Mitsubishi Electric Corporation

Mitsubishi Denki Kabushiki Kaisha

Toshio Wakayama

Atsushi Okamura

Masashi Mitsumoto

Takayuki Inaba

Yoshihito Hirano

Tadashi Oshima

Toshiyuki Ando

Takashi Sekiguchi

Hiroshi Sakamaki

Shumpei Kameyama

Masayoshi Ito

Naohisa Uehara

Takahiko Fujisaka

Tomoya Matsuda

Kei Suwa

Kimio Asaka

Toshihiro Ito

Masahiro Hagio

Toshiyuki Hirai

Masashi Furuta

Ryuzaburo Usui

Satoru Murayama

Rokuzou Hara

Shohei Nakamura

Hisamichi Tanaka

Syumpei Kameyama

Kiyoyuki Hata

Takeshi Amishima

There is disclosed a radar device including: an information storage to store position information of a mobile entity existing independently of the radar device; and a transmission array antenna having a transmission sub-array antenna which transmit a signal to the mobile entity. The radar device estimates a parameter such as arrangement relation and a transmission phase of the sub-array antenna by using amplitude phase information in a plurality of reception sub-array antennas that have received reflected signals from the mobile entity with respect to the reception signals, and position information of the mobile entity that is stored in an information storage, and performs operation of radar using the estimated parameter. With this configuration, there can be obtained a radar device that is able to estimate a parameter such as arrangement relation and a transmission phase of a sub-array antenna without installing a transmission source of reference radio waves.

Antenna specification estimation device and radar device

A configuration is provided, including a determination processorthat determines, using the values TDOAand TDOAcalculated by an autocorrelation processor, whether the values TDOAcalculated by a cross-correlation processorare time differences of arrival resulting from direct waves emitted from a radio source, and a positioning processorthat calculates the location of the radio source, using the values TDOAthat are determined by the determination processoras being time differences of arrival resulting from direct waves and selected from among the values TDOAcalculated by the cross-correlation processor

Positioning device

A calibration device includes reference signal normalizing units-to-M that set, as a reference signal, a frequency domain signal being associated with either one 2 of reception antennas and being included in frequency domain signals obtained by conversions made by Fourier transform units-to-M, and divide the frequency domain signals after the conversion made by the Fourier transform units-to-M by the reference signal, thereby normalizing the frequency domain signals, and reference frequency normalizing units-to-M that normalize the frequency domain signals normalized by the reference signal normalizing units-to-M by using a signal having a reference frequency included in the frequency domain signals.

Calibration device

An observation deviceincludes a transmitter and receiver (a transmitter, a transmission/reception switch, an antenna, and a receiver) that emits a predetermined radar wave to outside the observation device, and that receives the radar wave scattered by an object existing outside the observation device and acquires a received signal, a temporary image generatorthat generates a temporary image from the received signal acquired by the transmitter and receiver, and a data transmitterthat transmits the temporary image generated by the temporary image generatorto a data processing device. The data processing deviceincludes a data receiverthat receives the temporary image transmitted by the data transmitter, and an image generatorthat generates an image from both the temporary image received by the data receiverand orbit data about a moving object.

Radar system and data processing device

A passive radar device includes: a pulse-by-pulse range compression unit executing cross-correlation processing between received signals of a direct wave and scattered wave on each of pulses divided by a direct-wave reception unit and a scattered-wave reception unit, and calculating a pulse-by-pulse range profile; a block-by-block Doppler processing unit calculating a first Doppler frequency spectrum by executing pulse-direction Fourier transform in block units each grouping plural pulses; a Doppler frequency cell-associated range migration compensation unit compensating a range-direction movement amount with respect to the first Doppler frequency spectrum on a Doppler-frequency-cell-by-Doppler-frequency-cell basis and on a block-by-block basis; and a block-direction Doppler processing unit calculating a second Doppler frequency spectrum by executing block-direction Fourier transform on an output from the Doppler frequency cell-associated range migration compensation unit.

Passive radar device

A light wave radar apparatus includes a frequency deviation detecting unitfor detecting a frequency deviation fof a light signal, and a weighted average processing unitfor determining a systematic error &#x394;Vfrom the frequency deviation fdetected by the frequency deviation detecting unit, and subtracts the systematic error &#x394;Vfrom a wind velocity Vcalculated by a Doppler signal processing unit. As a result, the light wave radar apparatus can carry out a measurement of the wind velocity Vwith a high degree of precision.

Light wave radar apparatus

A radar device separates directions of a plurality of targets, obtained from combinations of antenna beams, with a high accuracy. The radar device includes: a direction calculating unit for calculating a primary direction, which is the direction of a target, from a combination of characterizing quantities calculated by a signal detector from the reception waves of at least two beams that partially overlap, among the beams radiated in the plurality of directions; and a direction integrating unit for, when a plurality of primary directions calculated by the direction calculating unit is present, calculating an integrated direction, which is the true target direction, from an area in which distribution of the plurality of primary directions is a predetermined density or greater, based on the primary directions belonging to the area.

Radar device

To provide a radar device that is capable of performing both of long-distance detection performance and short-distance wide-angle monitor in a DBF system radar, there is provided a radar device of a digital beam forming system that radiates waves toward a space, receives a reflected wave that is reflected by an object which exists within the space, and subjects the received reflected wave to signal processing to thereby measure the object, the radar device including a transmitting antenna that radiates waves toward an observation range where required maximum distances different in respective azimuths are assumed, and has a directivity characteristic in which the transmitting gains in the respective azimuths are set on the basis of the distance attenuation characteristic at the required maximum distances.

For enabling determination on whether a sign of a Doppler frequency or a target angle is positive or negative even when only a real signal can be obtained as a received signal, the present invention provides a radar device including: an oscillator; a transmitting element; a distributor; receivers using the local wave to detect the received wave to generate a real received signal; a plurality of inter-channel phase correcting units; a spatial frequency information generating unit for converting a received signal string obtained by gathering a plurality of phase-corrected received signals into a signal in a spatial frequency domain; and a sign selecting unit for selecting a signal having a larger amplitude in a spatial frequency spectrum when two signals from a positive direction and a negative direction which are symmetrical with respect to a direction at approximately 0 degree.

Without using a traveling velocity of a vehicular object mounted with a radar device, an off-axis angle which is an offset angle between a reference direction of the radar device and a traveling direction of the vehicular object is estimated. An off-axis angle estimation method for estimating an off-axis angle (&#x3c6;) of a radar device () mounted on the vehicular object having a predetermined traveling direction includes that, from among reflection points of which a relative-velocity component (q) along the line of radar sight and an azimuthal angle (&#x3b8;) are detected by the radar device (), a plurality of reflection points of which the relative-velocity components in the traveling direction of the vehicular object being approximately equal to one another is selected without using the traveling velocity of the vehicular object; and based on the relative-velocity components along the line of radar sight, and on the azimuthal angles, of the plurality of reflection points having been selected, the off-axis angle (&#x3c6;) is autonomously calculated solely from the observed values based on radar waves.

Off-axis angle estimation method and apparatus using the same

A radar device includes: an oscillator for generating a wave at a plurality of transmission frequencies; a transmitting antenna; a receiving antenna; a receiver for generating a real received signal; a Fourier transform unit for performing a Fourier transform on the real received signal in a time direction; a spectral peak detecting unit for receiving an input of a result of the Fourier transform to extract peak complex signal values of Doppler frequency points having a maximum amplitude; a distance calculating unit for storing the peak complex signal values and for calculating a distance to a reflecting object based on the stored peak complex signal values to output the obtained distance as a measured distance value; and a distance sign determining unit for determining validity of the measured distance value and for outputting the measured distance value and the Doppler frequency according to a result of determination.

To provide a radar device which employs fast Fourier transform in a beam combining process to reduce the operation amount, the radar device including: a Fourier transform section that extracts a received signal that is obtained from waves radiated from a same transmitting element and received by a receiving element, and subjects a signal series of the extracted received signal to Fourier transform to generate a signal of a spatial frequency domain; a phase compensation section that compensates the signal of the spatial frequency domain with a phase difference that is caused by a difference between a predetermined reference position and a position of the used transmitting element; and a coherent integration section that adds the signals of the spatial frequency domain after the signals have been subjected to the phase compensation processing, which are obtained with the plurality of transmitting elements, in each of the spatial frequencies.

A laser radar apparatus includes a mixerfor converting the frequency of an electric signal outputted from a photodetectorinto a baseband frequency by using a modulating signal generated by an oscillator. The laser radar apparatus carries out a coherent integral of the electric signal whose frequency has been converted by the mixer, and measures the quality of scatterers which exist in the atmosphere from a result of the integral. As a result, even when the S/N ratio of the light signal received by a receiving optical unitis low, the laser radar apparatus can detect the quality of the scatterers.

Laser radar apparatus

A radar signal processing unit comprises a Fourier transform sectionfor executing Fourier transform of the received signal to a frequency signal, a frequency domain power calculation sectionfor calculating a power spectrum of electric power for each frequency from the frequency signal, an abnormal echo removal sectionfor determining the abnormal echo based on the power value of the power spectrum and outputting only the power spectrum not corresponding to the abnormal echo, an incoherent processing sectionfor performing incoherent integration of only the power spectrum not corresponding to the abnormal echo and averaging, and a signal detection sectionfor calculating the physical quantity of the atmosphere from the incoherent-integrated power spectrum.

Radar signal processing unit and radar signal processing method for abnormal signal extraction

A meteorological radar apparatus which calculates a shift of the pulse synchronization of a transmission pulse signal output from a transmission unit and corrects the transmission timing of the transmission pulse signal based on the shift of the pulse synchronization so that the Doppler velocity of a reference target becomes zero, thereby preventing deterioration in the measurement accuracy of the Doppler velocity caused by the shift of the pulse synchronization of the transmission pulse signal.

Growing community of inventors

Tokyo, Japan

Toshio Wakayama