RADAR APPARATUS AND RADAR METHOD

• US 20180259632A1
• Filed: 03/01/2018
• Published: 09/13/2018
• Est. Priority Date: 03/07/2017
• Status: Active Grant

• Current Assignee: PANASONIC AUTOMOTIVE SYSTEMS CO., LTD. (Panasonic Holdings Corporation)
• Original Assignee: Panasonic Corporation (Panasonic Holdings Corporation)
• Inventors: KISHIGAMI, TAKAAKI
• Granted Patent: US 10,641,882 B2
• Time in Patent Office: Days
• CPC Class Codes: G01S 13/04 Systems determining presence of a target based on relative movement of target G01S13/56
• CPC Class Codes: G01S 13/106 using transmission of pulses having some particular characteristics G01S13/12, G01S13/22, G01S13/24, G01S13/26, G01S13/28 and G01S13/30 take precedence
• CPC Class Codes: G01S 13/288 phase modulated
• CPC Class Codes: G01S 13/86 Combinations of radar systems with non-radar systems, e.g. sonar, direction finder
• CPC Class Codes: G01S 7/023 Interference mitigation, e.g. reducing or avoiding non-intentional interference with other HF-transmitters, base station transmitters for mobile communication or other radar systems, e.g. using electro-magnetic interference [EMI] reduction techniques auxiliary means for detecting or identifying radar signals or the like G01S7/021; means for anti-jamming G01S7/36
• CPC Class Codes: G01S 7/0234 Avoidance by code multiplex
• CPC Class Codes: G01S 7/288 Coherent receivers
• CPC Class Codes: G01S 7/2921 based on data belonging to one radar period

Abstract

A radar apparatus includes a radar transmitter that transmits a radar signal in a predetermined transmission cycle and a radar receiver that receives a reflection wave signal being a reflection of the radar signal on a target. The radar transmitter includes a phase rotation controller that randomly varies a pattern of a phase rotation every period corresponding to a plurality of transmission cycles, the pattern being to be applied to the radar signal within a period, and a transmission phase rotator that assigns a first phase rotation to the radar signal in accordance with the pattern. The radar receiver includes a reception phase rotator that assigns a second phase rotation in a direction opposite to a direction of the first phase rotation to the reflection wave signal in accordance with the pattern.

Claims

1. A radar apparatus, comprising:

a radar transmitter which transmits a radar signal in a predetermined transmission cycle; and

a radar receiver which receives a reflection wave signal being a reflection of the radar signal on a target, wherein

the radar transmitter includes

a phase rotation controller which randomly varies a pattern of a phase rotation amount every period corresponding to a plurality of transmission cycles, the pattern being to be applied to the radar signal within a period, and

a transmission phase rotator which assigns a first phase rotation to the radar signal in accordance with the pattern, and

the radar receiver includes a reception phase rotator which assigns a second phase rotation in a direction opposite to a direction of the first phase rotation to the reflection wave signal in accordance with the pattern.

2. The radar apparatus according to claim 1, wherein a difference between phase rotation amounts in patterns different from each other is 0 or π

.

3. The radar apparatus according to claim 1, wherein the pattern is based on a pseudo random code.

4. The radar apparatus according to claim 1, wherein the phase rotation controller further assigns a phase rotation such that a predetermined phase shift within the plurality of transmission cycles is an integral multiple of 2π

.

5. The radar apparatus according to claim 4, wherein, when a complementary code is used to generate the radar signal, the phase rotation controller assigns phase rotations such that a phase shift is not made within every two transmission cycles where a pair of codes constituting the complementary code are transmitted, but a predetermined phase shift is made between two transmission cycles.

6. The radar apparatus according to claim 1, wherein patterns are different between a plurality of radar apparatuses.

7. The radar apparatus according to claim 1, wherein

the radar transmitter includes a plurality of transmission antennas, and

patterns are different between the transmission antennas.

8. A radar method, comprising:

transmitting a radar signal in a predetermined transmission cycle; and

receiving a reflection wave signal being a reflection of the radar signal on a target, wherein

a pattern of a phase rotation amount is randomly varied every period corresponding to a plurality of transmission cycles, the pattern being to be applied to the radar signal within a period,

a first phase rotation is assigned to the radar signal in accordance with the pattern, and

a second phase rotation in a direction opposite to a direction of the first phase rotation is assigned to the reflection wave signal in accordance with the pattern.