Kabushiki Kaisha Toshiba

Toshiba Infrastructure Systems & Solutions Corporation

Tokyo University of Agriculture and Technology

Masakazu Wada

Fumihiko Mizutani

Hiroshi Ishizawa

Yoshirou Aoki

Hideki Marui

Shinkichi Nishimoto

Satoshi Kida

Toshihisa Tanaka

Satoshi Kon

Junichi Horikomi

Yasuhiro Katsuyama

According to one embodiment, a radar apparatus includes a signal processing device that has a first circuit, a second circuit and a transmitter. The first circuit is configured to determine whether or not there is a radio interference based on a radio signal received via an antenna. The second circuit is configured to, when the first circuit determines that there is the radio interference, select a predetermined pulse pattern based on an avoiding function of a wireless communication device having the avoiding function of the radio interference, the predetermined pulse pattern being separately defined from a pulse pattern of transmission processing for operating a radar. The transmitter is configured to transmit from the antenna a radio signal matching the pulse pattern selected by the second circuit.

Radar apparatus and method for avoiding radio interference

This invention provides a disaster prevention system capable of taking an effective measure against a flood disaster. According to one embodiment, a disaster prevention system comprises a weather prediction unit configured to calculate a predicted rainfall in a region based on rainfall information necessary for protecting the region from a flood; an analysis unit configured to determine, based on the predicted rainfall calculated by the weather prediction unit, whether a flood can occur in the region; and a control unit configured to control to close a water stop gate provided in the region to protect the region from the flood if the analysis unit determines that the flood can occur in the region.

Disaster prevention system

According to one embodiment, a radar return signal processing apparatus includes a detector, an estimation unit and an extraction unit. The detector detects an average Doppler frequency, a spectrum width, and a received power of each of echoes, from a radar return signal obtained repeatedly at regular intervals. The estimation unit estimates an optimum mixed density function by learning modeling a shaped of the frequency spectrum by calculating repeatedly a sum of density functions of each of the echoes. The extraction unit extracts information on any one of the echoes included in the radar return signal, from a parameter of the estimated mixed density function.

Radar return signal processing apparatus and method

A rectangular wave for determining a range of a weight function is transformed to frequency domain by an FFT or the like, and after being multiplied by a window function (BlackmanHarris window function, for example) generated on a frequency axis by a multiplier, the frequency domain is transformed again to the time domain by an IFFT or the like thereby to generate a weight function.

Weight function generating method, reference signal generating method, transmission signal generating apparatus, signal processing apparatus and antenna

According to one embodiment, a weather radar apparatus includes an antenna unit, a drive unit, an adjustment unit, and a control unit. The antenna unit is configured to transmit radio waves from a plurality of antenna elements, perform beam scan in a direction of elevation angle by phase control, and receive waves reflected by a weather target. The drive unit is configured to drive an elevation angle and an azimuth angle of an aperture plane of the antenna unit. The adjustment unit is configured to adjust an observation range and an observation elevation angle by the antenna unit and the drive unit in accordance with a plurality of observation modes. The control unit is configured to set the observation mode based on a received signal of the reflected waves.

Weather radar apparatus and weather observation method

According to one embodiment, a weather radar apparatus includes a transmitting/receiving unit configured to transmit a radar wave to an observation target and receive a reflected wave, a distribution unit configured to distribute a received signal of the reflected wave to a main path and at least another path, an extraction unit configured to extract, from a signal of the other path, an interference wave signal extracted from another radio station, and a removing unit configured to remove the interference wave signal extracted from a signal of the main path.

Weather radar apparatus and signal processing method thereof

According to one embodiment, a Doppler radar apparatus includes a quadrature detection unit configured to quadrature-detect a received signal of a reflected pulse from an observation target, and generate time-series data including an in-phase component and a quadrature component, an interference judgment unit configured to judge whether an interference signal is mixed into the received signal based on the time-series data, a correction unit configured to correct a vector expressed by the in-phase component and the quadrature component such that variation with respect to time of a deviation angle of the vector continues when the interference judgment unit has judged that an interference signal is mixed into the received signal, and a calculation unit configured to calculate a Doppler velocity of the observation target based on an amount of variation with respect to time of the deviation angle of corrected vector.

Doppler radar apparatus and method of calculating doppler velocity

A weather radar includes an antenna unit configured to transmit a radio wave from a plurality of antenna elements, and receive a reflected wave from a weather target by carrying out beam scanning in an elevation angle direction by phase control, a drive unit configured to control an elevation angle of an aperture of the antenna unit, and a controller configured to cause the antenna unit to carry out the beam scanning in a state where the aperture is faced to a point which presents a maximum range in the observational range by the drive unit, and direct, at a time point when the weather target is detected based on a received signal of the reflected wave, the aperture toward the weather target by the drive unit.

Weather radar and weather observation method

According to one embodiment, a dual polarization radar apparatus includes a received power calculation unit configured to calculate a horizontal polarization received power and a vertical polarization received power, the horizontal polarization received power indicating a power value of a horizontal polarization received signal reflected from an observation target, the vertical polarization received power indicating a power value of a vertical polarization received signal reflected from the observation target, a power ratio calculation unit configured to calculate a power ratio between the horizontal polarization received power and the vertical polarization received power, and an interference judgment unit configured to judge that an interference signal is mixed to the horizontal polarization received signal or the vertical polarization received signal when the power ratio is greater than a predetermined threshold value.

Dual polarization radar apparatus and interference judgment method

According to one embodiment, a weather radar apparatus includes a transmitting/receiving unit configured to simultaneously transmit radar waves of a horizontally polarized wave and a vertically polarized wave and receive reflected waves, a signal processing unit configured to perform dual polarization observation based on a reception output from the transmitting/receiving unit and calculate a received power of each polarized wave, an observation parameter calculation unit configured to calculate, based on the received powers, a first observation parameter having a first spatial resolution, and a second observation parameter having higher correlation with a rainfall rate than that of the first observation parameter and a second spatial resolution lower than the first spatial resolution, and a rainfall rate calculation unit configured to synthetically determine the rainfall rate based on the first observation parameter and the second observation parameter.

Weather radar apparatus and rainfall rate calculation method

A weather radar includes an antenna unit of an active phased array system in which a plurality of antenna elements configured to transmit a radar pulse and receive a reflected pulse are arranged in a vertical direction, a transmission beam formation unit configured to divide an observation range in the elevation angle direction into a plurality of observation elevation angles, subdivide each observation elevation angle into a plurality of regions, assign a set of a plurality of regions not adjacent to each other to a pulse repetition interval (PRI), and form a fan-shaped transmission beam in the elevation angle direction for each of the regions in the set, and a reception beam formation unit configured to form a plurality pencil-shaped reception beams for each of the plurality of regions.

A weather prediction unit calculates a local numerical weather prediction model from GPV data and weather observation data and predicts a regional meteorological phenomenon in a fractionated region. A power demand prediction unit predicts a power demand in each region on the basis of the regional prediction result of the meteorological phenomenon. A generated heat value prediction unit predicts a generated heat value in each region on the basis of the regional prediction result of the power demand. The regional prediction result of the generated heat value is reflected on the numerical weather prediction model. Meteorological phenomena are predicted by adding the thermal energy as sensible heat from the earth's surface and taking artificial exhaust heat by electrical energy into consideration. Accordingly, weather prediction and power demand prediction are organically combined so that accurate weather prediction and power demand prediction are implemented while considering artificial heat exhaust.

Weather prediction system and power demand prediction system, and weather prediction method and power demand prediction method

An antenna section radiates a pulse beam and receives its reflected wave, and a signal processing section observes a rain or cloud occurring region within a covered area based on a signal intensity of the reflected wave. In this case, to obtain wind direction and velocity information for the rain or cloud occurring region, the signal processing section observes Rayleigh scattering-induced Doppler echo components in that region to calculate the wind direction and velocity from a result of the observation. To obtain the wind direction and velocity information for a region other than the rain or cloud occurring area, the beam formed by the antenna section is directed toward the region to be observed so that the signal processing section can observe Bragg scattering-induced echo components based on a received signal of the reflected wave to calculate the wind direction and velocity from a result of the observation.

Growing community of inventors

Kawasaki, Japan

Masakazu Wada