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公开(公告)号：US12140667B2
公开(公告)日：2024-11-12
申请号：US18230885
申请日：2023-08-07
Inventor： Takaaki Kishigami , Kenta Iwasa , Hidekuni Yomo
IPC: G01S13/93 , G01S7/02 , G01S7/03 , G01S13/53 , G01S13/534 , G01S13/931
Abstract: A radar apparatus includes a plurality of transmit antennas that transmits a plurality of transmission signals using a multiplexing transmission, and a transmission circuit that applies phase rotation amounts corresponding to combinations of Doppler shift amounts and code sequences to the plurality of transmission signals. Each of the plurality of transmission signals is assigned a different combination among the combinations. The combinations include at least two combinations of a same number of multiplexing by the code sequences.
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公开(公告)号：US11940524B2
公开(公告)日：2024-03-26
申请号：US17952824
申请日：2022-09-26
Inventor： Takaaki Kishigami , Ryosuke Shiozaki , Hidekuni Yomo , Kenta Iwasa
CPC classification number: G01S13/343 , G01S7/4026 , G01S7/403 , G01S7/4034 , G01S2013/0245
Abstract: A radar device includes radar transmission and receiving circuits. The radar transmission circuit transmits one or more transmission signals, each having a transmission period Tr. The radar receiving circuit receives one or more reflected signals in which the transmission signals are reflected by an object and estimates a direction of the object based on the reflected signals. The radar transmission circuit includes Nt transmission antennas. A control circuit sets a transmission gap period between a first and second periods, with the transmission gap period being a period during which the transmission signals are not transmitted. The first period is equal to an integral multiple of a period Np, the period Np is equal to or more than Nt times the transmission period Tr, and the second period is set after the first period and is equal to an integral multiple of the period Np.
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公开(公告)号：US11933875B2
公开(公告)日：2024-03-19
申请号：US17202941
申请日：2021-03-16
Inventor： Takaaki Kishigami , Kenta Iwasa
IPC: G01S13/28 , G01S7/02 , G01S7/282 , G01S7/288 , G01S13/931 , H04B7/0413
CPC classification number: G01S13/288 , G01S7/0234 , G01S7/282 , G01S7/2883 , G01S13/282 , G01S13/931 , H04B7/0413
Abstract: The target detection accuracy of a radar apparatus is improved. The radar apparatus includes transmission circuitry, which, in operation, transmits a transmission signal using a plurality of transmit antennas, and reception circuitry, which, in operation, receives using a plurality of receive antennas a reflected wave signal that is the transmission signal reflected by an object, in which the plurality of transmit antennas include at least one first transmit antenna and a plurality of second transmit antennas, and, in a first direction, an absolute value of a difference between, on one hand, a spacing between the at least one first transmit antenna and a phase center of those of the plurality of second transmit antennas which are used for beam synthesis, and, on another hand, a spacing between adjacent receive antennas of the plurality of receive antennas is a defined value based on a wavelength of the plurality of transmission signals.
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公开(公告)号：US11762088B2
公开(公告)日：2023-09-19
申请号：US17870383
申请日：2022-07-21
Inventor： Takaaki Kishigami , Kenta Iwasa , Hidekuni Yomo
IPC: G01S13/93 , G01S7/03 , G01S13/53 , G01S7/02 , G01S13/931 , G01S13/534
CPC classification number: G01S13/931 , G01S7/036 , G01S13/534 , G01S7/023
Abstract: A radar apparatus includes a plurality of transmit antennas that transmits a plurality of transmission signals using a multiplexing transmission, and a transmission circuit that applies phase rotation amounts corresponding to combinations of Doppler shift amounts and code sequences to the plurality of transmission signals. Each of the plurality of transmission signals is assigned a different combination among the combinations. The combinations include at least one combination of different numbers of multiplexing by the code sequences.
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公开(公告)号：US10379209B2
公开(公告)日：2019-08-13
申请号：US14846680
申请日：2015-09-04
Inventor： Takaaki Kishigami , Tadashi Morita , Kiyotaka Kobayashi
Abstract: A radar device includes: a transmission beam controller that selects, every first period, a transmission beam set used for transmission of a radar signal from among a plurality of transmission beam sets each including at least two transmission beam directions; and a radar transmitter that transmits the radar signal in a predetermined transmission period by using the selected transmission beam set, wherein the transmission beam controller switching, every second period within the first period, among the at least two transmission beam directions included in the transmission beam set.
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Patent Agency Ranking
公开(公告)号：US10267907B2
公开(公告)日：2019-04-23
申请号：US14958750
申请日：2015-12-03
Inventor： Maiko Shikatani , Hirofumi Nishimura , Asako Hamada , Takaaki Kishigami
Abstract: A radar apparatus is mountable on a vehicle, transmits a radar signal, and includes a radio receiver that receives reflected wave signals being the radar signal reflected by multiple objects present in the viewing angle of the radar apparatus via a receiving antenna mountable on a side of the vehicle, a signal processing unit that determines the azimuths of the objects, the Doppler speeds between the radar apparatus and the objects, and the intensities of the reflected wave signals by using the reflected wave signals, and a radar state estimation unit that estimates the speed and traveling direction of the radar using the azimuths of the objects, the Doppler speeds, and the intensities.
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公开(公告)号：US10222471B2
公开(公告)日：2019-03-05
申请号：US15063270
申请日：2016-03-07
Inventor： Yunyun Cao , Hirofumi Nishimura , Takaaki Kishigami , Asako Hamada
Abstract: A vehicle movement estimation device has a radar that is provided in a vehicle and that performs transmission of a radar wave and reception of a reflected wave that is the radar wave reflected by an object, a radar movement estimator that estimates a radar movement velocity and a radar movement direction of the radar based on the received reflected wave, an angular velocity estimator that estimates a rotational angular velocity of the vehicle, and a vehicle movement estimator that estimates a movement velocity and a movement direction of a prescribed position of the vehicle based on the estimated radar movement velocity and radar movement direction, the estimated rotational angular velocity, and a spatial relationship between the radar and the prescribed position.
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公开(公告)号：US09610946B2
公开(公告)日：2017-04-04
申请号：US14878244
申请日：2015-10-08
Inventor： Hirofumi Nishimura , Asako Hamada , Maiko Shikatani , Takaaki Kishigami
CPC classification number: B60W30/09 , B60W2550/10 , G01S7/411 , G01S7/415 , G01S13/726 , G01S13/931 , G01S2013/9353
Abstract: A vehicle travel assistance apparatus includes a transceiver that transmits radio waves and receives reflected waves, a detector that detects a forward vehicle traveling ahead of a vehicle and a pedestrian based on intensities of the reflected waves, and a controller that, in a case the detector detects a stop state of the forward vehicle, a stop state of the vehicle and a presence of the pedestrian during the forward vehicle following, continues a stationary state of the vehicle.
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公开(公告)号：US12000921B2
公开(公告)日：2024-06-04
申请号：US17204274
申请日：2021-03-17
Inventor： Takaaki Kishigami
CPC classification number: G01S13/347 , G01S7/352 , G01S7/356 , G01S13/325
Abstract: The target detection accuracy of a radar apparatus is improved. The radar apparatus includes signal generation circuitry, which, in operation, generates a first transmission signal and a second transmission signal, and transmission circuitry, which, in operation, transmits a multiplexed signal resulting from code-multiplexing the first transmission signal and the second transmission signal, wherein a modulation frequency of the first transmission signal at a first timing is identical to a modulation frequency of the second transmission signal at a second timing that is later than the first timing.
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公开(公告)号：US11670866B2
公开(公告)日：2023-06-06
申请号：US17184126
申请日：2021-02-24
Inventor： Takaaki Kishigami
CPC classification number: H01Q21/0025 , G01S7/032 , G01S13/284 , G01S13/42 , H01Q21/061
Abstract: A transmitting array antenna includes a second antenna group placed in a position inside a first antenna group in a first direction and a position different from the first antenna group in a second direction. A receiving array antenna includes a fourth antenna placed in a position outside a third antenna group arranged in the first direction and a position different from the third antenna group in the second direction. An interelement spacing between a receiving antenna of the third antenna group located at an end on a second side is identical to an interelement spacing in the first direction between a transmitting antenna of the first antenna group on the first side and each of the second antenna group. In a case where the first antenna group and the third antenna group are identical in position in the second direction, positions of antennas are different.
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