-
公开(公告)号：US12019145B2
公开(公告)日：2024-06-25
申请号：US17544345
申请日：2021-12-07
Inventor： Takaaki Kishigami
CPC classification number: G01S13/582 , G01S7/282 , G01S13/288
Abstract: A radar transmitter includes: a plurality of transmission antennas that transmit a transmission signal; and a transmission circuit that applies a phase rotation amount corresponding to a Doppler shift amount and a code sequence to the transmission signal to perform multiplexing transmission of the transmission signal from the plurality of transmission antennas. Each of the plurality of transmission antennas is associated with each of a plurality of combinations of the Doppler shift amount and the code sequence. Each of the plurality of combination is different at least one of the Doppler shift amount and the code sequence, and the Doppler shift amounts of those of the plurality of combinations which are associated respectively with at least two transmission antennas of the plurality of transmission antennas are the same Doppler shift amount, the at least two transmission antennas being a first sub-array antenna.
-
公开(公告)号：US11269042B2
公开(公告)日：2022-03-08
申请号：US16580032
申请日：2019-09-24
Inventor： Takaaki Kishigami
Abstract: Radar receiver calculates a first reception power in each of a predetermined number of beam directions by using a reflected wave signal in a first cell among a plurality of cells into which a region represented by at least one of a distance component and a Doppler frequency component is divided, calculates a second reception power on the basis of reception powers of reception array antennae by using the reflected wave signal in a peripheral cell of the first cell among the plurality of cells, and determines whether or not a target is present in the first cell on the basis of a comparison result between the first reception power and a first threshold value that is a value obtained by multiplying the second reception power by a first coefficient.
-
公开(公告)号：US10509103B2
公开(公告)日：2019-12-17
申请号：US16206462
申请日：2018-11-30
Inventor： Takaaki Kishigami , Tadashi Morita
Abstract: A radar device employs a configuration provided with: a receiver which, in operation, receives one or more radar transmission signals transmitted from another radar device, in an interference measurement segment in which transmission of a radar transmission signal from the radar device is stopped; A/D conversion circuitry which, in operation, converts the one or more radar transmission signals from the other radar device received by the receiver from one or more analog signals into one or more digital signals; and an interference detection circuitry which, in operation, performs a correlation calculation between each of one or more discrete samples that is the one or more digital signals and a prescribed coefficient sequence to detect one or more prescribed frequency components included in the one or more digital signals, as one or more interference signal components.
-
公开(公告)号：US12078745B2
公开(公告)日：2024-09-03
申请号：US17439682
申请日：2020-02-14
Inventor： Takaaki Kishigami , Kenta Iwasa , Hidekuni Yomo
IPC: G01S7/00 , G01S7/03 , G01S13/44 , H01Q21/06 , H04B7/0413
CPC classification number: G01S7/032 , G01S13/4463 , H01Q21/065 , H04B7/0413
Abstract: Each of the plurality of transmission antenna groups includes a plurality of transmission antennas that are disposed at second intervals in a first direction, and are disposed at fourth intervals each of which is an interval of an integral multiple of a third interval in a second direction. Each of the plurality of reception antenna groups includes a plurality of reception antennas that are disposed at fifth intervals in the first direction, and are disposed at sixth intervals each of which is an interval of an integral multiple of the third interval in the second direction. The difference between the second interval and the fifth interval is the first interval, and the difference between the fourth interval and the sixth interval is the third interval.
-
公开(公告)号：US11486994B2
公开(公告)日：2022-11-01
申请号：US16584341
申请日：2019-09-26
Inventor： Takaaki Kishigami , Ryosuke Shiozaki , Hidekuni Yomo , Kenta Iwasa
Abstract: A radar apparatus includes a plurality of transmission antennae and a radar transmitter that transmits transmission signals by using the plurality of transmission antennae. In a virtual reception array including a plurality of virtual antennae formed of a plurality of reception antennae and the plurality of transmission antennae, disposition positions of at least two of the virtual antennae are the same as each other, and, transmission intervals of the transmission signals that are sequentially transmitted from transmission antennae corresponding to the at least two virtual antennae among the plurality of transmission antennae are an equal interval.
-
公开(公告)号：US10955542B2
公开(公告)日：2021-03-23
申请号：US16169474
申请日：2018-10-24
Inventor： Takaaki Kishigami
Abstract: In a direction estimator, a horizontal array maximum likelihood estimator calculates first maximum likelihood values corresponding to NW angles in a first direction by performing a maximum likelihood estimation process on the first direction using signals received by a first virtual linear array and extracts first candidate angles of arrival of incoming waves in the first direction. A vertical array maximum likelihood estimator calculates second maximum likelihood values corresponding to the NW angles in a second direction by performing a maximum likelihood estimation process on the second direction using signals received by a second virtual linear array and extracts second candidate angles of arrival of incoming waves in the second direction. A horizontal/vertical maximum likelihood estimator estimates, using the first and second candidate angles of arrival, angles of arrival of the NW incoming waves in a two-dimensional plane extending in the first and second directions.
-
公开(公告)号：US11199619B2
公开(公告)日：2021-12-14
申请号：US16353681
申请日：2019-03-14
Inventor： Takaaki Kishigami
IPC: G01S13/42 , G01S7/41 , G01S13/931
Abstract: In a position estimation processing unit, by using the reflected wave signal of an array composed of receiving antennas arranged in a first direction among a plurality of receiving antennas, a maximum likelihood value extraction unit extracts the angle of arrival of a reflected wave signal in a first direction. An angle spread detection unit detects the angle spread in the first direction around the angle of arrival by using the reflected wave signal of the array. A target height estimation unit estimates the position of the target in the first direction by using the angle of arrival and the angle spread.
-
公开(公告)号：US09300518B2
公开(公告)日：2016-03-29
申请号：US14702235
申请日：2015-05-01
Inventor： Tadashi Morita , Takaaki Kishigami , Naoya Yosoku
CPC classification number: H04L27/3863 , G01S7/282 , G01S7/288 , G01S7/2921 , G01S13/288 , G01S2007/2886 , H04J13/0014 , H04L27/205
Abstract: A transmission system is provided with a pulse sequence generator that generates a pulse sequence including Golay code or Spano code, a π/2-BPSK modulator that applies π/2-BPSK modulation to the pulse sequence generated by the pulse sequence generator, and a phase rotator that provides phase rotation for every pulse for output of the π/2-BPSK modulator and a reception system is provided with a phase rotator that provides a phase opposite to a phase provided by the phase rotator of the transmission system and a correlator that performs correlation calculation for output of the phase rotator, based on the output of the π/2-BPSK modulator.
Abstract translation: 传输系统具有脉冲序列发生器，该脉冲序列发生器产生包括格雷码或Spano码的脉冲序列，对由脉冲序列发生器产生的脉冲序列应用＆amp; 2-BPSK调制的＆amp; 2-BPSK调制器， 以及相位旋转器，其为每个脉冲提供相位旋转以输出＆pgr / 2-BPSK调制器，并且接收系统设置有相位旋转器，其提供与由传输系统的相位旋转器提供的相位相反的相位， 基于＆pgr / 2-BPSK调制器的输出执行相位旋转器的输出的相关计算的相关器。
-
公开(公告)号：US12146978B2
公开(公告)日：2024-11-19
申请号：US17476098
申请日：2021-09-15
Inventor： Kenta Iwasa , Takaaki Kishigami , Hidekuni Yomo
Abstract: This receiving array antenna includes multiple receiving antenna rows, and each of the receiving antenna rows contains a first number of antennas; of the first number of antennas contained in the receiving antenna rows, mutually adjacent antennas are arranged separated by a first interval in a first axis direction and by a second interval in a second axis direction. The transmitting array antenna includes multiple transmitting antenna rows arranged in the second axis direction at an interval that is the first number times the second interval, each of the transmitting antenna rows contains multiple antennas, and the multiple antennas contained in the transmitting antenna rows are arranged in the same position in the second axis direction and in different positions in the first axis direction. The antennas contained in the transmitting antenna rows adjacent in the second axis direction are arranged in different positions in the first axis direction.
-
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.
