mai Sakamoto
  • Patent number: 10877140
    Abstract: A radar device calculates positions and relative velocities of points of reflection from an FMCW beat signal, extracts stationary reflection points each being a point of reflection having a relative velocity of zero, and sets, for each of the stationary reflection points, an object area estimated to contain an object including the stationary reflection point. The radar device calculates positions and relative velocities of points of reflection from a 2CW beat signal from which a DC component has been removed, extracts in-area reflection points each being a point of reflection that belongs to the object area. The radar device then computes, for each of the in-area reflection points, a cross velocity that is a velocity of the in-area reflection point in a cross-range direction, and statistically processes calculated cross velocities for each of the object areas. The radar device calculates an estimated value of a cross velocity of an object.
    Type: Grant
    Filed: June 7, 2017
    Date of Patent: December 29, 2020
    Assignee: DENSO CORPORATION
    Inventors: Mai Sakamoto, Koichiro Suzuki
  • Publication number: 20190242987
    Abstract: A radar device calculates positions and relative velocities of points of reflection from an FMCW beat signal, extracts stationary reflection points each being a point of reflection having a relative velocity of zero, and sets, for each of the stationary reflection points, an object area estimated to contain an object including the stationary reflection point. The radar device calculates positions and relative velocities of points of reflection from a 2CW beat signal from which a DC component has been removed, extracts in-area reflection points each being a point of reflection that belongs to the object area. The radar device then computes, for each of the in-area reflection points, a cross velocity that is a velocity of the in-area reflection point in a cross-range direction, and statistically processes calculated cross velocities for each of the object areas. The radar device calculates an estimated value of a cross velocity of an object.
    Type: Application
    Filed: June 7, 2017
    Publication date: August 8, 2019
    Inventors: Mai SAKAMOTO, Koichiro SUZUKI
  • Patent number: 10353063
    Abstract: A radar apparatus includes a targeting unit that irradiates a radar wave and recognizes a detection subject using a reflected wave thereof. The targeting unit extracts, as a target, a peak that is confirmed to have historical connection over measurement cycles equal to or more than a predetermined targeting threshold, from peaks extracted from a power spectrum generated by frequency analysis. A rainy-weather determining unit determines that weather is rainy when a number of erroneous detections is greater than a predetermined rainy-weather determination threshold. The number of erroneous detections is a number of peaks that have been detected in a previous measurement cycle or earlier by the targeting unit and are not confirmed to have historical connection to a peak detected in a current measurement cycle.
    Type: Grant
    Filed: May 26, 2015
    Date of Patent: July 16, 2019
    Assignee: DENSO CORPORATION
    Inventors: Mai Sakamoto, Koichiro Suzuki
  • Publication number: 20190143925
    Abstract: An estimation device includes an information acquisition unit, a detection determination unit, a direction determination unit, and a direction estimation unit. When an object is a first-time detected object, the direction determination unit determines whether a relative direction acquired by the information acquisition unit is a direction toward an own vehicle. When the relative direction acquired by the information acquisition unit is a direction toward the own vehicle, the direction estimation unit estimates that a direction predetermined according to an object position acquired by the information acquisition unit is the movement direction of the object.
    Type: Application
    Filed: May 2, 2017
    Publication date: May 16, 2019
    Inventors: Yusuke AKAMINE, Mitsuyasu MATSUURA, Mai SAKAMOTO
  • Patent number: 10077979
    Abstract: An estimation apparatus includes a distance estimator. The distance estimator performs regression analysis using, as samples, an observation of distance and an observation at each time within a predetermined period obtained by an observer. The estimation apparatus estimates that a value of the distance upon a value of a displacement calculated in accordance with a regression equation based on the regression analysis being zero shows a value of the distance to the forward object at a start time.
    Type: Grant
    Filed: March 4, 2014
    Date of Patent: September 18, 2018
    Assignee: DENSO CORPORATION
    Inventors: Mai Sakamoto, Koichiro Suzuki
  • Publication number: 20170102459
    Abstract: A radar apparatus includes a targeting unit that irradiates a radar wave and recognizes a detection subject using a reflected wave thereof. The targeting unit extracts, as a target, a peak that is confirmed to have historical connection over measurement cycles equal to or more than a predetermined targeting threshold, from peaks extracted from a power spectrum generated by frequency analysis. A rainy-weather determining unit determines that weather is rainy when a number of erroneous detections is greater than a predetermined rainy-weather determination threshold. The number of erroneous detections is a number of peaks that have been detected in a previous measurement cycle or earlier by the targeting unit and are not confirmed to have historical connection to a peak detected in a current measurement cycle.
    Type: Application
    Filed: May 26, 2015
    Publication date: April 13, 2017
    Inventors: Mai Sakamoto, Koichiro Suzuki
  • Publication number: 20160018219
    Abstract: An estimation apparatus includes a distance estimator. The distance estimator performs regression analysis using, as samples, an observation of distance and an observation at each time within a predetermined period obtained by an observer. The estimation apparatus estimates that a value of the distance upon a value of a displacement calculated in accordance with a regression equation based on the regression analysis being zero shows a value of the distance to the forward object at a start time.
    Type: Application
    Filed: March 4, 2014
    Publication date: January 21, 2016
    Inventors: Mai Sakamoto, Koichiro Suzuki
  • Patent number: 8781644
    Abstract: An example of recognition of the shape of a road where a vehicle travels is provided. An object type as to whether an object is a moving or stationary object is determined according to a relative speed of the object and a speed of the vehicle. Object-unit data effective for recognizing a road shape is extracted according to the determination. The object-unit data is used for forming data of a roadside object group, based on which a road edge is recognized. A series of the processes is repeatedly performed at a predetermined cycle. After the extraction process, a data addition process is performed to add object-unit data obtained in the extraction process of the previous cycle to object-unit data obtained in the extraction process of the present cycle. In a recognition process, a road edge is recognized according to the object-unit data obtained in the data addition process.
    Type: Grant
    Filed: March 20, 2012
    Date of Patent: July 15, 2014
    Assignee: Denso Corporation
    Inventors: Yoshie Samukawa, Toyohito Nozawa, Mai Sakamoto, Hiroshi Ookata
  • Publication number: 20120271483
    Abstract: An example of recognition of the shape of a road where a vehicle travels is provided. An object type as to whether an object is a moving or stationary object is determined according to a relative speed of the object and a speed of the vehicle. Object-unit data effective for recognizing a road shape is extracted according to the determination. The object-unit data is used for forming data of a roadside object group, based on which a road edge is recognized. A series of the processes is repeatedly performed at a predetermined cycle. After the extraction process, a data addition process is performed to add object-unit data obtained in the extraction process of the previous cycle to object-unit data obtained in the extraction process of the present cycle. In a recognition process, a road edge is recognized according to the object-unit data obtained in the data addition process.
    Type: Application
    Filed: March 20, 2012
    Publication date: October 25, 2012
    Applicant: DENSO CORPORATION
    Inventors: Yoshie Samukawa, Toyohito Nozawa, Mai Sakamoto, Hiroshi Ookata
  • Patent number: 8169361
    Abstract: A sampled beat signal RD is split into a plurality of short-time data SD in the time direction, for each of antenna elements. Interference component frequency of an interference wave is detected from a frequency spectrum of the short-time data SD. A digital beam forming process is performed for the interference component frequency of the interference wave to extract a peak of the electrical power of an azimuth direction and estimate an absolute value of an incoming direction of interference components. Based on the absolute value of the incoming direction of the estimated interference components, a filter for suppressing the interference components is operated to suppress the interference components.
    Type: Grant
    Filed: December 26, 2007
    Date of Patent: May 1, 2012
    Assignee: Denso Corporation
    Inventors: Chiharu Yamano, Kazuma Natsume, Yuu Watanabe, Mai Sakamoto
  • Patent number: 7907083
    Abstract: A FMCW-type radar device generates snapshot data from a beat signal that represents a received condition of the radar device every modulation period. Auto-correlation matrices generated by the snapshot data every modulation period are averaged every set of plural periods. The radar device calculates the target azimuth of a target object such as a preceding vehicle based on the averaged auto-correlation matrix based on MUSIC (MUltiple SIgnal Classification) method. This averaging is performed by weighting average based on an amount of mixed noise (or an interference amount) contained in the snapshot data in each modulation period. A weighting coefficient to be applied to the auto-correlation matrix in each modulation period is set to a value corresponding to the amount of mixed noise, namely, the interference amount of this modulation period. The weighting coefficient becomes large when the interference amount is small, and on the other hand, becomes small when it is large.
    Type: Grant
    Filed: September 15, 2009
    Date of Patent: March 15, 2011
    Assignee: Denso Corporation
    Inventors: Mai Sakamoto, Kazuma Natsume, Yuu Watanabe, Hideki Shirai, Chiharu Yamano
  • Patent number: 7760133
    Abstract: In a FM-CW or CW radar apparatus, when interference components are contained in channel signals obtained as beat signals from array antenna elements of respective channels, and the interference components result from directly receiving transmitted CW radar waves from an external source, phase shifting is applied to each of the channel signals to shift respective phases of the interference components of the respective channels to a condition corresponding to reception of interference waves from a predetermined direction. The interference components are then eliminated, and reverse phase shifting is applied to restore remaining components of the channel signals to their original phase condition.
    Type: Grant
    Filed: November 12, 2008
    Date of Patent: July 20, 2010
    Assignee: DENSO CORPORATION
    Inventors: Hideki Shirai, Chiharu Yamano, Kazuma Natsume, Yuu Watanabe, Mai Sakamoto
  • Patent number: 7728762
    Abstract: A method for detecting an occurrence of interference between a return of a radar wave which has been transmitted by a radar and has an oscillating amplitude in time and a radio wave transmitted by some other radar, Includes steps of: detecting extremal points of an incident radio wave in which the radio wave transmitted by the other radar is superposed on the return of the radar wave, extracting, sequentially in time, an emerging pattern of the extremal points of the incident radio wave within each of periods of time to obtain a series of emerging patterns of the extremal points, detecting a period during which the emerging pattern of the extremal points is irregular among the series of the emerging patterns of the extremal points, and determining that the interference occurs during the detected period of time.
    Type: Grant
    Filed: March 20, 2008
    Date of Patent: June 1, 2010
    Assignee: Denso Corporation
    Inventor: Mai Sakamoto
  • Publication number: 20100073216
    Abstract: A FMCW-type radar device generates snapshot data from a beat signal that represents a received condition of the radar device every modulation period. Auto-correlation matrices generated by the snapshot data every modulation period are averaged every set of plural periods. The radar device calculates the target azimuth of a target object such as a preceding vehicle based on the averaged auto-correlation matrix based on MUSIC (MUltiple SIgnal Classification) method. This averaging is performed by weighting average based on an amount of mixed noise (or an interference amount) contained in the snapshot data in each modulation period. A weighting coefficient to be applied to the auto-correlation matrix in each modulation period is set to a value corresponding to the amount of mixed noise, namely, the interference amount of this modulation period. The weighting coefficient becomes large when the interference amount is small, and on the other hand, becomes small when it is large.
    Type: Application
    Filed: September 15, 2009
    Publication date: March 25, 2010
    Applicant: DENSO CORPORATION
    Inventors: Mai Sakamoto, Kazuma Natsume, Yuu Watanabe, Hideki Shirai, Chiharu Yamano
  • Publication number: 20100019950
    Abstract: A sampled beat signal RD is split into a plurality of short-time data SD in the time direction, for each of antenna elements. Interference component frequency of an interference wave is detected from a frequency spectrum of the short-time data SD. A digital beam forming process is performed for the interference component frequency of the interference wave to extract a peak of the electrical power of an azimuth direction and estimate an absolute value of an incoming direction of interference components. Based on the absolute value of the incoming direction of the estimated interference components, a filter for suppressing the interference components is operated to suppress the interference components.
    Type: Application
    Filed: December 26, 2007
    Publication date: January 28, 2010
    Applicant: DENSO CORPORATION
    Inventors: Chiharu Yamano, Kazuma Natsume, Yuu Watanabe, Mai Sakamoto
  • Patent number: 7567204
    Abstract: A method for a radar for detecting a noise floor level of an electric signal corresponding to an incident radio wave received by the radar, the incident radio wave including a return of a radar wave that is transmitted from the radar toward a measuring range of the radar to detect target object characteristic including presence of a target object within the measuring range of the radar, a distance between the target object and the radar, and a relative speed of the target object to the radar is provided. The method includes steps of: calculating a histogram of intensities of frequency components, the frequency components exceeding a predetermined value relating to the measuring range, and extracting an intensity having the maximum height in the histogram as the noise floor level of the electric signal.
    Type: Grant
    Filed: March 19, 2008
    Date of Patent: July 28, 2009
    Assignee: DENSO CORPORATION
    Inventor: Mai Sakamoto
  • Publication number: 20090121918
    Abstract: In a FM-CW or CW radar apparatus, when interference components are Contained in channel signals obtained as beat signals from array antenna elements of respective channels, and the interference components result from directly receiving transmitted CW radar waves from an external source, phase shifting is applied to each of the channel signals to shift respective phases of the interference components of the respective channels to a condition corresponding to reception of interference waves from a predetermined direction. The interference components are then eliminated, and reverse phase shifting is applied to restore remaining components of the channel signals to their original phase condition.
    Type: Application
    Filed: November 12, 2008
    Publication date: May 14, 2009
    Applicant: DENSO CORPORATION
    Inventors: Hideki Shirai, Chiharu Yamano, Kazuma Natsume, Yuu Watanabe, Mai Sakamoto
  • Publication number: 20090096661
    Abstract: A method for a radar for determining a level of interference of return of a radar wave transmitted by the radar from a target object and radio wave transmitted by some other radar, and a radar, in particular a frequency modulated continuous wave (FMCW) radar, that performs the method for determining the level of interference between the radar and some other radar is provided. In the method according to the present invention, after incident radio wave received by the radar is subjected by a frequency analysis to obtain frequency spectrum characteristic of the incident radio wave, one of frequency components of incident radio wave, the one of the frequency components having larger intensity than a predetermined intensity threshold value is not used to calculate a reference value that indicates the level of interference.
    Type: Application
    Filed: March 19, 2008
    Publication date: April 16, 2009
    Applicant: DENSO CORPORATION
    Inventor: Mai Sakamoto
  • Patent number: 7495605
    Abstract: A radar apparatus includes a receiving means that receives a reflected signal, a beat signal generation means that generates beat signals based on the reflected signal, a correlation matrix generation means that calculates correlation matrices based on the beat signals, a storing means that stores previous correlation matrices, an addition means that calculates addition correlation matrices by adding the correlation matrices to the previous correlation matrices, a detection means that detects a frequency component satisfying a predetermined condition by using the beat signals, an extraction means that extracts an extraction matrix corresponding to the detected frequency from the addition correlation matrices, and a direction calculation means that calculates a direction of the object with respect to the radar apparatus based on the extraction matrix.
    Type: Grant
    Filed: July 31, 2006
    Date of Patent: February 24, 2009
    Assignee: DENSO Corporation
    Inventors: Mai Sakamoto, Kazuma Natsume, Yasuyuki Miyake