Patents by Inventor Hisateru Asanuma
Hisateru Asanuma 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).
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Publication number: 20130030769Abstract: Provided is a signal processing apparatus configured to calculate an angle of a detection point corresponding to an object on the basis of received signals of a plurality of array antennas. A beat signal is generated by a difference between a transmitted signal and a received signal. Digital data is derived through AD conversion of the beat signal. The digital data is divided into a plurality of data groups. A fast Fourier transform is performed on the data groups to acquire a plurality of transformed data corresponding to the number of the data groups. The transformed data are divided into a plurality of sets, correlation matrices for the respective sets are acquired, and an average value of the correlation matrices is calculated. The angle of the detection point is calculated on the basis of the average value of the correlation matrices.Type: ApplicationFiled: July 18, 2012Publication date: January 31, 2013Applicant: FUJITSU TEN LIMITEDInventor: Hisateru ASANUMA
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Publication number: 20120306685Abstract: A reflected wave that a transmitted wave is reflected by targets including a stationary target and a moving target is received as receiving signals of at least two reception antennas. A phase difference between beat signals at respective peak frequencies, generated from a transmitting signal and the receiving signals, is calculated. Directions of the targets are calculated in such a manner that the calculated phase difference of the targets is stored in a storage area in advance, it is predicted whether peak frequencies of the plurality of targets overlap each other, a predicted phase difference of the stationary target at the time when the peak frequencies overlap each other is calculated on the basis of the stored phase difference, and a predicted phase difference of the moving target is calculated on the basis of the calculated phase difference and the predicted phase difference of the stationary target.Type: ApplicationFiled: January 26, 2011Publication date: December 6, 2012Applicant: TOYOTA JIDOSHA KABUSHIKI KAISHAInventors: Hisateru Asanuma, Masahiro Sakaguchi, Tomoya Kawasaki, Motomi Iyoda
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Publication number: 20120223855Abstract: There is provided a radar apparatus of an electronic scan type configured to transmit an electric wave and calculate an angle of a target based on a phase difference of respective reception signals, thereby detecting a target position. An antenna unit transmits and receives the electric wave and provided with two transmission antennae. A transmission unit alternately transmits an electric wave having a first beam pattern and an electric wave having a second beam pattern from the two transmission antennae. First and second reception units calculate arrival angles and reception levels of reflected waves calculated from respective reception signals which are obtained by receiving the reflected waves by the first and second beam patterns. A comparison unit compares the reception levels by combining the arrival angles of the reflected waves. A determination unit determines whether a target actually exists at the arrival angles in accordance a comparison result.Type: ApplicationFiled: February 29, 2012Publication date: September 6, 2012Applicant: FUJITSU TEN LIMITEDInventors: Yasuhiro KURONO, Tomohiro SHINOMIYA, Hisateru ASANUMA
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Patent number: 8179303Abstract: A signal processing apparatus for a radar transceiver, which receives a reflected signal generated by a target object in response to a frequency modulated transmission signal, and generates a beat signal having a frequency difference between the transmission signal and a reception signal, includes: an azimuth angle detection unit that detects an azimuth angle of the target object on the basis of a peak signal in a frequency spectrum of the beat signal; a peak signal extraction unit that prioritizes extraction of a peak signal corresponding to a predetermined azimuth angle range and a predetermined relative distance range of the target object; and a target object detection unit that detects the target object from the extracted peak signal.Type: GrantFiled: August 5, 2009Date of Patent: May 15, 2012Assignee: Toyota Jidosha Kabushiki KaishaInventors: Masayuki Kishida, Hisateru Asanuma, Tomoya Kawasaki
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Patent number: 8164511Abstract: In order to prevent delays in output of detection results, even when a plurality of frequency modulation methods with different frequency change rates are used, an FM-CW radar device employing frequency modulation with two different frequency change rates, has distance/velocity detection unit for detecting the relative distance or relative velocity of a target object based on beat signals of transmission signals with the same frequency change rate and for detecting the relative distance or relative velocity using beat signals when the frequency change rates are different, and distance/velocity confirmation unit for adding evaluation values for relative distances or relative velocities detected in the detection processing, and for confirming the relative distance or relative velocity based on the evaluation value which has reached a criterion value. As a result, more data can be obtained in one detection cycle, and the same advantageous results as when executing a plurality of detection cycles can be obtained.Type: GrantFiled: August 4, 2009Date of Patent: April 24, 2012Assignee: Fujitsu Ten LimitedInventors: Masayuki Kishida, Hisateru Asanuma, Kohsuke Noda, Tomoya Kawasaki
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Patent number: 8054216Abstract: A radar device has a plurality of receiving antennas which receive, as a reception wave, a radar wave sent in a predetermined reference direction and reflected by a target; a phase difference detection unit which detects a first phase difference of the reception wave received by a first receiving antenna pair that is spaced by a first gap, and a second phase difference of the reception wave received by a second receiving antenna pair that is spaced by a second gap smaller than the first gap; and an angle detection unit which performs a first process of determining, as a detection angle, an angle of the target relative to the reference direction being a mutually coincident angle from among a plurality of first angles corresponding to the first phase difference and a plurality of second angles corresponding to the second phase difference. The radar device allows expanding an angle detection range without reducing the resolution of the angle corresponding to the second phase difference.Type: GrantFiled: January 26, 2009Date of Patent: November 8, 2011Assignees: Fujitsu Ten Limited, Toyota Jidosha Kabushiki KaishaInventors: Motohide Kinoshita, Hisateru Asanuma, Jun Tsunekawa, Motomi Iyoda, Tomoya Kawasaki
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Patent number: 7911374Abstract: A target position is estimated in such a manner to maintain target position continuity, with high accuracy, even when the X coordinate displacement of the target is large. On a scan in which the target position is not detected, when a trajectory of the target in the past is within a predetermined region in the vicinity of the Y-axis, a position for estimate is a position having an X coordinate resulting from shifting, by a first displacement, the X coordinate estimated according to the trajectory, on a basis of the X coordinate of a previous position, while when the trajectory is not within the predetermined region, the position for estimate is a position having an X coordinate resulting from shifting, by a second displacement that is larger than the first displacement, the X coordinate estimated according to the trajectory, on a basis of the X coordinate of a previous position.Type: GrantFiled: January 26, 2009Date of Patent: March 22, 2011Assignee: Fujitsu Ten LimitedInventors: Takumi Moriuchi, Masahiro Sakaguchi, Hisateru Asanuma, Tomoya Kawasaki, Jun Tsunekawa, Motomi Iyoda
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Publication number: 20100033364Abstract: In order to prevent delays in output of detection results, even when a plurality of frequency modulation methods with different frequency change rates are used, an FM-CW radar device employing frequency modulation with two different frequency change rates, has distance/velocity detection unit for detecting the relative distance or relative velocity of a target object based on beat signals of transmission signals with the same frequency change rate and for detecting the relative distance or relative velocity using beat signals when the frequency change rates are different, and distance/velocity confirmation unit for adding evaluation values for relative distances or relative velocities detected in the detection processing, and for confirming the relative distance or relative velocity based on the evaluation value which has reached a criterion value. As a result, more data can be obtained in one detection cycle, and the same advantageous results as when executing a plurality of detection cycles can be obtained.Type: ApplicationFiled: August 4, 2009Publication date: February 11, 2010Applicant: FUJITSU TEN LIMITEDInventors: Masayuki Kishida, Hisateru Asanuma, Kohsuke Noda, Tomoya Kawasaki
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Publication number: 20100033365Abstract: A signal processing apparatus for a radar transceiver, which receives a reflected signal generated by a target object in response to a frequency modulated transmission signal, and generates a beat signal having a frequency difference between the transmission signal and a reception signal, includes: an azimuth angle detection unit that detects an azimuth angle of the target object on the basis of a peak signal in a frequency spectrum of the beat signal; a peak signal extraction unit that prioritizes extraction of a peak signal corresponding to a predetermined azimuth angle range and a predetermined relative distance range of the target object; and a target object detection unit that detects the target object from the extracted peak signal.Type: ApplicationFiled: August 5, 2009Publication date: February 11, 2010Applicant: TOYOTA JIDOSHA KABUSHIKI KAISHAInventors: Masayuki KISHIDA, Hisateru ASANUMA, Tomoya KAWASAKI
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Publication number: 20090207071Abstract: A radar device has a plurality of receiving antennas which receive, as a reception wave, a radar wave sent in a predetermined reference direction and reflected by a target; a phase difference detection unit which detects a first phase difference of the reception wave received by a first receiving antenna pair that is spaced by a first gap, and a second phase difference of the reception wave received by a second receiving antenna pair that is spaced by a second gap smaller than the first gap; and an angle detection unit which performs a first process of determining, as a detection angle, an angle of the target relative to the reference direction being a mutually coincident angle from among a plurality of first angles corresponding to the first phase difference and a plurality of second angles corresponding to the second phase difference. The radar device allows expanding an angle detection range without reducing the resolution of the angle corresponding to the second phase difference.Type: ApplicationFiled: January 26, 2009Publication date: August 20, 2009Applicants: FUJITSU TEN LIMITED, TOYOTA MOTOR CORPORATIONInventors: Motohide Kinoshita, Hisateru Asanuma, Jun Tsunekawa, Motomi Iyoda, Tomoya Kawasaki
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Publication number: 20090189814Abstract: A target position is estimated in such a manner to maintain target position continuity, with high accuracy, even when the X coordinate displacement of the target is large. On a scan in which the target position is not detected, when a trajectory of the target in the past is within a predetermined region in the vicinity of the Y-axis, a position for estimate is a position having an X coordinate resulting from shifting, by a first displacement, the X coordinate estimated according to the trajectory, on a basis of the X coordinate of a previous position, while when the trajectory is not within the predetermined region, the position for estimate is a position having an X coordinate resulting from shifting, by a second displacement that is larger than the first displacement, the X coordinate estimated according to the trajectory, on a basis of the X coordinate of a previous position.Type: ApplicationFiled: January 26, 2009Publication date: July 30, 2009Applicant: FUJITSU TEN LIMITEDInventors: Takumi Moriuchi, Masahiro Sakaguchi, Hisateru Asanuma, Tomoya Kawasaki, Jun Tsunekawa, Motomi Iyoda
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Patent number: 6896082Abstract: A road surface detection apparatus capable of detecting an upward/downward displacement in radar axis when detecting a road surface by projecting a radar beam. The apparatus projects a radar beam signal onto the road surface on which the radar-equipped vehicle is traveling, and receives a signal containing a reflected signal of the radar beam signal. Then, the apparatus compares the level of the road surface reflected signal contained in the received signal with a predetermined reference level and, if the result of the comparison lies outside a predefined range, then the apparatus determines that the axis defining the projection direction of the radar beam signal is displaced.Type: GrantFiled: December 21, 2001Date of Patent: May 24, 2005Assignee: Fujitsu Ten LimitedInventors: Hisateru Asanuma, Masayuki Kishida
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Patent number: 6750811Abstract: The occurrence of an axis displacement in a horizontal direction in a vehicle-to-vehicle distance controlling radar is detected, the amount of the axis displacement is determined, and an azimuth angle is corrected using the thus determined amount of the axis displacement. The frequency with which vehicle-to-vehicle distance control is released or re-set is measured and, if the frequency is higher than a threshold, it is determined that the axis is displaced. The amount of the axis displacement is determined from the angle of the locus of a stationary target. The azimuth angle of the target is corrected using the thus determined axis displacement angle.Type: GrantFiled: August 9, 2002Date of Patent: June 15, 2004Assignee: Fujitsu Ten LimitedInventors: Hisateru Asanuma, Masayuki Kishida
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Patent number: 6683559Abstract: An unwanted peak occurring due to an antenna sidelobe and an unwanted peak occurring due to a harmonic are eliminated in a radar apparatus. A peak from a target that can cause an unwanted peak is found based on the intensity of the peak, and a search is made for a peak having a predetermined positional relationship with the thus found peak. If such a peak is located, then it is determined whether the peak is a candidate for an unwanted peak, based on the difference between the intensity of the peak and the intensity of the main peak. If both of the paired peaks are determined as being candidates for unwanted peaks, it is determined that the peaks are unwanted peaks.Type: GrantFiled: November 22, 2002Date of Patent: January 27, 2004Assignee: Fujitsu Ten LimitedInventors: Sadanori Matsui, Hisateru Asanuma
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Publication number: 20030103000Abstract: An unwanted peak occurring due to an antenna sidelobe and an unwanted peak occurring due to a harmonic are eliminated in a radar apparatus. A peak from a target that can cause an unwanted peak is found based on the intensity of the peak, and a search is made for a peak having a predetermined positional relationship with the thus found peak. If such a peak is located, then it is determined whether the peak is a candidate for an unwanted peak, based on the difference between the intensity of the peak and the intensity of the main peak. If both of the paired peaks are determined as being candidates for unwanted peaks, it is determined that the peaks are unwanted peaks.Type: ApplicationFiled: November 22, 2002Publication date: June 5, 2003Applicant: Fujitsu Ten LimitedInventors: Sadanori Matsui, Hisateru Asanuma
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Publication number: 20030034913Abstract: The occurrence of an axis displacement in a horizontal direction in a vehicle-to-vehicle distance controlling radar is detected, the amount of the axis displacement is determined, and an azimuth angle is corrected using the thus determined amount of the axis displacement. The frequency with which vehicle-to-vehicle distance control is released or re-set is measured and, if the frequency is higher than a threshold, it is determined that the axis is displaced. The amount of the axis displacement is determined from the angle of the locus of a stationary target. The azimuth angle of the target is corrected using the thus determined axis displacement angle.Type: ApplicationFiled: August 9, 2002Publication date: February 20, 2003Inventors: Hisateru Asanuma, Masayuki Kishida
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Publication number: 20020189875Abstract: A road surface detection apparatus capable of detecting an upward/downward displacement in radar axis when detecting a road surface by projecting a radar beam. The apparatus projects a radar beam signal onto the road surface on which the radar-equipped vehicle is traveling, and receives a signal containing a reflected signal of the radar beam signal. Then, the apparatus compares the level of the road surface reflected signal contained in the received signal with a predetermined reference level and, if the result of the comparison lies outside a predefined range, then the apparatus determines that the axis defining the projection direction of the radar beam signal is displaced.Type: ApplicationFiled: July 19, 2002Publication date: December 19, 2002Inventors: Hisateru Asanuma, Masayuki Kishida