Patents by Inventor Motoi Nakanishi
Motoi Nakanishi 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: 6753805Abstract: In an FM-CW radar system, regarding peaks appearing in the frequency spectrum of a beat signal in an FM-CW radar, groups of consecutive peaks in beam bearings within a predetermined frequency difference are regarded as being caused by reflected waves from a single target, and based on a combination of a peak group in an up-modulating interval and a peak group in a down-modulating interval, a relative distance to a target and its relative speed are determined.Type: GrantFiled: December 6, 2002Date of Patent: June 22, 2004Assignee: Murata Manufacturing Co., Ltd.Inventors: Motoi Nakanishi, Toru Ishii, Tetsu Nishimura
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Patent number: 6707416Abstract: A radar system is capable of transmitting necessary information through a very small amount of data from a radar device to a host device via a bus with a limited bandwidth. A radar sensor generates a beat signal between a transmission signal and a reflected signal from a target. A signal processor determines a spectrum of the beat signal and compresses the data indicating the spectrum. The resultant compressed data is transmitted to the host device via a bus. The host device decompresses the received data thereby reproducing the spectrum data. The host device then detects the target on the basis of the reproduced spectrum data.Type: GrantFiled: February 7, 2003Date of Patent: March 16, 2004Assignee: Murata Manufacturing Co., Ltd.Inventors: Toru Ishii, Tetsu Nishimura, Motoi Nakanishi
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Patent number: 6686870Abstract: A radar device precisely detects a target in short time intervals by detecting a true peak frequency with high accuracy via a calculation which does not require a large amount of computation. A discrete frequency spectrum of a beat signal multiplied by a window function is determined, and values of signal strength at two discrete frequencies which are, respectively, higher and lower than a peak frequency of the discrete frequency spectrum of the beat signal and which are adjacent to the peak frequency. The frequency difference between the discrete peak frequency of the beat signal and the peak frequency of the window function is then determined from the ratio between the values of signal strength at those two discrete frequencies adjacent to the peak frequency. Thus, the true peak frequency of the beat signal is determined with a high frequency resolution.Type: GrantFiled: February 3, 2003Date of Patent: February 3, 2004Assignee: Murata Manufacturing Co., Ltd.Inventors: Tetsu Nishimura, Motoi Nakanishi, Toru Ishii
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Patent number: 6674395Abstract: A radar system includes a transmitting/receiving unit, having a voltage controlled oscillator, for repeatedly transmitting a triangular transmission signal including a frequency-gradually-rising up-modulation interval and a frequency-gradually-dropping down-modulation interval and for receiving a reception signal including a reflected signal from a target, a frequency analysis unit, a data storing unit for storing time-varying characteristics of input values to a D/A converter that monotonically change an oscillation frequency of the voltage controlled oscillator with time, in the form of data concerning an expression representing the time-varying characteristics, and a data processing unit for determining the input values to the D/A converter with reference to the data. At least one of the relative distance to the target and the relative speed of the target is detected based on a beat signal during the up-modulation interval and the beat signal during the down-modulation interval.Type: GrantFiled: January 17, 2003Date of Patent: January 6, 2004Assignee: Murata Manufacturing Co., Ltd.Inventors: Motoi Nakanishi, Toru Ishii, Tetsu Nishimura
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Publication number: 20030184470Abstract: A radar system achieves adjustment of a time-change characteristic of a frequency-modulating voltage signal to a voltage-controlled oscillator for determining a transmitting signal such that the time-change characteristic of the frequency-modulating voltage signal is changed by a minute amount and the frequency spectrum of a beat signal is determined. The adjustment is performed so that the shape of a bulge in signal intensity included in the frequency spectrum is the sharpest.Type: ApplicationFiled: March 17, 2003Publication date: October 2, 2003Applicant: Murata Manufacturing Co., Ltd.Inventors: Toru Ishii, Motoi Nakanishi, Tetsu Nishimura
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Publication number: 20030156054Abstract: A radar system is capable of transmitting necessary information through a very small amount of data from a radar device to a host device via a bus with a limited bandwidth. A radar sensor generates a beat signal between a transmission signal and a reflected signal from a target. A signal processor determines a spectrum of the beat signal and compresses the data indicating the spectrum. The resultant compressed data is transmitted to the host device via a bus. The host device decompresses the received data thereby reproducing the spectrum data. The host device then detects the target on the basis of the reproduced spectrum data.Type: ApplicationFiled: February 7, 2003Publication date: August 21, 2003Applicant: Murata Manufacturing Co., Ltd.Inventors: Toru Ishii, Tetsu Nishimura, Motoi Nakanishi
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Publication number: 20030151544Abstract: A radar device precisely detects a target in short time intervals by detecting a true peak frequency with high accuracy via a calculation which does not require a large amount of computation. A discrete frequency spectrum of a beat signal multiplied by a window function is determined, and values of signal strength at two discrete frequencies which are, respectively, higher and lower than a peak frequency of the discrete frequency spectrum of the beat signal and which are adjacent to the peak frequency. The frequency difference between the discrete peak frequency of the beat signal and the peak frequency of the window function is then determined from the ratio between the values of signal strength at those two discrete frequencies adjacent to the peak frequency. Thus, the true peak frequency of the beat signal is determined with a high frequency resolution.Type: ApplicationFiled: February 3, 2003Publication date: August 14, 2003Applicant: Murata Manufacturing Co., Ltd.Inventors: Tetsu Nishimura, Motoi Nakanishi, Toru Ishii
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Publication number: 20030151543Abstract: A radar system includes a transmitting/receiving unit, having a voltage controlled oscillator, for repeatedly transmitting a triangular transmission signal including a frequency-gradually-rising up-modulation interval and a frequency-gradually-dropping down-modulation interval and for receiving a reception signal including a reflected signal from a target, a frequency analysis unit, a data storing unit for storing time-varying characteristics of input values to a D/A converter that monotonically change an oscillation frequency of the voltage controlled oscillator with time, in the form of data concerning an expression representing the time-varying characteristics, and a data processing unit for determining the input values to the D/A converter with reference to the data. At least one of the relative distance to the target and the relative speed of the target is detected based on a beat signal during the up-modulation interval and the beat signal during the down-modulation interval.Type: ApplicationFiled: January 17, 2003Publication date: August 14, 2003Applicant: Murata Manufacturing Co., Ltd.Inventors: Motoi Nakanishi, Toru Ishii, Tetsu Nishimura
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Patent number: 6597307Abstract: By changing the direction of a detection radio-wave beam within a detection-angle range and by detecting reflected-signal intensities, wherein each of the reflected-signal intensities is detected for each predetermined unit angle, moving averages of the reflected-signal intensities are calculated by using an angular width predetermined for a given distance as an average width. Thus, data of a reflected-signal-intensity distribution is obtained. Accordingly, the direction of a target is detected by finding the direction of the highest reflected-signal intensity.Type: GrantFiled: February 4, 2002Date of Patent: July 22, 2003Assignee: Murata Manufacturing Co. Ltd.Inventors: Motoi Nakanishi, Toru Ishii, Ikuo Takakuwa, Tetsu Nishimura
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Publication number: 20030128154Abstract: A radar performs accurate and appropriate pairing even if peaks of approximately identical signal intensities or even if a plurality of peak groups having identical representative beam bearings exist in the frequency spectrum. First, the peak frequency of a peak which appears in the frequency spectrum is determined for each of an up-modulating interval and a down-modulating interval in predetermined beam bearings, and signal-intensity profiles in the beam bearings are extracted with regard to a plurality of beam portions which are adjacent to the beam bearings. Next, the correlation level between the signal-intensity profiles at the up-modulating interval and the down-modulating interval is determined, and pairing is performed in sequence starting from the profiles having a higher correlation level.Type: ApplicationFiled: January 2, 2003Publication date: July 10, 2003Applicant: Murata Manufacturing Co., Ltd.Inventors: Motoi Nakanishi, Toru Ishii, Tetsu Nishimura
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Publication number: 20030117312Abstract: In an FM-CW radar system, regarding peaks appearing in the frequency spectrum of a beat signal in an FM-CW radar, groups of consecutive peaks in beam bearings within a predetermined frequency difference are regarded as being caused by reflected waves from a single target, and based on a combination of a peak group in an up-modulating interval and a peak group in a down-modulating interval, a relative distance to a target and its relative speed are determined.Type: ApplicationFiled: December 6, 2002Publication date: June 26, 2003Applicant: Murata Manufacturing Co., Ltd.Inventors: Motoi Nakanishi, Toru Ishii, Tetsu Nishimura
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Publication number: 20030102998Abstract: A radar system and a characteristic adjustment method for the radar system are provided, in which a control voltage waveform of a voltage controlled oscillator for frequency-modulating a sending signal can be set in a short time without increasing the required amount of memory. In adjusting time-varying characteristics of a voltage signal for frequency modulation on a voltage controlled oscillator determining a sending frequency, the time-varying characteristics of the voltage signal for frequency modulation are adjusted to optimize a form of a protrusion in signal intensity included in a frequency spectrum of a beat signal.Type: ApplicationFiled: November 21, 2002Publication date: June 5, 2003Inventors: Toru Ishii, Motoi Nakanishi, Tetsu Nishimura
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Publication number: 20020190895Abstract: By changing the direction of a detection radio-wave beam within a detection-angle range and by detecting reflected-signal intensities, wherein each of the reflected-signal intensities is detected for each predetermined unit angle, moving averages of the reflected-signal intensities are calculated by using an angular width predetermined for a given distance as an average width. Thus, data of a reflected-signal-intensity distribution is obtained. Accordingly, the direction of a target is detected by finding the direction of the highest reflected-signal intensity.Type: ApplicationFiled: February 4, 2002Publication date: December 19, 2002Applicant: Murata Manufacturing Co., Ltd.Inventors: Motoi Nakanishi, Toru Ishii, Ikuo Takakuwa, Tetsu Nishimura
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Publication number: 20020180633Abstract: In a radar, a coupler extracts a part of a transmission signal as a local signal and a mixer mixes a reception signal from a circulator and the local signal so as to output an intermediate frequency signal which is the frequency difference between the transmission signal and the reception signal. An IF-amplifying circuit amplifies the intermediate frequency signal and an AD converter converts the signal to digital data. A DC-removing unit removes a DC component by subtracting the average from the data and an FFT operation unit performs fast Fourier transform so that the distance to a target and the relative velocity of the target are calculated based on a peak included in the frequency spectrum.Type: ApplicationFiled: May 29, 2002Publication date: December 5, 2002Applicant: Murata Manufacturing Co., Ltd.Inventors: Motoi Nakanishi, Toru Ishii, Tetsu Nishimura
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Patent number: 6061550Abstract: In a radio transmitter, an amplifier, a resonator and an antenna together form an oscillation loop. The oscillating energy of the oscillation loop is efficiently emitted from the antenna as a radio wave. Most of the oscillation power of the oscillation loop is supplied to the radiation resistance of the antenna because the transmitter has no components outside the loop which may consume the oscillation power.Type: GrantFiled: October 2, 1996Date of Patent: May 9, 2000Assignee: Murata Manufacturing Co., Ltd.Inventors: Hiroaki Tanaka, Motoi Nakanishi