Patents by Inventor Koji Dai
Koji Dai 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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Patent number: 10379202Abstract: Provided is a radar apparatus capable of suitably transmitting a transmission signal according to a target object existing around the radar apparatus, and suitably displaying one of the target object therearound, a response signal of a radar beacon etc. The radar apparatus includes a determiner configured to determine one of a target object and an area, an angular range setter configured to set an angular range centering on the position of the radar apparatus to include the one of the target object and the area determined by the determiner, and a transmission signal controller configured to change a waveform of the transmission signal to be different between a direction within the angular range and a direction outside the angular range.Type: GrantFiled: May 19, 2015Date of Patent: August 13, 2019Assignee: Furuno Electric Co., Ltd.Inventors: Jun Yamabayashi, Koji Dai, Tatsuya Kojima
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Patent number: 10048363Abstract: A radar device comprises a transmitter, a receiver, a first radar image production component, a second radar image production component, a display component, and an echo width adjuster. The transmitter transmits a pulse signal. The receiver receives an echo signal during a transmission and reception period of the pulse signal. The first radar image production component produces a radar image of a first display range on the basis of the echo signal. The second radar image production component produces a radar image of a second display range that is wider than the first display range on the basis of the echo signal. The display component selectively or simultaneously displays the radar image of the first display range and the radar image of the second display range. The echo width adjuster adjusts pulse width of echo included in the radar images or the echo signal according to the display range of the radar image.Type: GrantFiled: November 5, 2013Date of Patent: August 14, 2018Assignee: FURUNO ELECTRIC COMPANY LIMITEDInventor: Koji Dai
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Publication number: 20170322297Abstract: A radar device comprises a transmitter, a receiver, a first radar image production component, a second radar image production component, a display component, and an echo width adjuster. The transmitter transmits a pulse signal. The receiver receives an echo signal during a transmission and reception period of the pulse signal. The first radar image production component produces a radar image of a first display range on the basis of the echo signal. The second radar image production component produces a radar image of a second display range that is wider than the first display range on the basis of the echo signal. The display component selectively or simultaneously displays the radar image of the first display range and the radar image of the second display range. The echo width adjuster adjusts pulse width of echo included in the radar images or the echo signal according to the display range of the radar image.Type: ApplicationFiled: November 5, 2013Publication date: November 9, 2017Applicant: FURONO ELECTRIC CO., LTD.Inventor: Koji Dai
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Patent number: 9689979Abstract: A radar apparatus using a pulse pair method to quickly measure a relative speed of an object. The radar apparatus includes: A data acquirer that acquires data relating to a pulse width, a repetition frequency, and a highest staggered ratio; A staggered pattern output unit that outputs a specific staggered pattern in which a total of phase changes within a sweep range of the target of the pulse pairing can be approximated to zero, wherein each phase change is caused by the pulse pairing on a target object at a constant speed due to a difference between an average transmission interval and a transmission interval between transmissions within the sweep range; And a setter that sets the transmission interval of a pulse signal by using the pulse width, the repetition frequency, the highest staggered ratio, and the specific staggered pattern.Type: GrantFiled: April 1, 2013Date of Patent: June 27, 2017Assignee: Furuno Electric Co., Ltd.Inventors: Koji Dai, Akira Okunishi
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Publication number: 20170123050Abstract: Provided is a radar apparatus capable of suitably transmitting a transmission signal according to a target object existing around the radar apparatus, and suitably displaying one of the target object therearound, a response signal of a radar beacon etc. The radar apparatus includes a determiner configured to determine one of a target object and an area, an angular range setter configured to set an angular range centering on the position of the radar apparatus to include the one of the target object and the area determined by the determiner, and a transmission signal controller configured to change a waveform of the transmission signal to be different between a direction within the angular range and a direction outside the angular range.Type: ApplicationFiled: May 19, 2015Publication date: May 4, 2017Inventors: Jun YAMABAYASHI, Koji DAI, Tatsuya KOJIMA
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Patent number: 9354303Abstract: A signal processing device is provided. The device includes an echo signal input unit for receiving echo signals resulted from transmission signals reflected on an object. The transmission signals are transmitted from a transmission source at transmission timings at predetermined time intervals, at least one of the transmission timings shifted from the other timings in time. The device includes a complex reception signal generator for generating complex reception signals, a phase calculator for calculating a phase change amount of the complex reception signals with respect to a reference phase, a phase corrector for phase-correcting the complex reception signals and outputting the corrected signals, and a Doppler processor for performing Doppler processing on the corrected signals and outputting the Doppler-processed signals as Doppler echo signals of the object.Type: GrantFiled: August 30, 2013Date of Patent: May 31, 2016Assignee: Furuno Electric Co., Ltd.Inventors: Yasunobu Asada, Akira Okunishi, Koji Dai, Sae Takemoto
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Patent number: 9234961Abstract: A radar device is provided, which includes a receiver for transmitting a pulse-shaped radio wave and receiving a corresponding reflection signal as a reception signal, a Doppler processor for generating Doppler processed signals that are signals obtained by separating the reception signal according to Doppler frequencies or signals obtained based on the signals separated, an improvement level calculator for calculating a signal improvement level by comparing an amplitude value of the reception signal with amplitude values of the Doppler processed signals, a signal synthesizer for synthesizing the reception signal and the Doppler processed signals based on the signal improvement levels, and a display processor for generating a radar image based on the synthesized signal.Type: GrantFiled: June 19, 2013Date of Patent: January 12, 2016Assignee: Furuno Electric Co., Ltd.Inventors: Koji Dai, Tatsuya Kojima
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Publication number: 20150130654Abstract: A radar apparatus using a pulse pair method to quickly measure a relative speed of an object. The radar apparatus includes: A data acquirer that acquires data relating to a pulse width, a repetition frequency, and a highest staggered ratio; A staggered pattern output unit that outputs a specific staggered pattern in which a total of phase changes within a sweep range of the target of the pulse pairing can be approximated to zero, wherein each phase change is caused by the pulse pairing on a target object at a constant speed due to a difference between an average transmission interval and a transmission interval between transmissions within the sweep range; And a setter that sets the transmission interval of a pulse signal by using the pulse width, the repetition frequency, the highest staggered ratio, and the specific staggered pattern.Type: ApplicationFiled: April 1, 2013Publication date: May 14, 2015Inventors: Koji Dai, Akira Okunishi
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Publication number: 20140062760Abstract: A signal processing device is provided. The device includes an echo signal input unit for receiving echo signals resulted from transmission signals reflected on an object. The transmission signals are transmitted from a transmission source at transmission timings at predetermined time intervals, at least one of the transmission timings shifted from the other timings in time. The device includes a complex reception signal generator for generating complex reception signals, a phase calculator for calculating a phase change amount of the complex reception signals with respect to a reference phase, a phase corrector for phase-correcting the complex reception signals and outputting the corrected signals, and a Doppler processor for performing Doppler processing on the corrected signals and outputting the Doppler-processed signals as Doppler echo signals of the object.Type: ApplicationFiled: August 30, 2013Publication date: March 6, 2014Applicant: Furuno Electric Co., Ltd.Inventors: Yasunobu Asada, Akira Okunishi, Koji Dai, Sae Takemoto
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Patent number: 8665135Abstract: A radar device is disclosed, which includes an antenna for transmitting an electromagnetic wave and receiving an echo signal from a target object while rotating in a horizontal plane, a display module for displaying the target object so as to correspond the echo signal to a position of the target object with respect to the antenna, a speed calculation module for calculating a relative velocity of the antenna and the target object, and a risk level detection module for detecting a risk level of the target object based on the relative velocity of the target object calculated by the speed calculation module. The speed calculation module calculates the relative velocity of the target object based on a change in phases of at least two of the echo signals received at a different time. The display module controls a display mode of the target object based on the risk level.Type: GrantFiled: May 12, 2010Date of Patent: March 4, 2014Assignee: Furuno Electric Company LimitedInventor: Koji Dai
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Publication number: 20130342386Abstract: A radar device is provided, which includes a receiver for transmitting a pulse-shaped radio wave and receiving a corresponding reflection signal as a reception signal, a Doppler processor for generating Doppler processed signals that are signals obtained by separating the reception signal according to Doppler frequencies or signals obtained based on the signals separated, an improvement level calculator for calculating a signal improvement level by comparing an amplitude value of the reception signal with amplitude values of the Doppler processed signals, a signal synthesizer for synthesizing the reception signal and the Doppler processed signals based on the signal improvement levels, and a display processor for generating a radar image based on the synthesized signal.Type: ApplicationFiled: June 19, 2013Publication date: December 26, 2013Inventors: Koji Dai, Tatsuya Kojima
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Patent number: 8509684Abstract: A microwave frequency converter for a radar receiver is provided in which a frequency of a local oscillator of the microwave frequency converter can be prevented from interfering with an oscillation frequency of a magnetron included in the radar receiver and which can receive a signal from a considerably short distance. A voltage of an RF amplifier connected to the microwave frequency converter is synchronized with an oscillation output of the magnetron. The gate and drain voltages of a FET used in the RF amplifier are simultaneously switched OFF only during times before and after the magnetron performs oscillation, thereby switching an amplification function of the FET to an attenuation function thereof to increase a switching loss of the microwave frequency converter.Type: GrantFiled: December 20, 2004Date of Patent: August 13, 2013Assignee: Furuno Electric Company LimitedInventors: Akio Funae, Koji Dai, Hideki Torizuka
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Patent number: 7956798Abstract: A radar apparatus having an integral ARPA function transmits at least two kinds of pulse signals, each of which has different pulselength, according to a specific transmission pattern and receives echoes of the transmitted pulse signal. The radar apparatus includes an echo data generator for generating display echo data for each range scale selected for on-screen presentation by using an echo signal obtained with each transmission pulselength, an ARPA processor for generating a single set of motion-related information on each tracked target to be superimposed on the display echo data by using echo signals obtained with the different pulselengths, a display output synthesizer for superimposing the motion-related information on each tracked target generated by the ARPA processor on the display echo data, and a display unit for displaying a superimposed picture produced by the display output synthesizer.Type: GrantFiled: June 12, 2007Date of Patent: June 7, 2011Assignee: Furuno Electric Company, LtdInventors: Katsuyuki Yanagi, Koji Dai, Sae Takemoto
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Publication number: 20100289690Abstract: A radar device is disclosed, which includes an antenna for transmitting an electromagnetic wave and receiving an echo signal from a target object while rotating in a horizontal plane, a display module for displaying the target object so as to correspond the echo signal to a position of the target object with respect to the antenna, a speed calculation module for calculating a relative velocity of the antenna and the target object, and a risk level detection module for detecting a risk level of the target object based on the relative velocity of the target object calculated by the speed calculation module. The speed calculation module calculates the relative velocity of the target object based on a change in phases of at least two of the echo signals received at a different time. The display module controls a display mode of the target object based on the risk level.Type: ApplicationFiled: May 12, 2010Publication date: November 18, 2010Applicant: FURUNO Electric Company LimitedInventor: Koji DAI
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Patent number: 7746270Abstract: A radar apparatus transmits a pulse signal including pulses having at least two different pulselengths in a specific transmit pulse pattern and receives a returning echo signal through a single antenna. A tuning voltage setting timing generator generates a timing of setting a tuning voltage according to a combination of transmission pulselengths and a tuning processor performs tuning operation in a manner suited to a current transmission pulselength based on the tuning voltage setting timing. The radar apparatus may include a tuning voltage alteration decider for deciding whether or not to alter the tuning voltage based on a combination of alternate pulselengths before altering the pulselength of the pulse signal generated by a transmitter and the tuning processor alters the tuning voltage based on the result of decision made by the tuning voltage alteration decider.Type: GrantFiled: April 25, 2007Date of Patent: June 29, 2010Assignee: Furuno Electric Company LimitedInventors: Masahiro Nakahama, Sae Takemoto, Koji Dai
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Patent number: 7583224Abstract: The portion corresponding to a main bang signal leaking from a transmission/reception switching unit is extracted as a frequency estimation signal from an IF signal from a mixer in a signal extracting unit, a frequency is estimated in a frequency estimating unit, and the frequency of a local oscillation signal of a local oscillator is controlled so that the frequency of the IF signal is equal to a target value. The frequency estimation in the frequency estimating unit is carried out by using Discrete Fourier Transform or Fast Fourier Transform.Type: GrantFiled: June 12, 2007Date of Patent: September 1, 2009Assignee: Furuno Electric Co., Ltd.Inventors: Masahiro Nakahama, Yoshihiro Ishii, Katsuyuki Yanagi, Koji Dai
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Publication number: 20080122684Abstract: The portion corresponding to a main bang signal leaking from a transmission/reception switching unit is extracted as a frequency estimation signal from an IF signal from a mixer in a signal extracting unit, a frequency is estimated in a frequency estimating unit, and the frequency of a local oscillation signal of a local oscillator is controlled so that the frequency of the IF signal is equal to a target value. The frequency estimation in the frequency estimating unit is carried out by using Discrete Fourier Transform or Fast Fourier Transform.Type: ApplicationFiled: June 12, 2007Publication date: May 29, 2008Inventors: Masahiro Nakahama, Yoshihiro Ishii, Katsuyuki Yanagi, Koji Dai
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Publication number: 20080100503Abstract: A radar apparatus having an integral ARPA function transmits at least two kinds of pulse signals, each of which has different pulselength, according to a specific transmission pattern and receives echoes of the transmitted pulse signal. The radar apparatus includes an echo data generator for generating display echo data for each range scale selected for on-screen presentation by using an echo signal obtained with each transmission pulselength, an ARPA processor for generating a single set of motion-related information on each tracked target to be superimposed on the display echo data by using echo signals obtained with the different pulselengths, a display output synthesizer for superimposing the motion-related information on each tracked target generated by the ARPA processor on the display echo data, and a display unit for displaying a superimposed picture produced by the display output synthesizer.Type: ApplicationFiled: June 12, 2007Publication date: May 1, 2008Applicant: Furuno Electric Company LimitedInventors: Katsuyuki Yanagi, Koji Dai, Sae Takemoto
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Publication number: 20070252751Abstract: A radar apparatus transmits a pulse signal including pulses having at least two different pulselengths in a specific transmit pulse pattern and receives a returning echo signal through a single antenna. A tuning voltage setting timing generator generates a timing of setting a tuning voltage according to a combination of transmission pulselengths and a tuning processor performs tuning operation in a manner suited to a current transmission pulselength based on the tuning voltage setting timing. The radar apparatus may include a tuning voltage alteration decider for deciding whether or not to alter the tuning voltage based on a combination of alternate pulselengths before altering the pulselength of the pulse signal generated by a transmitter and the tuning processor alters the tuning voltage based on the result of decision made by the tuning voltage alteration decider.Type: ApplicationFiled: April 25, 2007Publication date: November 1, 2007Applicant: Furuno Electric Company LimitedInventors: Masahiro Nakahama, Sae Takemoto, Koji Dai
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Publication number: 20070210954Abstract: A microwave frequency converter for a radar receiver is provided in which a frequency of a local oscillator of the microwave frequency converter can be prevented from interfering with an oscillation frequency of a magnetron included in the radar receiver and which can receive a signal from a considerably short distance. A voltage of an RF amplifier connected to the microwave frequency converter is synchronized with an oscillation output of the magnetron. The gate and drain voltages of a FET used in the RF amplifier are simultaneously switched OFF only during times before and after the magnetron performs oscillation, thereby switching an amplification function of the FET to an attenuation function thereof to increase a switching loss of the microwave frequency converter.Type: ApplicationFiled: December 20, 2004Publication date: September 13, 2007Applicant: Furuno Electric Company, LimitedInventors: Akio Funae, Koji Dai, Hideki Torizuka