Radar device and method
According to one embodiment, a radar device includes antenna panels. The antenna panels include a first transmission panel, first reception panel, and second reception panel, or the antenna panels include a first transmission panel, second transmission panel, and first reception panel. The first transmission panel includes antennas at intervals of m times a substantially half wavelength where m is a positive integer of two or more. The first reception panel includes antennas at intervals of n times the substantially half wavelength where n is a positive integer of two or more, and m and n are coprime to each other.
1. A radar device comprising:
antenna panels, the antenna panels including a first transmission panel, a first reception panel, and a second reception panel, or including a first transmission panel, a second transmission panel, and a first reception panel;
wherein:
the first transmission panel includes first transmission antennas at intervals of m times a distance d, and a first transmission circuit coupled to the first transmission antennas;
the first reception panel includes first reception antennas at intervals of n times the distance d, and a first reception circuit coupled to the first reception antennas;
the distance d is substantially a half wavelength of an electromagnetic wave transmitted from the first transmission panel;
m is a positive integer of two or more;
n is a positive integer of two or more;
m and n are coprime to each other;
in a case where the antenna panels include the first transmission panel, the first reception panel, and the second reception panel:
the second reception panel includes second reception antennas at intervals of n times the distance d, and a second reception circuit coupled to the second reception antennas;
transmission by the first transmission circuit, reception by the first reception circuit, and reception by the second reception circuit are performed in synchronization;
the first transmission panel is on a first plane;
the first reception panel is on a second plane;
the second reception panel is on a third plane;
a first transmission surface of the first transmission panel and a first reception surface of the first reception panel are between the first plane and the second plane;
the first reception surface of the first reception panel and a second reception surface of the second reception panel are between the second plane and the third plane;
an angle between the first plane and the second plane is larger than 0 degrees and smaller than 180 degrees; and
an angle between the second plane and the third plane is larger than 0 degrees and smaller than 180 degrees; and
in a case where the antenna panels include the first transmission panel, the second transmission panel, and the first reception panel:
the second transmission panel includes second transmission antennas at intervals of m times the distance d, and a second transmission circuit coupled to the second transmission antennas;
transmission by the first transmission circuit, transmission by the second transmission circuit, and reception by the first reception circuit are performed in synchronization;
the first transmission panel is on a fourth plane;
the second transmission panel is on a fifth plane;
the first reception panel is on a sixth plane;
the first transmission surface of the first transmission panel and a second transmission surface of the second transmission panel are between the fourth plane and the fifth plane;
the second transmission surface of the second transmission panel and the first reception surface of the first reception panel are between the fifth plane and the sixth plane;
an angle between the fourth plane and the fifth plane is larger than 0 degrees and smaller than 180 degrees; and
an angle between the fifth plane and the sixth plane is larger than 0 degrees and smaller than 180 degrees.
2. The radar device according to claim 1 , wherein:
in the case where the antenna panels include the first transmission panel, the first reception panel, and the second reception panel;
the first transmission antennas are one-dimensionally arranged;
the first reception antennas are one-dimensionally arranged; and
the second reception antennas are one-dimensionally arranged; and
in the case where the antenna panels include the first transmission panel, the second transmission panel, and the first reception panel;
the first transmission antennas are one-dimensionally arranged;
the second transmission antennas are one-dimensionally arranged; and
the first reception antennas are one-dimensionally arranged.
3. The radar device according to claim 1 , wherein:
in the case where the antenna panels include the first transmission panel, the first reception panel, and the second reception panel;
the first transmission antennas are two-dimensionally arranged;
the first reception antennas are two-dimensionally arranged; and
the second reception antennas are two-dimensionally arranged; and
in the case where the antenna panels include the first transmission panel, the second transmission panel, and the first reception panel;
the first transmission antennas are two-dimensionally arranged;
the second transmission antennas are two-dimensionally arranged; and
the first reception antennas are two-dimensionally arranged.
4. The radar device according to claim 1 , wherein;
in the case where the antenna panels include the first transmission panel, the first reception panel, and the second reception panel:
the first transmission antennas are one-dimensionally arranged;
the first reception antennas are two-dimensionally arranged; and
the second reception antennas are two-dimensionally arranged; and
in the case where the antenna panels include the first transmission panel, the second transmission panel, and the first reception panel;
the first transmission antennas are one-dimensionally arranged;
the second transmission antennas are one-dimensionally arranged; and
the first reception antennas are two-dimensionally arranged.
5. The radar device according to claim 1 , wherein:
in the case where the antenna panels include the first transmission panel, the first reception panel, and the second reception panel;
the first transmission antennas are two-dimensionally arranged;
the first reception antennas are one-dimensionally arranged; and
the second reception antennas are one-dimensionally arranged; and
in the case where the antenna panels include the first transmission panel, the second transmission panel, and the first reception panel;
the first transmission antennas are two-dimensionally arranged;
the second transmission antennas are two-dimensionally arranged; and
the first reception antennas are one-dimensionally arranged.
6. The radar device according to claim 1 , further comprising:
a processor configured to generate an image of an object,
wherein:
in the case where the antenna panels include the first transmission panel, the first reception panel, and the second reception panel, the processor is operably coupled to the first reception panel and the second reception panel, and
in the case where the antenna panels include the first transmission panel, the second transmission panel, and the first reception panel, the processor is operably coupled to the first reception panel.
7. The radar device according to claim 6 , wherein, in a case where a first image generated by a reception signal of the first reception circuit and a second image generated by a reception signal of the second reception circuit include an overlapping region, the processor is configured to correct a pixel value of the overlapping region of the first image or the second image based on an average value of pixel values of the first image and an average value of pixel values of the second image.
8. A method for the radar device of claim 1 , the method comprising:
transmitting, by at least the first transmission panel, an electromagnetic wave to an object; and
receiving, by at least the first reception panel, an electromagnetic wave reflected by the object.